/* * 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 <errno.h>#include <limits.h>#include "pthread.h"#include "implement.h"intpthread_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;}