php-doc-en/reference/sem/functions/msg-get-queue.xml

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  <refentry id="function.msg-get-queue">
   <refnamediv>
    <refname>msg_get_queue</refname>
    <refpurpose>
     Create or attach to a message queue
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>int</type><methodname>msg_get_queue</methodname>
     <methodparam><type>int</type><parameter>key</parameter></methodparam>
     <methodparam choice="opt"><type>int</type><parameter>perms</parameter></methodparam>
    </methodsynopsis>
    <para>
     <function>msg_get_queue</function> returns an id that can be used to
     access the System V message queue with the given
     <parameter>key</parameter>. The first call creates the message queue with
     the optional <parameter>perms</parameter> (default: 0666).
     A second call to <function>msg_get_queue</function> for the same
     <parameter>key</parameter> will return a different message queue
     identifier, but both identifiers access the same underlying message
     queue.
     If the message queue already exists, the <parameter>perms</parameter>
     will be ignored.
    </para>
    <para>
     See also: <function>msg_remove_queue</function>,
     <function>msg_receive</function>, <function>msg_send</function>,
     <function>msg_stat_queue</function> and
     <function>msg_set_queue</function>.
    </para>
   </refsect1>
  </refentry>

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