1 /* Copyright (C) 2002-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include "pthreadP.h"
19 #include <string.h>
20 #include <pthread-offsets.h>
21 #include <shlib-compat.h>
22
23 static 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. */
31 int
___pthread_rwlock_init(pthread_rwlock_t * rwlock,const pthread_rwlockattr_t * attr)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 /* The __flags is the only field where its offset should be checked to
38 avoid ABI breakage with static initializers. */
39 ASSERT_PTHREAD_INTERNAL_OFFSET (pthread_rwlock_t, __data.__flags,
40 __PTHREAD_RWLOCK_FLAGS_OFFSET);
41 ASSERT_PTHREAD_INTERNAL_MEMBER_SIZE (pthread_rwlock_t, __data.__flags,
42 int);
43
44 const struct pthread_rwlockattr *iattr;
45
46 iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_rwlockattr;
47
48 memset (rwlock, '\0', sizeof (*rwlock));
49
50 rwlock->__data.__flags = iattr->lockkind;
51
52 /* The value of __SHARED in a private rwlock must be zero. */
53 rwlock->__data.__shared = (iattr->pshared != PTHREAD_PROCESS_PRIVATE);
54
55 return 0;
56 }
57 versioned_symbol (libc, ___pthread_rwlock_init, pthread_rwlock_init,
58 GLIBC_2_34);
59 libc_hidden_ver (___pthread_rwlock_init, __pthread_rwlock_init)
60 #ifndef SHARED
61 strong_alias (___pthread_rwlock_init, __pthread_rwlock_init)
62 #endif
63
64 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_1, GLIBC_2_34)
65 compat_symbol (libpthread, ___pthread_rwlock_init, pthread_rwlock_init,
66 GLIBC_2_1);
67 #endif
68 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
69 compat_symbol (libpthread, ___pthread_rwlock_init, __pthread_rwlock_init,
70 GLIBC_2_2);
71 #endif
72