1/* Copyright (C) 2005-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2005.
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 <errno.h>
20#include <pthreadP.h>
21#include <shlib-compat.h>
22
23int
24__pthread_mutex_consistent (pthread_mutex_t *mutex)
25{
26 /* Test whether this is a robust mutex with a dead owner.
27 See concurrency notes regarding __kind in struct __pthread_mutex_s
28 in sysdeps/nptl/bits/thread-shared-types.h. */
29 if ((atomic_load_relaxed (&(mutex->__data.__kind))
30 & PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0
31 || mutex->__data.__owner != PTHREAD_MUTEX_INCONSISTENT)
32 return EINVAL;
33
34 mutex->__data.__owner = THREAD_GETMEM (THREAD_SELF, tid);
35
36 return 0;
37}
38versioned_symbol (libc, __pthread_mutex_consistent, pthread_mutex_consistent,
39 GLIBC_2_34);
40
41#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_4, GLIBC_2_34)
42# undef pthread_mutex_consistent_np
43compat_symbol (libpthread, __pthread_mutex_consistent,
44 pthread_mutex_consistent_np, GLIBC_2_4);
45#endif
46
47#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_12, GLIBC_2_34)
48compat_symbol (libpthread, __pthread_mutex_consistent,
49 pthread_mutex_consistent, GLIBC_2_12);
50#endif
51