1/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <http://www.gnu.org/licenses/>. */
18
19#include "pthreadP.h"
20#include <string.h>
21
22
23static const struct pthread_rwlockattr default_rwlockattr =
24 {
25 .lockkind = PTHREAD_RWLOCK_DEFAULT_NP,
26 .pshared = PTHREAD_PROCESS_PRIVATE
27 };
28
29
30/* See pthread_rwlock_common.c. */
31int
32__pthread_rwlock_init (pthread_rwlock_t *rwlock,
33 const pthread_rwlockattr_t *attr)
34{
35 ASSERT_TYPE_SIZE (pthread_rwlock_t, __SIZEOF_PTHREAD_RWLOCK_T);
36
37 const struct pthread_rwlockattr *iattr;
38
39 iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_rwlockattr;
40
41 memset (rwlock, '\0', sizeof (*rwlock));
42
43 rwlock->__data.__flags = iattr->lockkind;
44
45 /* The value of __SHARED in a private rwlock must be zero. */
46 rwlock->__data.__shared = (iattr->pshared != PTHREAD_PROCESS_PRIVATE);
47
48 return 0;
49}
50strong_alias (__pthread_rwlock_init, pthread_rwlock_init)
51