sem_get
(PHP 4, PHP 5)
sem_get — Get a semaphore id
Description
resource sem_get
( int $key
[, int $max_acquire
[, int $perm
[, int $auto_release
]]] )
A second call to sem_get() for the same key
will return a different semaphore identifier, but both
identifiers access the same underlying semaphore.
Parameters
-
key
-
-
max_acquire
-
The number of processes that can acquire the semaphore simultaneously
is set to max_acquire
(defaults to 1).
-
perm
-
The semaphore permissions. Defaults to 0666. Actually this value is
set only if the process finds it is the only process currently
attached to the semaphore.
-
auto_release
-
Specifies if the semaphore should be automatically released on request
shutdown.
Return Values
Returns a positive semaphore identifier on success, or FALSE on
error.
