1 /* Initialize a rwlock. Generic version.
2 Copyright (C) 2002-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <pthread.h>
20 #include <string.h>
21 #include <pt-internal.h>
22
23 int
_pthread_rwlock_init(pthread_rwlock_t * rwlock,const pthread_rwlockattr_t * attr)24 _pthread_rwlock_init (pthread_rwlock_t *rwlock,
25 const pthread_rwlockattr_t *attr)
26 {
27 ASSERT_TYPE_SIZE (pthread_rwlock_t, __SIZEOF_PTHREAD_RWLOCK_T);
28
29 *rwlock = (pthread_rwlock_t) __PTHREAD_RWLOCK_INITIALIZER;
30
31 if (attr == NULL
32 || memcmp (attr, &__pthread_default_rwlockattr, sizeof (*attr)) == 0)
33 /* Use the default attributes. */
34 return 0;
35
36 /* Non-default attributes. */
37
38 rwlock->__attr = malloc (sizeof *attr);
39 if (rwlock->__attr == NULL)
40 return ENOMEM;
41
42 *rwlock->__attr = *attr;
43 return 0;
44 }
45
46 strong_alias (_pthread_rwlock_init, pthread_rwlock_init);
47