pthread_mutex_unlock(3T)pthread_mutex_unlock(3T)NAMEpthread_mutex_unlock() - unlock a mutex.
SYNOPSISPARAMETERS
mutex Pointer to the mutex to be unlocked.
DESCRIPTION
The function is called by the owner of the mutex referenced by mutex to
unlock the mutex. The manner in that the mutex is released is depen‐
dent upon the mutex's type attribute. For normal and default mutexes,
undefined behavior will result if is called on an unlocked mutex or by
a thread that is not the current owner. For recursive and error-check‐
ing mutexes, an error is returned if is called on an unlocked mutex or
by a thread which is not the current owner.
For recursive mutexes, the owner must call as many times as the mutex
was locked before another thread can lock the mutex.
If there are threads blocked on the mutex referenced by mutex when
releases the mutex, the scheduling policy is used to determine which
thread will acquire the mutex next.
RETURN VALUE
Upon successful completion, returns zero. Otherwise, an error number is
returned to indicate the error (the variable is not set).
ERRORS
For each of the following conditions, if the condition is detected, the
function returns the corresponding error number:
[EINVAL] mutex is not an initialized mutex.
[EPERM] The calling thread does not own mutex. On HP-UX,
this error is not detected for or mutexes.
[EFAULT] mutex parameter points to an illegal address.
AUTHOR
was derived from the IEEE POSIX P1003.1c standard and HP extensions.
SEE ALSOpthread_mutex_init(3T), pthread_mutex_destroy(3T),
pthread_mutex_lock(3T), pthread_mutex_trylock(3T).
STANDARDS CONFORMANCE
Pthread Library pthread_mutex_unlock(3T)
