sem_acquire

sem_acquire

(PHP 4, PHP 5)

sem_acquireAcquire a semaphore

说明

bool sem_acquire ( resource $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 maximum number of semaphore 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.

参数

sem_identifier

sem_identifier is a semaphore resource, obtained from sem_get().

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE.

参见


  • ftok
  • msg_get_queue
  • msg_queue_exists
  • msg_receive
  • msg_remove_queue
  • msg_send
  • msg_set_queue
  • msg_stat_queue
  • sem_acquire
  • sem_get
  • sem_release
  • sem_remove
  • shm_attach
  • shm_detach
  • shm_get_var
  • shm_has_var
  • shm_put_var
  • shm_remove
  • shm_remove_var
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