Description
int sem_get (int key [, int
max_acquire [, int
perm]])
Returns: A positive semaphore identifier on success, or false on
error.
Sem_get() returns an id that can be used to
access the System V semaphore with the given key. The semaphore
is created if necessary using the permission bits specified in
perm (defaults to 0666). The number of processes that can
acquire the semaphore simultaneously is set to max_acquire
(defaults to 1). Actually this value is set only if the process
finds it is the only process currently attached to the semaphore.
A second call to sem_get() for the same key
will return a different semaphore identifier, but both
identifiers access the same underlying semaphore.
See also: sem_acquire() and
sem_release().
