1 /* Check that error checking mutexes are not subject to lock elision.
2 Copyright (C) 2016-2021 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 <stdio.h>
20 #include <errno.h>
21 #include <time.h>
22 #include <pthread.h>
23 #include <support/check.h>
24
25 static int
do_test(void)26 do_test (void)
27 {
28 struct timespec tms = { 0 };
29 pthread_mutex_t mutex;
30 pthread_mutexattr_t mutexattr;
31 int ret = 0;
32
33 TEST_COMPARE (pthread_mutexattr_init (&mutexattr), 0);
34 TEST_COMPARE (pthread_mutexattr_settype (&mutexattr,
35 PTHREAD_MUTEX_ERRORCHECK), 0);
36
37 TEST_COMPARE (pthread_mutex_init (&mutex, &mutexattr), 0);
38 TEST_COMPARE (pthread_mutexattr_destroy (&mutexattr), 0);
39
40 /* The call to pthread_mutex_timedlock erroneously enabled lock elision
41 on the mutex, which then triggered an assertion failure in
42 pthread_mutex_unlock. It would also defeat the error checking nature
43 of the mutex. */
44 TEST_COMPARE (pthread_mutex_timedlock (&mutex, &tms), 0);
45 TEST_COMPARE (pthread_mutex_timedlock (&mutex, &tms), EDEADLK);
46
47 TEST_COMPARE (pthread_mutex_unlock (&mutex), 0);
48
49 return ret;
50 }
51
52 #include <support/test-driver.c>
53