   #PHP Manual Semaphore, Shared Memory and IPC Functions sem_acquire
   sem_release

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                                    sem_get

   (PHP 3>= 3.0.6, PHP 4 )
   sem_get -- Get a semaphore id

Description

   int sem_get ( int key [, int max_acquire [, int perm]])

   sem_get() returns an id that can be used to access the System V
   semaphore with the given key. The semaphore is created if necessary
   using the permission bits specified in perm (defaults to 0666). The
   number of processes that can acquire the semaphore simultaneously is
   set to max_acquire (defaults to 1). Actually this value is set only if
   the process finds it is the only process currently attached to the
   semaphore.

   Returns: A positive semaphore identifier on success, or FALSE on
   error.

   A second call to sem_get() for the same key will return a different
   semaphore identifier, but both identifiers access the same underlying
   semaphore.

   See also sem_acquire(), sem_release(), and ftok().

     Note: This function does not work on Windows systems.
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