2 * pthread_rwlock_init.c
5 * This translation unit implements read/write lock primitives.
7 * --------------------------------------------------------------------------
9 * Pthreads-win32 - POSIX Threads Library for Win32
10 * Copyright(C) 1998 John E. Bossom
11 * Copyright(C) 1999,2002 Pthreads-win32 contributors
13 * Contact Email: rpj@ise.canberra.edu.au
15 * The current list of contributors is contained
16 * in the file CONTRIBUTORS included with the source
17 * code distribution. The list can also be seen at the
18 * following World Wide Web location:
19 * http://sources.redhat.com/pthreads-win32/contributors.html
21 * This library is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU Lesser General Public
23 * License as published by the Free Software Foundation; either
24 * version 2 of the License, or (at your option) any later version.
26 * This library is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29 * Lesser General Public License for more details.
31 * You should have received a copy of the GNU Lesser General Public
32 * License along with this library in the file COPYING.LIB;
33 * if not, write to the Free Software Foundation, Inc.,
34 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
40 //#include "pthread.h"
41 //#include "implement.h"
46 MODULE_LICENSE("GPL");
50 pthread_rwlock_init(pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *attr)
53 pthread_rwlock_t rwl = 0;
60 if (attr != NULL && *attr != NULL)
62 result = EINVAL; /* Not supported */
66 rwl = (pthread_rwlock_t) calloc(1, sizeof(*rwl));
74 rwl->nSharedAccessCount = 0;
75 rwl->nExclusiveAccessCount = 0;
76 rwl->nCompletedSharedAccessCount = 0;
78 result = pthread_mutex_init(&rwl->mtxExclusiveAccess, NULL);
84 result = pthread_mutex_init(&rwl->mtxSharedAccessCompleted, NULL);
90 result = pthread_cond_init(&rwl->cndSharedAccessCompleted, NULL);
96 rwl->nMagic = PTW32_RWLOCK_MAGIC;
102 (void) pthread_mutex_destroy(&(rwl->mtxSharedAccessCompleted));
105 (void) pthread_mutex_destroy(&(rwl->mtxExclusiveAccess));