1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/*
20 * This test program tests whether the one-time initialization in
21 * av_get_cpu_flags() has data races.
22 */
23
24#include <stdio.h>
25#include <string.h>
26
27#include "libavutil/cpu.h"
28#include "libavutil/thread.h"
29
30static void *thread_main(void *arg)
31{
32    int *flags = arg;
33
34    *flags = av_get_cpu_flags();
35    return NULL;
36}
37
38int main(void)
39{
40    int cpu_flags1;
41    int cpu_flags2;
42    int ret;
43    pthread_t thread1;
44    pthread_t thread2;
45
46    if ((ret = pthread_create(&thread1, NULL, thread_main, &cpu_flags1))) {
47        fprintf(stderr, "pthread_create failed: %s.\n", strerror(ret));
48        return 1;
49    }
50    if ((ret = pthread_create(&thread2, NULL, thread_main, &cpu_flags2))) {
51        fprintf(stderr, "pthread_create failed: %s.\n", strerror(ret));
52        return 1;
53    }
54    pthread_join(thread1, NULL);
55    pthread_join(thread2, NULL);
56
57    if (cpu_flags1 < 0)
58        return 2;
59    if (cpu_flags2 < 0)
60        return 2;
61    if (cpu_flags1 != cpu_flags2)
62        return 3;
63
64    return 0;
65}
66