PHP. Руководство по PHP. 2005
sem_acquire
sem_acquire
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().
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
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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Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.
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