parallel.future.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->

<reference xml:id="class.parallel-future" role="class" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">

 <title>The parallel\Future class</title>
 <titleabbrev>parallel\Future</titleabbrev>

 <partintro>

  <section>
    <title>Futures</title>
    <para>
     A Future represents the return value or uncaught exception from a task, and exposes an API for cancellation.
    </para>
     <example>
      <title>Example showing Future as return value</title>
      <programlisting role="php">
<![CDATA[
<?php
$runtime = new \parallel\Runtime;
$future  = $runtime->run(function(){
    return "World";
});
printf("Hello %s\n", $future->value());
?>
]]>
      </programlisting>
      &example.outputs.similar;
      <screen>
<![CDATA[
Hello World
]]>
      </screen>
     </example>
    <para>
     The behaviour of a future also allows it to be used as a simple synchronization point even where the task does not return a value explicitly.
    </para>
     <example>
      <title>Example showing Future as synchronization point</title>
      <programlisting role="php">
<![CDATA[
<?php
$runtime = new \parallel\Runtime;
$future  = $runtime->run(function(){
    echo "in child ";
    for ($i = 0; $i < 500; $i++) {
        if ($i % 10 == 0) {
            echo ".";
        }
    }
    echo " leaving child";
});

$future->value();
echo "\nparent continues\n";
?>
]]>
      </programlisting>
      &example.outputs.similar;
      <screen>
<![CDATA[
in child .................................................. leaving child
parent continues
]]>
      </screen>
     </example>    
  </section>

  <section xml:id="parallel-future.synopsis">
   &reftitle.classsynopsis;

<!-- {{{ Synopsis -->
   <classsynopsis>
    <ooclass><classname>parallel\Future</classname></ooclass>

<!-- {{{ Class synopsis -->
    <classsynopsisinfo>
     <ooclass>
      <modifier>final</modifier>
      <classname>parallel\Future</classname>
     </ooclass>
    </classsynopsisinfo>
<!-- }}} -->
   
    <classsynopsisinfo role="comment">Resolution</classsynopsisinfo>
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.parallel-future')/db:refentry/db:refsect1[@audience='resolution']/descendant::db:methodsynopsis[not(@role='procedural')])">
     <xi:fallback />
    </xi:include>

    <classsynopsisinfo role="comment">State</classsynopsisinfo>
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.parallel-future')/db:refentry/db:refsect1[@audience='state']/descendant::db:methodsynopsis[not(@role='procedural')])">
     <xi:fallback />
    </xi:include>

    <classsynopsisinfo role="comment">Cancellation</classsynopsisinfo>
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.parallel-future')/db:refentry/db:refsect1[@audience='cancellation']/descendant::db:methodsynopsis[not(@role='procedural')])">
     <xi:fallback />
    </xi:include>

   </classsynopsis>
<!-- }}} -->

  </section>

 </partintro>

 &reference.parallel.parallel.entities.future;

</reference>

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