(PHP3 >= 3.0.6, PHP4 )

sem_acquire -- Acquire a semaphore


int sem_acquire (int sem_identifier)

Returns: true on success, false on error.

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.

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().