mirror of
https://github.com/sigmasternchen/php-doc-en
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fb4f9b53fc
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@327809 c90b9560-bf6c-de11-be94-00142212c4b1
87 lines
2.6 KiB
XML
87 lines
2.6 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<phpdoc:classref xml:id="class.cond" xmlns:phpdoc="http://php.net/ns/phpdoc" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
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<title>The Cond class</title>
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<titleabbrev>Cond</titleabbrev>
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<partintro>
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<!-- {{{ Cond intro -->
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<section xml:id="cond.intro">
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&reftitle.intro;
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<para>
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The following paragraph is taken from the Posix Thread documentation to
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explain the purpose of Condition Variables:
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</para>
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<para>
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Condition variables provide yet another way for threads to synchronize.
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While mutexes implement synchronization by controlling thread access
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to data, condition variables allow threads to synchronize based upon
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the actual value of data. Without condition variables, the programmer
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would need to have threads continually polling (possibly in a critical
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section), to check if the condition is met. This can be very resource
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consuming since the thread would be continuously busy in this activity.
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A condition variable is a way to achieve the same goal without polling.
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A condition variable is always used in conjunction with a mutex lock.
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</para>
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<para>
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pthreads provides PHP with direct access to a carefully selected subset
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of Condition Variable functions.
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</para>
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<para>
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Because of their nature, the programmer must take care to destroy
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Condition Variable handles they are finished with.
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</para>
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</section>
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<!-- }}} -->
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<section xml:id="cond.synopsis">
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&reftitle.classsynopsis;
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<!-- {{{ Synopsis -->
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<classsynopsis>
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<ooclass><classname>Cond</classname></ooclass>
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<!-- {{{ Class synopsis -->
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<classsynopsisinfo>
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<ooclass>
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<classname>Cond</classname>
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</ooclass>
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</classsynopsisinfo>
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<!-- }}} -->
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<classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>
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<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.cond')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[1])" />
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</classsynopsis>
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<!-- }}} -->
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</section>
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</partintro>
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&reference.pthreads.entities.cond;
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</phpdoc:classref>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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