/* * 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" 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; }