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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<!-- splitted from ./en/functions/sem.xml, last change in rev 1.2 -->
<refentry id="function.sem-get">
<refnamediv>
<refname>sem_get</refname>
<refpurpose>Get a semaphore id</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>resource</type><methodname>sem_get</methodname>
<methodparam><type>int</type><parameter>key</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>max_acquire</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>perm</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>auto_release</parameter></methodparam>
</methodsynopsis>
<para>
<function>sem_get</function> returns an id that can be used to
access the System V semaphore with the given <parameter>key</parameter>.
The semaphore is created if necessary using the permission bits specified in
<parameter>perm</parameter> (defaults to 0666). The number of processes that can
acquire the semaphore simultaneously is set to <parameter>max_acquire</parameter>
(defaults to 1). Actually this value is set only if the process
finds it is the only process currently attached to the semaphore.
</para>
<para>
Optional parameter <parameter>auto_release</parameter> specifies if the
semaphore should be automatically released on request shutdown.
It is available since PHP 4.3.0.
</para>
<para>
Returns a positive semaphore identifier on success, or &false; on
error.
</para>
<para>
A second call to <function>sem_get</function> for the same key
will return a different semaphore identifier, but both
identifiers access the same underlying semaphore.
</para>
<para>
See also <function>sem_acquire</function>,
<function>sem_release</function>, and <function>ftok</function>.
</para>
</refsect1>
</refentry>
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