Php/docs/function.sem-acquire
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sem_acquire
(PHP 4, PHP 5, PHP 7)
sem_acquire — Acquire a semaphore
Description
sem_acquire
( SysvSemaphore $semaphore
[, bool $non_blocking = FALSE
] ) : bool
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.
Parameters
semaphoresemaphoreis a semaphore obtained from sem_get().non_blocking- Specifies if the process shouldn't wait for the semaphore to be acquired. If set to
true, the call will returnfalseimmediately if a semaphore cannot be immediately acquired.
Return Values
Returns TRUE on success or FALSE on failure.
Changelog
| Version | Description |
|---|---|
| 8.0.0 | semaphore expects a SysvSemaphore
instance now; previously, a resource was expected. |
