(PHP 4, PHP 5, PHP 7)

sem_releaseRelease a semaphore


sem_release ( resource $sem_identifier ) : bool

sem_release() releases the semaphore if it is currently acquired by the calling process, otherwise a warning is generated.

After releasing the semaphore, sem_acquire() may be called to re-acquire it.



A Semaphore resource handle as returned by sem_get().

Return Values

Returns TRUE on success or FALSE on failure.

See Also

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