(PHP 4, PHP 5, PHP 7)
sem_release — Release a semaphore
$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.
성공 시 TRUE
를, 실패 시 FALSE
를 반환합니다.