sem_release

(PHP 4, PHP 5)

sem_release — Release a semaphore

bool sem_release ( resource $sem_identifier )

sem_release() releases the semaphore if it is currently acquired by the calling process, otherwise a warning is generated.

After releasing the semaphore, sem_acquire() may be called to re-acquire it.

如果成功则返回 TRUE，失败则返回 FALSE。