sem_acquire
PHP function
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(PHP 4, PHP 5, PHP 7, PHP 8)
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 fromsem_get().non_blockingSpecifies 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.
Return Values
Success
Changelog
| Version | Description |
|---|---|
| 8.0.0 | semaphore expects a SysvSemaphore instance now; previously, a resource was expected. |