94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
|
|
* pthread_rwlock_unlock.c
|
|
*
|
|
* Description:
|
|
* This translation unit implements read/write lock primitives.
|
|
*
|
|
* --------------------------------------------------------------------------
|
|
*
|
|
* Pthreads-win32 - POSIX Threads Library for Win32
|
|
* Copyright(C) 1998 John E. Bossom
|
|
* Copyright(C) 1999,2005 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 <limits.h>
|
|
|
|
#include "pthread.h"
|
|
#include "implement.h"
|
|
|
|
int
|
|
pthread_rwlock_unlock (pthread_rwlock_t * rwlock)
|
|
{
|
|
int result, result1;
|
|
pthread_rwlock_t rwl;
|
|
|
|
if (rwlock == NULL || *rwlock == NULL)
|
|
{
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
|
|
{
|
|
/*
|
|
* Assume any race condition here is harmless.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
rwl = *rwlock;
|
|
|
|
if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
if (rwl->nExclusiveAccessCount == 0)
|
|
{
|
|
if ((result =
|
|
pthread_mutex_lock (&(rwl->mtxSharedAccessCompleted))) != 0)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
if (++rwl->nCompletedSharedAccessCount == 0)
|
|
{
|
|
result = pthread_cond_signal (&(rwl->cndSharedAccessCompleted));
|
|
}
|
|
|
|
result1 = pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted));
|
|
}
|
|
else
|
|
{
|
|
rwl->nExclusiveAccessCount--;
|
|
|
|
result = pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted));
|
|
result1 = pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
|
|
|
|
}
|
|
|
|
return ((result != 0) ? result : result1);
|
|
}
|