sem_acquire

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

    sem_acquire — Acquire a semaphore

    说明

    sem_acquire(SysvSemaphore $semaphore, bool $non_blocking = false): bool

    sem_acquire() by default 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

    semaphore

    semaphore is a semaphore obtained from sem_get().

    non_blocking

    Specifies if the process shouldn't wait for the semaphore to be acquired. If set to true, the call will return false immediately if a semaphore cannot be immediately acquired.

    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.

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