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  <refentry id="function.sem-acquire">
   <refnamediv>
    <refname>sem_acquire</refname>
    <refpurpose>Acquire a semaphore</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>sem_acquire</methodname>
      <methodparam><type>resource</type><parameter>sem_identifier</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>sem_acquire</function> blocks (if necessary) until the
     semaphore can be acquired.  A process attempting to acquire a
     semaphore which it has already acquired will block forever
     if acquiring the semaphore would cause its maximum number
     of semaphore to be exceeded.
     <parameter>sem_identifier</parameter> is a semaphore ressource,
     obtained from <function>sem_get</function>.
    </para>
    <para>
     &return.success;
    </para>
    <para>
     After processing a request, any semaphores acquired by the
     process but not explicitly released will be released automatically
     and a warning will be generated.
    </para>
    <para> 
     See also
     <function>sem_get</function>, and
     <function>sem_release</function>.
    </para>
   </refsect1>
  </refentry>

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