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.
semaphore is a semaphore obtained from sem_get.
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.
Returns true on success or false on failure.
|8.0.0||semaphore expects a SysvSemaphore instance now; previously, a resource was expected.|