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/*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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;
}