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/* Test recursive 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 <error.h>
#include <errno.h>
#define THREADS 10
int foo;
void *
thr (void *arg)
{
int i;
pthread_mutex_lock (arg);
foo = pthread_self ();
for (i = 0; i < 500; i++)
pthread_mutex_lock (arg);
for (i = 0; i < 500; i++)
pthread_mutex_unlock (arg);
assert (foo == pthread_self ());
pthread_mutex_unlock (arg);
return 0;
}
int
main (int argc, char **argv)
{
error_t err;
int i;
pthread_t tid[THREADS];
pthread_mutexattr_t mattr;
pthread_mutex_t mutex;
err = pthread_mutexattr_init (&mattr);
if (err)
error (1, err, "pthread_mutexattr_init");
err = pthread_mutexattr_settype (&mattr, PTHREAD_MUTEX_RECURSIVE);
if (err)
error (1, err, "pthread_mutexattr_settype");
err = pthread_mutex_init (&mutex, &mattr);
if (err)
error (1, err, "pthread_mutex_init");
err = pthread_mutexattr_destroy (&mattr);
if (err)
error (1, err, "pthread_mutexattr_destroy");
pthread_mutex_lock (&mutex);
pthread_mutex_lock (&mutex);
pthread_mutex_unlock (&mutex);
pthread_mutex_unlock (&mutex);
for (i = 0; i < THREADS; i++)
{
err = pthread_create (&tid[i], 0, thr, &mutex);
if (err)
error (1, err, "pthread_create (%d)", i);
}
for (i = 0; i < THREADS; i++)
{
void *ret;
err = pthread_join (tid[i], &ret);
if (err)
error (1, err, "pthread_join");
assert (ret == 0);
}
err = pthread_mutex_destroy (&mutex);
if (err)
error (1, err, "pthread_mutex_destroy");
return 0;
}
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