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/*

 * Copyright (c) 2001-2004 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <test.h>

#include <arch.h>

#include <atomic.h>

#include <print.h>

#include <proc/thread.h>

#include <synch/waitq.h>

#include <synch/semaphore.h>

#define AT_ONCE			3

#define PRODUCERS		50

#define CONSUMERS		50

static semaphore_t sem;

static waitq_t can_start;

static atomic_t items_produced;

static atomic_t items_consumed;

static void producer(void *arg)

{

	thread_detach(THREAD);	

	waitq_sleep(&can_start);

	semaphore_down(&sem);

	atomic_inc(&items_produced);

	thread_usleep(250);

	semaphore_up(&sem);

}

static void consumer(void *arg)

{

	thread_detach(THREAD);	

	waitq_sleep(&can_start);

	semaphore_down(&sem);

	atomic_inc(&items_consumed);

	thread_usleep(500);

	semaphore_up(&sem);

}

char * test_semaphore1(bool quiet)

{

	int i, j, k;

	int consumers, producers;

	waitq_initialize(&can_start);

	semaphore_initialize(&sem, AT_ONCE);

	for (i = 1; i <= 3; i++) {

		thread_t *thrd;

		atomic_set(&items_produced, 0);

		atomic_set(&items_consumed, 0);

		consumers = i * CONSUMERS;

		producers = (4 - i) * PRODUCERS;

		printf("Creating %d consumers and %d producers...", consumers, producers);

		for (j = 0; j < (CONSUMERS + PRODUCERS) / 2; j++) {

			for (k = 0; k < i; k++) {

				thrd = thread_create(consumer, NULL, TASK, 0, "consumer", false);

				if (thrd)

					thread_ready(thrd);

				else

					printf("could not create consumer %d\n", i);

			}

			for (k = 0; k < (4 - i); k++) {

				thrd = thread_create(producer, NULL, TASK, 0, "producer", false);

				if (thrd)

					thread_ready(thrd);

				else

					printf("could not create producer %d\n", i);

			}

		}

		printf("ok\n");

		thread_sleep(1);

		waitq_wakeup(&can_start, WAKEUP_ALL);

		while ((items_consumed.count != consumers) || (items_produced.count != producers)) {

			printf("%d consumers remaining, %d producers remaining\n", consumers - items_consumed.count, producers - items_produced.count);

			thread_sleep(1);

		}

	}

	return NULL;

}