| /* |
| * 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; |
| } |