1 /* Test mutexes.
2 Copyright (C) 2000-2022 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 #define _GNU_SOURCE
20
21 #include <pthread.h>
22 #include <assert.h>
23 #include <unistd.h>
24 #include <error.h>
25 #include <errno.h>
26 #include <stdio.h>
27
28 #define THREADS 500
29
30 void *
foo(void * arg)31 foo (void *arg)
32 {
33 pthread_mutex_t *mutex = arg;
34 pthread_mutex_lock (mutex);
35 pthread_mutex_unlock (mutex);
36 return mutex;
37 }
38
39 int
main(int argc,char ** argv)40 main (int argc, char **argv)
41 {
42 int i;
43 error_t err;
44 pthread_t tid[THREADS];
45 pthread_mutex_t mutex[THREADS];
46
47 for (i = 0; i < THREADS; i++)
48 {
49 pthread_mutex_init (&mutex[i], 0);
50 pthread_mutex_lock (&mutex[i]);
51 err = pthread_create (&tid[i], 0, foo, &mutex[i]);
52 if (err)
53 error (1, err, "pthread_create");
54 sched_yield ();
55 }
56
57 for (i = THREADS - 1; i >= 0; i--)
58 {
59 void *ret;
60 pthread_mutex_unlock (&mutex[i]);
61 err = pthread_join (tid[i], &ret);
62 if (err)
63 error (1, err, "pthread_join");
64 assert (ret == &mutex[i]);
65 }
66
67 return 0;
68 }
69