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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@328897 c90b9560-bf6c-de11-be94-00142212c4b1
86 lines
2.8 KiB
XML
86 lines
2.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<chapter xml:id="ev.watcher-callbacks" xmlns:phpdoc="http://php.net/ns/phpdoc" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>Watcher callbacks</title>
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<para>
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All watchers can be active(waiting for events) or inactive(paused). Only
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active watchers will have their callbacks invoked. All callbacks will be
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called with at least two arguments: <parameter>watcher</parameter> - the
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watcher, and <parameter>revents</parameter> a bitmask of received
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events.
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</para>
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<para>
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Watcher callbacks are passed to the watcher contructors(the classes derived
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from <classname>EvWatcher</classname> -
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<methodname>EvCheck::__construct</methodname>,
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<methodname>EvChild::__construct</methodname> etc.). A watcher callback
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should match the following prototype:
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</para>
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<methodsynopsis>
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<type>void</type><methodname>callback</methodname>
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<methodparam
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choice="opt"><type>object</type><parameter>watcher</parameter><initializer>NULL</initializer></methodparam>
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<methodparam
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choice="opt"><type>int</type><parameter>revents</parameter><initializer>NULL</initializer></methodparam>
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</methodsynopsis>
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>watcher</parameter></term>
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<listitem>
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<para>
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The watcher instance(of a class extending
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<classname>EvWatcher</classname>).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>revents</parameter></term>
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<listitem>
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<para>
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<link linkend="ev.constants.watcher-revents">Watcher received events</link>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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Each watcher type has its associated bit in <parameter>revents</parameter>,
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so you can use the same callback for multiple watchers. The event mask is
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named after the type, i.e. <classname>EvChild</classname>(or
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<methodname>EvLoop::child</methodname>) sets <constant>EV::CHILD</constant>,
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<classname>EvPrepare</classname>(or <methodname>EvLoop::prepare</methodname>)
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sets <constant>Ev::PREPARE</constant>, <classname>EvPeriodic</classname>(or
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<methodname>EvLoop::periodic</methodname>) sets
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<constant>Ev::PERIODIC</constant> and so on, with the exception of I/O events
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(which can set both <constant>Ev::READ</constant> and
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<constant>Ev::WRITE</constant> bits).
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</para>
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</chapter>
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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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