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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 288721 $ -->
<refentry xml:id="streamwrapper.stream-lock" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>streamWrapper::stream_lock</refname>
<refpurpose>Advisory file locking</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>public</modifier> <type>bool</type><methodname>streamWrapper::stream_lock</methodname>
<methodparam><type>mode</type><parameter>operation</parameter></methodparam>
</methodsynopsis>
<para>
This method is called in response to <function>flock</function>, when
<function>file_put_contents</function> (when <parameter>flags</parameter>
contains <constant>LOCK_EX</constant>),
<function>stream_set_blocking</function> and when closing the stream
(<constant>LOCK_UN</constant>).
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>operation</parameter></term>
<listitem>
<para>
<parameter>operation</parameter> is one of the following:
<itemizedlist>
<listitem>
<simpara>
<constant>LOCK_SH</constant> to acquire a shared lock (reader).
</simpara>
</listitem>
<listitem>
<simpara>
<constant>LOCK_EX</constant> to acquire an exclusive lock (writer).
</simpara>
</listitem>
<listitem>
<simpara>
<constant>LOCK_UN</constant> to release a lock (shared or exclusive).
</simpara>
</listitem>
<listitem>
<simpara>
<constant>LOCK_NB</constant> if you don't want
<function>flock</function> to block while locking.
(not supported on Windows)
</simpara>
</listitem>
</itemizedlist>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="errors"><!-- {{{ -->
&reftitle.errors;
<para>
Emits <constant>E_WARNING</constant> if call to this method fails (i.e. not implemented).
</para>
</refsect1><!-- }}} -->
<!--
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>streamWrapper::stream_lock</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
/* ... */
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
...
]]>
</screen>
</example>
</para>
</refsect1>
-->
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>stream_set_blocking</function></member>
<member><function>flock</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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