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<div class="ChapSects"><a href="chap37.html#X85B21D56816A1B39">37 <span class="Heading"> Parallel Computation - Extra Functions</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap37.html#X7CFDEEC07F15CF82">37.1 <span class="Heading">  </span></a>
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap37.html#X85B7FC0981118357">37.1-1 ChildFunction</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap37.html#X8185936D86B71BE8">37.1-2 ChildRead</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap37.html#X8087495582FCF2AD">37.1-3 ChildReadEval</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap37.html#X7F7F210580378FFF">37.1-4 ParallelList</a></span>
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<h3>37 <span class="Heading"> Parallel Computation - Extra Functions</span></h3>

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<h4>37.1 <span class="Heading">  </span></h4>

<p><a id="X85B7FC0981118357" name="X85B7FC0981118357"></a></p>

<h5>37.1-1 ChildFunction</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ChildFunction</code>( <var class="Arg">str</var>, <var class="Arg">s</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This runs the GAP function <span class="SimpleMath">str</span>="function(arg);" on a child process accessed by the stream s. The output from "func;" can be accessed via the stream.</p>

<p><strong class="button">Examples:</strong></p>

<p><a id="X8185936D86B71BE8" name="X8185936D86B71BE8"></a></p>

<h5>37.1-2 ChildRead</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ChildRead</code>( <var class="Arg">s</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This returns, as a string, the output of the last application of <span class="SimpleMath">ChildFunction("function(arg);",s)</span>.</p>

<p><strong class="button">Examples:</strong></p>

<p><a id="X8087495582FCF2AD" name="X8087495582FCF2AD"></a></p>

<h5>37.1-3 ChildReadEval</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ChildReadEval</code>( <var class="Arg">s</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This returns, as an evaluated string, the output of the last application of <span class="SimpleMath">ChildFunction("function(arg);",s)</span>.</p>

<p><strong class="button">Examples:</strong></p>

<p><a id="X7F7F210580378FFF" name="X7F7F210580378FFF"></a></p>

<h5>37.1-4 ParallelList</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ParallelList</code>( <var class="Arg">I</var>, <var class="Arg">fn</var>, <var class="Arg">L</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Inputs a list <span class="SimpleMath">I</span>, a function <span class="SimpleMath">fn</span> such that <span class="SimpleMath">fn(x)</span> is defined for all <span class="SimpleMath">x</span> in <span class="SimpleMath">I</span>, and a list of children <span class="SimpleMath">L</span>. It uses the children in <span class="SimpleMath">L</span> to compute <span class="SimpleMath">List(I,x->fn(x))</span>. (Obviously the function <span class="SimpleMath">fn</span> must be defined on all child processes in <span class="SimpleMath">L</span>.)</p>

<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>


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