Acquire a semaphore
(PHP 4, PHP 5)
Code Examples / Notes » sem_acquire
there is no way to use IPC_NOWAIT flag.
Just to clarify what is meant by "process" above:
On the Apache webserver, many PHP requests will be executed within the same process space because it is multithreaded. However, any semaphores got and acquired by a script and not released and removed will still be automatically cleaned up by the PHP interpreter each time the script terminates.
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