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# sem_acquire

(PHP 3>= 3.0.6, PHP 4 , PHP 5)

sem_acquire -- Acquire a semaphore

## Description

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. sem_identifier is a semaphore ressource, obtained from sem_get().

成功回傳`TRUE`失敗回傳`FALSE`。

After processing a request, any semaphores acquired by the process but not explicitly released will be released automatically and a warning will be generated.

See also sem_get(), and sem_release().

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