1 /* 2 * pthread_rwlock_init.c 3 * 4 * Description: 5 * This translation unit implements read/write lock primitives. 6 * 7 * -------------------------------------------------------------------------- 8 * 9 * Pthreads-win32 - POSIX Threads Library for Win32 10 * Copyright(C) 1998 John E. Bossom 11 * Copyright(C) 1999,2005 Pthreads-win32 contributors 12 * 13 * Contact Email: rpj (at) callisto.canberra.edu.au 14 * 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 20 * 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. 25 * 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. 30 * 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 35 */ 36 37 #include <limits.h> 38 39 #include "pthread.h" 40 #include "implement.h" 41 42 int 43 pthread_rwlock_init (pthread_rwlock_t * rwlock, 44 const pthread_rwlockattr_t * attr) 45 { 46 int result; 47 pthread_rwlock_t rwl = 0; 48 49 if (rwlock == NULL) 50 { 51 return EINVAL; 52 } 53 54 if (attr != NULL && *attr != NULL) 55 { 56 result = EINVAL; /* Not supported */ 57 goto DONE; 58 } 59 60 rwl = (pthread_rwlock_t) calloc (1, sizeof (*rwl)); 61 62 if (rwl == NULL) 63 { 64 result = ENOMEM; 65 goto DONE; 66 } 67 68 rwl->nSharedAccessCount = 0; 69 rwl->nExclusiveAccessCount = 0; 70 rwl->nCompletedSharedAccessCount = 0; 71 72 result = pthread_mutex_init (&rwl->mtxExclusiveAccess, NULL); 73 if (result != 0) 74 { 75 goto FAIL0; 76 } 77 78 result = pthread_mutex_init (&rwl->mtxSharedAccessCompleted, NULL); 79 if (result != 0) 80 { 81 goto FAIL1; 82 } 83 84 result = pthread_cond_init (&rwl->cndSharedAccessCompleted, NULL); 85 if (result != 0) 86 { 87 goto FAIL2; 88 } 89 90 rwl->nMagic = PTW32_RWLOCK_MAGIC; 91 92 result = 0; 93 goto DONE; 94 95 FAIL2: 96 (void) pthread_mutex_destroy (&(rwl->mtxSharedAccessCompleted)); 97 98 FAIL1: 99 (void) pthread_mutex_destroy (&(rwl->mtxExclusiveAccess)); 100 101 FAIL0: 102 (void) free (rwl); 103 rwl = NULL; 104 105 DONE: 106 *rwlock = rwl; 107 108 return result; 109 } 110