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Описание

resource sem_get ( int $key [, int $max_acquire [, int $perm [, int $auto_release ]]] )

sem_get() returns an id that can be used to access the System V semaphore with the given key .

A second call to sem_get() for the same key will return a different semaphore identifier, but both identifiers access the same underlying semaphore.

Список параметров

key
max_acquire: The number of processes that can acquire the semaphore simultaneously is set to max_acquire (defaults to 1).
perm: The semaphore permissions. Defaults to 0666. Actually this value is set only if the process finds it is the only process currently attached to the semaphore.
auto_release: Specifies if the semaphore should be automatically released on request shutdown.

Возвращаемые значения

Returns a positive semaphore identifier on success, or FALSE on error.

Список изменений

Версия	Описание
4.3.0	The `auto_release` parameter was added.

Смотрите также

sem_acquire() - Acquire a semaphore
sem_release() - Release a semaphore
ftok() - Convert a pathname and a project identifier to a System V IPC key