mutex_unlock(SYNCH)
mutex_unlock --
unlock a mutex
Synopsis
cc [options] -Kthread file
#include <synch.h>
int mutex_unlock(mutex_t *mutex);
Description
mutex_unlock unlocks the mutex pointed to by mutex.
If there are one or more threads waiting for the mutex when
mutex_unlock is called,
at least one waiting thread is
allowed to try again to acquire the mutex.
If more than one thread is waiting, the choice of which to release from the
blocked group is scheduling-policy-specific:
Bound threads have priority over multiplexed threads; then
within each category the choice of thread is scheduling-policy-specific.
Parameters
mutex-
pointer to mutex to be unlocked
Usage
Mutexes acquired with mutex_lock and mutex_trylock
should be released with mutex_unlock.
Return values
mutex_unlock returns zero for success
and an error number for failure.
Errors
If the following condition is detected,
mutex_unlock returns the corresponding value:
EINVAL-
invalid argument specified
References
Intro(SYNCH),
mutex(SYNCH),
mutex_destroy(SYNCH),
mutex_init(SYNCH),
mutex_lock(SYNCH),
mutex_trylock(SYNCH)
© 2005 The SCO Group, Inc. All rights reserved.
SCO OpenServer Release 6.0.0 - 01 June 2005