1 /* Test pthread_mutex_timedlock.
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 <stdio.h>
23 #include <assert.h>
24 #include <error.h>
25 #include <errno.h>
26 #include <sys/time.h>
27
28 int
main(int argc,char ** argv)29 main (int argc, char **argv)
30 {
31 error_t err;
32 struct timespec ts;
33 pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
34 struct timeval before, after;
35 int diff;
36
37 gettimeofday (&before, 0);
38 ts.tv_sec = before.tv_sec + 1;
39 ts.tv_nsec = before.tv_usec * 1000;
40
41 printf ("Starting wait @ %d\n", (int) before.tv_sec);
42
43 pthread_mutex_lock (&m);
44 /* A default mutex shall dead lock if locked twice. As such we do
45 not need spawn a second thread. */
46 err = pthread_mutex_timedlock (&m, &ts);
47 assert (err == ETIMEDOUT);
48
49 gettimeofday (&after, 0);
50
51 printf ("End wait @ %d\n", (int) after.tv_sec);
52
53 diff = after.tv_sec * 1000000 + after.tv_usec
54 - before.tv_sec * 1000000 - before.tv_usec;
55
56 if (diff < 900000 || diff > 1100000)
57 error (1, EGRATUITOUS, "pthread_mutex_timedlock waited %d us", diff);
58
59 return 0;
60 }
61