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/* Test mutexes.
Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define _GNU_SOURCE
#include <pthread.h>
#include <assert.h>
#include <unistd.h>
#include <error.h>
#include <errno.h>
#include <stdio.h>
#define THREADS 500
void *
foo (void *arg)
{
pthread_mutex_t *mutex = arg;
pthread_mutex_lock (mutex);
pthread_mutex_unlock (mutex);
return mutex;
}
int
main (int argc, char **argv)
{
int i;
error_t err;
pthread_t tid[THREADS];
pthread_mutex_t mutex[THREADS];
for (i = 0; i < THREADS; i++)
{
pthread_mutex_init (&mutex[i], 0);
pthread_mutex_lock (&mutex[i]);
err = pthread_create (&tid[i], 0, foo, &mutex[i]);
if (err)
error (1, err, "pthread_create");
sched_yield ();
}
for (i = THREADS - 1; i >= 0; i--)
{
void *ret;
pthread_mutex_unlock (&mutex[i]);
err = pthread_join (tid[i], &ret);
if (err)
error (1, err, "pthread_join");
assert (ret == &mutex[i]);
}
return 0;
}
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