pthread_mutex_unlock man page on DigitalUNIX

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pthread_mutex_unlock(3)				       pthread_mutex_unlock(3)

       pthread_mutex_unlock - Unlocks the specified mutex

       #include <pthread.h>

       int pthread_mutex_unlock(
	       pthread_mutex_t *mutex );

       DECthreads POSIX 1003.1c Library (

       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       IEEE Std 1003.1c-1995, POSIX System Application Program Interface

       Mutex to be unlocked.

       This routine unlocks the mutex specified by the mutex argument.

       This routine behaves as follows, based on the  type  of	the  specified
       mutex:  For  a  normal,	default,  or errorcheck mutex: if the mutex is
       owned by the calling thread, it is unlocked with no current owner. Fur‐
       ther,  for  a normal or default mutex: if the mutex is not locked or is
       locked by another thread, this routine can  also	 return	 [EPERM],  but
       this  is	 not guaranteed.  For an errorcheck mutex: if the mutex is not
       locked or is locked by another thread, this  routine  returns  [EPERM].
       For a recursive mutex: if the mutex is owned by the calling thread, the
       lock count is decremented. The mutex remains locked and owned until the
       lock  count  reaches  zero  (0).	 When the lock count reaches zero, the
       mutex becomes unlocked with no current owner.

       If one or more threads are waiting to lock the specified mutex, and the
       mutex  becomes  unlocked, this routine causes one thread to unblock and
       to try to acquire the mutex. The scheduling policy is used to determine
       which  thread  to  unblock. For the SCHED_FIFO and SCHED_RR policies, a
       blocked thread is chosen in priority  order,  using  first-in/first-out
       within  priorities.   Note  that the mutex might not be acquired by the
       awakened thread if any other running thread attempts to lock the	 mutex

       On  Tru64  UNIX,	 if  a	signal	is delivered to a thread waiting for a
       mutex, upon return from the signal handler, the thread resumes  waiting
       for the mutex as if it was not interrupted.

       If  an  error  condition	 occurs, this routine returns an integer value
       indicating the type of error. Possible return values  are  as  follows:
       Successful  completion.	The value specified for mutex is invalid.  The
       calling thread does not own the mutex.


       Functions:   pthread_mutexattr_settype(3),    pthread_mutex_destroy(3),
       pthread_mutex_init(3), pthread_mutex_lock(3), pthread_mutex_trylock(3)

       Manuals: Guide to DECthreads and Programmer's Guide


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