/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* * This test program tests whether the one-time initialization in * av_get_cpu_flags() has data races. */ #include <stdio.h>#include <string.h> #include "libavutil/cpu.h"#include "libavutil/thread.h" static void *thread_main(void *arg){    int *flags = arg;     *flags = av_get_cpu_flags();    return NULL;} int main(void){    int cpu_flags1;    int cpu_flags2;    int ret;    pthread_t thread1;    pthread_t thread2;     if ((ret = pthread_create(&thread1, NULL, thread_main, &cpu_flags1))) {        fprintf(stderr, "pthread_create failed: %s.\n", strerror(ret));        return 1;    }    if ((ret = pthread_create(&thread2, NULL, thread_main, &cpu_flags2))) {        fprintf(stderr, "pthread_create failed: %s.\n", strerror(ret));        return 1;    }    pthread_join(thread1, NULL);    pthread_join(thread2, NULL);     if (cpu_flags1 < 0)        return 2;    if (cpu_flags2 < 0)        return 2;    if (cpu_flags1 != cpu_flags2)        return 3;     return 0;}