sem_acquirePHP ManualPrevNextsem_acquiresem_acquire -- acquire a semaphoreDescriptionint 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().PrevHomeNextsem_getUpsem_release