sem_acquire() 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. sem_identifier is a semaphore ressource, obtained from sem_get().
Returns TRUE on success or FALSE on failure.
After processing a request, any semaphores acquired by the process but not explicitly released will be released automatically and a warning will be generated.
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