(PHP 4, PHP 5, PHP 7, PHP 8)
sem_release — Release a semaphore
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.
成功时返回 true， 或者在失败时返回 false。
| 版本 | 说明 |
|---|---|
| 8.0.0 |
semaphore expects a SysvSemaphore
instance now; previously, a resource was expected.
|