sem_acquire - Acquire a semaphore
Вернуться к: Semaphore Функции
sem_acquire
(PHP 4, PHP 5, PHP 7)
sem_acquire — Acquire a semaphore
Описание
$sem_identifier
[, bool $nowait = false
] )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.
Список параметров
-
sem_identifier -
sem_identifieris a semaphore resource, obtained from sem_get(). -
nowait -
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.
Возвращаемые значения
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
Список изменений
| Версия | Описание |
|---|---|
| 5.6.1 |
The $nowait parameter was added.
|
Вернуться к: Semaphore Функции