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/*
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
#include <library.h>
#include <threading/mutex.h>
#include <unistd.h>
#include <sched.h>
#include <pthread.h>
static mutex_t *mutex;
static int locked = 0;
static bool failed = FALSE;
static pthread_barrier_t barrier;
static void* run(void* null)
{
int i;
/* wait for all threads before getting in action */
pthread_barrier_wait(&barrier);
for (i = 0; i < 100; i++)
{
mutex->lock(mutex);
mutex->lock(mutex);
mutex->lock(mutex);
locked++;
sched_yield();
if (locked > 1)
{
failed = TRUE;
}
locked--;
mutex->unlock(mutex);
mutex->unlock(mutex);
mutex->unlock(mutex);
}
return NULL;
}
#define THREADS 20
/*******************************************************************************
* mutex test
******************************************************************************/
bool test_mutex()
{
int i;
pthread_t threads[THREADS];
mutex = mutex_create(MUTEX_TYPE_RECURSIVE);
for (i = 0; i < 10; i++)
{
mutex->lock(mutex);
mutex->unlock(mutex);
}
for (i = 0; i < 10; i++)
{
mutex->lock(mutex);
}
for (i = 0; i < 10; i++)
{
mutex->unlock(mutex);
}
pthread_barrier_init(&barrier, NULL, THREADS);
for (i = 0; i < THREADS; i++)
{
pthread_create(&threads[i], NULL, run, NULL);
}
for (i = 0; i < THREADS; i++)
{
pthread_join(threads[i], NULL);
}
pthread_barrier_destroy(&barrier);
mutex->destroy(mutex);
return !failed;
}
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