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<span class="normal"> 978</span>
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<span class="normal"> 995</span>
<span class="normal"> 996</span>
<span class="normal"> 997</span>
<span class="normal"> 998</span>
<span class="normal"> 999</span>
<span class="normal">1000</span>
<span class="normal">1001</span>
<span class="normal">1002</span>
<span class="normal">1003</span>
<span class="normal">1004</span>
<span class="normal">1005</span>
<span class="normal">1006</span>
<span class="normal">1007</span>
<span class="normal">1008</span>
<span class="normal">1009</span>
<span class="normal">1010</span>
<span class="normal">1011</span>
<span class="normal">1012</span>
<span class="normal">1013</span>
<span class="normal">1014</span>
<span class="normal">1015</span>
<span class="normal">1016</span>
<span class="normal">1017</span>
<span class="normal">1018</span>
<span class="normal">1019</span>
<span class="normal">1020</span>
<span class="normal">1021</span>
<span class="normal">1022</span>
<span class="normal">1023</span>
<span class="normal">1024</span>
<span class="normal">1025</span>
<span class="normal">1026</span>
<span class="normal">1027</span>
<span class="normal">1028</span>
<span class="normal">1029</span>
<span class="normal">1030</span>
<span class="normal">1031</span>
<span class="normal">1032</span>
<span class="normal">1033</span>
<span class="normal">1034</span>
<span class="normal">1035</span>
<span class="normal">1036</span>
<span class="normal">1037</span>
<span class="normal">1038</span>
<span class="normal">1039</span>
<span class="normal">1040</span>
<span class="normal">1041</span>
<span class="normal">1042</span>
<span class="normal">1043</span>
<span class="normal">1044</span>
<span class="normal">1045</span>
<span class="normal">1046</span>
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<span class="normal">1048</span>
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<span class="normal">1062</span>
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<span class="normal">1064</span>
<span class="normal">1065</span>
<span class="normal">1066</span>
<span class="normal">1067</span>
<span class="normal">1068</span>
<span class="normal">1069</span>
<span class="normal">1070</span>
<span class="normal">1071</span>
<span class="normal">1072</span>
<span class="normal">1073</span>
<span class="normal">1074</span>
<span class="normal">1075</span>
<span class="normal">1076</span>
<span class="normal">1077</span>
<span class="normal">1078</span>
<span class="normal">1079</span>
<span class="normal">1080</span>
<span class="normal">1081</span>
<span class="normal">1082</span>
<span class="normal">1083</span>
<span class="normal">1084</span>
<span class="normal">1085</span>
<span class="normal">1086</span>
<span class="normal">1087</span>
<span class="normal">1088</span>
<span class="normal">1089</span>
<span class="normal">1090</span>
<span class="normal">1091</span>
<span class="normal">1092</span>
<span class="normal">1093</span>
<span class="normal">1094</span>
<span class="normal">1095</span>
<span class="normal">1096</span>
<span class="normal">1097</span>
<span class="normal">1098</span>
<span class="normal">1099</span>
<span class="normal">1100</span>
<span class="normal">1101</span>
<span class="normal">1102</span>
<span class="normal">1103</span>
<span class="normal">1104</span>
<span class="normal">1105</span>
<span class="normal">1106</span>
<span class="normal">1107</span>
<span class="normal">1108</span>
<span class="normal">1109</span>
<span class="normal">1110</span>
<span class="normal">1111</span>
<span class="normal">1112</span>
<span class="normal">1113</span>
<span class="normal">1114</span>
<span class="normal">1115</span>
<span class="normal">1116</span>
<span class="normal">1117</span>
<span class="normal">1118</span>
<span class="normal">1119</span>
<span class="normal">1120</span>
<span class="normal">1121</span>
<span class="normal">1122</span>
<span class="normal">1123</span>
<span class="normal">1124</span>
<span class="normal">1125</span>
<span class="normal">1126</span>
<span class="normal">1127</span>
<span class="normal">1128</span>
<span class="normal">1129</span>
<span class="normal">1130</span>
<span class="normal">1131</span>
<span class="normal">1132</span>
<span class="normal">1133</span>
<span class="normal">1134</span>
<span class="normal">1135</span>
<span class="normal">1136</span>
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<span class="normal">1140</span>
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<span class="normal">1160</span>
<span class="normal">1161</span>
<span class="normal">1162</span>
<span class="normal">1163</span>
<span class="normal">1164</span>
<span class="normal">1165</span>
<span class="normal">1166</span>
<span class="normal">1167</span>
<span class="normal">1168</span>
<span class="normal">1169</span>
<span class="normal">1170</span>
<span class="normal">1171</span>
<span class="normal">1172</span>
<span class="normal">1173</span>
<span class="normal">1174</span>
<span class="normal">1175</span>
<span class="normal">1176</span>
<span class="normal">1177</span>
<span class="normal">1178</span>
<span class="normal">1179</span>
<span class="normal">1180</span>
<span class="normal">1181</span>
<span class="normal">1182</span>
<span class="normal">1183</span>
<span class="normal">1184</span>
<span class="normal">1185</span>
<span class="normal">1186</span>
<span class="normal">1187</span>
<span class="normal">1188</span>
<span class="normal">1189</span>
<span class="normal">1190</span>
<span class="normal">1191</span>
<span class="normal">1192</span>
<span class="normal">1193</span>
<span class="normal">1194</span>
<span class="normal">1195</span>
<span class="normal">1196</span>
<span class="normal">1197</span>
<span class="normal">1198</span>
<span class="normal">1199</span>
<span class="normal">1200</span>
<span class="normal">1201</span>
<span class="normal">1202</span>
<span class="normal">1203</span>
<span class="normal">1204</span>
<span class="normal">1205</span>
<span class="normal">1206</span>
<span class="normal">1207</span>
<span class="normal">1208</span>
<span class="normal">1209</span>
<span class="normal">1210</span>
<span class="normal">1211</span>
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<span class="normal">1221</span>
<span class="normal">1222</span>
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<span class="normal">1226</span>
<span class="normal">1227</span>
<span class="normal">1228</span>
<span class="normal">1229</span>
<span class="normal">1230</span>
<span class="normal">1231</span>
<span class="normal">1232</span>
<span class="normal">1233</span>
<span class="normal">1234</span>
<span class="normal">1235</span>
<span class="normal">1236</span>
<span class="normal">1237</span>
<span class="normal">1238</span>
<span class="normal">1239</span>
<span class="normal">1240</span>
<span class="normal">1241</span>
<span class="normal">1242</span>
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<span class="normal">1248</span>
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<span class="normal">1264</span>
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<span class="normal">1270</span>
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<span class="normal">1300</span>
<span class="normal">1301</span>
<span class="normal">1302</span>
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<span class="normal">1311</span>
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<span class="normal">1364</span>
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<span class="normal">1368</span>
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<span class="normal">1372</span>
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<span class="normal">1400</span>
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<span class="normal">1460</span>
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<span class="normal">1464</span>
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<span class="normal">1467</span>
<span class="normal">1468</span>
<span class="normal">1469</span>
<span class="normal">1470</span>
<span class="normal">1471</span>
<span class="normal">1472</span>
<span class="normal">1473</span>
<span class="normal">1474</span>
<span class="normal">1475</span>
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<span class="normal">1478</span>
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<span class="normal">1499</span>
<span class="normal">1500</span>
<span class="normal">1501</span>
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<span class="normal">1568</span>
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<span class="normal">1570</span>
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<span class="normal">1588</span>
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<span class="normal">1596</span>
<span class="normal">1597</span>
<span class="normal">1598</span>
<span class="normal">1599</span>
<span class="normal">1600</span>
<span class="normal">1601</span>
<span class="normal">1602</span>
<span class="normal">1603</span>
<span class="normal">1604</span>
<span class="normal">1605</span>
<span class="normal">1606</span>
<span class="normal">1607</span>
<span class="normal">1608</span>
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<span class="normal">1610</span>
<span class="normal">1611</span>
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<span class="normal">1615</span>
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<span class="normal">1619</span>
<span class="normal">1620</span>
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<span class="normal">1622</span>
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<span class="normal">1729</span>
<span class="normal">1730</span>
<span class="normal">1731</span>
<span class="normal">1732</span>
<span class="normal">1733</span>
<span class="normal">1734</span>
<span class="normal">1735</span>
<span class="normal">1736</span>
<span class="normal">1737</span>
<span class="normal">1738</span>
<span class="normal">1739</span>
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<span class="normal">1741</span>
<span class="normal">1742</span>
<span class="normal">1743</span>
<span class="normal">1744</span>
<span class="normal">1745</span></pre></div></td><td class="code"><div><pre><div id="l1" class="code_block"><span class="k">\section</span><span class="nb">{</span>Information about the System State<span class="nb">}</span> <span class="k">\label</span><span class="nb">{</span>State<span class="nb">}</span>
</div><div id="l2" class="code_block"><span class="c">%========================================================</span>
</div><div id="l3" class="code_block"><span class="k">\index</span><span class="nb">{</span>state of the system<span class="nb">}</span> <span class="k">\index</span><span class="nb">{</span>system, state of<span class="nb">}</span>
</div><div id="l4" class="code_block">
</div><div id="l5" class="code_block">Various aspects of the state of an instance of XSB --- information
</div><div id="l6" class="code_block">about what predicates, modules, or dynamic clauses have been loaded,
</div><div id="l7" class="code_block">their object files, along with other information can be inspected in
</div><div id="l8" class="code_block">ways similar to many Prolog systems.  However, because the atom-based
</div><div id="l9" class="code_block">module system of XSB may associate structures with particular modules,
</div><div id="l10" class="code_block">predicates are provided to inspect these elements as well.  The
</div><div id="l11" class="code_block">following descriptions of <span class="nb">{</span><span class="k">\em</span> state<span class="nb">}</span> predicates use the terms <span class="nb">{</span><span class="k">\em</span>
</div><div id="l12" class="code_block">predicate indicator<span class="nb">}</span>, <span class="nb">{</span><span class="k">\em</span> term indicator<span class="nb">}</span> and <span class="nb">{</span><span class="k">\em</span> current module<span class="nb">}</span> to
</div><div id="l13" class="code_block">mean the following:
</div><div id="l14" class="code_block"><span class="k">\index</span><span class="nb">{</span>predicate indicator<span class="nb">}</span>
</div><div id="l15" class="code_block"><span class="k">\index</span><span class="nb">{</span>term indicator<span class="nb">}</span>
</div><div id="l16" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l17" class="code_block"><span class="k">\item</span> By <span class="nb">{</span><span class="k">\em</span> predicate indicator<span class="nb">}</span> <span class="k">\index</span><span class="nb">{</span>predicate indicator<span class="nb">}</span> we mean a
</div><div id="l18" class="code_block">      <span class="nb">{</span><span class="k">\em</span> compound term<span class="nb">}</span> of the form <span class="nb">{</span><span class="k">\tt</span> M:F/A<span class="nb">}</span> or simply <span class="nb">{</span><span class="k">\tt</span> F/A<span class="nb">}</span>.
</div><div id="l19" class="code_block">      When the predicate indicator is fully instantiated, <span class="nb">{</span><span class="k">\tt</span> M<span class="nb">}</span> and <span class="nb">{</span><span class="k">\tt</span> F<span class="nb">}</span>
</div><div id="l20" class="code_block">      are atoms representing the <span class="nb">{</span><span class="k">\em</span> module name<span class="nb">}</span> and the <span class="nb">{</span><span class="k">\em</span> functor<span class="nb">}</span> 
</div><div id="l21" class="code_block">      of the predicate respectively and <span class="nb">{</span><span class="k">\tt</span> A<span class="nb">}</span> is a non negative integer 
</div><div id="l22" class="code_block">      representing its <span class="nb">{</span><span class="k">\em</span> arity<span class="nb">}</span>.
</div><div id="l23" class="code_block">
</div><div id="l24" class="code_block">      Example: <span class="nb">{</span><span class="k">\tt</span> usermod:append/3<span class="nb">}</span>
</div><div id="l25" class="code_block"><span class="k">\item</span> By <span class="nb">{</span><span class="k">\em</span> term indicator<span class="nb">}</span> <span class="k">\index</span><span class="nb">{</span>term indicator<span class="nb">}</span> we mean a predicate or
</div><div id="l26" class="code_block">      function symbol of arity N followed by a sequence of N variables
</div><div id="l27" class="code_block">      (enclosed in parentheses if N is greater than zero).  A term indicator
</div><div id="l28" class="code_block">      may optionally be prefixed by the module name, thus it can be of the
</div><div id="l29" class="code_block">      form <span class="nb">{</span><span class="k">\tt</span> M:Term<span class="nb">}</span>.
</div><div id="l30" class="code_block">
</div><div id="l31" class="code_block">      Example: <span class="nb">{</span><span class="k">\tt</span> usermod:append(<span class="k">\_</span>,<span class="k">\_</span>,<span class="k">\_</span>)<span class="nb">}</span>
</div><div id="l32" class="code_block"><span class="k">\item</span> A module <span class="nb">{</span><span class="k">\tt</span> M<span class="nb">}</span> becomes a <span class="nb">{</span><span class="k">\em</span> current (i.e. ``known&#39;&#39;) module<span class="nb">}</span> as
</div><div id="l33" class="code_block">      soon as it is loaded in the system or when another module that is
</div><div id="l34" class="code_block">      loaded in the system imports some predicates from module <span class="nb">{</span><span class="k">\tt</span> M<span class="nb">}</span>.
</div><div id="l35" class="code_block">
</div><div id="l36" class="code_block">      Note that due to the dynamic loading of XSB, a module can be
</div><div id="l37" class="code_block">      current even if it has not been loaded, and that some predicates
</div><div id="l38" class="code_block">      of that module may not be defined. In fact, a module can be
</div><div id="l39" class="code_block">      current even if it does not exist.  This situation occurs when a
</div><div id="l40" class="code_block">      predicate is improperly imported from a non-existent module.
</div><div id="l41" class="code_block">      Despite this, a module can never lose the property of being <span class="nb">{</span><span class="k">\em</span>
</div><div id="l42" class="code_block">        current<span class="nb">}</span>.
</div><div id="l43" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l44" class="code_block">
</div><div id="l45" class="code_block"><span class="k">\begin</span><span class="nb">{</span>description<span class="nb">}</span>
</div><div id="l46" class="code_block">
</div><div id="l47" class="code_block"><span class="k">\isoitem</span><span class="nb">{</span>current<span class="k">\_input</span>(?Stream)<span class="nb">}{</span>current<span class="k">\_input</span>/1<span class="nb">}</span>
</div><div id="l48" class="code_block">    Succeeds iff stream <span class="nb">{</span><span class="k">\tt</span> Stream<span class="nb">}</span> is the current input stream, or 
</div><div id="l49" class="code_block">    procedurally unifies <span class="nb">{</span><span class="k">\tt</span> Stream<span class="nb">}</span> with the current input stream.
</div><div id="l50" class="code_block">
</div><div id="l51" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Error Cases<span class="nb">}</span>
</div><div id="l52" class="code_block"><span class="k">\bi</span>
</div><div id="l53" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Stream<span class="nb">}</span> is neither a variable nor a stream identifier
</div><div id="l54" class="code_block"><span class="k">\bi</span>
</div><div id="l55" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> domain<span class="k">\_error</span>(stream<span class="k">\_or\_variable</span>,Stream))<span class="nb">}</span>
</div><div id="l56" class="code_block"><span class="k">\ei</span>
</div><div id="l57" class="code_block"><span class="k">\ei</span>
</div><div id="l58" class="code_block"><span class="c">%</span>
</div><div id="l59" class="code_block"><span class="c">%\compatibility </span>
</div><div id="l60" class="code_block"><span class="c">%</span>
</div><div id="l61" class="code_block"><span class="c">%In XSB {\tt current\_input/1} does not throw an error if {\tt Stream}</span>
</div><div id="l62" class="code_block"><span class="c">%is not a current input stream, but quietly fails instead.</span>
</div><div id="l63" class="code_block">
</div><div id="l64" class="code_block"><span class="k">\isoitem</span><span class="nb">{</span>current<span class="k">\_output</span>(?Stream)<span class="nb">}{</span>ISO<span class="nb">}{</span>current<span class="k">\_output</span>/1<span class="nb">}</span>
</div><div id="l65" class="code_block"><span class="c">%</span>
</div><div id="l66" class="code_block">    Succeeds iff stream <span class="nb">{</span><span class="k">\tt</span> Stream<span class="nb">}</span> is the current output stream, or 
</div><div id="l67" class="code_block">    procedurally unifies <span class="nb">{</span><span class="k">\tt</span> Stream<span class="nb">}</span> with the current output stream.
</div><div id="l68" class="code_block">
</div><div id="l69" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Error Cases<span class="nb">}</span>
</div><div id="l70" class="code_block"><span class="k">\bi</span>
</div><div id="l71" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Stream<span class="nb">}</span> is neither a variable nor a stream identifier
</div><div id="l72" class="code_block"><span class="k">\bi</span>
</div><div id="l73" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> domain<span class="k">\_error</span>(stream<span class="k">\_or\_variable</span>,Stream))<span class="nb">}</span>
</div><div id="l74" class="code_block"><span class="k">\ei</span>
</div><div id="l75" class="code_block"><span class="k">\ei</span>
</div><div id="l76" class="code_block"><span class="c">%</span>
</div><div id="l77" class="code_block"><span class="k">\compatibility</span> 
</div><div id="l78" class="code_block"><span class="c">%</span>
</div><div id="l79" class="code_block">In XSB <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_input</span>/1<span class="nb">}</span> does not throw an error if <span class="nb">{</span><span class="k">\tt</span> Stream<span class="nb">}</span>
</div><div id="l80" class="code_block">is not a current input stream, but quietly fails instead.
</div><div id="l81" class="code_block">
</div><div id="l82" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog-commons<span class="nb">}</span>
</div><div id="l83" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags<span class="nb">}</span>
</div><div id="l84" class="code_block"><span class="k">\label</span><span class="nb">{</span>prolog-flags<span class="nb">}</span>
</div><div id="l85" class="code_block"><span class="k">\isoitem</span><span class="nb">{</span>current<span class="k">\_prolog\_flag</span>(?Flag<span class="k">\_Name</span>, ?Value)<span class="nb">}{</span>current<span class="k">\_prolog\_flag</span>/2<span class="nb">}</span>
</div><div id="l86" class="code_block"><span class="c">%</span>
</div><div id="l87" class="code_block"><span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_prolog\_flag</span>/2<span class="nb">}</span> allows the user to examine both dynamic
</div><div id="l88" class="code_block">aspects of XSB along with certain non-changeable ISO flags and
</div><div id="l89" class="code_block">non-changeable Prolog-commons flags.  Calls to <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l90" class="code_block">  current<span class="k">\_prolog\_flag</span>/2<span class="nb">}</span> will unify against ISO, Prolog-commons, and
</div><div id="l91" class="code_block">XSB-specific flags.
</div><div id="l92" class="code_block">
</div><div id="l93" class="code_block">ISO and Prolog-commons flags are as follows:
</div><div id="l94" class="code_block">
</div><div id="l95" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> bounded<span class="nb">}}</span>
</div><div id="l96" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> min<span class="k">\_integer</span><span class="nb">}}</span>
</div><div id="l97" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_integer</span><span class="nb">}}</span>
</div><div id="l98" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> integer<span class="k">\_rounding\_function</span><span class="nb">}}</span>
</div><div id="l99" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> debug<span class="nb">}}</span>
</div><div id="l100" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> unknown<span class="nb">}}</span>
</div><div id="l101" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> double<span class="k">\_quotes</span><span class="nb">}}</span>
</div><div id="l102" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> dialect<span class="nb">}}</span>
</div><div id="l103" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> version<span class="k">\_data</span><span class="nb">}}</span>
</div><div id="l104" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l105" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> bounded<span class="nb">}</span> Indicates whether integers in XSB are bounded.
</div><div id="l106" class="code_block">  This flag always has the value <span class="nb">{</span><span class="k">\tt</span> true<span class="nb">}</span>
</div><div id="l107" class="code_block"><span class="c">%</span>
</div><div id="l108" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> min<span class="k">\_integer</span>, max<span class="k">\_integer</span><span class="nb">}</span> The minimum integer available in the current
</div><div id="l109" class="code_block">  XSB configuration (differs between 32- and 64-bits).
</div><div id="l110" class="code_block"><span class="c">%</span>
</div><div id="l111" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_arity</span><span class="nb">}</span> Indicates the maximum arity of terms in XSB.
</div><div id="l112" class="code_block">  This flag always has the value <span class="nb">{</span><span class="k">\tt</span> 255<span class="nb">}</span>
</div><div id="l113" class="code_block"><span class="c">%</span>
</div><div id="l114" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> integer<span class="k">\_rounding\_function</span><span class="nb">}</span> This flag always has the value
</div><div id="l115" class="code_block">  <span class="nb">{</span><span class="k">\tt</span> toward<span class="k">\_zero</span><span class="nb">}</span>
</div><div id="l116" class="code_block"><span class="c">%</span>
</div><div id="l117" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> debug<span class="nb">}</span> Indicates whether trace or debugging is turned <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l118" class="code_block">  on<span class="nb">}</span> or <span class="nb">{</span><span class="k">\tt</span> off<span class="nb">}</span>
</div><div id="l119" class="code_block"><span class="c">%</span>
</div><div id="l120" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> unknown<span class="nb">}</span> Indicates the behavior taken when calling an
</div><div id="l121" class="code_block">  unknown predicate.  Values can be set to <span class="nb">{</span><span class="k">\tt</span> fail<span class="nb">}</span>, <span class="nb">{</span><span class="k">\tt</span> warning<span class="nb">}</span>,
</div><div id="l122" class="code_block">  or <span class="nb">{</span><span class="k">\tt</span> error<span class="nb">}</span>, indincating that calls to unknown predicates fail,
</div><div id="l123" class="code_block">  produce a warning message to <span class="nb">{</span><span class="k">\tt</span> user<span class="k">\_warning</span><span class="nb">}</span> or throw an
</div><div id="l124" class="code_block">  existence error.  The default setting is <span class="nb">{</span><span class="k">\tt</span> error<span class="nb">}</span>.
</div><div id="l125" class="code_block"><span class="c">%</span>
</div><div id="l126" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> double<span class="k">\_quotes</span><span class="nb">}</span> Indicates that double-quoted terms in XSB
</div><div id="l127" class="code_block">  represent lists of character codes.  Value is <span class="nb">{</span><span class="k">\tt</span> codes<span class="nb">}</span>
</div><div id="l128" class="code_block"><span class="c">%</span>
</div><div id="l129" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> dialect<span class="nb">}</span> indicates the implementation of Prolog that is
</div><div id="l130" class="code_block">  running.  Using this flag, applications intended to run on more than
</div><div id="l131" class="code_block">  one Prolog can take actions that conditional on the executing
</div><div id="l132" class="code_block">  Prolog.  The value is <span class="nb">{</span><span class="k">\tt</span> xsb<span class="nb">}</span>.
</div><div id="l133" class="code_block">
</div><div id="l134" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> version<span class="k">\_data</span><span class="nb">}</span> indicates the version of XSB that is
</div><div id="l135" class="code_block">  running.  Using this flag, applications intended to run on more than
</div><div id="l136" class="code_block">  one Prolog can take actions that conditional on the executing
</div><div id="l137" class="code_block">  Prolog.  The value is <span class="nb">{</span><span class="k">\tt</span> xsb<span class="nb">}</span>.
</div><div id="l138" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l139" class="code_block">
</div><div id="l140" class="code_block"><span class="k">\compatibility</span> The ISO flags <span class="nb">{</span><span class="k">\tt</span> char<span class="k">\_conversion</span><span class="nb">}</span> is not available
</div><div id="l141" class="code_block">-- XSB does not use character conversion.  XSB reads double quoted
</div><div id="l142" class="code_block">strings as lists of character codes, so that the value of the flag
</div><div id="l143" class="code_block"><span class="nb">{</span><span class="k">\tt</span> double<span class="k">\_quotes</span><span class="nb">}</span> is always <span class="nb">{</span><span class="k">\tt</span> codes<span class="nb">}</span>, and this flag is not
</div><div id="l144" class="code_block">settable.
</div><div id="l145" class="code_block">
</div><div id="l146" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> backtrace<span class="k">\_on\_error</span><span class="nb">}}</span>
</div><div id="l147" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> dcg<span class="k">\_style</span><span class="nb">}}</span>
</div><div id="l148" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> heap<span class="k">\_garbage\_collection</span><span class="nb">}}</span>
</div><div id="l149" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> heap<span class="k">\_margin</span><span class="nb">}}</span>
</div><div id="l150" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> clause<span class="k">\_garbage\_collection</span><span class="nb">}}</span>
</div><div id="l151" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> atom<span class="k">\_garbage\_collection</span><span class="nb">}}</span>
</div><div id="l152" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> table<span class="k">\_gc\_action</span><span class="nb">}}</span>
</div><div id="l153" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> goal<span class="nb">}}</span>
</div><div id="l154" class="code_block">Non-standard flag names may be specific to XSB or may be common to XSB
</div><div id="l155" class="code_block">and certain other Prolog.  These flag names are:
</div><div id="l156" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l157" class="code_block"><span class="k">\index</span><span class="nb">{</span>streams!STDERR<span class="nb">}</span>
</div><div id="l158" class="code_block"><span class="c">%</span>
</div><div id="l159" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> backtrace<span class="k">\_on\_error</span><span class="nb">}</span> <span class="nb">{</span><span class="k">\tt</span> on<span class="nb">}</span> iff system-handled errors
</div><div id="l160" class="code_block">automatically print out the trace of the execution stack where the
</div><div id="l161" class="code_block">error arose, <span class="nb">{</span><span class="k">\tt</span> off<span class="nb">}</span> otherwise. Default is <span class="nb">{</span><span class="k">\tt</span> on<span class="nb">}</span>.  In the
</div><div id="l162" class="code_block">multi-threaded engine, this flag is thread-specific and controls
</div><div id="l163" class="code_block">whether the backtrace for a current execution will be printed to <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l164" class="code_block">  STDERR<span class="nb">}</span>.
</div><div id="l165" class="code_block"><span class="c">%\</span>
</div><div id="l166" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> dcg<span class="k">\_style</span><span class="nb">}</span>  the DCG style currently used; <span class="nb">{</span><span class="k">\tt</span> xsb<span class="nb">}</span> or <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l167" class="code_block">  standard<span class="nb">}</span> (standard is used in Quintus, SICSTUS, etc.).  See
</div><div id="l168" class="code_block">Section~<span class="k">\ref</span><span class="nb">{</span>sec-dcg-differences<span class="nb">}</span> for more details. Default is <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l169" class="code_block">  xsb<span class="nb">}</span>. This flag affects all threads in the process.
</div><div id="l170" class="code_block"><span class="c">%</span>
</div><div id="l171" class="code_block"><span class="k">\index</span><span class="nb">{</span>garbage collection<span class="nb">}</span>
</div><div id="l172" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> heap<span class="k">\_garbage\_collection</span><span class="nb">}</span>  <span class="nb">{</span><span class="k">\tt</span> indirection<span class="nb">}</span>, <span class="nb">{</span><span class="k">\tt</span> none<span class="nb">}</span>, <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l173" class="code_block">  sliding<span class="nb">}</span>, or <span class="nb">{</span><span class="k">\tt</span> copying<span class="nb">}</span> depending on the heap garbage collection
</div><div id="l174" class="code_block">strategy that is currently being employed (see also
</div><div id="l175" class="code_block">Section~<span class="k">\ref</span><span class="nb">{</span>sec:EmuOptions<span class="nb">}</span>).  Default is <span class="nb">{</span><span class="k">\tt</span> indirection<span class="nb">}</span>.  This
</div><div id="l176" class="code_block">flag is private to each thread.  
</div><div id="l177" class="code_block"><span class="c">%</span>
</div><div id="l178" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> heap<span class="k">\_margin</span><span class="nb">}</span> Specifies the size <span class="nb">{</span><span class="k">\em</span> in bytes<span class="nb">}</span> of the
</div><div id="l179" class="code_block">  margin used to determine whether to perform heap garbage collection
</div><div id="l180" class="code_block">  or reallocation of the environment stack.  The default is 8192 (8K)
</div><div id="l181" class="code_block">  bytes for 32-bit platforms 16384 (16K) for 64-bit platforms.
</div><div id="l182" class="code_block">  Setting this field to a large value (e.g. in the megabyte range) can
</div><div id="l183" class="code_block">  cause XSB to be more aggressive in terms of expanding heap and local
</div><div id="l184" class="code_block">  stack and to do fewer heap garbage collections than with the default
</div><div id="l185" class="code_block">  value.  However <span class="nb">{</span><span class="k">\tt</span> heap<span class="k">\_margin</span><span class="nb">}</span> should not be set <span class="nb">{</span><span class="k">\em</span> lower<span class="nb">}</span>
</div><div id="l186" class="code_block">  than its default, as this may prevent XSB from properly creating
</div><div id="l187" class="code_block">  large terms on the heap.
</div><div id="l188" class="code_block">
</div><div id="l189" class="code_block"><span class="c">%</span>
</div><div id="l190" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> clause<span class="k">\_garbage\_collection</span><span class="nb">}</span>  <span class="nb">{</span><span class="k">\tt</span> on<span class="nb">}</span> if garbage collection for
</div><div id="l191" class="code_block">retracted clauses is allowed, and off otherwise. Default is <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l192" class="code_block">  on<span class="nb">}</span>.  This flag is private to each thread.  
</div><div id="l193" class="code_block"><span class="c">%</span>
</div><div id="l194" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> atom<span class="k">\_garbage\_collection</span><span class="nb">}</span>  <span class="nb">{</span><span class="k">\tt</span> on<span class="nb">}</span> if garbage collection for
</div><div id="l195" class="code_block">atomic constants is allowed, and off otherwise. Default is <span class="nb">{</span><span class="k">\tt</span> on<span class="nb">}</span>.
</div><div id="l196" class="code_block">This flag is global for all threads (currently, string garbage
</div><div id="l197" class="code_block">collection will only be invoked if there is a single active thread.)
</div><div id="l198" class="code_block">
</div><div id="l199" class="code_block"><span class="c">%</span>
</div><div id="l200" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> table<span class="k">\_gc\_action</span><span class="nb">}</span> The setting <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l201" class="code_block">  abolish<span class="k">\_tables\_transitively</span><span class="nb">}</span> causes predicates or subgoals that
</div><div id="l202" class="code_block">  depend on a conditional answer of an abolished table to be abolished
</div><div id="l203" class="code_block">  automatically; the setting <span class="nb">{</span><span class="k">\tt</span> abolish<span class="k">\_tables\_singly</span><span class="nb">}</span> not does
</div><div id="l204" class="code_block">  not cause this action.  The distinction is important, since if table
</div><div id="l205" class="code_block">  <span class="s">$</span><span class="nb">T_</span><span class="m">1</span><span class="s">$</span> depends on table <span class="s">$</span><span class="nb">T_</span><span class="m">2</span><span class="s">$</span>, and <span class="s">$</span><span class="nb">T_</span><span class="m">2</span><span class="s">$</span> is abolished but <span class="s">$</span><span class="nb">T_</span><span class="m">1</span><span class="s">$</span> is
</div><div id="l206" class="code_block">  not, then predicates that introspect the dependencies of <span class="s">$</span><span class="nb">T_</span><span class="m">1</span><span class="s">$</span> could
</div><div id="l207" class="code_block">  cause memory violations (e.g., <span class="nb">{</span><span class="k">\tt</span> get<span class="k">\_residual</span>/2<span class="nb">}</span>).  Default is
</div><div id="l208" class="code_block">  <span class="nb">{</span><span class="k">\tt</span> abolish<span class="k">\_tables\_transitively</span><span class="nb">}</span>.  This flag affects all threads
</div><div id="l209" class="code_block">  in the process.
</div><div id="l210" class="code_block"><span class="c">%</span>
</div><div id="l211" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> goal<span class="nb">}</span>  the goal passed to XSB on command line with the `-e&#39;
</div><div id="l212" class="code_block">switch; `<span class="nb">{</span><span class="k">\tt</span> true.<span class="nb">}</span>&#39; if nothing is passed.  This flag may be
</div><div id="l213" class="code_block">examined, but not set. 
</div><div id="l214" class="code_block"><span class="c">%</span>
</div><div id="l215" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> tracing<span class="nb">}}</span>
</div><div id="l216" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> warning<span class="k">\_action</span><span class="nb">}}</span>
</div><div id="l217" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> write<span class="k">\_depth</span><span class="nb">}}</span>
</div><div id="l218" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> write<span class="k">\_attributes</span><span class="nb">}}</span>
</div><div id="l219" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> tracing<span class="nb">}</span>  <span class="nb">{</span><span class="k">\tt</span> on<span class="nb">}</span> iff trace mode is on; <span class="nb">{</span><span class="k">\tt</span> off<span class="nb">}</span>
</div><div id="l220" class="code_block">otherwise. This flag affects all threads in the process. 
</div><div id="l221" class="code_block"><span class="c">%</span>
</div><div id="l222" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> write<span class="k">\_depth</span><span class="nb">}</span>  The depth to which a term is written by <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l223" class="code_block">  write<span class="nb">}</span>-like predicates.  Default is 64.  This flag affects all
</div><div id="l224" class="code_block">threads in the process.  
</div><div id="l225" class="code_block">
</div><div id="l226" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> warning<span class="k">\_action</span><span class="nb">}</span> The action to take on warnings: the
</div><div id="l227" class="code_block">  default value <span class="nb">{</span><span class="k">\tt</span> print<span class="k">\_warning</span><span class="nb">}</span> prints a warning message to the
</div><div id="l228" class="code_block">  XSB <span class="nb">{</span><span class="k">\tt</span> STDWARN<span class="nb">}</span> stream when <span class="nb">{</span><span class="k">\tt</span> warning/1<span class="nb">}</span> is called; <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l229" class="code_block">    silent<span class="k">\_warning</span><span class="nb">}</span> silently succeeds when <span class="nb">{</span><span class="k">\tt</span> warning/1<span class="nb">}</span> is called;
</div><div id="l230" class="code_block">  and <span class="nb">{</span><span class="k">\tt</span> error<span class="k">\_warning</span>/1<span class="nb">}</span> throws a miscellaneous exception.
</div><div id="l231" class="code_block">
</div><div id="l232" class="code_block"><span class="k">\index</span><span class="nb">{</span>attributed variables<span class="nb">}</span>
</div><div id="l233" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> write<span class="k">\_attributes</span><span class="nb">}</span> Determines the action to take by <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l234" class="code_block">  write/1<span class="nb">}</span> when it writes an attributed variable.  By default <span class="nb">{</span><span class="k">\em</span>
</div><div id="l235" class="code_block">  write/1<span class="nb">}</span> portrays attributed variables using module-specific
</div><div id="l236" class="code_block">  routines (cf. Volume 2 of this manual) as <span class="s">$</span><span class="nb">Variable </span><span class="nv">\{</span><span class="nb"> Module :</span>
</div><div id="l237" class="code_block"><span class="nb">  PA</span><span class="nv">\_</span><span class="nb">Output</span><span class="nv">\}</span><span class="s">$</span> where <span class="s">$</span><span class="nb">PA</span><span class="nv">\_</span><span class="nb">Output</span><span class="s">$</span> is the output of the <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l238" class="code_block">    portray<span class="k">\_attrubutes</span>/2<span class="nb">}</span> clause for <span class="s">$</span><span class="nb">Module</span><span class="s">$</span>.  However the value
</div><div id="l239" class="code_block">  <span class="nb">{</span><span class="k">\tt</span> ignore<span class="nb">}</span> causes an attributed variable to be written simply as a
</div><div id="l240" class="code_block">  variable; and <span class="nb">{</span><span class="k">\tt</span> dots<span class="nb">}</span> causes <span class="s">$</span><span class="nb">Variable </span><span class="nv">\{</span><span class="nb"> &lt;module</span><span class="nv">\_</span><span class="nb">name&gt; : ...</span><span class="nv">\}</span><span class="s">$</span>
</div><div id="l241" class="code_block">  to be written.  Finally, the value <span class="nb">{</span><span class="k">\tt</span> write<span class="nb">}</span> causes a variables
</div><div id="l242" class="code_block">  attribute to be written as a term~<span class="k">\footnote</span><span class="nb">{</span>When writing an
</div><div id="l243" class="code_block">    attribute, any attributed variables in the attribute itself are
</div><div id="l244" class="code_block">    written just as variables with their attributes ignored.<span class="nb">}</span>.  The
</div><div id="l245" class="code_block">  default behavior is set to the value <span class="nb">{</span><span class="k">\tt</span> portray<span class="nb">}</span>.
</div><div id="l246" class="code_block">
</div><div id="l247" class="code_block"><span class="k">\index</span><span class="nb">{</span>term depth<span class="nb">}</span>
</div><div id="l248" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_table\_subgoal\_action</span><span class="nb">}}</span>
</div><div id="l249" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_answer\_term\_action</span><span class="nb">}}</span>
</div><div id="l250" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_answer\_list\_action</span><span class="nb">}}</span>
</div><div id="l251" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_table\_subgoal\_depth</span><span class="nb">}}</span>
</div><div id="l252" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_answer\_term\_depth</span><span class="nb">}}</span>
</div><div id="l253" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_answer\_list\_depth</span><span class="nb">}}</span>
</div><div id="l254" class="code_block"><span class="k">\index</span><span class="nb">{</span>termination!subgoal abstraction<span class="nb">}</span>
</div><div id="l255" class="code_block"><span class="k">\index</span><span class="nb">{</span>termination!radial restraint<span class="nb">}</span>
</div><div id="l256" class="code_block"><span class="c">%</span>
</div><div id="l257" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_table\_subgoal\_action</span><span class="nb">}</span> The action to take when a tabled
</div><div id="l258" class="code_block">  subgoal of maximum depth is encountered.  To understand the use of
</div><div id="l259" class="code_block">  this flag, consider that if a predicate such as
</div><div id="l260" class="code_block"><span class="k">\begin</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l261" class="code_block">p(X):- p(f(X)).
</div><div id="l262" class="code_block"><span class="k">\end</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l263" class="code_block">  is tabled, it can (semantically) create subgoals of infinite depth.
</div><div id="l264" class="code_block">  When the maximum subgoal depth is reached, XSB can either throw a
</div><div id="l265" class="code_block">  miscellaneous error (the default action); or XSB can fail -- an
</div><div id="l266" class="code_block">  action that may be valid for certain programs.  The action is set to
</div><div id="l267" class="code_block">  fail by the value <span class="nb">{</span><span class="k">\tt</span> failure<span class="nb">}</span> while the action of throwing an
</div><div id="l268" class="code_block">  error can be (re-)set using the value <span class="nb">{</span><span class="k">\tt</span> error<span class="nb">}</span>.
</div><div id="l269" class="code_block">
</div><div id="l270" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_table\_subgoal\_depth</span><span class="nb">}</span> The maximum depth of a subgoal
</div><div id="l271" class="code_block">  argument that can be added to a table: when the depth is reached, an
</div><div id="l272" class="code_block">  action is taken as indicated for the previous flag.  The default
</div><div id="l273" class="code_block">  value is <span class="nb">{</span><span class="k">\tt</span> maximum<span class="k">\_integer</span><span class="nb">}</span>.
</div><div id="l274" class="code_block">
</div><div id="l275" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_table\_answer\_action</span><span class="nb">}</span> The action to take when a tabled
</div><div id="l276" class="code_block">  answer of maximum depth is encountered.  To understand the use of
</div><div id="l277" class="code_block">  this flag, consider the program fragment:
</div><div id="l278" class="code_block"><span class="k">\begin</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l279" class="code_block">:- table p/1.
</div><div id="l280" class="code_block">p(f(X)):- p(X).          p(a).
</div><div id="l281" class="code_block"><span class="k">\end</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l282" class="code_block">  is tabled, the model for the goal <span class="nb">{</span><span class="k">\tt</span> ?- p(X)<span class="nb">}</span> is infinite, so that
</div><div id="l283" class="code_block">  this program will not terminate.  When the maximum answer depth is
</div><div id="l284" class="code_block">  reached, XSB can either 
</div><div id="l285" class="code_block"><span class="k">\begin</span><span class="nb">{</span>enumerate<span class="nb">}</span>
</div><div id="l286" class="code_block"><span class="k">\item</span> Throw a miscellaneous error, set using the value <span class="nb">{</span><span class="k">\tt</span> error<span class="nb">}</span>.
</div><div id="l287" class="code_block">  This is the default action.
</div><div id="l288" class="code_block"><span class="c">%</span>
</div><div id="l289" class="code_block"><span class="k">\item</span> Apply bounded rationality by abstracting the answer with a truth
</div><div id="l290" class="code_block">  value of <span class="nb">{</span><span class="k">\em</span> undefined<span class="nb">}</span>; settable using the value <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l291" class="code_block">    bounded<span class="k">\_rationality</span><span class="nb">}</span>.
</div><div id="l292" class="code_block"><span class="c">%</span>
</div><div id="l293" class="code_block"><span class="k">\item</span> Issue a warning, settable using the value <span class="nb">{</span><span class="k">\tt</span> warning<span class="nb">}</span>.
</div><div id="l294" class="code_block"><span class="c">%</span>
</div><div id="l295" class="code_block"><span class="k">\item</span> Fail the answer addition, an action that may be valid for
</div><div id="l296" class="code_block">  certian programs, settable using the value <span class="nb">{</span><span class="k">\tt</span> fail<span class="nb">}</span>.
</div><div id="l297" class="code_block"><span class="c">%</span>
</div><div id="l298" class="code_block"><span class="k">\end</span><span class="nb">{</span>enumerate<span class="nb">}</span>
</div><div id="l299" class="code_block"><span class="c">%</span>
</div><div id="l300" class="code_block"><span class="nb">{</span><span class="k">\bf</span> <span class="nb">{</span><span class="k">\em</span> Note that this flag affects only structures that are not lists (since
</div><div id="l301" class="code_block">large lists are more common than other large structures).<span class="nb">}}</span>
</div><div id="l302" class="code_block">
</div><div id="l303" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_table\_answer\_depth</span><span class="nb">}</span> The maximum depth of an answer
</div><div id="l304" class="code_block">  argument that can be added to a table: when the depth is reached, an
</div><div id="l305" class="code_block">  action is taken as indicated for the previous flag.  The default
</div><div id="l306" class="code_block">  value is <span class="nb">{</span><span class="k">\tt</span> maximum<span class="k">\_integer</span><span class="nb">}</span>.
</div><div id="l307" class="code_block">
</div><div id="l308" class="code_block"><span class="nb">{</span><span class="k">\bf</span>  <span class="nb">{</span><span class="k">\em</span> Note that this flag affects only structures that are not lists
</div><div id="l309" class="code_block">    (since large lists are more common than other large structures).
</div><div id="l310" class="code_block">  <span class="nb">}}</span>
</div><div id="l311" class="code_block">
</div><div id="l312" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_table\_answer\_list\_action</span><span class="nb">}</span> The action to take when a
</div><div id="l313" class="code_block">  tabled answer of maximum list depth is encountered.  To understand
</div><div id="l314" class="code_block">  the use of this flag, consider the program fragment:
</div><div id="l315" class="code_block"><span class="k">\begin</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l316" class="code_block">:- table l/1.
</div><div id="l317" class="code_block">l([a|X]):- l(X).          l([a]).
</div><div id="l318" class="code_block"><span class="k">\end</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l319" class="code_block">  is tabled, the model for the goal <span class="nb">{</span><span class="k">\tt</span> ?- l(X)<span class="nb">}</span> is infinite, so that
</div><div id="l320" class="code_block">  this program will not terminate.  When the maximum answer list depth
</div><div id="l321" class="code_block">  is reached, XSB can either throw a miscellaneous error (the default
</div><div id="l322" class="code_block">  action); emit a warning; or XSB can fail -- an action that may be
</div><div id="l323" class="code_block">  valid for certain programs~<span class="k">\footnote</span><span class="nb">{</span>Failure in this case can be
</div><div id="l324" class="code_block">    seen as an implicit form of answer abstraction.<span class="nb">}</span>.  The action is
</div><div id="l325" class="code_block">  set to fail by the value <span class="nb">{</span><span class="k">\tt</span> failure<span class="nb">}</span> while the action of throwing
</div><div id="l326" class="code_block">  an error can be (re-)set using the value <span class="nb">{</span><span class="k">\tt</span> error<span class="nb">}</span>, and the action
</div><div id="l327" class="code_block">  of warning is set by the value <span class="nb">{</span><span class="k">\tt</span> warning<span class="nb">}</span>.
</div><div id="l328" class="code_block">
</div><div id="l329" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_table\_answer\_list\_depth</span><span class="nb">}</span> The maximum list depth of
</div><div id="l330" class="code_block">  an answer argument that can be added to a table: when the depth is
</div><div id="l331" class="code_block">  reached, an action is taken as indicated for the previous flag.  The
</div><div id="l332" class="code_block">  default value is <span class="nb">{</span><span class="k">\tt</span> maximum<span class="k">\_integer</span><span class="nb">}</span>.
</div><div id="l333" class="code_block">
</div><div id="l334" class="code_block">  <span class="nb">{</span><span class="k">\em</span> Note that this flag affects only structures that are lists
</div><div id="l335" class="code_block">    (since large lists are more common than other large structures).
</div><div id="l336" class="code_block">  <span class="nb">}</span>
</div><div id="l337" class="code_block">
</div><div id="l338" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_memory</span><span class="nb">}}</span>
</div><div id="l339" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_memory</span><span class="nb">}</span> The maximum amount of memory that an XSB
</div><div id="l340" class="code_block">  thread (in the single-threaded engine) or all XSB threads (in the
</div><div id="l341" class="code_block">  multi threaded engine) can use for their combined execution stacks,
</div><div id="l342" class="code_block">  program space, tables, or any other purpose.  If a query exceeds
</div><div id="l343" class="code_block">  this amount, XSB will abort the query with a resource exception and
</div><div id="l344" class="code_block">  then try to reclaim space used by the query.  As with other flags,
</div><div id="l345" class="code_block">  this flag can be set during an XSB session.
</div><div id="l346" class="code_block">
</div><div id="l347" class="code_block">  The maximum amount can be set in two ways.  If given a floating
</div><div id="l348" class="code_block">  point number <span class="s">$</span><span class="nb">F</span><span class="s">$</span>, the maximum will be set to <span class="s">$</span><span class="nb">F</span><span class="s">$</span> times the total
</div><div id="l349" class="code_block">  amount of RAM for the machine on which XSB is executing.  If given
</div><div id="l350" class="code_block">  an integer <span class="s">$</span><span class="nb">I</span><span class="s">$</span>, the maximum will be set to <span class="s">$</span><span class="nb">I</span><span class="s">$</span> kilobytes.  The value
</div><div id="l351" class="code_block">  of 0 effectively disables the flag, allowing XSB to allocate as much
</div><div id="l352" class="code_block">  memory as the underlying OS will grant.  The default value is 0, so
</div><div id="l353" class="code_block">  that the flag is disabled by default.
</div><div id="l354" class="code_block">
</div><div id="l355" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> unify<span class="k">\_with\_occurs\_check</span><span class="nb">}}</span>
</div><div id="l356" class="code_block"><span class="k">\index</span><span class="nb">{</span>occurs check<span class="nb">}</span>
</div><div id="l357" class="code_block"><span class="k">\index</span><span class="nb">{</span>terms!cyclic<span class="nb">}</span>
</div><div id="l358" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> unify<span class="k">\_with\_occurs\_check</span><span class="nb">}</span> If set to <span class="nb">{</span><span class="k">\tt</span> on<span class="nb">}</span>, perform all
</div><div id="l359" class="code_block">  unification using an occurs check, which makes unification
</div><div id="l360" class="code_block">  mathematically correct, but computationally complex.  Without the occurs
</div><div id="l361" class="code_block">  check, the unification 
</div><div id="l362" class="code_block"><span class="sb">\[</span>
</div><div id="l363" class="code_block"><span class="nb">   X </span><span class="o">=</span><span class="nb"> f</span><span class="o">(</span><span class="nb">X</span><span class="o">)</span>
</div><div id="l364" class="code_block"><span class="s">\]</span>
</div><div id="l365" class="code_block">  will produce a cyclic term <span class="nb">{</span><span class="k">\tt</span> X = f(f(f(f(...))))<span class="nb">}</span>; with the
</div><div id="l366" class="code_block">  occurs check this unification will fail.  Setting the flag to <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l367" class="code_block">    on<span class="nb">}</span> may slow down programs, perhaps drastically, and may be
</div><div id="l368" class="code_block">  incompatible with some constraint libraries such as CHR.  An
</div><div id="l369" class="code_block">  alternate to this flag is the ISO predicate <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l370" class="code_block">    unify<span class="k">\_with\_occurs\_check</span>/2<span class="nb">}</span>: see Section~<span class="k">\ref</span><span class="nb">{</span>sec:cyclic<span class="nb">}</span> for
</div><div id="l371" class="code_block">    further discussion.  The default for this flag is <span class="nb">{</span><span class="k">\tt</span> off<span class="nb">}</span>.
</div><div id="l372" class="code_block"><span class="c">%</span>
</div><div id="l373" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> character<span class="k">\_set</span><span class="nb">}}</span>
</div><div id="l374" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> character<span class="k">\_set</span><span class="nb">}}</span>
</div><div id="l375" class="code_block"><span class="k">\index</span><span class="nb">{</span>character sets<span class="nb">}</span> 
</div><div id="l376" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> character<span class="k">\_set</span><span class="nb">}</span> If set to <span class="nb">{</span><span class="k">\tt</span> utf<span class="k">\_</span>8<span class="nb">}</span>, interprets
</div><div id="l377" class="code_block">input/output byte sequences as UTF-8 encodings of unicode code points;
</div><div id="l378" class="code_block">if set to <span class="nb">{</span><span class="k">\tt</span> cp1252<span class="nb">}</span> then interprets bytes using the Windows Code
</div><div id="l379" class="code_block">Page 1252; if set to <span class="nb">{</span><span class="k">\tt</span> latin<span class="k">\_</span>1<span class="nb">}</span>, then input/output bytes are
</div><div id="l380" class="code_block">interpreted as directly representing unicode code points.  Default for
</div><div id="l381" class="code_block">UNIX-style systems is <span class="nb">{</span><span class="k">\tt</span> utf<span class="k">\_</span>8<span class="nb">}</span> and for Windows-style systems is
</div><div id="l382" class="code_block"><span class="nb">{</span><span class="k">\tt</span> cp1252<span class="nb">}</span>, but the flag (and character sets) may be changed at any
</div><div id="l383" class="code_block">time.  (See section ``Character Sets in XSB&#39;&#39; in XSB User Manual
</div><div id="l384" class="code_block">Volume 2 for more details.)
</div><div id="l385" class="code_block"><span class="c">%</span>
</div><div id="l386" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> errors<span class="k">\_with\_position</span><span class="nb">}}</span>
</div><div id="l387" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> errors<span class="k">\_with\_position</span><span class="nb">}}</span>
</div><div id="l388" class="code_block"><span class="k">\index</span><span class="nb">{</span>errors with position<span class="nb">}</span> 
</div><div id="l389" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> errors<span class="k">\_with\_position</span><span class="nb">}</span> If set to on, then the Prolog
</div><div id="l390" class="code_block"><span class="nb">{</span><span class="k">\tt</span> read<span class="nb">}</span> predicates, when they encounter a syntax error in the term
</div><div id="l391" class="code_block">being read, will throw a syntax error which contains a pair
</div><div id="l392" class="code_block"><span class="k">\texttt</span><span class="nb">{</span>ErrorMessage-ErrorPosition<span class="nb">}</span>.  <span class="nb">{</span><span class="k">\tt</span> ErrorPosition<span class="nb">}</span> is an integer
</div><div id="l393" class="code_block">indicating the position in the file at which the syntax error was
</div><div id="l394" class="code_block">detected. If set to off, then the read predicates will simply throw
</div><div id="l395" class="code_block">the syntax error message.
</div><div id="l396" class="code_block">
</div><div id="l397" class="code_block"><span class="k">\index</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>explain<span class="k">\_u\_val</span>/3<span class="nb">}}</span>
</div><div id="l398" class="code_block"><span class="k">\index</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>explain<span class="k">\_u\_val</span>/6<span class="nb">}}</span>
</div><div id="l399" class="code_block"><span class="k">\index</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>get<span class="k">\_residual\_sccs</span>/3<span class="nb">}}</span>
</div><div id="l400" class="code_block"><span class="k">\index</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>get<span class="k">\_residual\_sccs</span>/5<span class="nb">}}</span>
</div><div id="l401" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> exception<span class="k">\_action</span><span class="nb">}}</span>
</div><div id="l402" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> exception<span class="k">\_action</span><span class="nb">}</span> If set to <span class="nb">{</span><span class="k">\tt</span> iso<span class="nb">}</span> then ISO-style
</div><div id="l403" class="code_block">  exceptions will be thrown whenever an error condition arises.
</div><div id="l404" class="code_block">  However, if <span class="nb">{</span><span class="k">\tt</span> exception<span class="k">\_action</span><span class="nb">}</span> is set to <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l405" class="code_block">    undefined<span class="k">\_truth\_value</span><span class="nb">}</span> then certain goals will succeed with an
</div><div id="l406" class="code_block">  undefined truth value rather than throwing an error.  When this
</div><div id="l407" class="code_block">  occurs, a literal is added to the delay list of the current
</div><div id="l408" class="code_block">  evaluation.  Later, it can be determined if an undefined answer
</div><div id="l409" class="code_block">  depends on an exceptional condition through <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l410" class="code_block">    explain<span class="k">\_u\_val</span>/[3.6]<span class="nb">}</span>, <span class="nb">{</span><span class="k">\tt</span> get<span class="k">\_residual\_sccs</span>/[3,5]<span class="nb">}</span> or via a
</div><div id="l411" class="code_block">  justification system that depends on these predicates.  The default
</div><div id="l412" class="code_block">  for this flag is <span class="nb">{</span><span class="k">\tt</span> iso<span class="nb">}</span>
</div><div id="l413" class="code_block"><span class="c">%</span>
</div><div id="l414" class="code_block"><span class="k">\index</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>get<span class="k">\_scc\_dumpfile</span>/0<span class="nb">}}</span>
</div><div id="l415" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> exception<span class="k">\_pre\_action</span><span class="nb">}}</span>
</div><div id="l416" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> exception<span class="k">\_pre\_action</span><span class="nb">}</span> If set to <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l417" class="code_block">  print<span class="k">\_incomplete\_tables</span><span class="nb">}</span>, then the predicate <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l418" class="code_block">  print<span class="k">\_incomplete\_tables</span>/0<span class="nb">}</span> is called <span class="nb">{</span><span class="k">\em</span> before<span class="nb">}</span> throwing an
</div><div id="l419" class="code_block">  exception.  The execution of <span class="nb">{</span><span class="k">\tt</span> print<span class="k">\_incomplete\_tables</span>/0<span class="nb">}</span>
</div><div id="l420" class="code_block">  causes the stack of incomplete tables to be printed to a temporary
</div><div id="l421" class="code_block">  file in <span class="nb">{</span><span class="k">\tt</span> <span class="k">\$</span>XSBDIR/etc<span class="nb">}</span>.  The file can be obtained via the
</div><div id="l422" class="code_block">  predicate <span class="nb">{</span><span class="k">\tt</span> get<span class="k">\_scc\_dumpfile</span>/1<span class="nb">}</span>; information in the file can be
</div><div id="l423" class="code_block">  used to help understand the context in which the exception arose.
</div><div id="l424" class="code_block">  The file will be created only if an exception is thrown over at
</div><div id="l425" class="code_block">  least one incomplete table.  The default for this flag is <span class="nb">{</span><span class="k">\tt</span> off<span class="nb">}</span>.
</div><div id="l426" class="code_block"><span class="c">%</span>
</div><div id="l427" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_tab\_usage</span><span class="nb">}}</span>
</div><div id="l428" class="code_block"><span class="k">\index</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>statistics/1<span class="nb">}}</span>
</div><div id="l429" class="code_block"><span class="k">\index</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>statistics/0<span class="nb">}}</span>
</div><div id="l430" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_tab\_usage</span><span class="nb">}</span> If set to <span class="nb">{</span><span class="k">\tt</span> on<span class="nb">}</span>, maintains the maximal
</div><div id="l431" class="code_block">  table usage (in bytes) for display in <span class="nb">{</span><span class="k">\tt</span> statistics/[0,1]<span class="nb">}</span>.  This
</div><div id="l432" class="code_block">  information can be useful if a program performs various types of
</div><div id="l433" class="code_block">  table abolishes.  Setting this flag to <span class="nb">{</span><span class="k">\tt</span> on<span class="nb">}</span> may slightly slow
</div><div id="l434" class="code_block">  down computation.  Defailt is <span class="nb">{</span><span class="k">\tt</span> off<span class="nb">}</span>.
</div><div id="l435" class="code_block">
</div><div id="l436" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l437" class="code_block">
</div><div id="l438" class="code_block">The following flags affect only the multi-threaded engine.
</div><div id="l439" class="code_block">
</div><div id="l440" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> exception<span class="k">\_pre\_action</span><span class="nb">}}</span>
</div><div id="l441" class="code_block"><span class="k">\index</span><span class="nb">{</span>tabling!and exceptions<span class="nb">}</span>
</div><div id="l442" class="code_block"><span class="k">\index</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>print<span class="k">\_incomplete\_tables</span>/0<span class="nb">}}</span>
</div><div id="l443" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_glsize</span><span class="nb">}}</span>
</div><div id="l444" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_tcpsize</span><span class="nb">}}</span>
</div><div id="l445" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_complsize</span><span class="nb">}}</span>
</div><div id="l446" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_pdlsize</span><span class="nb">}}</span>
</div><div id="l447" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l448" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_glsize</span><span class="nb">}</span> In the multi-threaded engine, the initial
</div><div id="l449" class="code_block">  size, in kbytes, of the global and local stack area of a newly
</div><div id="l450" class="code_block">  created thread if no such option is explicitly passed.  By default
</div><div id="l451" class="code_block">  this is 768 (or 1536 for 64-bit configurations), or whatever was
</div><div id="l452" class="code_block">  passed in if the command-line option <span class="nb">{</span><span class="k">\tt</span> -m<span class="nb">}</span> was used, but that
</div><div id="l453" class="code_block">  value may be modified at any time by resetting the flag.  This flag
</div><div id="l454" class="code_block">  affects a thread created by any thread in the process.
</div><div id="l455" class="code_block">
</div><div id="l456" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_tcpsize</span><span class="nb">}</span> In the multi-threaded engine, the initial
</div><div id="l457" class="code_block">  size, in kbytes, of the trail and choice point area of a newly
</div><div id="l458" class="code_block">  created thread if no such option is explicitly passed.  By default
</div><div id="l459" class="code_block">  this is 768 (or 1536 for 64-bit configurations), or whatever was
</div><div id="l460" class="code_block">  passed in if the command-line option <span class="nb">{</span><span class="k">\tt</span> -c<span class="nb">}</span> was used, but that
</div><div id="l461" class="code_block">  value may be modified at any time by resetting the flag.  This flag
</div><div id="l462" class="code_block">  affects a thread created by any thread in the process.
</div><div id="l463" class="code_block">
</div><div id="l464" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_complsize</span><span class="nb">}</span> In the multi-threaded engine, the
</div><div id="l465" class="code_block">  initial size, in kbytes, of the completion stack area of a newly
</div><div id="l466" class="code_block">  created thread if no such option is explicitly passed.  By default
</div><div id="l467" class="code_block">  this is 64 (or 128 for 64-bit configurations), or whatever was
</div><div id="l468" class="code_block">  passed in if the command-line option <span class="nb">{</span><span class="k">\tt</span> -0<span class="nb">}</span> was used, but that
</div><div id="l469" class="code_block">  value may be modified at any time by resetting the flag.  This flag
</div><div id="l470" class="code_block">  affects a thread created by any thread in the process.
</div><div id="l471" class="code_block">
</div><div id="l472" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_pdlsize</span><span class="nb">}</span> In the multi-threaded engine, the initial
</div><div id="l473" class="code_block">  size, in kbytes, of the unification stack area of a newly created
</div><div id="l474" class="code_block">  thread if no such option is explicitly passed.  By default this is
</div><div id="l475" class="code_block">  64 (or 128 for 64-bit configurations), or whatever was passed in if
</div><div id="l476" class="code_block">  the command-line option <span class="nb">{</span><span class="k">\tt</span> -m<span class="nb">}</span> was used, but that value may be
</div><div id="l477" class="code_block">  modified at any time by resetting the flag.  This flag affects a
</div><div id="l478" class="code_block">  thread created by any thread in the process.
</div><div id="l479" class="code_block">
</div><div id="l480" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_detached</span><span class="nb">}}</span>
</div><div id="l481" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_threads</span><span class="nb">}}</span>
</div><div id="l482" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_queue\_size</span><span class="nb">}}</span>
</div><div id="l483" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> shared<span class="k">\_predicates</span><span class="nb">}}</span>
</div><div id="l484" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> thread<span class="k">\_detached</span><span class="nb">}</span> In the multi-threaded engine, this
</div><div id="l485" class="code_block">  specifies whether threads are to be created as detached or joinable
</div><div id="l486" class="code_block">  if no explicit option is passed.  A value of <span class="nb">{</span><span class="k">\tt</span> true<span class="nb">}</span> indicates
</div><div id="l487" class="code_block">  that threads are to be created as detached, and <span class="nb">{</span><span class="k">\tt</span> false<span class="nb">}</span> as
</div><div id="l488" class="code_block">  joinable.  If this flag is not set, its default is <span class="nb">{</span><span class="k">\tt</span> false<span class="nb">}</span>.
</div><div id="l489" class="code_block">
</div><div id="l490" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_threads</span><span class="nb">}</span> In the multi-threaded engine, the maximum
</div><div id="l491" class="code_block">  number of valid threads.  By default this is 1024 and this value may
</div><div id="l492" class="code_block">  not be reset at runtime, but it may be set by the command-line
</div><div id="l493" class="code_block">  option <span class="nb">{</span><span class="k">\tt</span> --max<span class="k">\_threads</span><span class="nb">}</span>.  This option is settable only by a
</div><div id="l494" class="code_block">  command-line argument, and has no effect in the single-threaded
</div><div id="l495" class="code_block">  engine.
</div><div id="l496" class="code_block">
</div><div id="l497" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> max<span class="k">\_queue\_size</span><span class="nb">}</span> In the multi-threaded engine, the default
</div><div id="l498" class="code_block">  maximum number of terms a message queue contains before writes to
</div><div id="l499" class="code_block">  the message queue block.  By default this is 1000.  If set to 0,
</div><div id="l500" class="code_block">  queues by default will be unbounded.  This option has no effect in
</div><div id="l501" class="code_block">  the single-threaded engine.
</div><div id="l502" class="code_block">
</div><div id="l503" class="code_block"><span class="k">\index</span><span class="nb">{</span>shared<span class="k">\_predicates</span><span class="nb">}</span>
</div><div id="l504" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> shared<span class="k">\_predicates</span><span class="nb">}</span> In the multi-threaded engine, indicates
</div><div id="l505" class="code_block">  whether predicates are considered thread-shared by default -- that
</div><div id="l506" class="code_block">  is, whether tables or dynamic predicates are shared among threads.
</div><div id="l507" class="code_block">  By default this is false, and predicates are considered
</div><div id="l508" class="code_block">  thread-private by default.  This option is settable only by a
</div><div id="l509" class="code_block">  command-line argument, and has no effect in the
</div><div id="l510" class="code_block">  single-threaded engine.
</div><div id="l511" class="code_block">
</div><div id="l512" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l513" class="code_block">    
</div><div id="l514" class="code_block">Note that the non-standard flags are used only for dynamic XSB
</div><div id="l515" class="code_block">settings, <span class="nb">{</span><span class="k">\it</span> i.e.<span class="nb">}</span>, settings that might change between sessions (via
</div><div id="l516" class="code_block">command line arguments) or within the same session (via modifiable
</div><div id="l517" class="code_block">flags).  For static configuration information, the predicate <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l518" class="code_block">  xsb<span class="k">\_configuration</span>/2<span class="nb">}</span> is used. <span class="nb">{</span>xsb<span class="k">\_configuration</span>/2<span class="nb">}</span>.
</div><div id="l519" class="code_block">
</div><div id="l520" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Error Cases<span class="nb">}</span>
</div><div id="l521" class="code_block"><span class="k">\bi</span>
</div><div id="l522" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Flag<span class="k">\_Name</span><span class="nb">}</span> is neither a variable nor an atom.
</div><div id="l523" class="code_block"><span class="k">\bi</span>
</div><div id="l524" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> domain<span class="k">\_error</span>(atom<span class="k">\_or\_variable</span>,Flag<span class="k">\_Name</span>)<span class="nb">}</span>
</div><div id="l525" class="code_block"><span class="k">\ei</span>
</div><div id="l526" class="code_block"><span class="k">\ei</span>
</div><div id="l527" class="code_block">
</div><div id="l528" class="code_block"><span class="k">\isoitem</span><span class="nb">{</span>set<span class="k">\_prolog\_flag</span>(?Flag<span class="k">\_Name</span>, ?Value)<span class="nb">}{</span>set<span class="k">\_prolog\_flag</span>/2<span class="nb">}</span>
</div><div id="l529" class="code_block"><span class="c">%</span>
</div><div id="l530" class="code_block"><span class="nb">{</span><span class="k">\tt</span> set<span class="k">\_prolog\_flag</span>/2<span class="nb">}</span> allows the user to change settable prolog
</div><div id="l531" class="code_block">flags.  Currently the only settable ISO flag is the <span class="nb">{</span><span class="k">\tt</span> unknown<span class="nb">}</span>
</div><div id="l532" class="code_block">flag.  Setting the flag <span class="nb">{</span><span class="k">\tt</span> unknown<span class="nb">}</span> to <span class="nb">{</span><span class="k">\tt</span> fail<span class="nb">}</span> results in calls
</div><div id="l533" class="code_block">to undefined predicates to quietly fail.  Setting it to <span class="nb">{</span><span class="k">\tt</span> warning<span class="nb">}</span>
</div><div id="l534" class="code_block">causes calls to undefined predicates to generate a warning (to <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l535" class="code_block">  STDWARN<span class="nb">}</span>) and then fail.  Setting it to <span class="nb">{</span><span class="k">\tt</span> error<span class="nb">}</span> (the default)
</div><div id="l536" class="code_block">causes calls to undefined predicates to throw an existence error.
</div><div id="l537" class="code_block">
</div><div id="l538" class="code_block">Dynamic XSB settings can also be changed, as described in <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l539" class="code_block">  current<span class="k">\_prolog\_flag</span>/2<span class="nb">}</span>.
</div><div id="l540" class="code_block">
</div><div id="l541" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Error Cases<span class="nb">}</span>
</div><div id="l542" class="code_block"><span class="k">\bi</span>
</div><div id="l543" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Flag<span class="k">\_Name</span><span class="nb">}</span> or <span class="nb">{</span><span class="k">\tt</span> Value<span class="nb">}</span> is a variable.
</div><div id="l544" class="code_block"><span class="k">\bi</span>
</div><div id="l545" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> instantiation<span class="k">\_error</span><span class="nb">}</span>
</div><div id="l546" class="code_block"><span class="k">\ei</span>
</div><div id="l547" class="code_block"><span class="c">%</span>
</div><div id="l548" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Flag<span class="k">\_Name</span><span class="nb">}</span> is not the name of a recognized Prolog flag.
</div><div id="l549" class="code_block"><span class="k">\bi</span>
</div><div id="l550" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> domain<span class="k">\_error</span>(prolog<span class="k">\_flag</span>,Flag<span class="k">\_Name</span>)<span class="nb">}</span>
</div><div id="l551" class="code_block"><span class="k">\ei</span>
</div><div id="l552" class="code_block"><span class="k">\ei</span>
</div><div id="l553" class="code_block">
</div><div id="l554" class="code_block"><span class="k">\isoitem</span><span class="nb">{</span>current<span class="k">\_predicate</span>(?Predicate<span class="k">\_Indicator</span>)<span class="nb">}{</span>current<span class="k">\_predicate</span>/1<span class="nb">}</span>
</div><div id="l555" class="code_block"><span class="c">%</span>
</div><div id="l556" class="code_block"><span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_predicate</span>/1<span class="nb">}</span> can be used to backtrack through indicators
</div><div id="l557" class="code_block">for loaded user or system predicates.  If <span class="nb">{</span><span class="k">\tt</span> Predicate<span class="k">\_Indicator</span><span class="nb">}</span>
</div><div id="l558" class="code_block">unifies with <span class="nb">{</span><span class="k">\tt</span> Module:F/A<span class="nb">}</span> all loaded predicates unifying with this
</div><div id="l559" class="code_block">indicator is returned.  If <span class="nb">{</span><span class="k">\tt</span> Predicate<span class="k">\_indicator</span><span class="nb">}</span> is <span class="nb">{</span><span class="k">\tt</span> F/A<span class="nb">}</span>,
</div><div id="l560" class="code_block"><span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_predicate</span>/1<span class="nb">}</span> behaves as if it were called with the form
</div><div id="l561" class="code_block"><span class="nb">{</span><span class="k">\tt</span> usermod:F/A<span class="nb">}</span>.  Unlike <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_functor</span>/1<span class="nb">}</span> <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l562" class="code_block">current<span class="k">\_predicate</span>/1<span class="nb">}</span> does not return indicators for predicates that
</div><div id="l563" class="code_block">have been imported but not actually loaded into code space.  For more
</div><div id="l564" class="code_block">detailed analysis of predicate properties, the predicate <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l565" class="code_block">predicate<span class="k">\_property</span>/2<span class="nb">}</span> can be used.
</div><div id="l566" class="code_block">
</div><div id="l567" class="code_block">As an example to backtrack through all of the predicates defined and loaded in
</div><div id="l568" class="code_block">module <span class="nb">{</span><span class="k">\tt</span> blah<span class="nb">}</span>, regardless of whether <span class="nb">{</span><span class="k">\tt</span> blah<span class="nb">}</span> is a system or a
</div><div id="l569" class="code_block">user defined module, use:
</div><div id="l570" class="code_block">
</div><div id="l571" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l572" class="code_block">    <span class="k">\&gt;</span> <span class="k">\&gt;</span>	| ?- current<span class="k">\_predicate</span>(blah:Predicate).
</div><div id="l573" class="code_block">    <span class="nb">}</span>
</div><div id="l574" class="code_block">
</div><div id="l575" class="code_block">    In this case <span class="nb">{</span><span class="k">\tt</span> Predicate<span class="nb">}</span> will have the form: <span class="nb">{</span><span class="k">\tt</span> Functor/Arity<span class="nb">}</span>.
</div><div id="l576" class="code_block">
</div><div id="l577" class="code_block">    To backtrack through all predicates defined and loaded in any current 
</div><div id="l578" class="code_block">    module, use:
</div><div id="l579" class="code_block">
</div><div id="l580" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l581" class="code_block">    <span class="k">\&gt;</span> <span class="k">\&gt;</span>	| ?- current<span class="k">\_predicate</span>(Module:Functor/Arity).
</div><div id="l582" class="code_block">    <span class="nb">}</span>
</div><div id="l583" class="code_block">
</div><div id="l584" class="code_block">    This succeeds once for every predicate that is loaded in XSB&#39;s
</div><div id="l585" class="code_block">    database.
</div><div id="l586" class="code_block">
</div><div id="l587" class="code_block">    To find the predicates having arity 3 that are loaded in <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l588" class="code_block">    usermod<span class="nb">}</span>, use:
</div><div id="l589" class="code_block">
</div><div id="l590" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l591" class="code_block">    <span class="k">\&gt;</span> <span class="k">\&gt;</span>	| ?- current<span class="k">\_predicate</span>(usermod:Functor/3).
</div><div id="l592" class="code_block">    <span class="nb">}</span>
</div><div id="l593" class="code_block">
</div><div id="l594" class="code_block">    while to find all predicates loaded in the global modules of the system
</div><div id="l595" class="code_block">    regardless of their arity, use:
</div><div id="l596" class="code_block">
</div><div id="l597" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l598" class="code_block">    <span class="k">\&gt;</span> <span class="k">\&gt;</span>	| ?- current<span class="k">\_predicate</span>(usermod:Predicate). <span class="k">\\</span>
</div><div id="l599" class="code_block">    <span class="nb">}</span>
</div><div id="l600" class="code_block"><span class="c">%</span>
</div><div id="l601" class="code_block">
</div><div id="l602" class="code_block"><span class="k">\noindent</span>
</div><div id="l603" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Error Cases<span class="nb">}</span>
</div><div id="l604" class="code_block"><span class="k">\bi</span>
</div><div id="l605" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Predicate<span class="k">\_indicator</span><span class="nb">}</span> is neither a variable nor a predicate indicator
</div><div id="l606" class="code_block"><span class="k">\bi</span>
</div><div id="l607" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> type<span class="k">\_error</span>(predicate<span class="k">\_indicator</span>,Predicate<span class="k">\_indicator</span>))<span class="nb">}</span>
</div><div id="l608" class="code_block"><span class="k">\ei</span>
</div><div id="l609" class="code_block"><span class="k">\ei</span>
</div><div id="l610" class="code_block"><span class="c">%</span>
</div><div id="l611" class="code_block"><span class="k">\compatibility</span>
</div><div id="l612" class="code_block"><span class="c">%</span>
</div><div id="l613" class="code_block">In XSB, <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_predicate</span><span class="nb">}</span> will backtrack through system
</div><div id="l614" class="code_block">predicates as well as user predicates.
</div><div id="l615" class="code_block">
</div><div id="l616" class="code_block">
</div><div id="l617" class="code_block"><span class="c">%-----------------------------------------------------------------------------------------------</span>
</div><div id="l618" class="code_block"><span class="k">\comment</span><span class="nb">{</span>
</div><div id="l619" class="code_block"><span class="c">%TLS: I don&#39;t see that this gives us anything useful over</span>
</div><div id="l620" class="code_block"><span class="c">%current_predicate/1, so why confuse the user?</span>
</div><div id="l621" class="code_block"><span class="c">%\ouritem{current\_predicate(?Name, ?Term\_Indicator)}</span>
</div><div id="l622" class="code_block"><span class="c">%{current\_predicate/2}}</span>
</div><div id="l623" class="code_block"><span class="c">%    Succeeds iff {\tt Term\_Indicator} is the most general term </span>
</div><div id="l624" class="code_block"><span class="c">%    corresponding to one of the predicates having functor {\tt Name} that are </span>
</div><div id="l625" class="code_block"><span class="c">%    defined and loaded in a particular module in the database. </span>
</div><div id="l626" class="code_block"><span class="c">%    (The module can be either system or user defined).</span>
</div><div id="l627" class="code_block"><span class="c">%    Or procedurally, {\tt current\_predicate/2}</span>
</div><div id="l628" class="code_block"><span class="c">%    unifies {\tt Name} with the name of a loaded predicate, and </span>
</div><div id="l629" class="code_block"><span class="c">%    {\tt Term\_Indicator} with the most general term corresponding to that</span>
</div><div id="l630" class="code_block"><span class="c">%   predicate.  The flavours of this predicate are analogous to those of </span>
</div><div id="l631" class="code_block"><span class="c">%    {\tt current\_predicate/1} and behave according to whether </span>
</div><div id="l632" class="code_block"><span class="c">%    {\tt Term\_Indicator} has one of the following two forms:</span>
</div><div id="l633" class="code_block"><span class="c">%    \begin{enumerate}</span>
</div><div id="l634" class="code_block"><span class="c">%    \item{\tt Module:Term.}</span>
</div><div id="l635" class="code_block"><span class="c">%    \item{\tt Term} (module is assumed to be usermod).</span>
</div><div id="l636" class="code_block"><span class="c">%    \end{enumerate}</span>
</div><div id="l637" class="code_block"><span class="c">%    If {\tt Term\_Indicator} is uninstantiated, then this predicate succeeds</span>
</div><div id="l638" class="code_block"><span class="c">%    only for {\tt usermod}. Like {\tt current\_predicate/1} only </span>
</div><div id="l639" class="code_block"><span class="c">%    predicates that have a property in the following set:</span>
</div><div id="l640" class="code_block"><span class="c">%    \begin{center}</span>
</div><div id="l641" class="code_block"><span class="c">%    {\tt $\{$ loaded, dynamic, foreign $\}$ }</span>
</div><div id="l642" class="code_block"><span class="c">%    \end{center}</span>
</div><div id="l643" class="code_block"><span class="c">%    (see {\tt predicate\_property/2} below) are reported.</span>
</div><div id="l644" class="code_block"><span class="c">%</span>
</div><div id="l645" class="code_block"><span class="c">%    For example, if predicates {\tt foo/1} and {\tt foo/3} are defined and</span>
</div><div id="l646" class="code_block"><span class="c">%    loaded into module {\tt blah}, the following query will return:</span>
</div><div id="l647" class="code_block"><span class="c">%</span>
</div><div id="l648" class="code_block"><span class="c">%    \stuff{</span>
</div><div id="l649" class="code_block"><span class="c">%    \&gt;	\&gt;	| ?- current\_predicate(foo, blah:Term).\\</span>
</div><div id="l650" class="code_block"><span class="c">%    \&gt;  \&gt;						\\</span>
</div><div id="l651" class="code_block"><span class="c">%    \&gt;	\&gt;      Term = foo(\_638788,\_638792,\_638796);	\\</span>
</div><div id="l652" class="code_block"><span class="c">%    \&gt;  \&gt;						\\</span>
</div><div id="l653" class="code_block"><span class="c">%    \&gt;	\&gt;	Term = foo(\_638788);			\\</span>
</div><div id="l654" class="code_block"><span class="c">%    \&gt;  \&gt;						\\</span>
</div><div id="l655" class="code_block"><span class="c">%    \&gt;	\&gt;	no</span>
</div><div id="l656" class="code_block"><span class="c">%    }</span>
</div><div id="l657" class="code_block"><span class="c">%</span>
</div><div id="l658" class="code_block"><span class="c">%    If a module is specified, {\tt current\_predicate/2} succeeds only for</span>
</div><div id="l659" class="code_block"><span class="c">%    those predicates which are defined and loaded in that module. Unless </span>
</div><div id="l660" class="code_block"><span class="c">%    the module is one of the global modules, {\tt current\_predicate/2} fails</span>
</div><div id="l661" class="code_block"><span class="c">%    for those predicates which are imported into that module.</span>
</div><div id="l662" class="code_block"><span class="c">%</span>
</div><div id="l663" class="code_block"><span class="c">%    On the other hand, the goal:</span>
</div><div id="l664" class="code_block"><span class="c">%</span>
</div><div id="l665" class="code_block"><span class="c">%    \stuff{</span>
</div><div id="l666" class="code_block"><span class="c">%    \&gt;	\&gt;	| ?- current\_predicate(Name, Term).</span>
</div><div id="l667" class="code_block"><span class="c">%    }</span>
</div><div id="l668" class="code_block"><span class="c">%</span>
</div><div id="l669" class="code_block"><span class="c">%    can be used to backtrack through every predicate that is loaded in the</span>
</div><div id="l670" class="code_block"><span class="c">%    global modules of \ourprolog&#39;s database.</span>
</div><div id="l671" class="code_block"><span class="c">%</span>
</div><div id="l672" class="code_block"><span class="c">%    Note that the order of term generation is undetermined. Once again, </span>
</div><div id="l673" class="code_block"><span class="c">%    there are no error conditions associated with this predicate; if its</span>
</div><div id="l674" class="code_block"><span class="c">%    argument is not what it should be, the predicate simply fails.</span>
</div><div id="l675" class="code_block"><span class="c">%</span>
</div><div id="l676" class="code_block"><span class="c">%\ouritem{current\_functor(?Name, ?Term\_Indicator)}</span>
</div><div id="l677" class="code_block"><span class="c">%{current\_functor/2}}</span>
</div><div id="l678" class="code_block"><span class="c">%    Succeeds iff {\tt Term\_Indicator} is the most general term </span>
</div><div id="l679" class="code_block"><span class="c">%    corresponding to one of the currently known terms having {\tt Name} </span>
</div><div id="l680" class="code_block"><span class="c">%    as their functor appearing in a current module.  (Both system and user </span>
</div><div id="l681" class="code_block"><span class="c">%    defined modules are checked).  Or procedurally, </span>
</div><div id="l682" class="code_block"><span class="c">%    {\tt current\_functor/2} unifies {\tt Name} with the name of a functor </span>
</div><div id="l683" class="code_block"><span class="c">%    known to the database, and {\tt Term\_Indicator} with the most </span>
</div><div id="l684" class="code_block"><span class="c">%    general term corresponding to that functor. The flavours of this predicate </span>
</div><div id="l685" class="code_block"><span class="c">%    are analogous to the ones of {\tt current\_functor/1} according to </span>
</div><div id="l686" class="code_block"><span class="c">%    whether {\tt Term\_Indicator} has one of the following two forms:</span>
</div><div id="l687" class="code_block"><span class="c">%    \begin{enumerate}</span>
</div><div id="l688" class="code_block"><span class="c">%    \item{\tt Module:Term.}</span>
</div><div id="l689" class="code_block"><span class="c">%    \item{\tt Term} (for global modules).</span>
</div><div id="l690" class="code_block"><span class="c">%    \end{enumerate}</span>
</div><div id="l691" class="code_block"><span class="c">%    If {\tt Term\_Indicator} is uninstantiated, then this predicate succeeds</span>
</div><div id="l692" class="code_block"><span class="c">%    only for global modules.  </span>
</div><div id="l693" class="code_block"><span class="c">%    As in {\tt current\_functor/1} even unloaded predicates are reported</span>
</div><div id="l694" class="code_block"><span class="c">%    (if they have been imported and are are known to the database).</span>
</div><div id="l695" class="code_block"><span class="c">%</span>
</div><div id="l696" class="code_block"><span class="c">%    For example, if a predicate {\tt foo/2} and and a function symbol </span>
</div><div id="l697" class="code_block"><span class="c">%    {\tt foo/1} are defined into module {\tt blah}, the following query </span>
</div><div id="l698" class="code_block"><span class="c">%    will return:</span>
</div><div id="l699" class="code_block"><span class="c">%</span>
</div><div id="l700" class="code_block"><span class="c">%    \stuff{</span>
</div><div id="l701" class="code_block"><span class="c">%    \&gt;	\&gt;	| ?- current\_functor(foo, blah:Term).	\\</span>
</div><div id="l702" class="code_block"><span class="c">%    \&gt;  \&gt;						\\</span>
</div><div id="l703" class="code_block"><span class="c">%    \&gt;	\&gt;      Term = foo(\_638788,\_638792);		\\</span>
</div><div id="l704" class="code_block"><span class="c">%    \&gt;  \&gt;						\\</span>
</div><div id="l705" class="code_block"><span class="c">%    \&gt;	\&gt;	Term = foo(\_638788);			\\</span>
</div><div id="l706" class="code_block"><span class="c">%    \&gt;  \&gt;						\\</span>
</div><div id="l707" class="code_block"><span class="c">%    \&gt;	\&gt;	no</span>
</div><div id="l708" class="code_block"><span class="c">%    }</span>
</div><div id="l709" class="code_block"><span class="c">%</span>
</div><div id="l710" class="code_block"><span class="c">%    If a module is specified, {\tt current\_functor/2} succeeds only for</span>
</div><div id="l711" class="code_block"><span class="c">%    those functors (function and predicate symbols) which are defined in </span>
</div><div id="l712" class="code_block"><span class="c">%    that module. Unless the module is one of the global modules, </span>
</div><div id="l713" class="code_block"><span class="c">%    {\tt current\_functor/2} fails for the predicates which are imported </span>
</div><div id="l714" class="code_block"><span class="c">%    into that module.</span>
</div><div id="l715" class="code_block"><span class="c">%</span>
</div><div id="l716" class="code_block"><span class="c">%    On the other hand, the goal:</span>
</div><div id="l717" class="code_block"><span class="c">%</span>
</div><div id="l718" class="code_block"><span class="c">%    \stuff{</span>
</div><div id="l719" class="code_block"><span class="c">%    \&gt;	\&gt;	| ?- current\_functor(Name, Term).</span>
</div><div id="l720" class="code_block"><span class="c">%    }</span>
</div><div id="l721" class="code_block"><span class="c">%</span>
</div><div id="l722" class="code_block"><span class="c">%    can be used to backtrack through every known term {\tt Term} in the global</span>
</div><div id="l723" class="code_block"><span class="c">%    modules of \ourprolog&#39;s database that has {\tt Name} as its functor.</span>
</div><div id="l724" class="code_block"><span class="c">%</span>
</div><div id="l725" class="code_block"><span class="c">%    Note that the order of term generation is undetermined. Once again, </span>
</div><div id="l726" class="code_block"><span class="c">%    there are no error conditions associated with this predicate; if its</span>
</div><div id="l727" class="code_block"><span class="c">%    arguments are inappropriate, the predicate simply fails.</span>
</div><div id="l728" class="code_block"><span class="nb">}</span>
</div><div id="l729" class="code_block"><span class="c">%--------------------------------------------------------------------------------------------------</span>
</div><div id="l730" class="code_block">
</div><div id="l731" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>current<span class="k">\_module</span>(?Module)<span class="nb">}{</span>current<span class="k">\_module</span>/1<span class="nb">}</span>
</div><div id="l732" class="code_block">    The standard predicate <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_module</span>/1<span class="nb">}</span> allows the user to
</div><div id="l733" class="code_block">    check whether a given module is <span class="nb">{</span><span class="k">\em</span> current<span class="nb">}</span> or to generate
</div><div id="l734" class="code_block">    (through backtracking) all currently known modules.  Succeeds iff
</div><div id="l735" class="code_block">    <span class="nb">{</span><span class="k">\tt</span> Module<span class="nb">}</span> is one of the modules in the database. This includes
</div><div id="l736" class="code_block">    both user modules and system modules.  For more detailed analysis
</div><div id="l737" class="code_block">    of module properties, the predicate <span class="nb">{</span><span class="k">\tt</span> module<span class="k">\_property</span>/2<span class="nb">}</span>
</div><div id="l738" class="code_block">    can be used.
</div><div id="l739" class="code_block">
</div><div id="l740" class="code_block">    Note that predicate <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_module</span>/1<span class="nb">}</span> succeeds for a given
</div><div id="l741" class="code_block">    module even if that module does not export any predicates. There
</div><div id="l742" class="code_block">    are no error conditions associated with this predicate; if its
</div><div id="l743" class="code_block">    argument does not unify with one of the current modules, <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l744" class="code_block">    current<span class="k">\_module</span>/1<span class="nb">}</span> simply fails.
</div><div id="l745" class="code_block">
</div><div id="l746" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>current<span class="k">\_module</span>(?Module, ?ObjectFile)<span class="nb">}{</span>current<span class="k">\_module</span>/2<span class="nb">}</span>
</div><div id="l747" class="code_block">    Predicate <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_module</span>/2<span class="nb">}</span> gives the relationship between
</div><div id="l748" class="code_block">    the modules and their associated object file names. The file name
</div><div id="l749" class="code_block">    <span class="nb">{</span><span class="k">\tt</span> ObjectFile<span class="nb">}</span> must be absolute and end with the object file
</div><div id="l750" class="code_block">    extension for the system (by default, <span class="nb">{</span><span class="k">\tt</span> .xwam<span class="nb">}</span>).
</div><div id="l751" class="code_block"><span class="c">%</span>
</div><div id="l752" class="code_block">    It is possible for a current module to have no associated file
</div><div id="l753" class="code_block">    name (as is the case for <span class="nb">{</span><span class="k">\tt</span> &quot;usermod&quot;<span class="nb">}</span>), or for the system to be
</div><div id="l754" class="code_block">    unable to determine the file name of a current module. In both
</div><div id="l755" class="code_block">    cases, predicate <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_module</span>/1<span class="nb">}</span> will succeed for this
</div><div id="l756" class="code_block">    module, while <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_module</span>/2<span class="nb">}</span> will fail. The system is
</div><div id="l757" class="code_block">    unable to determine the file name of a given module if that module
</div><div id="l758" class="code_block">    is not in one of the directories of the search path (see
</div><div id="l759" class="code_block">    Section~<span class="k">\ref</span><span class="nb">{</span>LibPath<span class="nb">}</span>).  Once again, there are no error conditions
</div><div id="l760" class="code_block">    associated with this predicate; if the arguments of <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l761" class="code_block">    current<span class="k">\_module</span>/2<span class="nb">}</span> are not correct, or <span class="nb">{</span><span class="k">\tt</span> Module<span class="nb">}</span> has no
</div><div id="l762" class="code_block">    associated <span class="nb">{</span><span class="k">\tt</span> File<span class="nb">}</span>, the predicate will simply fail.
</div><div id="l763" class="code_block">
</div><div id="l764" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>current<span class="k">\_functor</span>(?Predicate<span class="k">\_Indicator</span>)<span class="nb">}</span>
</div><div id="l765" class="code_block"><span class="nb">{</span>current<span class="k">\_functor</span>/1<span class="nb">}</span>
</div><div id="l766" class="code_block"><span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_predicate</span>/1<span class="nb">}</span> can be used to backtrack through indicators
</div><div id="l767" class="code_block">for all non-atomic terms occurring in loaded modules.  If <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l768" class="code_block">Predicate<span class="k">\_Indicator</span><span class="nb">}</span> unifies with <span class="nb">{</span><span class="k">\tt</span> Module:F/A<span class="nb">}</span> all term
</div><div id="l769" class="code_block">indicators unifying with <span class="nb">{</span><span class="k">\tt</span> F/A<span class="nb">}</span> in a module unifying with <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l770" class="code_block">Module<span class="nb">}</span> are returned.  If <span class="nb">{</span><span class="k">\tt</span> Predicate<span class="k">\_indicator</span><span class="nb">}</span> is <span class="nb">{</span><span class="k">\tt</span> F/A<span class="nb">}</span>,
</div><div id="l771" class="code_block"><span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_predicate</span>/1<span class="nb">}</span> behaves as if it were called with the form
</div><div id="l772" class="code_block"><span class="nb">{</span><span class="k">\tt</span> usermod:F/A<span class="nb">}</span>.  Unlike <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_predicate</span>/1<span class="nb">}</span> <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l773" class="code_block">current<span class="k">\_functor</span>/1<span class="nb">}</span> returns not only structures occurring in
</div><div id="l774" class="code_block">predicates but predicates that are imported into loaded modules but
</div><div id="l775" class="code_block">are not yet themselves loaded.
</div><div id="l776" class="code_block">
</div><div id="l777" class="code_block">As an example, to backtrack through all of the functors of positive
</div><div id="l778" class="code_block">arity (function and predicate symbols) that appear in the global
</div><div id="l779" class="code_block">modules of the system regardless of whether they are system or a user
</div><div id="l780" class="code_block">defined, use:
</div><div id="l781" class="code_block">
</div><div id="l782" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l783" class="code_block">    <span class="k">\&gt;</span> <span class="k">\&gt;</span>	| ?- current<span class="k">\_functor</span>(Functor/Arity), Arity &gt; 0.
</div><div id="l784" class="code_block">    <span class="nb">}</span>
</div><div id="l785" class="code_block">
</div><div id="l786" class="code_block">    There are no error conditions associated with this predicate; if its 
</div><div id="l787" class="code_block">    argument is not a predicate indicator the predicate simply fails.
</div><div id="l788" class="code_block">
</div><div id="l789" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>current<span class="k">\_index</span>(Functor/Arity,IndexSpec)<span class="nb">}</span>
</div><div id="l790" class="code_block"><span class="nb">{</span>current<span class="k">\_index</span>/2<span class="nb">}</span>
</div><div id="l791" class="code_block"><span class="c">%</span>
</div><div id="l792" class="code_block">XSB has a variety of ways to index dynamic predicate including
</div><div id="l793" class="code_block">alternate argument indexing, multiple argument indexing,
</div><div id="l794" class="code_block">star-indexing, and tries, as discussed in Section~<span class="k">\ref</span><span class="nb">{</span>sec:assert<span class="nb">}</span>.
</div><div id="l795" class="code_block">In addition XSB allows a choice of which argument to index for
</div><div id="l796" class="code_block">compiled predicates as well.  <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_index</span>/2<span class="nb">}</span> returns the index
</div><div id="l797" class="code_block">specification for each functor/arity pair unifying with <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l798" class="code_block">Functor/Arity<span class="nb">}</span> and visible from the calling context of  <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_index</span>/2<span class="nb">}</span>.
</div><div id="l799" class="code_block">
</div><div id="l800" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>current<span class="k">\_atom</span>(?Atom<span class="k">\_Indicator</span>)<span class="nb">}{</span>current<span class="k">\_atom</span>/1<span class="nb">}</span>
</div><div id="l801" class="code_block">    Generates (through backtracking) all currently known atoms, and unifies
</div><div id="l802" class="code_block">    each in turn with <span class="nb">{</span><span class="k">\tt</span> Atom<span class="k">\_Indicator</span><span class="nb">}</span>. 
</div><div id="l803" class="code_block">
</div><div id="l804" class="code_block"><span class="k">\index</span><span class="nb">{</span>tabling!call subsumption<span class="nb">}</span>
</div><div id="l805" class="code_block"><span class="k">\index</span><span class="nb">{</span>tabling!call variance<span class="nb">}</span>
</div><div id="l806" class="code_block"><span class="k">\index</span><span class="nb">{</span>tabling!answer subsumption<span class="nb">}</span>
</div><div id="l807" class="code_block"><span class="k">\index</span><span class="nb">{</span>tabling!incremental<span class="nb">}</span>
</div><div id="l808" class="code_block"><span class="c">%??? need to define visible.</span>
</div><div id="l809" class="code_block"><span class="k">\label</span><span class="nb">{</span>PredProp<span class="nb">}</span>
</div><div id="l810" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>predicate<span class="k">\_property</span>(?Term<span class="k">\_Indicator</span>, ?Property)<span class="nb">}</span>
</div><div id="l811" class="code_block"><span class="nb">{</span>predicate<span class="k">\_property</span>/2<span class="nb">}</span>
</div><div id="l812" class="code_block">    The standard predicate <span class="nb">{</span><span class="k">\tt</span> predicate<span class="k">\_property</span>/2<span class="nb">}</span> can be used to find 
</div><div id="l813" class="code_block">    the properties of any predicate that is visible to a particular module.
</div><div id="l814" class="code_block">    Succeeds iff <span class="nb">{</span><span class="k">\tt</span> Term<span class="k">\_Indicator</span><span class="nb">}</span> is a term indicator for a current 
</div><div id="l815" class="code_block">    predicate whose principal functor is a predicate having <span class="nb">{</span><span class="k">\tt</span> Property<span class="nb">}</span> 
</div><div id="l816" class="code_block">    as one of its properties. Or procedurally, <span class="nb">{</span><span class="k">\tt</span> Property<span class="nb">}</span> is unified 
</div><div id="l817" class="code_block">    with the currently known properties of the predicate having 
</div><div id="l818" class="code_block">    <span class="nb">{</span><span class="k">\tt</span> Term<span class="k">\_Indicator</span><span class="nb">}</span> as its skeletal specification.
</div><div id="l819" class="code_block">    
</div><div id="l820" class="code_block">    A brief description of <span class="nb">{</span><span class="k">\tt</span> predicate<span class="k">\_property</span>/2<span class="nb">}</span> is as follows:
</div><div id="l821" class="code_block">    <span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span> 
</div><div id="l822" class="code_block"><span class="k">\item</span> If <span class="nb">{</span><span class="k">\tt</span> Term<span class="k">\_Indicator</span><span class="nb">}</span> is not a variable, and is a structure
</div><div id="l823" class="code_block">	or atom, then <span class="nb">{</span><span class="k">\tt</span> Property<span class="nb">}</span> is successively unified with the
</div><div id="l824" class="code_block">	various properties associated with <span class="nb">{</span><span class="k">\tt</span> Term<span class="k">\_Indicator</span><span class="nb">}</span>.  If
</div><div id="l825" class="code_block">	<span class="nb">{</span><span class="k">\tt</span> Term<span class="k">\_Indicator</span><span class="nb">}</span> is not a known to the system, the call
</div><div id="l826" class="code_block">	succeeds with <span class="nb">{</span><span class="k">\tt</span> Property<span class="nb">}</span> successively unified to <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l827" class="code_block">	exported<span class="nb">}</span> and <span class="nb">{</span><span class="k">\tt</span> unclassified<span class="nb">}</span>.  These properties can be
</div><div id="l828" class="code_block">	considered as a default for any structure or atom.
</div><div id="l829" class="code_block"><span class="k">\item</span> If <span class="nb">{</span><span class="k">\tt</span> Property<span class="nb">}</span> is bound to a valid predicate property, then <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l830" class="code_block">	predicate<span class="k">\_property</span>/2<span class="nb">}</span> successively unifies <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l831" class="code_block">	Term<span class="k">\_Indicator</span><span class="nb">}</span> with the skeletal specifications of all
</div><div id="l832" class="code_block">	predicates known to the system having the specified <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l833" class="code_block">	Property<span class="nb">}</span>.  
</div><div id="l834" class="code_block"><span class="k">\item</span> If <span class="nb">{</span><span class="k">\tt</span> Term<span class="k">\_Indicator</span><span class="nb">}</span> is a variable, then
</div><div id="l835" class="code_block">	it is unified (successively through backtracking) with the
</div><div id="l836" class="code_block">	most general term for a predicate whose known properties are
</div><div id="l837" class="code_block">	unified with <span class="nb">{</span><span class="k">\tt</span> Property<span class="nb">}</span>.  
</div><div id="l838" class="code_block"><span class="k">\item</span> If <span class="nb">{</span><span class="k">\tt</span> Term<span class="k">\_Indicator</span><span class="nb">}</span>
</div><div id="l839" class="code_block">	is not a term indicator, or if <span class="nb">{</span><span class="k">\tt</span> Property<span class="nb">}</span> is not a valid
</div><div id="l840" class="code_block">	predicate property, the call fails.  
</div><div id="l841" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span> 
</div><div id="l842" class="code_block"><span class="k">\noindent</span>
</div><div id="l843" class="code_block">For example, all the loaded predicate skeletal specifications in
</div><div id="l844" class="code_block">module <span class="nb">{</span><span class="k">\tt</span> &quot;usermod&quot;<span class="nb">}</span> may be enumerated using:
</div><div id="l845" class="code_block">
</div><div id="l846" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l847" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>	| ?- predicate<span class="k">\_property</span>(Pred, loaded).
</div><div id="l848" class="code_block">    <span class="nb">}</span>
</div><div id="l849" class="code_block">
</div><div id="l850" class="code_block">    Also the following query finds all predicate skeletal specifications that 
</div><div id="l851" class="code_block">    are exported by module <span class="nb">{</span><span class="k">\tt</span> blah<span class="nb">}</span>:
</div><div id="l852" class="code_block">
</div><div id="l853" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l854" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>	| ?- predicate<span class="k">\_property</span>(blah:Pred, exported).
</div><div id="l855" class="code_block">    <span class="nb">}</span>
</div><div id="l856" class="code_block">
</div><div id="l857" class="code_block">    Currently, the following properties are associated with predicates 
</div><div id="l858" class="code_block">    either implicitly or by declaration.  Double lines show property
</div><div id="l859" class="code_block">    categories, and a predicate can have at most one property of each
</div><div id="l860" class="code_block">    category.
</div><div id="l861" class="code_block">
</div><div id="l862" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l863" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\em</span> Execition Type<span class="nb">}</span> which is one of
</div><div id="l864" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l865" class="code_block"><span class="k">\item</span><span class="nb">{</span>unclassified<span class="nb">}</span> The predicate symbol is not yet classified
</div><div id="l866" class="code_block">  according to this category. This property has various meanings.
</div><div id="l867" class="code_block">  Usually for exported predicate symbols in system or user defined
</div><div id="l868" class="code_block">  modules it means that the predicate is yet unloaded (because it has
</div><div id="l869" class="code_block">  not been used).  In <span class="nb">{</span><span class="k">\tt</span> usermod<span class="nb">}</span> it usually means that the
</div><div id="l870" class="code_block">  predicate is either a function symbol, or an unloaded predicate
</div><div id="l871" class="code_block">  symbol (including constants).
</div><div id="l872" class="code_block"><span class="c">%</span>
</div><div id="l873" class="code_block"><span class="k">\item</span><span class="nb">{</span>dynamic<span class="nb">}</span> The predicate is dynamic.
</div><div id="l874" class="code_block"><span class="c">%</span>
</div><div id="l875" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> loaded<span class="nb">}</span> The predicate (including internal predicates) is a
</div><div id="l876" class="code_block">  Prolog predicate loaded into the module in question; this is always
</div><div id="l877" class="code_block">  the case for predicates in <span class="nb">{</span><span class="k">\tt</span> usermod<span class="nb">}</span>.
</div><div id="l878" class="code_block"><span class="c">%</span>
</div><div id="l879" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> unloaded<span class="nb">}</span> The predicate is yet unloaded into the module in
</div><div id="l880" class="code_block">  question.
</div><div id="l881" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> foreign<span class="nb">}</span> The predicate is a foreign predicate. This implies
</div><div id="l882" class="code_block">  that the predicate is already loaded in the system, because
</div><div id="l883" class="code_block">  currently there is no way for XSB to know that a predicate is a
</div><div id="l884" class="code_block">  foreign predicate until it is loaded in the system.
</div><div id="l885" class="code_block"><span class="c">%</span>
</div><div id="l886" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l887" class="code_block"><span class="c">%</span>
</div><div id="l888" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\em</span> Visibility Type<span class="nb">}</span> which can be one of
</div><div id="l889" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l890" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> exported<span class="nb">}</span> The predicate symbol is exported by the module in
</div><div id="l891" class="code_block">  question; in other words the predicate symbol is visible to any
</div><div id="l892" class="code_block">  other module in the system.
</div><div id="l893" class="code_block"><span class="c">%</span>
</div><div id="l894" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> local<span class="nb">}</span> The predicate symbol is local to the module in
</div><div id="l895" class="code_block">  question.
</div><div id="l896" class="code_block"><span class="c">%</span>
</div><div id="l897" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> imported<span class="k">\_from</span>(Mod)<span class="nb">}</span> The predicate symbol is imported into
</div><div id="l898" class="code_block">  the module in question from module <span class="nb">{</span><span class="k">\tt</span> Mod<span class="nb">}</span>.
</div><div id="l899" class="code_block"><span class="c">%</span>
</div><div id="l900" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l901" class="code_block"><span class="c">%</span>
</div><div id="l902" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\em</span> Tabling Call Behavior<span class="nb">}</span> which can be one of 
</div><div id="l903" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l904" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> tabled(variant)<span class="nb">}</span> The predicate has been declared tabled and
</div><div id="l905" class="code_block">  to use call variance.
</div><div id="l906" class="code_block"><span class="c">%</span>
</div><div id="l907" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> tabled(subsumptive)<span class="nb">}</span> The predicate has been declared tabled and
</div><div id="l908" class="code_block">  to use call subsumption
</div><div id="l909" class="code_block"><span class="c">%</span>
</div><div id="l910" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> tabled(default)<span class="nb">}</span> The predicate has been declared tabled and
</div><div id="l911" class="code_block">  to use the default tabling strategy of the session, which can be
</div><div id="l912" class="code_block">  either call variance or call subsumption.
</div><div id="l913" class="code_block"><span class="c">%</span>
</div><div id="l914" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l915" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\em</span> Incremental Tabling Behavior<span class="nb">}</span> which can be one of 
</div><div id="l916" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l917" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> incremental<span class="nb">}</span> The predicate was declared as either
</div><div id="l918" class="code_block">  incremental dynamic or as incremental tabled; or
</div><div id="l919" class="code_block"><span class="c">%</span>
</div><div id="l920" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> opaque<span class="nb">}</span> The predicate was declared as opaque to incremental
</div><div id="l921" class="code_block">  updates.
</div><div id="l922" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l923" class="code_block"><span class="c">%</span>
</div><div id="l924" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> spied<span class="nb">}</span> The predicate symbol has been declared spied (either
</div><div id="l925" class="code_block">  conditionally or unconditionally).
</div><div id="l926" class="code_block"><span class="c">%</span>
</div><div id="l927" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> shared<span class="nb">}</span> The predicate has been declared shared in the
</div><div id="l928" class="code_block">  multi-threaded engine.  This means that any dynamic code or tables
</div><div id="l929" class="code_block">  for this predicate will be shared among threads, but it does not
</div><div id="l930" class="code_block">  affect static, non-tabled code.  
</div><div id="l931" class="code_block"><span class="c">%</span>
</div><div id="l932" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> built<span class="k">\_in</span><span class="nb">}</span> The predicate symbol has the same
</div><div id="l933" class="code_block">  Functor and Arity as one of XSB&#39;s standard predicates, and is
</div><div id="l934" class="code_block">  available tothe user without needing to load a file or import
</div><div id="l935" class="code_block">  th epredicate from a module. 
</div><div id="l936" class="code_block"><span class="c">%</span>
</div><div id="l937" class="code_block"><span class="c">%\item{\tt built\_in} Same meaning as the property {\tt</span>
</div><div id="l938" class="code_block"><span class="c">%  xsb\_standard\_pred}.  This property provides compatibility with</span>
</div><div id="l939" class="code_block"><span class="c">%  other Prolog compilers and with forthcoming ISO Prolog</span>
</div><div id="l940" class="code_block"><span class="c">%  standards. </span>
</div><div id="l941" class="code_block"><span class="c">%</span>
</div><div id="l942" class="code_block"><span class="k">\item</span><span class="nb">{</span><span class="k">\tt</span> meta<span class="k">\_predicate</span>(Template)<span class="nb">}</span>  The
</div><div id="l943" class="code_block">  predicate is a meta-predicate. This property provides
</div><div id="l944" class="code_block">  compatibility with other Prolog compilers and with forthcoming
</div><div id="l945" class="code_block">  ISO Prolog standards. 
</div><div id="l946" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l947" class="code_block">
</div><div id="l948" class="code_block">    Finally, since <span class="nb">{</span><span class="k">\tt</span> dynamic<span class="nb">}</span> is usually declared as an operator with 
</div><div id="l949" class="code_block">    precedence greater than 999, writing the following:
</div><div id="l950" class="code_block">
</div><div id="l951" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l952" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>	| ?- predicate<span class="k">\_property</span>(X, dynamic).
</div><div id="l953" class="code_block">    <span class="nb">}</span>
</div><div id="l954" class="code_block">
</div><div id="l955" class="code_block">    will cause a syntax error. The way to achieve the desired result is to
</div><div id="l956" class="code_block">    parenthesize the operator like in:
</div><div id="l957" class="code_block">
</div><div id="l958" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l959" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>	| ?- predicate<span class="k">\_property</span>(X, (dynamic)).
</div><div id="l960" class="code_block">    <span class="nb">}</span>
</div><div id="l961" class="code_block">
</div><div id="l962" class="code_block">
</div><div id="l963" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>module<span class="k">\_property</span>(?Module, ?Property)<span class="nb">}{</span>module<span class="k">\_property</span>/2<span class="nb">}</span>
</div><div id="l964" class="code_block">    The standard predicate <span class="nb">{</span><span class="k">\tt</span> module<span class="k">\_property</span>/2<span class="nb">}</span> can be used to find the
</div><div id="l965" class="code_block">    properties of any current module.
</div><div id="l966" class="code_block">    Succeeds iff <span class="nb">{</span><span class="k">\tt</span> Module<span class="nb">}</span> is the name of a current module having 
</div><div id="l967" class="code_block">    <span class="nb">{</span><span class="k">\tt</span> Property<span class="nb">}</span> as one of its properties. Or procedurally, <span class="nb">{</span><span class="k">\tt</span> Property<span class="nb">}</span>
</div><div id="l968" class="code_block">    is unified with the currently known properties of the module having 
</div><div id="l969" class="code_block">    <span class="nb">{</span><span class="k">\tt</span> Module<span class="nb">}</span> as its name.
</div><div id="l970" class="code_block">
</div><div id="l971" class="code_block">    Currently, the following properties are associated with modules 
</div><div id="l972" class="code_block">    implicitly 
</div><div id="l973" class="code_block">
</div><div id="l974" class="code_block">    <span class="k">\begin</span><span class="nb">{</span>center<span class="nb">}</span>
</div><div id="l975" class="code_block">    <span class="k">\begin</span><span class="nb">{</span>tabular<span class="nb">}{</span>||l|l||<span class="nb">}</span>               <span class="k">\hline</span> 
</div><div id="l976" class="code_block">	<span class="nb">{</span><span class="k">\em</span> Property<span class="nb">}</span>		<span class="nb">&amp;</span> <span class="nb">{</span><span class="k">\em</span> Explanation<span class="nb">}</span> <span class="k">\\</span> <span class="k">\hline</span> <span class="k">\hline</span>
</div><div id="l977" class="code_block">	<span class="nb">{</span><span class="k">\tt</span> unloaded<span class="nb">}</span>		<span class="nb">&amp;</span> 
</div><div id="l978" class="code_block">		The module (including system modules) though it is <span class="k">\\</span>
</div><div id="l979" class="code_block">	<span class="nb">&amp;</span>	current, is yet unloaded in the system. <span class="k">\\</span> <span class="k">\hline</span>
</div><div id="l980" class="code_block">	<span class="nb">{</span><span class="k">\tt</span> loaded<span class="nb">}</span>		<span class="nb">&amp;</span> 
</div><div id="l981" class="code_block">		The module (including system modules) is loaded in the <span class="k">\\</span>
</div><div id="l982" class="code_block">	<span class="nb">&amp;</span>	system; this is always the case for <span class="nb">{</span><span class="k">\tt</span> usermod<span class="nb">}</span>.<span class="k">\\</span> <span class="k">\hline</span>
</div><div id="l983" class="code_block">    <span class="k">\end</span><span class="nb">{</span>tabular<span class="nb">}</span>
</div><div id="l984" class="code_block">    <span class="k">\end</span><span class="nb">{</span>center<span class="nb">}</span>
</div><div id="l985" class="code_block">
</div><div id="l986" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>listing<span class="nb">}{</span>listing/0<span class="nb">}</span>
</div><div id="l987" class="code_block">    Lists in the current output stream the clauses for all dynamic
</div><div id="l988" class="code_block">    predicates found in module <span class="nb">{</span><span class="k">\tt</span> usermod<span class="nb">}</span>.  Note that <span class="nb">{</span><span class="k">\tt</span> listing/0<span class="nb">}</span>
</div><div id="l989" class="code_block">    does not list any compiled predicates unless they have the
</div><div id="l990" class="code_block">    <span class="nb">{</span><span class="k">\tt</span> dynamic<span class="nb">}</span> property (see <span class="nb">{</span><span class="k">\tt</span> predicate<span class="k">\_property</span>/2<span class="nb">}</span>).  A
</div><div id="l991" class="code_block">    predicate gets the <span class="nb">{</span><span class="k">\tt</span> dynamic<span class="nb">}</span> property when it is explicitly
</div><div id="l992" class="code_block">    declared as <span class="nb">{</span><span class="k">\tt</span> dynamic<span class="nb">}</span>, or automatically acquires it when some
</div><div id="l993" class="code_block">    clauses for that predicate are asserted in the database.  In
</div><div id="l994" class="code_block">    cases where a predicate was compiled but converted to <span class="nb">{</span><span class="k">\tt</span> dynamic<span class="nb">}</span>
</div><div id="l995" class="code_block">    by asserting additional clauses for that predicate, <span class="nb">{</span><span class="k">\tt</span> listing/0<span class="nb">}</span>
</div><div id="l996" class="code_block">    will just display an indication that there exist compiled clauses
</div><div id="l997" class="code_block">    for that predicate and only the dynamically created clauses of the
</div><div id="l998" class="code_block">    predicate will be listed.  For example:
</div><div id="l999" class="code_block">
</div><div id="l1000" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span> 
</div><div id="l1001" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     | ?- [user]. <span class="k">\\</span> 
</div><div id="l1002" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     [Compiling user] <span class="k">\\</span>
</div><div id="l1003" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     a(X) :- b(X). <span class="k">\\</span>
</div><div id="l1004" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     a(1). <span class="k">\\</span>
</div><div id="l1005" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     [user compiled, cpu time used: 0.3 seconds] <span class="k">\\</span>
</div><div id="l1006" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     [user loaded] <span class="k">\\</span>
</div><div id="l1007" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     <span class="k">\\</span>
</div><div id="l1008" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     yes <span class="k">\\</span>
</div><div id="l1009" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     | ?- assert(a(3)). <span class="k">\\</span>
</div><div id="l1010" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     <span class="k">\\</span>
</div><div id="l1011" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     yes <span class="k">\\</span>
</div><div id="l1012" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     | ?- listing. <span class="k">\\</span>
</div><div id="l1013" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     <span class="k">\\</span>
</div><div id="l1014" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     a(A) :- <span class="k">\\</span>
</div><div id="l1015" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>  <span class="k">\&gt;</span>    <span class="k">\$</span>compiled. <span class="k">\\</span>
</div><div id="l1016" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     a(3). <span class="k">\\</span>
</div><div id="l1017" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     <span class="k">\\</span>
</div><div id="l1018" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     yes <span class="k">\\</span>
</div><div id="l1019" class="code_block">    <span class="nb">}</span>
</div><div id="l1020" class="code_block">
</div><div id="l1021" class="code_block">    Predicate <span class="nb">{</span><span class="k">\tt</span> listing/0<span class="nb">}</span> always succeeds.  The query:
</div><div id="l1022" class="code_block">
</div><div id="l1023" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l1024" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     | ?- listing.
</div><div id="l1025" class="code_block">    <span class="nb">}</span>
</div><div id="l1026" class="code_block">
</div><div id="l1027" class="code_block">    <span class="k">\noindent</span>
</div><div id="l1028" class="code_block">    is just a notational shorthand for the query:
</div><div id="l1029" class="code_block">
</div><div id="l1030" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l1031" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     | ?- listing(X).
</div><div id="l1032" class="code_block">    <span class="nb">}</span>
</div><div id="l1033" class="code_block">
</div><div id="l1034" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>listing(+Predicate<span class="k">\_Indicator</span>)<span class="nb">}{</span>listing/1<span class="nb">}</span>
</div><div id="l1035" class="code_block">    If <span class="nb">{</span><span class="k">\tt</span> Predicate<span class="k">\_Indicator</span><span class="nb">}</span> is a variable then <span class="nb">{</span><span class="k">\tt</span> listing/1<span class="nb">}</span> is
</div><div id="l1036" class="code_block">    equivalent to <span class="nb">{</span><span class="k">\tt</span> listing/0<span class="nb">}</span>.
</div><div id="l1037" class="code_block">    If <span class="nb">{</span><span class="k">\tt</span> Predicate<span class="k">\_Indicator</span><span class="nb">}</span> is an atom, then <span class="nb">{</span><span class="k">\tt</span> listing/1<span class="nb">}</span> 
</div><div id="l1038" class="code_block">    lists the dynamic clauses for all predicates of that name found in 
</div><div id="l1039" class="code_block">    module <span class="nb">{</span><span class="k">\tt</span> usermod<span class="nb">}</span> of the database.
</div><div id="l1040" class="code_block">    The argument <span class="nb">{</span><span class="k">\tt</span> Predicate<span class="k">\_Indicator</span><span class="nb">}</span> can also be a predicate 
</div><div id="l1041" class="code_block">    indicator of the form <span class="nb">{</span><span class="k">\tt</span> Name/Arity<span class="nb">}</span> in which case only the 
</div><div id="l1042" class="code_block">    clauses for the specified predicate are listed.
</div><div id="l1043" class="code_block">    Finally, it is possible for <span class="nb">{</span><span class="k">\tt</span> Predicate<span class="k">\_Indicator</span><span class="nb">}</span>
</div><div id="l1044" class="code_block">    to be a list of predicate indicators and/or atoms; e.g.
</div><div id="l1045" class="code_block">
</div><div id="l1046" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l1047" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     | ?- listing([foo/2, bar, blah/4]).
</div><div id="l1048" class="code_block">    <span class="nb">}</span>
</div><div id="l1049" class="code_block">
</div><div id="l1050" class="code_block">    If <span class="nb">{</span><span class="k">\tt</span> Predicate<span class="k">\_Indicator</span><span class="nb">}</span> is not a variable, an atom or a predicate 
</div><div id="l1051" class="code_block">    indicator (or list of predicate indicators) of the form <span class="nb">{</span><span class="k">\tt</span> Name/Arity<span class="nb">}</span>, 
</div><div id="l1052" class="code_block">    predicate <span class="nb">{</span><span class="k">\tt</span> listing/1<span class="nb">}</span> will simply fail.
</div><div id="l1053" class="code_block">
</div><div id="l1054" class="code_block">    In future releases of <span class="k">\ourprolog</span>, we intend to allow the user to
</div><div id="l1055" class="code_block">    specify a predicate indicator of the form <span class="nb">{</span><span class="k">\tt</span> Module:Name/Arity<span class="nb">}</span> 
</div><div id="l1056" class="code_block">    as argument of <span class="nb">{</span><span class="k">\tt</span> listing/1<span class="nb">}</span>.
</div><div id="l1057" class="code_block">
</div><div id="l1058" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>xsb<span class="k">\_configuration</span>(Feature<span class="k">\_Name</span>, ?Value)<span class="nb">}</span>
</div><div id="l1059" class="code_block"><span class="nb">{</span>xsb<span class="k">\_configuration</span>/2<span class="nb">}</span>
</div><div id="l1060" class="code_block">    Succeeds iff the current value of the XSB  feature <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l1061" class="code_block">    Feature<span class="k">\_Name</span><span class="nb">}</span> is <span class="nb">{</span><span class="k">\tt</span> Value<span class="nb">}</span>.
</div><div id="l1062" class="code_block">
</div><div id="l1063" class="code_block">    This predicate provides information on a wide variety of features
</div><div id="l1064" class="code_block">    related to how XSB was built, including the compiler used, the compiler
</div><div id="l1065" class="code_block">    and loader flags, the machine and OS on which XSB was built, the
</div><div id="l1066" class="code_block">    release number, the various directories that XSB uses to find its
</div><div id="l1067" class="code_block">    libraries, etc.
</div><div id="l1068" class="code_block">
</div><div id="l1069" class="code_block">    To find all features and their values, ask the following query:
</div><div id="l1070" class="code_block">
</div><div id="l1071" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l1072" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>	| ?- xsb<span class="k">\_configuration</span>(FeatureName, Value), fail.
</div><div id="l1073" class="code_block">    <span class="nb">}</span>
</div><div id="l1074" class="code_block">
</div><div id="l1075" class="code_block">    Here is how <span class="nb">{</span><span class="k">\tt</span> xsb<span class="k">\_configuration</span><span class="nb">}</span> might look like:
</div><div id="l1076" class="code_block">
</div><div id="l1077" class="code_block"><span class="nb">{</span><span class="k">\small</span>
</div><div id="l1078" class="code_block"><span class="k">\begin</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l1079" class="code_block">    xsb<span class="nb">_</span>configuration(architecture, &#39;i386-apple-darwin8.9.1&#39;).
</div><div id="l1080" class="code_block">    <span class="c">%% configuration is usualy the same as architecture, but it can also</span>
</div><div id="l1081" class="code_block">    <span class="c">%% contain special tags, {\it e.g.}, i386-apple-darwin8.9.1-dbg, for a verion</span>
</div><div id="l1082" class="code_block">    <span class="c">%% built with debugging enabled.</span>
</div><div id="l1083" class="code_block">    xsb<span class="nb">_</span>configuration(configuration, &#39;i386-apple-darwin8.9.1-dbg&#39;).
</div><div id="l1084" class="code_block">    xsb<span class="nb">_</span>configuration(host<span class="nb">_</span>os, &#39;darwin8.9.1&#39;).
</div><div id="l1085" class="code_block">    xsb<span class="nb">_</span>configuration(os<span class="nb">_</span>version, &#39;8.9.1&#39;).
</div><div id="l1086" class="code_block">    xsb<span class="nb">_</span>configuration(os<span class="nb">_</span>type, &#39;darwin&#39;).
</div><div id="l1087" class="code_block">    xsb<span class="nb">_</span>configuration(host<span class="nb">_</span>vendor, &#39;apple&#39;).
</div><div id="l1088" class="code_block">    xsb<span class="nb">_</span>configuration(host<span class="nb">_</span>cpu,  &#39;i386&#39;).
</div><div id="l1089" class="code_block">    xsb<span class="nb">_</span>configuration(compiler, &#39;gcc&#39;).
</div><div id="l1090" class="code_block">    xsb<span class="nb">_</span>configuration(compiler<span class="nb">_</span>flags, &#39;-faltivec -fPOC -Wall -pipe -g&#39;).
</div><div id="l1091" class="code_block">    xsb<span class="nb">_</span>configuration(loader<span class="nb">_</span>flags, &#39;-g -lm &#39;).
</div><div id="l1092" class="code_block">    xsb<span class="nb">_</span>configuration(compile<span class="nb">_</span>mode, &#39;debug&#39;).
</div><div id="l1093" class="code_block">    <span class="c">%% The type of XSB engine configured.</span>
</div><div id="l1094" class="code_block">    xsb<span class="nb">_</span>configuration(scheduling<span class="nb">_</span>strategy, &#39;(local)&#39;).
</div><div id="l1095" class="code_block">    xsb<span class="nb">_</span>configuration(engine<span class="nb">_</span>mode, &#39;slg-wam&#39;).
</div><div id="l1096" class="code_block">    xsb<span class="nb">_</span>configuration(word<span class="nb">_</span>size, &#39;32&#39;).
</div><div id="l1097" class="code_block">    <span class="c">%% The following is XSB release information</span>
</div><div id="l1098" class="code_block">    xsb<span class="nb">_</span>configuration(major<span class="nb">_</span>version, &#39;3&#39;).
</div><div id="l1099" class="code_block">    xsb<span class="nb">_</span>configuration(minor<span class="nb">_</span>version, &#39;3&#39;).
</div><div id="l1100" class="code_block">    xsb<span class="nb">_</span>configuration(patch<span class="nb">_</span>version, &#39;1&#39;).
</div><div id="l1101" class="code_block">    xsb<span class="nb">_</span>configuration(beta<span class="nb">_</span>version, &#39;&#39;).
</div><div id="l1102" class="code_block">    xsb<span class="nb">_</span>configuration(version, &#39;3.3.1&#39;).
</div><div id="l1103" class="code_block">    xsb<span class="nb">_</span>configuration(codename, &#39;Pignoletto&#39;).
</div><div id="l1104" class="code_block">    xsb<span class="nb">_</span>configuration(release<span class="nb">_</span>date, date(2011, 04, 12)).
</div><div id="l1105" class="code_block">    <span class="c">%% Support for other languages</span>
</div><div id="l1106" class="code_block">    xsb<span class="nb">_</span>configuration(perl<span class="nb">_</span>support, &#39;yes&#39;).v
</div><div id="l1107" class="code_block">    xsb<span class="nb">_</span>configuration(perl<span class="nb">_</span>archlib, &#39;/usr/lib/perl5/i386-linux/5.00404&#39;).
</div><div id="l1108" class="code_block">    xsb<span class="nb">_</span>configuration(perl<span class="nb">_</span>cc<span class="nb">_</span>compiler, &#39;cc&#39;).
</div><div id="l1109" class="code_block">    xsb<span class="nb">_</span>configuration(perl<span class="nb">_</span>ccflags, &#39;-Dbool=char -DHAS<span class="nb">_</span>BOOL -I/usr/local/include&#39;).
</div><div id="l1110" class="code_block">    xsb<span class="nb">_</span>configuration(perl<span class="nb">_</span>libs, &#39;-lnsl -lndbm -lgdbm -ldb -ldl -lm -lc -lposix -lcrypt&#39;).
</div><div id="l1111" class="code_block">    xsb<span class="nb">_</span>configuration(javac, &#39;/usr/bin/javac&#39;).
</div><div id="l1112" class="code_block">    /* Tells where XSB is currently residing; can be moved */
</div><div id="l1113" class="code_block">    xsb<span class="nb">_</span>configuration(install<span class="nb">_</span>dir, InstallDir) :- ...
</div><div id="l1114" class="code_block">    /* User home directory. Usually HOME. If that is null, then it would
</div><div id="l1115" class="code_block">       be the directory where XSB is currently residing.
</div><div id="l1116" class="code_block">       This is where we expect to find the .xsb directory */
</div><div id="l1117" class="code_block">    xsb<span class="nb">_</span>configuration(user<span class="nb">_</span>home, Home) :- ...
</div><div id="l1118" class="code_block">    /* Where XSB invocation script is residing */
</div><div id="l1119" class="code_block">    xsb<span class="nb">_</span>configuration(scriptdir, ScriptDir) :- ...
</div><div id="l1120" class="code_block">    /* where are cmplib, syslib, lib, packages, etc live */
</div><div id="l1121" class="code_block">    xsb<span class="nb">_</span>configuration(cmplibdir, CmplibDir) :- ...
</div><div id="l1122" class="code_block">    xsb<span class="nb">_</span>configuration(libdir, LibDir) :- ...
</div><div id="l1123" class="code_block">    xsb<span class="nb">_</span>configuration(syslibdir, SyslibDir) :- ...
</div><div id="l1124" class="code_block">    xsb<span class="nb">_</span>configuration(packagesdir, PackDir) :-  ...
</div><div id="l1125" class="code_block">    xsb<span class="nb">_</span>configuration(etcdir, EtcDir) :- ...
</div><div id="l1126" class="code_block">    /* architecture and configuration specific directories */
</div><div id="l1127" class="code_block">    xsb<span class="nb">_</span>configuration(config<span class="nb">_</span>dir, ConfigDir) :- ...
</div><div id="l1128" class="code_block">    xsb<span class="nb">_</span>configuration(config<span class="nb">_</span>libdir, ConfigLibdir) :- ...
</div><div id="l1129" class="code_block">    /* site-specific directories */
</div><div id="l1130" class="code_block">    xsb<span class="nb">_</span>configuration(site<span class="nb">_</span>dir, &#39;/usr/local/XSB/site&#39;).
</div><div id="l1131" class="code_block">    xsb<span class="nb">_</span>configuration(site<span class="nb">_</span>libdir, SiteLibdir) :- ...
</div><div id="l1132" class="code_block">    /* site and configuration-specific directories */
</div><div id="l1133" class="code_block">    xsb<span class="nb">_</span>configuration(site<span class="nb">_</span>config<span class="nb">_</span>dir, SiteConfigDir) :- ...
</div><div id="l1134" class="code_block">    xsb<span class="nb">_</span>configuration(site<span class="nb">_</span>config<span class="nb">_</span>libdir, SiteConfigLibdir) :- ...
</div><div id="l1135" class="code_block">    /* Where user&#39;s arch-specific libraries are found by default. */
</div><div id="l1136" class="code_block">    xsb<span class="nb">_</span>configuration(user<span class="nb">_</span>config<span class="nb">_</span>libdir, UserConfigLibdir) :- ...
</div><div id="l1137" class="code_block"><span class="k">\end</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l1138" class="code_block"><span class="nb">}</span>
</div><div id="l1139" class="code_block">
</div><div id="l1140" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>hilog<span class="k">\_symbol</span>(?Symbol)<span class="nb">}{</span>hilog<span class="k">\_symbol</span>/1<span class="nb">}</span>
</div><div id="l1141" class="code_block">    Succeeds iff <span class="nb">{</span><span class="k">\tt</span> Symbol<span class="nb">}</span> has been declared as a HiLog symbol, or 
</div><div id="l1142" class="code_block">    procedurally unifies <span class="nb">{</span><span class="k">\tt</span> Symbol<span class="nb">}</span> with one of the currently known 
</div><div id="l1143" class="code_block">    (because of a prior declaration) HiLog symbols. The HiLog symbols
</div><div id="l1144" class="code_block">    are always atoms, but if the argument of <span class="nb">{</span><span class="k">\tt</span> hilog<span class="k">\_symbol</span><span class="nb">}</span>,
</div><div id="l1145" class="code_block">    though instantiated, is not an atom the predicate simply fails.
</div><div id="l1146" class="code_block">    So, one can enumerate all the HiLog symbols by using the following
</div><div id="l1147" class="code_block">    query:
</div><div id="l1148" class="code_block">
</div><div id="l1149" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l1150" class="code_block">    <span class="k">\&gt;</span>   <span class="k">\&gt;</span>	| ?- hilog<span class="k">\_symbol</span>(X).
</div><div id="l1151" class="code_block">    <span class="nb">}</span>
</div><div id="l1152" class="code_block">
</div><div id="l1153" class="code_block"><span class="k">\isoitem</span><span class="nb">{</span>current<span class="k">\_op</span>(?Precedence, ?Specifier, ?Name)<span class="nb">}{</span>current<span class="k">\_op</span>/3<span class="nb">}</span>
</div><div id="l1154" class="code_block"><span class="c">%</span>
</div><div id="l1155" class="code_block">    This predicate is used to examine the set of operators currently
</div><div id="l1156" class="code_block">    in force.  It succeeds when the atom <span class="nb">{</span><span class="k">\tt</span> Name<span class="nb">}</span> is currently an
</div><div id="l1157" class="code_block">    operator of type <span class="nb">{</span><span class="k">\tt</span> Specifier<span class="nb">}</span> and precedence <span class="nb">{</span><span class="k">\tt</span> Precedence<span class="nb">}</span>.  None
</div><div id="l1158" class="code_block">    of the arguments of <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_op</span>/3<span class="nb">}</span> need to be instantiated at
</div><div id="l1159" class="code_block">    the time of the call, but if they are, they must be of the
</div><div id="l1160" class="code_block">    following types: 
</div><div id="l1161" class="code_block"><span class="k">\begin</span><span class="nb">{</span>description<span class="nb">}</span>
</div><div id="l1162" class="code_block"><span class="k">\item</span><span class="na">[{\tt Precedence}]</span> must be an integer in the range from 1 to 1200.  
</div><div id="l1163" class="code_block"><span class="k">\item</span><span class="na">[{\tt Specifier}]</span> must be one of the atoms: 
</div><div id="l1164" class="code_block"><span class="k">\begin</span><span class="nb">{</span>verbatim<span class="nb">}</span> 
</div><div id="l1165" class="code_block">xfx xfy yfx fx fy hx hy xf yf 
</div><div id="l1166" class="code_block"><span class="k">\end</span><span class="nb">{</span>verbatim<span class="nb">}</span> 
</div><div id="l1167" class="code_block"><span class="k">\item</span><span class="na">[{\tt Name}]</span> it must be an atom.
</div><div id="l1168" class="code_block"><span class="k">\end</span><span class="nb">{</span>description<span class="nb">}</span>
</div><div id="l1169" class="code_block">
</div><div id="l1170" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Error Cases<span class="nb">}</span>
</div><div id="l1171" class="code_block"><span class="k">\bi</span>
</div><div id="l1172" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Precedence<span class="nb">}</span> is neither a variable nor an integer in the
</div><div id="l1173" class="code_block">range from 1 to 1200. 
</div><div id="l1174" class="code_block"><span class="k">\bi</span>
</div><div id="l1175" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> domain<span class="k">\_error</span>(operator<span class="k">\_priority</span>,Precedence)<span class="nb">}</span>
</div><div id="l1176" class="code_block"><span class="k">\ei</span>
</div><div id="l1177" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Specifier<span class="nb">}</span> is neither a variable nor an operator
</div><div id="l1178" class="code_block">specifier of the types above.
</div><div id="l1179" class="code_block"><span class="k">\bi</span>
</div><div id="l1180" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> domain<span class="k">\_error</span>(operator<span class="k">\_specifier</span>,Specifier)<span class="nb">}</span>
</div><div id="l1181" class="code_block"><span class="k">\ei</span>
</div><div id="l1182" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Name<span class="nb">}</span> is neither a variable nor an atom.
</div><div id="l1183" class="code_block"><span class="k">\bi</span>
</div><div id="l1184" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> domain<span class="k">\_error</span>(atom<span class="k">\_or\_variable</span>,Name)<span class="nb">}</span>
</div><div id="l1185" class="code_block"><span class="k">\ei</span>
</div><div id="l1186" class="code_block"><span class="k">\ei</span>
</div><div id="l1187" class="code_block">
</div><div id="l1188" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>hilog<span class="k">\_op</span>(?Precedence, ?Type, ?Name)<span class="nb">}{</span>hilog<span class="k">\_op</span>/3<span class="nb">}</span>
</div><div id="l1189" class="code_block">    This predicate has exactly the same behaviour as <span class="nb">{</span><span class="k">\tt</span> current<span class="k">\_op</span>/3<span class="nb">}</span>
</div><div id="l1190" class="code_block">    with the only difference that <span class="nb">{</span><span class="k">\tt</span> Type<span class="nb">}</span> can only have the values
</div><div id="l1191" class="code_block">    <span class="nb">{</span><span class="k">\tt</span> hx<span class="nb">}</span> and <span class="nb">{</span><span class="k">\tt</span> hy<span class="nb">}</span>.
</div><div id="l1192" class="code_block"><span class="k">\end</span><span class="nb">{</span>description<span class="nb">}</span>
</div><div id="l1193" class="code_block">
</div><div id="l1194" class="code_block">
</div><div id="l1195" class="code_block"><span class="c">%%% Local Variables: </span>
</div><div id="l1196" class="code_block"><span class="c">%%% mode: latex</span>
</div><div id="l1197" class="code_block"><span class="c">%%% TeX-master: &quot;manual1&quot;</span>
</div><div id="l1198" class="code_block"><span class="c">%%% End: </span>
</div><div id="l1199" class="code_block">
</div><div id="l1200" class="code_block"><span class="c">%======================================================</span>
</div><div id="l1201" class="code_block">
</div><div id="l1202" class="code_block"><span class="k">\section</span><span class="nb">{</span>Execution State<span class="nb">}</span><span class="k">\label</span><span class="nb">{</span>environmental<span class="nb">}</span>
</div><div id="l1203" class="code_block">
</div><div id="l1204" class="code_block"><span class="k">\begin</span><span class="nb">{</span>description<span class="nb">}</span>
</div><div id="l1205" class="code_block">
</div><div id="l1206" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>break<span class="nb">}{</span>break/0<span class="nb">}</span>
</div><div id="l1207" class="code_block"><span class="c">%</span>
</div><div id="l1208" class="code_block">Causes the current execution to be suspended at the beginning of the
</div><div id="l1209" class="code_block">next call.  The interpreter then suspends the current computation,
</div><div id="l1210" class="code_block">enters break level 1 and is ready to accept input as if it were at top
</div><div id="l1211" class="code_block">level.  If another call to <span class="nb">{</span><span class="k">\tt</span> break/0<span class="nb">}</span> is encountered, it moves down
</div><div id="l1212" class="code_block">to break level 2, and so on.  As long as the current computation
</div><div id="l1213" class="code_block">occurs at break level <span class="s">$</span><span class="nb">n&gt;</span><span class="m">0</span><span class="s">$</span> the prompt changes to <span class="nb">{</span><span class="k">\tt</span> <span class="s">$</span><span class="nb">n</span><span class="s">$</span>: ?-<span class="nb">}</span>.  
</div><div id="l1214" class="code_block">
</div><div id="l1215" class="code_block">To close a break level and resume the suspended execution, the user
</div><div id="l1216" class="code_block">can type the the atom <span class="nb">{</span><span class="k">\tt</span> end<span class="k">\_of\_file</span><span class="nb">}</span> or the end-of-file character
</div><div id="l1217" class="code_block">applicable on the system (usually <span class="nb">{</span><span class="k">\tt</span> CTRL-d<span class="nb">}</span> on UNIX systems).
</div><div id="l1218" class="code_block">Predicate <span class="nb">{</span><span class="k">\tt</span> break/0<span class="nb">}</span> then succeeds (note in the following example
</div><div id="l1219" class="code_block">that the calls to <span class="nb">{</span><span class="k">\tt</span> break/0<span class="nb">}</span> do not succeed), and the execution of
</div><div id="l1220" class="code_block">the interrupted program is resumed.  Alternatively, the suspended
</div><div id="l1221" class="code_block">execution can be abandoned by calling the standard predicate <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l1222" class="code_block">  abort/0<span class="nb">}</span>, which causes a return to the top level~<span class="k">\footnote</span><span class="nb">{</span>If only
</div><div id="l1223" class="code_block">  the break-level computation should be aborted, the predicate <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l1224" class="code_block">    abort<span class="k">\_level</span>/[0,1]<span class="nb">}</span> can be called.  This should rarely be needed,
</div><div id="l1225" class="code_block">  except if a specialized intepreter is written using XSB.<span class="nb">}</span>.
</div><div id="l1226" class="code_block">
</div><div id="l1227" class="code_block">    An example of <span class="nb">{</span><span class="k">\tt</span> break/0<span class="nb">}</span> &#39;s use is the following:
</div><div id="l1228" class="code_block">
</div><div id="l1229" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l1230" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     | ?- break. <span class="k">\\</span>
</div><div id="l1231" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     [ Break (level 1) ] <span class="k">\\</span>
</div><div id="l1232" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     1: ?- break. <span class="k">\\</span>
</div><div id="l1233" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     [ Break (level 2) ] <span class="k">\\</span>
</div><div id="l1234" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     2: ?- end<span class="k">\_of\_file</span>. <span class="k">\\</span>
</div><div id="l1235" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     [ End break (level 2) ] <span class="k">\\</span>
</div><div id="l1236" class="code_block">        <span class="k">\\</span>
</div><div id="l1237" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     yes <span class="k">\\</span>
</div><div id="l1238" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     1: ?-
</div><div id="l1239" class="code_block">    <span class="nb">}</span>
</div><div id="l1240" class="code_block">
</div><div id="l1241" class="code_block">It is important to note that when XSB is interrupted via a ctrl-C, the
</div><div id="l1242" class="code_block">current computation is suspended, and a new break level is entered.
</div><div id="l1243" class="code_block">Any incomplete tables in the suspended computation can be examined,
</div><div id="l1244" class="code_block">making break levels useful for for analyzing tabled computations under
</div><div id="l1245" class="code_block">execution, as described in Section~<span class="k">\ref</span><span class="nb">{</span>sec:suspend-analyze<span class="nb">}</span>.
</div><div id="l1246" class="code_block">However, it is also important to note that executing a tabled
</div><div id="l1247" class="code_block">predicate during a break point throws an exception if there are
</div><div id="l1248" class="code_block">incomplete tables that are suspended.
</div><div id="l1249" class="code_block">
</div><div id="l1250" class="code_block">
</div><div id="l1251" class="code_block"><span class="c">%    Entering a break closes all incomplete tables (those which may not have a </span>
</div><div id="l1252" class="code_block"><span class="c">%    complete set of answers).  Closed tables are unaffected, even if </span>
</div><div id="l1253" class="code_block"><span class="c">%    the tables were created during the computation for which the break was</span>
</div><div id="l1254" class="code_block"><span class="c">%    entered.</span>
</div><div id="l1255" class="code_block">
</div><div id="l1256" class="code_block"><span class="k">\isoitem</span><span class="nb">{</span>halt<span class="nb">}{</span>ISO<span class="nb">}{</span>halt/0<span class="nb">}</span>
</div><div id="l1257" class="code_block"><span class="c">%</span>
</div><div id="l1258" class="code_block">    Exits the XSB session regardless of the break level.  On exiting
</div><div id="l1259" class="code_block">    the system cpu and elapsed time information is displayed.
</div><div id="l1260" class="code_block">
</div><div id="l1261" class="code_block"><span class="k">\isoitem</span><span class="nb">{</span>halt(Code)<span class="nb">}{</span>ISO<span class="nb">}{</span>halt/1<span class="nb">}</span>
</div><div id="l1262" class="code_block"><span class="c">%</span>
</div><div id="l1263" class="code_block">Exits the XSB session regardless of the break level, sending the
</div><div id="l1264" class="code_block">integer <span class="nb">{</span><span class="k">\tt</span> Code<span class="nb">}</span> to the parent process.  Normally <span class="nb">{</span><span class="k">\tt</span> 0<span class="nb">}</span> is
</div><div id="l1265" class="code_block">considered to indicate normal termination, while other exit codes are
</div><div id="l1266" class="code_block">used to report various degrees of abnormality.
</div><div id="l1267" class="code_block">
</div><div id="l1268" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Error Cases<span class="nb">}</span>
</div><div id="l1269" class="code_block"><span class="k">\bi</span>
</div><div id="l1270" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> Code<span class="nb">}</span> is not an integer
</div><div id="l1271" class="code_block"><span class="k">\bi</span>
</div><div id="l1272" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> type<span class="k">\_error</span>(Integer,Code)<span class="nb">}</span>
</div><div id="l1273" class="code_block"><span class="k">\ei</span>
</div><div id="l1274" class="code_block"><span class="k">\ei</span>
</div><div id="l1275" class="code_block">
</div><div id="l1276" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>prompt(+NewPrompt, ?OldPrompt)<span class="nb">}{</span>prompt/2<span class="nb">}</span>
</div><div id="l1277" class="code_block">    Sets the prompt of the top level interpreter to <span class="nb">{</span><span class="k">\tt</span> NewPrompt<span class="nb">}</span> and 
</div><div id="l1278" class="code_block">    returns the old prompt in <span class="nb">{</span><span class="k">\tt</span> OldPrompt<span class="nb">}</span>.
</div><div id="l1279" class="code_block">
</div><div id="l1280" class="code_block">    An example of <span class="nb">{</span><span class="k">\tt</span> prompt/2<span class="nb">}</span> &#39;s use is the following:
</div><div id="l1281" class="code_block">
</div><div id="l1282" class="code_block">    <span class="k">\stuff</span><span class="nb">{</span>
</div><div id="l1283" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     | ?- prompt(&#39;Yes master &gt; &#39;, P). <span class="k">\\</span>
</div><div id="l1284" class="code_block">        <span class="k">\\</span>
</div><div id="l1285" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     P = | ?- ; <span class="k">\\</span>
</div><div id="l1286" class="code_block">        <span class="k">\\</span>
</div><div id="l1287" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     no <span class="k">\\</span>
</div><div id="l1288" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     Yes master &gt; fail. <span class="k">\\</span>
</div><div id="l1289" class="code_block">        <span class="k">\\</span>
</div><div id="l1290" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     no <span class="k">\\</span>
</div><div id="l1291" class="code_block">        <span class="k">\&gt;</span>   <span class="k">\&gt;</span>     Yes master &gt;
</div><div id="l1292" class="code_block">    <span class="nb">}</span>
</div><div id="l1293" class="code_block">
</div><div id="l1294" class="code_block"><span class="k">\ourmoditem</span><span class="nb">{</span>trimcore<span class="nb">}{</span>trimcore/0<span class="nb">}{</span>machine<span class="nb">}</span>
</div><div id="l1295" class="code_block"><span class="c">%</span>
</div><div id="l1296" class="code_block">A call to <span class="nb">{</span><span class="k">\tt</span> trimcore/0<span class="nb">}</span> reallocates an XSB thread&#39;s execution
</div><div id="l1297" class="code_block">stacks (and some tabling stacks) to their initial allocation size, the
</div><div id="l1298" class="code_block">action affecting only the memory areas for the calling thread.  When
</div><div id="l1299" class="code_block">XSB is called in standalone or server mode, <span class="nb">{</span><span class="k">\tt</span> trimcore/0<span class="nb">}</span> is
</div><div id="l1300" class="code_block">automatically called when the top interpreter level is reached.  When
</div><div id="l1301" class="code_block">XSB is embedded in a process, <span class="nb">{</span><span class="k">\tt</span> trimcore/0<span class="nb">}</span> is called at the top
</div><div id="l1302" class="code_block">interpreter level for any thread created through
</div><div id="l1303" class="code_block"><span class="nb">{</span><span class="k">\</span> xsb<span class="k">\_ccall\_thread\_create</span>()<span class="nb">}</span> (see Volume 2, Chapter 3 <span class="nb">{</span><span class="k">\em</span>
</div><div id="l1304" class="code_block">  Embedding XSB in a Process<span class="nb">}</span>).
</div><div id="l1305" class="code_block">
</div><div id="l1306" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>gc<span class="k">\_heap</span><span class="nb">}{</span>gc<span class="k">\_heap</span>/0<span class="nb">}</span>
</div><div id="l1307" class="code_block"><span class="k">\index</span><span class="nb">{</span>garbage collection!heap<span class="nb">}</span>
</div><div id="l1308" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prolog flags!<span class="nb">{</span><span class="k">\tt</span> heap<span class="k">\_garbage\_collection</span><span class="nb">}}</span>
</div><div id="l1309" class="code_block"><span class="c">%</span>
</div><div id="l1310" class="code_block">Explicitly invokes the garbage collector for a thread&#39;s heap. By
</div><div id="l1311" class="code_block">default, heap garbage collection is called automatically for each
</div><div id="l1312" class="code_block">thread upon stack expansion, unless the Prolog flag <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l1313" class="code_block">  heap<span class="k">\_garbage\_collection</span><span class="nb">}</span> is set to <span class="nb">{</span><span class="k">\tt</span> none<span class="nb">}</span>.  Automatic heap
</div><div id="l1314" class="code_block">garbage collection should rarely need to be turned off, and should
</div><div id="l1315" class="code_block">rarely need to be invoked manually.
</div><div id="l1316" class="code_block">
</div><div id="l1317" class="code_block"><span class="k">\comment</span><span class="nb">{</span>
</div><div id="l1318" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>garbage<span class="k">\_collection</span>(+Option)<span class="nb">}{</span>garbage<span class="k">\_collection</span>/1<span class="nb">}</span>
</div><div id="l1319" class="code_block">Sets the system so that subsequent heap garbage collecting will be
</div><div id="l1320" class="code_block">done according to the specified <span class="nb">{</span><span class="k">\tt</span> Option<span class="nb">}</span>.  <span class="nb">{</span><span class="k">\tt</span> Option<span class="nb">}</span> may be the
</div><div id="l1321" class="code_block">atom <span class="k">\verb</span>|none| indicating that heap garbage collection is turned
</div><div id="l1322" class="code_block">off; it may be the atom <span class="k">\verb</span>|sliding| indicating that sliding garbage
</div><div id="l1323" class="code_block">collection will be done; the atom <span class="k">\verb</span>|copying| indicating that the
</div><div id="l1324" class="code_block">copying garbage collector will be used; or it may be the atom
</div><div id="l1325" class="code_block"><span class="k">\verb</span>|indirection| indicating that the indirect-sliding garbage
</div><div id="l1326" class="code_block">collector will be used.
</div><div id="l1327" class="code_block"><span class="nb">}</span>
</div><div id="l1328" class="code_block">
</div><div id="l1329" class="code_block"><span class="k">\index</span><span class="nb">{</span>tabling!call subsumption<span class="nb">}</span>
</div><div id="l1330" class="code_block"><span class="k">\index</span><span class="nb">{</span>tabling!call variance<span class="nb">}</span>
</div><div id="l1331" class="code_block"><span class="k">\index</span><span class="nb">{</span>tabling!incremental<span class="nb">}</span>
</div><div id="l1332" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>statistics<span class="nb">}{</span>statistics/0<span class="nb">}</span>
</div><div id="l1333" class="code_block"><span class="c">%</span>
</div><div id="l1334" class="code_block">Displays usage information on the current output stream, including: 
</div><div id="l1335" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span> 
</div><div id="l1336" class="code_block"><span class="k">\item</span> Process-level information about allocated memory excluding
</div><div id="l1337" class="code_block">  execution stacks but including: 
</div><div id="l1338" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1339" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> atoms<span class="nb">}</span> Space used to maintain global information about
</div><div id="l1340" class="code_block">  predicates and structures. 
</div><div id="l1341" class="code_block"><span class="c">%</span>
</div><div id="l1342" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> string<span class="nb">}</span> Space used to maintain information about atomic
</div><div id="l1343" class="code_block">  constants in XSB.
</div><div id="l1344" class="code_block"><span class="c">%</span>
</div><div id="l1345" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> asserted<span class="nb">}</span> Space allocated for dynamic code.
</div><div id="l1346" class="code_block"><span class="c">%</span>
</div><div id="l1347" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> asserted<span class="nb">}</span> Space allocated for static code.
</div><div id="l1348" class="code_block"><span class="c">%</span>
</div><div id="l1349" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> foreign<span class="nb">}</span> Space allocated for foreign predicates.
</div><div id="l1350" class="code_block"><span class="c">%</span>
</div><div id="l1351" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> table<span class="nb">}</span> Space allocated for XSB&#39;s tables.
</div><div id="l1352" class="code_block"><span class="c">%</span>
</div><div id="l1353" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> findall<span class="nb">}</span> Space allocated for buffers to support <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l1354" class="code_block">  findall/3<span class="nb">}</span> and similar predicates.
</div><div id="l1355" class="code_block"><span class="c">%</span>
</div><div id="l1356" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> mt-private<span class="nb">}</span> Private space used by threads.
</div><div id="l1357" class="code_block"><span class="c">%</span>
</div><div id="l1358" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> profiling<span class="nb">}</span> Space used to maintain profiling information, if
</div><div id="l1359" class="code_block">  XSB is called with profiling on.
</div><div id="l1360" class="code_block"><span class="c">%</span>
</div><div id="l1361" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> gc temp<span class="nb">}</span> Temporary space for used for heap garbage
</div><div id="l1362" class="code_block">  collector.
</div><div id="l1363" class="code_block"><span class="c">%</span>
</div><div id="l1364" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> interprolog<span class="nb">}</span> space allocated for the InterProlog XSB/Java
</div><div id="l1365" class="code_block">  interface.
</div><div id="l1366" class="code_block"><span class="c">%</span>
</div><div id="l1367" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> thread<span class="nb">}</span> space allocated for the thread table
</div><div id="l1368" class="code_block"><span class="c">%</span>
</div><div id="l1369" class="code_block"><span class="k">\item</span> the space occupied by subgoal and answer tables (in the form of
</div><div id="l1370" class="code_block">  tries) <span class="k">\cite</span><span class="nb">{</span>RRSSW98,CuSW99b,TST99<span class="nb">}</span>.  In the multi-threaded
</div><div id="l1371" class="code_block">  configuration process level table space includes shared tables but
</div><div id="l1372" class="code_block">  not private tables.
</div><div id="l1373" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1374" class="code_block">
</div><div id="l1375" class="code_block"><span class="k">\item</span> Thread-specific information about allocation of memory
</div><div id="l1376" class="code_block">  for the calling thread including the  
</div><div id="l1377" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span> 
</div><div id="l1378" class="code_block"><span class="k">\item</span> Global stack (heap) and local (environment) stack (see e.g.
</div><div id="l1379" class="code_block">  <span class="k">\cite</span><span class="nb">{</span>AitK90<span class="nb">}</span>) for the calling thread. Memory for these two WAM
</div><div id="l1380" class="code_block">  stacks is allocated as a single unit so that each stack grows
</div><div id="l1381" class="code_block">  together; information is provided on the current allocation for the
</div><div id="l1382" class="code_block">  stacks as well as on the stack sizes themselves.  (See
</div><div id="l1383" class="code_block">  Section~<span class="k">\ref</span><span class="nb">{</span>sec:EmuOptions<span class="nb">}</span> for the memory re-allocation
</div><div id="l1384" class="code_block">  algorithm).  
</div><div id="l1385" class="code_block"><span class="c">%</span>
</div><div id="l1386" class="code_block"><span class="k">\item</span> Trail and choice point stack (see e.g. <span class="k">\cite</span><span class="nb">{</span>AitK90<span class="nb">}</span>) for the
</div><div id="l1387" class="code_block">  calling thread.  Memory for these two WAM stacks is allocated as a
</div><div id="l1388" class="code_block">  single unit so that each stack grows together; information is
</div><div id="l1389" class="code_block">  provided on the current allocation for the stacks as well as on the
</div><div id="l1390" class="code_block">  stack sizes themselves.  The (re-)allocation follows the algorithm
</div><div id="l1391" class="code_block">  sketched in Section~<span class="k">\ref</span><span class="nb">{</span>sec:EmuOptions<span class="nb">}</span>).  (See
</div><div id="l1392" class="code_block">  Section~<span class="k">\ref</span><span class="nb">{</span>sec:EmuOptions<span class="nb">}</span> for the memory re-allocation
</div><div id="l1393" class="code_block">  algorithm).  
</div><div id="l1394" class="code_block"><span class="c">%</span>
</div><div id="l1395" class="code_block"><span class="k">\item</span> SLG unification stack for the calling thread This stack is used
</div><div id="l1396" class="code_block">  as a space to copy terms from the execution stacks into table space,
</div><div id="l1397" class="code_block">  or back out.  This stack will not be reallocated unless extremely
</div><div id="l1398" class="code_block">  large terms are tabled.
</div><div id="l1399" class="code_block"><span class="c">%</span>
</div><div id="l1400" class="code_block"><span class="k">\item</span> SLG completion stack for the calling thread.  The completion
</div><div id="l1401" class="code_block">  stack is used to perform incremental completion for sets of mutually
</div><div id="l1402" class="code_block">  dependent tabled subgoals.  One completion stack frame is allocated
</div><div id="l1403" class="code_block">  per tabled subgoal <span class="k">\cite</span><span class="nb">{</span>SaSw98<span class="nb">}</span> but the size of these frames is
</div><div id="l1404" class="code_block">  version-dependent.
</div><div id="l1405" class="code_block"><span class="c">%</span>
</div><div id="l1406" class="code_block"><span class="k">\item</span> the space occupied by private subgoal and answer tables for the
</div><div id="l1407" class="code_block">  calling thread. 
</div><div id="l1408" class="code_block">
</div><div id="l1409" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1410" class="code_block">In XSB&#39;s single-threaded configuration, maximum space used by each of
</div><div id="l1411" class="code_block">will be output if the <span class="nb">{</span><span class="k">\tt</span> &#39;-s&#39;<span class="nb">}</span> command-line option is used
</div><div id="l1412" class="code_block">
</div><div id="l1413" class="code_block"><span class="k">\item</span> Information about the number of tabling operations performed in
</div><div id="l1414" class="code_block">  the session by any thread.  Note that the statistics are divided up
</div><div id="l1415" class="code_block">  between calls to predicates that use variant tabling and those that
</div><div id="l1416" class="code_block">  use (call) subsumptive tabling (see
</div><div id="l1417" class="code_block">  Section~<span class="k">\ref</span><span class="nb">{</span>sec:SimilarityMeasures<span class="nb">}</span> and <span class="k">\cite</span><span class="nb">{</span>TST99<span class="nb">}</span>).
</div><div id="l1418" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1419" class="code_block"><span class="k">\item</span> Call Subsumption Subgoal Operations.  For predicates that use
</div><div id="l1420" class="code_block">subsumptive tabling, the total number of subsumptive subgoal calls is
</div><div id="l1421" class="code_block">given, as is the number of new calls (<span class="nb">{</span><span class="k">\tt</span> producers<span class="nb">}</span>) and the number
</div><div id="l1422" class="code_block">of repeated calls to non-completed tables (<span class="nb">{</span><span class="k">\tt</span> variants<span class="nb">}</span>).
</div><div id="l1423" class="code_block">Furthermore, the number of properly subsumed calls to incomplete
</div><div id="l1424" class="code_block">tables is given, along with the number of subsumed calls to completed
</div><div id="l1425" class="code_block">tables.  Finally, the total number of subsumptive table entries
</div><div id="l1426" class="code_block">overall is given, including all producer and consumer calls.
</div><div id="l1427" class="code_block"><span class="c">%</span>
</div><div id="l1428" class="code_block"><span class="k">\item</span> Call Subsumption Answer Operations.  In call subsumptive
</div><div id="l1429" class="code_block">tabling, answer lists are copied from producer subgoals to subsumed
</div><div id="l1430" class="code_block">consumer subgoals (this operation is not required in variant tabling).
</div><div id="l1431" class="code_block">The number of <span class="nb">{</span><span class="k">\tt</span> answer ident<span class="nb">}</span> operations represents the number of
</div><div id="l1432" class="code_block">times this copy is done.  In addition, the number of consumptions
</div><div id="l1433" class="code_block">performed by all consuming subsumptive table entries is also given.
</div><div id="l1434" class="code_block"><span class="c">%</span>
</div><div id="l1435" class="code_block"><span class="k">\item</span> Call Variance Subgoal Operations.  For call variance the number
</div><div id="l1436" class="code_block">of subgoal check/insert operations is given along with the unique
</div><div id="l1437" class="code_block">number of subgoals encountered (<span class="nb">{</span><span class="k">\tt</span> generator<span class="nb">}</span>) and the number of
</div><div id="l1438" class="code_block">redundant consumer encountered (<span class="nb">{</span><span class="k">\tt</span> consumer<span class="nb">}</span>).
</div><div id="l1439" class="code_block"><span class="c">%</span>
</div><div id="l1440" class="code_block"><span class="k">\item</span> Total Answer Operations.  For both variant and subsumptive
</div><div id="l1441" class="code_block">tables, the number of answer check insert operations is given along
</div><div id="l1442" class="code_block">with the number of answers actually inserted into the table and the
</div><div id="l1443" class="code_block">number of redundant answers derived.
</div><div id="l1444" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1445" class="code_block"><span class="c">%</span>
</div><div id="l1446" class="code_block"><span class="k">\item</span> Garbage Collection Information.  Time spent garbage collecting
</div><div id="l1447" class="code_block">  by the calling thread and number of heap cells collected.
</div><div id="l1448" class="code_block">
</div><div id="l1449" class="code_block"><span class="k">\item</span> Information about process CPU and clock time, as well as the
</div><div id="l1450" class="code_block">  number of active threads.
</div><div id="l1451" class="code_block">    <span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1452" class="code_block">
</div><div id="l1453" class="code_block">As mentioned above, if XSB is configured with the single-threaded
</div><div id="l1454" class="code_block">engine and is invoked with the <span class="nb">{</span><span class="k">\tt</span> &#39;-s&#39;<span class="nb">}</span> option (see
</div><div id="l1455" class="code_block">Section~<span class="k">\ref</span><span class="nb">{</span>sec:EmuOptions<span class="nb">}</span>), additional information is printed out
</div><div id="l1456" class="code_block">about maximum use of each execution stack and table space.  However,
</div><div id="l1457" class="code_block">the <span class="nb">{</span><span class="k">\tt</span> &#39;-s&#39;<span class="nb">}</span> option can substantially slow down the emulator so
</div><div id="l1458" class="code_block">benchmarks of time should be performed separately from benchmarks of
</div><div id="l1459" class="code_block">space.
</div><div id="l1460" class="code_block">
</div><div id="l1461" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Example<span class="nb">}</span>: The following printout shows how the <span class="nb">{</span><span class="k">\tt</span> statistics/0<span class="nb">}</span>
</div><div id="l1462" class="code_block">output looks if it is invoked with the <span class="nb">{</span><span class="k">\tt</span> &#39;-s&#39;<span class="nb">}</span> option (without it
</div><div id="l1463" class="code_block">the <span class="nb">{</span><span class="k">\tt</span> Maximum stack used<span class="nb">}</span>, and <span class="nb">{</span><span class="k">\tt</span> Maximum table space used<span class="nb">}</span> lines
</div><div id="l1464" class="code_block">are not shown).  Information about the allocation size is provided
</div><div id="l1465" class="code_block">since the sizes can be changed through emulator options (see
</div><div id="l1466" class="code_block">Section~<span class="k">\ref</span><span class="nb">{</span>sec:EmuOptions<span class="nb">}</span>).
</div><div id="l1467" class="code_block">
</div><div id="l1468" class="code_block">    <span class="nb">{</span><span class="k">\footnotesize</span>
</div><div id="l1469" class="code_block">     <span class="k">\begin</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l1470" class="code_block">| ?- statistics.
</div><div id="l1471" class="code_block">Memory (total)         2429504 bytes:       726696 in use,      1702808 free
</div><div id="l1472" class="code_block">  permanent space       645520 bytes:       645520 in use,            0 free
</div><div id="l1473" class="code_block">    atom                                    120328
</div><div id="l1474" class="code_block">    string                                  156872
</div><div id="l1475" class="code_block">    asserted                                  3184
</div><div id="l1476" class="code_block">    compiled                                358216
</div><div id="l1477" class="code_block">    other                                     6920
</div><div id="l1478" class="code_block">  glob/loc space        786432 bytes:          652 in use,       785780 free
</div><div id="l1479" class="code_block">    global                                     456 bytes
</div><div id="l1480" class="code_block">    local                                      196 bytes
</div><div id="l1481" class="code_block">  trail/cp space        786432 bytes:          476 in use,       785956 free
</div><div id="l1482" class="code_block">    trail                                       88 bytes
</div><div id="l1483" class="code_block">    choice point                               388 bytes
</div><div id="l1484" class="code_block">  SLG unific. space      65536 bytes:            0 in use,        65536 free
</div><div id="l1485" class="code_block">  SLG completion         65536 bytes:            0 in use,        65536 free
</div><div id="l1486" class="code_block">  SLG table space        80048 bytes:        80048 in use,            0 free
</div><div id="l1487" class="code_block">
</div><div id="l1488" class="code_block">  Maximum stack used: global 436724, local 14780, trail 27304, cp 20292,
</div><div id="l1489" class="code_block">                      SLG completion 0 (0 subgoals)
</div><div id="l1490" class="code_block">  Maximum table space used:  0 bytes
</div><div id="l1491" class="code_block">
</div><div id="l1492" class="code_block">Tabling Operations
</div><div id="l1493" class="code_block">  0 subsumptive call check/insert ops: 0 producers, 0 variants,
</div><div id="l1494" class="code_block">  0 properly subsumed (0 table entries), 0 used completed table.
</div><div id="l1495" class="code_block">  0 relevant answer ident ops.  0 consumptions via answer list.
</div><div id="l1496" class="code_block">  0 variant call check/insert ops: 0 producers, 0 variants.
</div><div id="l1497" class="code_block">  0 answer check/insert ops: 0 unique inserts, 0 redundant.
</div><div id="l1498" class="code_block">
</div><div id="l1499" class="code_block">
</div><div id="l1500" class="code_block">   0 heap (  0 string) garbage collections by copying: collected 0 cells in 0.000000 secs
</div><div id="l1501" class="code_block">
</div><div id="l1502" class="code_block">Time: 0.190 sec. cputime,  13.921 sec. elapsetime
</div><div id="l1503" class="code_block"><span class="k">\end</span><span class="nb">{</span>verbatim<span class="nb">}}</span> 
</div><div id="l1504" class="code_block">
</div><div id="l1505" class="code_block"><span class="c">%===================</span>
</div><div id="l1506" class="code_block">
</div><div id="l1507" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>statistics(+Key)<span class="nb">}{</span>statistics/1<span class="nb">}</span>
</div><div id="l1508" class="code_block"><span class="c">%</span>
</div><div id="l1509" class="code_block"><span class="nb">{</span><span class="k">\tt</span> statistics/1<span class="nb">}</span> allows the user to output detailed statistical
</div><div id="l1510" class="code_block">information about the atom and symbol tables, as well as about table
</div><div id="l1511" class="code_block">space.  The following calls to <span class="nb">{</span><span class="k">\tt</span> statistics/1<span class="nb">}</span> are supported:
</div><div id="l1512" class="code_block"><span class="c">%</span>
</div><div id="l1513" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1514" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> statistics(reset)<span class="nb">}</span>  Resets the CPU time as well as counts
</div><div id="l1515" class="code_block">for various tabling operations. 
</div><div id="l1516" class="code_block"><span class="c">%</span>
</div><div id="l1517" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> statistics(atom)<span class="nb">}</span> Outputs statistics about both the atom
</div><div id="l1518" class="code_block">and symbol tables.  An example is: 
</div><div id="l1519" class="code_block"><span class="c">%</span>
</div><div id="l1520" class="code_block"><span class="nb">{</span><span class="k">\footnotesize</span>
</div><div id="l1521" class="code_block"><span class="k">\begin</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l1522" class="code_block">| ?- statistics(atom).
</div><div id="l1523" class="code_block">
</div><div id="l1524" class="code_block">Symbol table statistics:
</div><div id="l1525" class="code_block">------------------------
</div><div id="l1526" class="code_block">Table Size:	8191
</div><div id="l1527" class="code_block">Total Symbols:	1188
</div><div id="l1528" class="code_block">            used buckets:              1088  (range: [0, 8174])
</div><div id="l1529" class="code_block">            unused buckets:            7103
</div><div id="l1530" class="code_block">            maximum bucket size:       3  (#: 18)
</div><div id="l1531" class="code_block">
</div><div id="l1532" class="code_block">String table statistics:
</div><div id="l1533" class="code_block">------------------------
</div><div id="l1534" class="code_block">Table Size:	16381
</div><div id="l1535" class="code_block">Total Strings:	1702
</div><div id="l1536" class="code_block">            used buckets:              1598  (range: [0, 16373])
</div><div id="l1537" class="code_block">            unused buckets:            14783
</div><div id="l1538" class="code_block">            maximum bucket size:       3  (#: 2318)
</div><div id="l1539" class="code_block"><span class="k">\end</span><span class="nb">{</span>verbatim<span class="nb">}}</span>
</div><div id="l1540" class="code_block"><span class="c">%</span>
</div><div id="l1541" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> statistics(table)<span class="nb">}</span> Outputs <span class="nb">{</span><span class="k">\em</span> very<span class="nb">}</span> detailed statistics
</div><div id="l1542" class="code_block">  about table space, including breakdowns into variant and subsumptive
</div><div id="l1543" class="code_block">  call- and answer- trie nodes and hash tables; answer return list
</div><div id="l1544" class="code_block">  nodes, and structures for conditional answers (cf. <span class="k">\cite</span><span class="nb">{</span>SaSw98,
</div><div id="l1545" class="code_block">    RRSSW98, TST99, CuSW99a<span class="nb">}</span>).  In the multi-threaded engine, these
</div><div id="l1546" class="code_block">  data structures are reported both for shared tables and for private
</div><div id="l1547" class="code_block">  tables of the calling thread.
</div><div id="l1548" class="code_block">
</div><div id="l1549" class="code_block">  While this option is intended primarily for developers, it can also
</div><div id="l1550" class="code_block">  provide valuable information for the serious user of tabling.
</div><div id="l1551" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1552" class="code_block">
</div><div id="l1553" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Error Cases<span class="nb">}</span>
</div><div id="l1554" class="code_block"><span class="k">\bi</span>
</div><div id="l1555" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> Key<span class="nb">}</span> not a valid atom for input to <span class="nb">{</span><span class="k">\tt</span> statistics/1<span class="nb">}</span> 
</div><div id="l1556" class="code_block"><span class="k">\bi</span>
</div><div id="l1557" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> domain<span class="k">\_error</span>(statisticsInputDomain,Key))<span class="nb">}</span>
</div><div id="l1558" class="code_block"><span class="k">\ei</span>
</div><div id="l1559" class="code_block"><span class="k">\ei</span>
</div><div id="l1560" class="code_block">
</div><div id="l1561" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>statistics(?Key,-Result)<span class="nb">}{</span>statistics/2<span class="nb">}</span>
</div><div id="l1562" class="code_block"><span class="c">%</span>
</div><div id="l1563" class="code_block"><span class="nb">{</span><span class="k">\tt</span> statistics/2<span class="nb">}</span> allows a user to determine information about
</div><div id="l1564" class="code_block">resources used by XSB.  Currently <span class="nb">{</span><span class="k">\tt</span> statistics/2<span class="nb">}</span> unifies <span class="nb">{</span><span class="k">\tt</span> Key<span class="nb">}</span>
</div><div id="l1565" class="code_block">with
</div><div id="l1566" class="code_block"><span class="k">\bi</span>
</div><div id="l1567" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> runtime<span class="nb">}</span>, which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the structure
</div><div id="l1568" class="code_block">  <span class="nb">{</span><span class="k">\tt</span> [TotalCPU,IncrCPU]<span class="nb">}</span> where <span class="nb">{</span><span class="k">\tt</span> TotalCPU<span class="nb">}</span> is the total
</div><div id="l1569" class="code_block">  (process-level) CPU time at the time of call, and <span class="nb">{</span><span class="k">\tt</span> IncrCPU<span class="nb">}</span> is
</div><div id="l1570" class="code_block">  the CPU time taken since the last call to <span class="nb">{</span><span class="k">\tt</span> statistics/2<span class="nb">}</span>.  Times
</div><div id="l1571" class="code_block">  are measured in seconds.  The process-level CPU time includes time
</div><div id="l1572" class="code_block">  taken for system calls, as well as time taken for garbage collection
</div><div id="l1573" class="code_block">  and stack-shifting.  Note that in the multi-threaded engine,
</div><div id="l1574" class="code_block">  <span class="nb">{</span><span class="k">\tt</span> statistics/2<span class="nb">}</span> measures the time for all threads.
</div><div id="l1575" class="code_block"><span class="c">%</span>
</div><div id="l1576" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> walltime<span class="nb">}</span>, which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the list <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l1577" class="code_block"> [TotalTime,IncrTime]<span class="nb">}</span> where <span class="nb">{</span><span class="k">\tt</span> TotalTime<span class="nb">}</span> is the total elapsed time
</div><div id="l1578" class="code_block"> at the time of call, and <span class="nb">{</span><span class="k">\tt</span> IncrTime<span class="nb">}</span> is the elapsed time taken
</div><div id="l1579" class="code_block"> since the last call to <span class="nb">{</span><span class="k">\tt</span> statistics/2<span class="nb">}</span>.  Times are measured in
</div><div id="l1580" class="code_block"> seconds.
</div><div id="l1581" class="code_block"><span class="c">%</span>
</div><div id="l1582" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> total<span class="k">\_memory</span><span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the list
</div><div id="l1583" class="code_block"> <span class="nb">{</span><span class="k">\tt</span> [Alloc,Used]<span class="nb">}</span>.  In the single-threaded engine, <span class="nb">{</span><span class="k">\tt</span> Alloc<span class="nb">}</span> is
</div><div id="l1584" class="code_block"> the total table space allocated and <span class="nb">{</span><span class="k">\tt</span> Used<span class="nb">}</span> is the total table
</div><div id="l1585" class="code_block"> space used, both in bytes.  In the multi-threaded engine, both refer
</div><div id="l1586" class="code_block"> to table space <span class="nb">{</span><span class="k">\em</span> private<span class="nb">}</span> to the calling thread.
</div><div id="l1587" class="code_block"><span class="c">%</span>
</div><div id="l1588" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> tablespace<span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the list <span class="nb">{</span><span class="k">\tt</span>
</div><div id="l1589" class="code_block"> [Alloc,Used]<span class="nb">}</span>.  In the single-threaded engine, <span class="nb">{</span><span class="k">\tt</span> Alloc<span class="nb">}</span> is the
</div><div id="l1590" class="code_block"> total table space allocated and <span class="nb">{</span><span class="k">\tt</span> Used<span class="nb">}</span> is the total table space
</div><div id="l1591" class="code_block"> used, both in bytes.  In the multi-threaded engine, both refer to
</div><div id="l1592" class="code_block"> table space <span class="nb">{</span><span class="k">\em</span> private<span class="nb">}</span> to the calling thread.
</div><div id="l1593" class="code_block"><span class="c">%</span>
</div><div id="l1594" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> shared<span class="k">\_tablespace</span><span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the
</div><div id="l1595" class="code_block"> list <span class="nb">{</span><span class="k">\tt</span> [Alloc,Used]<span class="nb">}</span>.  In the multi-threaded engine, <span class="nb">{</span><span class="k">\tt</span> Alloc<span class="nb">}</span>
</div><div id="l1596" class="code_block"> is the total space allocated for <span class="nb">{</span><span class="k">\em</span> shared<span class="nb">}</span> tables and <span class="nb">{</span><span class="k">\tt</span> Used<span class="nb">}</span>
</div><div id="l1597" class="code_block"> is the total table space used, both in bytes.  An error is thrown if
</div><div id="l1598" class="code_block"> this option is called by the single-threaded engine.
</div><div id="l1599" class="code_block"><span class="c">%</span>
</div><div id="l1600" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> trie<span class="k">\_assert</span><span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the list
</div><div id="l1601" class="code_block"> <span class="nb">{</span><span class="k">\tt</span> [Alloc,Used]<span class="nb">}</span>.  In the single-threaded engine, <span class="nb">{</span><span class="k">\tt</span> Alloc<span class="nb">}</span> is
</div><div id="l1602" class="code_block"> the total space allocated for trie-asserted facts and interned tries;
</div><div id="l1603" class="code_block"> <span class="nb">{</span><span class="k">\tt</span> Used<span class="nb">}</span> is the total space used for these purposes, both in bytes.
</div><div id="l1604" class="code_block"><span class="c">%</span>
</div><div id="l1605" class="code_block"><span class="c">%\item {\tt gl} which instantiates {\tt Result} to the list {\tt</span>
</div><div id="l1606" class="code_block"><span class="c">% [Alloc,Used]}, where {\tt Alloc} is the total number of bytes</span>
</div><div id="l1607" class="code_block"><span class="c">% allocated for XSB&#39;s combined heap and local (environment) stack,</span>
</div><div id="l1608" class="code_block"><span class="c">% while {\tt Used} is the approximate number of bytes used by both of</span>
</div><div id="l1609" class="code_block"><span class="c">% these stacks.  In the multi-threaded engine, these numbers refer only</span>
</div><div id="l1610" class="code_block"><span class="c">% to the stacks of the calling thread.</span>
</div><div id="l1611" class="code_block"><span class="c">%</span>
</div><div id="l1612" class="code_block"><span class="c">%\item {\tt tc} which instantiates {\tt Result} to the list {\tt</span>
</div><div id="l1613" class="code_block"><span class="c">% [Alloc,Used]}, where {\tt Alloc} is the total number of bytes</span>
</div><div id="l1614" class="code_block"><span class="c">% allocated for XSB&#39;s combined trail and choice point stack while {\tt</span>
</div><div id="l1615" class="code_block"><span class="c">% Used} is the number of bytes used by both of these stacks.  In the</span>
</div><div id="l1616" class="code_block"><span class="c">%% multi-threaded engine, these numbers refer only to the stacks of the</span>
</div><div id="l1617" class="code_block"><span class="c">% calling thread.</span>
</div><div id="l1618" class="code_block"><span class="c">%</span>
</div><div id="l1619" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> heap<span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the total number
</div><div id="l1620" class="code_block"> of bytes used by XSB&#39;s heap.  In the multi-threaded engine, the
</div><div id="l1621" class="code_block"> number refers only to the heap of the calling thread.
</div><div id="l1622" class="code_block"><span class="c">%</span>
</div><div id="l1623" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> local<span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the total number
</div><div id="l1624" class="code_block"> of bytes used by XSB&#39;s local (environment) stack.  In the
</div><div id="l1625" class="code_block"> multi-threaded engine, the number refers only to the local stack of
</div><div id="l1626" class="code_block"> the calling thread.
</div><div id="l1627" class="code_block"><span class="c">%</span>
</div><div id="l1628" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> trail<span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the total number
</div><div id="l1629" class="code_block"> of bytes used by XSB&#39;s trail stack.  In the multi-threaded engine,
</div><div id="l1630" class="code_block"> the number refers only to the trail stack of the calling thread.
</div><div id="l1631" class="code_block"><span class="c">%</span>
</div><div id="l1632" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> choice<span class="k">\_point</span><span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the total
</div><div id="l1633" class="code_block"> number of bytes used by XSB&#39;s choice point stack.  In the
</div><div id="l1634" class="code_block"> multi-threaded engine, the number refers only to the choice point
</div><div id="l1635" class="code_block"> stack of the calling thread.
</div><div id="l1636" class="code_block"><span class="c">%</span>
</div><div id="l1637" class="code_block"><span class="k">\index</span><span class="nb">{</span>tabled subgoals!incomplete<span class="nb">}</span>
</div><div id="l1638" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> incomplete<span class="k">\_tables</span><span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to a
</div><div id="l1639" class="code_block"> list containing the following elements (in order):-
</div><div id="l1640" class="code_block"><span class="k">\bi</span>
</div><div id="l1641" class="code_block"><span class="k">\item</span> The number of incomplete tables in XSB&#39;s completion stack, i.e.,
</div><div id="l1642" class="code_block"> the number of subgoals currently under evaluation.
</div><div id="l1643" class="code_block"><span class="c">%</span>
</div><div id="l1644" class="code_block"><span class="k">\item</span> The number of SCCs currently under evaluation in XSB&#39;s
</div><div id="l1645" class="code_block"> completion stack.  
</div><div id="l1646" class="code_block"><span class="k">\ei</span> 
</div><div id="l1647" class="code_block">In the multi-threaded engine, both of these numbers refer to the
</div><div id="l1648" class="code_block"> completion stack of the calling thread, which may contain both
</div><div id="l1649" class="code_block"> thread-private and thread-shared tables.
</div><div id="l1650" class="code_block"><span class="c">%</span>
</div><div id="l1651" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> atoms<span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to the number of
</div><div id="l1652" class="code_block"> bytes taken by atoms in the atom table.
</div><div id="l1653" class="code_block"><span class="c">%</span>
</div><div id="l1654" class="code_block"><span class="k">\index</span><span class="nb">{</span>Incremental Dependency Graph (IDG)<span class="nb">}</span>
</div><div id="l1655" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> idg<span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to a a list containing
</div><div id="l1656" class="code_block"> (in order) the number of nodes and the number of edges currently in
</div><div id="l1657" class="code_block"> the incremental dependency graph (IDG).
</div><div id="l1658" class="code_block"><span class="c">%</span>
</div><div id="l1659" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> table<span class="k">\_ops</span><span class="nb">}</span> which instantiates <span class="nb">{</span><span class="k">\tt</span> Result<span class="nb">}</span> to a list
</div><div id="l1660" class="code_block"> containing the following elements (in order):
</div><div id="l1661" class="code_block"><span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1662" class="code_block"><span class="k">\item</span> The total number of check/insert operations for tables using call subsumption.
</div><div id="l1663" class="code_block">
</div><div id="l1664" class="code_block"><span class="k">\item</span> The number of distinct tables created for tables using call subsumption.
</div><div id="l1665" class="code_block">
</div><div id="l1666" class="code_block"><span class="k">\item</span> The total number of check/insert operations for tables using call variance.
</div><div id="l1667" class="code_block">
</div><div id="l1668" class="code_block"><span class="k">\item</span> The number of distinct tables created for tables using call variance.
</div><div id="l1669" class="code_block">
</div><div id="l1670" class="code_block"><span class="k">\item</span> The total number of check/insert operations for all answers
</div><div id="l1671" class="code_block"> (whether they are in subsumptive or variant tables).
</div><div id="l1672" class="code_block">
</div><div id="l1673" class="code_block"><span class="k">\item</span> The number of distinct answers added (whether they are in
</div><div id="l1674" class="code_block"> subsumptive or variant tables).
</div><div id="l1675" class="code_block"><span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>
</div><div id="l1676" class="code_block"><span class="c">%</span>
</div><div id="l1677" class="code_block"><span class="k">\ei</span>
</div><div id="l1678" class="code_block">
</div><div id="l1679" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Example<span class="nb">}</span>
</div><div id="l1680" class="code_block">An example of using <span class="nb">{</span><span class="k">\tt</span> statistics/2<span class="nb">}</span> to check CPU time is as follows:
</div><div id="l1681" class="code_block">
</div><div id="l1682" class="code_block"><span class="k">\begin</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l1683" class="code_block">?- statistics(runtime,[BeforeCumu,BeforeIncr]),spin(100000000),
</div><div id="l1684" class="code_block">   statistics(runtime,[AfterCumu,AfterIncr]).
</div><div id="l1685" class="code_block">
</div><div id="l1686" class="code_block">BeforeCumu = 5.0167
</div><div id="l1687" class="code_block">BeforeIncr = 5.0167
</div><div id="l1688" class="code_block">AfterCumu = 9.6498
</div><div id="l1689" class="code_block">AfterIncr = 4.6331
</div><div id="l1690" class="code_block"><span class="k">\end</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l1691" class="code_block">Note that <span class="nb">{</span><span class="k">\tt</span> statistics/2<span class="nb">}</span> can provide either cumulative or
</div><div id="l1692" class="code_block"> incremental times; here
</div><div id="l1693" class="code_block"><span class="sb">\[</span>
</div><div id="l1694" class="code_block"><span class="nb"> AfterCumu </span><span class="o">-</span><span class="nb"> BeforeCumu </span><span class="o">=</span><span class="nb"> AfterIncr</span>
</div><div id="l1695" class="code_block"><span class="s">\]</span>
</div><div id="l1696" class="code_block">Checking wall time is done similarly.
</div><div id="l1697" class="code_block"><span class="k">\begin</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l1698" class="code_block">?- statistics(walltime,Before),sleep(1),statistics(walltime,After).
</div><div id="l1699" class="code_block">
</div><div id="l1700" class="code_block">Before = [35.0651,35.0651]
</div><div id="l1701" class="code_block">After = [36.0652,1.0001]
</div><div id="l1702" class="code_block"><span class="k">\end</span><span class="nb">{</span>verbatim<span class="nb">}</span>
</div><div id="l1703" class="code_block">
</div><div id="l1704" class="code_block"><span class="nb">{</span><span class="k">\bf</span> Error Cases<span class="nb">}</span>
</div><div id="l1705" class="code_block"><span class="k">\bi</span>
</div><div id="l1706" class="code_block"><span class="k">\item</span> <span class="nb">{</span><span class="k">\tt</span> Key<span class="nb">}</span> not a valid atom for input to <span class="nb">{</span><span class="k">\tt</span> statistics/1<span class="nb">}</span> 
</div><div id="l1707" class="code_block"><span class="k">\bi</span>
</div><div id="l1708" class="code_block"><span class="k">\item</span> 	<span class="nb">{</span><span class="k">\tt</span> domain<span class="k">\_error</span>(statisticsInputDomain,Key))<span class="nb">}</span>
</div><div id="l1709" class="code_block"><span class="k">\ei</span>
</div><div id="l1710" class="code_block"><span class="k">\ei</span>
</div><div id="l1711" class="code_block"><span class="k">\comment</span><span class="nb">{</span> 
</div><div id="l1712" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>cputime(-CPU<span class="k">\_Time</span>)<span class="nb">}{</span>cputime/1<span class="nb">}</span>
</div><div id="l1713" class="code_block"><span class="c">%</span>
</div><div id="l1714" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>walltime(-Time)<span class="nb">}{</span>cputime/1<span class="nb">}</span>
</div><div id="l1715" class="code_block"><span class="c">%</span>
</div><div id="l1716" class="code_block">Returns the <span class="k">\texttt</span><span class="nb">{</span>Time<span class="nb">}</span>, in seconds, since execution started, or
</div><div id="l1717" class="code_block">since the last call to <span class="k">\texttt</span><span class="nb">{</span>statistics(0)<span class="nb">}</span> by any thread.
</div><div id="l1718" class="code_block">
</div><div id="l1719" class="code_block">Returns the (process-level) <span class="nb">{</span><span class="k">\tt</span> CPU<span class="k">\_Time</span><span class="nb">}</span> at the time of the call in
</div><div id="l1720" class="code_block">seconds.  The difference between results of successive calls to this
</div><div id="l1721" class="code_block">predicate can measure the time spent in specific predicates.  Note
</div><div id="l1722" class="code_block">that in the multi-threaded engine, <span class="nb">{</span>cputime/1<span class="nb">}</span> measures the time for
</div><div id="l1723" class="code_block">all threads.
</div><div id="l1724" class="code_block">
</div><div id="l1725" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>walltime(-Time)<span class="nb">}{</span>cputime/1<span class="nb">}</span>
</div><div id="l1726" class="code_block"><span class="c">%</span>
</div><div id="l1727" class="code_block">Returns the <span class="k">\texttt</span><span class="nb">{</span>Time<span class="nb">}</span>, in seconds, since execution started, or
</div><div id="l1728" class="code_block">since the last call to <span class="k">\texttt</span><span class="nb">{</span>statistics(0)<span class="nb">}</span> by any thread.
</div><div id="l1729" class="code_block"><span class="nb">}</span>
</div><div id="l1730" class="code_block">
</div><div id="l1731" class="code_block"><span class="k">\standarditem</span><span class="nb">{</span>time(+Goal)<span class="nb">}{</span>time/1<span class="nb">}</span>
</div><div id="l1732" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prologs!SWI<span class="nb">}</span>
</div><div id="l1733" class="code_block"><span class="k">\index</span><span class="nb">{</span>Prologs!YAP<span class="nb">}</span>
</div><div id="l1734" class="code_block"><span class="c">%</span>
</div><div id="l1735" class="code_block">Prints both the CPU time and wall time taken by the execution of <span class="k">\texttt</span><span class="nb">{</span>Goal<span class="nb">}</span>.
</div><div id="l1736" class="code_block">Any choice-points of <span class="k">\texttt</span><span class="nb">{</span>Goal<span class="nb">}</span> are discarded. The definition of predicate is based 
</div><div id="l1737" class="code_block">on the SWI-Prolog definition (minus reporting the number of inferences, which XSB does 
</div><div id="l1738" class="code_block">not currently support). This predicate is also found on other Prolog compilers such as YAP.
</div><div id="l1739" class="code_block">
</div><div id="l1740" class="code_block"><span class="k">\end</span><span class="nb">{</span>description<span class="nb">}</span>
</div><div id="l1741" class="code_block">
</div><div id="l1742" class="code_block"><span class="c">%need op (just so we dont forget ???</span>
</div><div id="l1743" class="code_block">
</div><div id="l1744" class="code_block">
</div><div id="l1745" class="code_block"><span class="c">%=====================================================================</span>
</div></pre></div></td></tr></table></div>

      
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