# sem_release

(PHP 4, PHP 5, PHP 7, PHP 8)

sem_release — Release a semaphore

### 说明

sem_release(SysvSemaphore `$semaphore`): bool

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.

### 参数

`semaphore`

  A Semaphore as returned by sem_get().

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 更新日志

版本 | 说明
--- | ---
8.0.0 | `semaphore` expects a SysvSemaphore instance now; previously, a resource was expected.

### 参见

- sem_get() - Get a semaphore id
- sem_acquire() - Acquire a semaphore

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