native_client_sdk/src/libraries/third_party/pthreads-win32/pthread_rwlock_init.c

   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@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 }