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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) 1999,2012 Pthreads-win32 contributors
*
* Homepage1: http://sourceware.org/pthreads-win32/
* Homepage2: http://sourceforge.net/projects/pthreads4w/
*
* 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
*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#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;
}
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