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pthread_rwlock_init.c    110 lines (91 with data), 2.8 kB

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/*
* pthread_rwlock_init.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_init (pthread_rwlock_t * rwlock,
const pthread_rwlockattr_t * attr)
{
int result;
pthread_rwlock_t rwl = 0;
if (rwlock == NULL)
{
return EINVAL;
}
if (attr != NULL && *attr != NULL)
{
result = EINVAL; /* Not supported */
goto DONE;
}
rwl = (pthread_rwlock_t) calloc (1, sizeof (*rwl));
if (rwl == NULL)
{
result = ENOMEM;
goto DONE;
}
rwl->nSharedAccessCount = 0;
rwl->nExclusiveAccessCount = 0;
rwl->nCompletedSharedAccessCount = 0;
result = pthread_mutex_init (&rwl->mtxExclusiveAccess, NULL);
if (result != 0)
{
goto FAIL0;
}
result = pthread_mutex_init (&rwl->mtxSharedAccessCompleted, NULL);
if (result != 0)
{
goto FAIL1;
}
result = pthread_cond_init (&rwl->cndSharedAccessCompleted, NULL);
if (result != 0)
{
goto FAIL2;
}
rwl->nMagic = PTW32_RWLOCK_MAGIC;
result = 0;
goto DONE;
FAIL2:
(void) pthread_mutex_destroy (&(rwl->mtxSharedAccessCompleted));
FAIL1:
(void) pthread_mutex_destroy (&(rwl->mtxExclusiveAccess));
FAIL0:
(void) free (rwl);
rwl = NULL;
DONE:
*rwlock = rwl;
return result;
}