sem_acquire Acquire a semaphore


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


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» sem_get
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