php-doc-en/reference/parallel/setup.xml

<?xml version="1.0" encoding="utf-8"?>
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<chapter xml:id="parallel.setup" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>Installation</title>

 <simplesect xml:id="parallel.requirements">
  &reftitle.required;
  <para>
 parallel requires a build of PHP with ZTS (Zend Thread Safety) enabled ( --enable-maintainer-zts or --enable-zts on Windows )
  </para>
  <caution>
  <para>
 Zend Thread Safety cannot be enabled post build; it is a build time configuration option.
  </para>
  </caution>
  <para>
 parallel should build anywhere there is a working Posix Threads header (pthread.h) and ZTS build of PHP, including Windows (using the pthread-w32 project from redhat).
  </para>
 </simplesect>

 <simplesect xml:id="parallel.installation">
  &reftitle.install;
  <para>
   parallel releases are hosted by PECL and the source code by 
    <link xlink:href="&url.git.hub;krakjoe/parallel">github</link>, 
   the easiest route to installation is the normal PECL route:
   <link xlink:href="&url.pecl.package;parallel">&url.pecl.package;parallel</link>.
  </para>
  <para>
 Windows users can download prebuilt release binaries from the <link xlink:href="&url.pecl.windows.releases;parallel">PECL</link> website.
  </para>
  <caution>
   <para>
 Windows users need to take the additional step of adding pthreadVC2.dll (distributed with Windows releases) to their <envar>PATH</envar>.
   </para>
  </caution>
 </simplesect>

</chapter>

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