   #PHP Manual Semaphore, Shared Memory and IPC Functions msg_stat_queue
   sem_get

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                                  sem_acquire

   (PHP 3>= 3.0.6, PHP 4 )
   sem_acquire -- Acquire a semaphore

Description

   bool sem_acquire ( int sem_identifier)

   sem_acquire() 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 max_acquire value to be exceeded.

   Returns TRUE on success or FALSE on failure.

   After processing a request, any semaphores acquired by the process but
   not explicitly released will be released automatically and a warning
   will be generated.

   See also: sem_get() and sem_release().
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