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
42int
43pthread_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
95FAIL2:
96  (void) pthread_mutex_destroy (&(rwl->mtxSharedAccessCompleted));
97
98FAIL1:
99  (void) pthread_mutex_destroy (&(rwl->mtxExclusiveAccess));
100
101FAIL0:
102  (void) free (rwl);
103  rwl = NULL;
104
105DONE:
106  *rwlock = rwl;
107
108  return result;
109}
110