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/*
* pthread_mutex_unlock.c
*
* Description:
* This translation unit implements mutual exclusion (mutex) primitives.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2003 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
int
pthread_mutex_unlock (pthread_mutex_t * mutex)
{
int result = 0;
pthread_mutex_t mx;
/*
* Let the system deal with invalid pointers.
*/
mx = *mutex;
/*
* If the thread calling us holds the mutex then there is no
* race condition. If another thread holds the
* lock then we shouldn't be in here.
*/
if (mx < PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
{
if (mx->kind == PTHREAD_MUTEX_NORMAL)
{
LONG idx;
idx = (LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
(LONG) 0);
if (idx != 0)
{
if (idx < 0)
{
/*
* Someone may be waiting on that mutex.
* Pulse event on an auto-reset event will
* release one waiter if possible, otherwise
* it will just reset the event.
*/
if (PulseEvent (mx->event) == 0)
{
result = EINVAL;
}
}
}
else
{
/*
* Was not locked (so can't be owned by us).
*/
result = EPERM;
}
}
else
{
if (pthread_equal (mx->ownerThread, pthread_self ()))
{
if (mx->kind != PTHREAD_MUTEX_RECURSIVE
|| 0 == --mx->recursive_count)
{
mx->ownerThread = NULL;
if ((LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
(LONG) 0) < 0)
{
/* Someone may be waiting on that mutex */
if (SetEvent (mx->event) == 0)
{
result = EINVAL;
}
}
}
}
else
{
result = EPERM;
}
}
}
else
{
result = EINVAL;
}
return (result);
}
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