PHP. Руководство по PHP. 2005
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sem_release
Description
bool sem_release (resource sem_identifier)
sem_release() releases the semaphore if it is currently acquired by the calling process, otherwise a warning is generated.
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
After releasing the semaphore, sem_acquire() may be called to re-acquire it.
See also sem_get() and sem_acquire().
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Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.
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