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Semaphore, Shared Memory and IPC Функции
sem_acquire
(PHP 4, PHP 5)
sem_acquire — Acquire a semaphore
Описание
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.
Список параметров
- sem_identifier
-
sem_identifier is a semaphore resource, obtained from sem_get().
Возвращаемые значения
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
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