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PTHREAD_RWLOCK_UNLOCK(P)   POSIX Programmer's Manual  PTHREAD_RWLOCK_UNLOCK(P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       pthread_rwlock_unlock - unlock a read-write lock object

SYNOPSIS
       #include <pthread.h>

       int pthread_rwlock_unlock(pthread_rwlock_t *rwlock);

DESCRIPTION
       The pthread_rwlock_unlock() function shall release a lock held  on  the
       read-write  lock object referenced by rwlock.  Results are undefined if
       the read-write lock rwlock is not held by the calling thread.

       If this function is called to release a read lock from  the  read-write
       lock object and there are other read locks currently held on this read-
       write lock object, the read-write  lock	object	remains	 in  the  read
       locked  state.  If  this	 function releases the last read lock for this
       read-write lock object, the read-write lock object shall be put in  the
       unlocked state with no owners.

       If  this function is called to release a write lock for this read-write
       lock object, the read-write lock object shall be put  in	 the  unlocked
       state.

       If there are threads blocked on the lock when it becomes available, the
       scheduling policy shall determine which	thread(s)  shall  acquire  the
       lock.	 If  the Thread Execution Scheduling option is supported, when
       threads executing with the scheduling policies SCHED_FIFO, SCHED_RR, or
       SCHED_SPORADIC  are waiting on the lock, they shall acquire the lock in
       priority order when the lock  becomes  available.  For  equal  priority
       threads,	 write	locks  shall  take precedence over read locks.	If the
       Thread Execution Scheduling option is not supported, it is  implementa‐
       tion-defined whether write locks take precedence over read locks.

       Results	are  undefined	if  any	 of these functions are called with an
       uninitialized read-write lock.

RETURN VALUE
       If successful, the pthread_rwlock_unlock() function shall return	 zero;
       otherwise, an error number shall be returned to indicate the error.

ERRORS
       The pthread_rwlock_unlock() function may fail if:

       EINVAL The  value  specified by rwlock does not refer to an initialized
	      read-write lock object.

       EPERM  The current thread does not hold a lock on the read-write lock.

       The pthread_rwlock_unlock() function shall not return an error code  of
       [EINTR].

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       pthread_rwlock_destroy()	       ,       pthread_rwlock_rdlock()	     ,
       pthread_rwlock_timedrdlock()    ,    pthread_rwlock_timedwrlock()     ,
       pthread_rwlock_tryrdlock()      ,      pthread_rwlock_trywrlock()     ,
       pthread_rwlock_wrlock()	 ,   the   Base	   Definitions	  volume    of
       IEEE Std 1003.1-2001, <pthread.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003	      PTHREAD_RWLOCK_UNLOCK(P)
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