/*
 * Copyright (c) 2008-2011 Apple Inc. All rights reserved.
 *
 * @APPLE_APACHE_LICENSE_HEADER_START@
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @APPLE_APACHE_LICENSE_HEADER_END@
 */

#include <dispatch/dispatch.h>
#include <stdio.h>

#include <bsdtests.h>
#include "dispatch_test.h"

uint32_t count = 0;
const uint32_t final = 1000000; // 10M

static void
pingpongloop(dispatch_group_t group, dispatch_queue_t ping, dispatch_queue_t pong, size_t counter)
{
	//printf("[%p] %s: %lu\n", (void*)(uintptr_t)pthread_self(), dispatch_queue_get_label(dispatch_get_current_queue()), counter);
	if (counter < final) {
		dispatch_group_async(group, pong, ^{ pingpongloop(group, pong, ping, counter+1); });
	} else {
		count = (uint32_t)counter;
	}
}

int
main(void)
{
	dispatch_test_start("Dispatch Ping Pong");

	dispatch_queue_t ping = dispatch_queue_create("ping", NULL);
	test_ptr_notnull("dispatch_queue_create(ping)", ping);
	dispatch_queue_t pong = dispatch_queue_create("pong", NULL);
	test_ptr_notnull("dispatch_queue_create(pong)", pong);

	dispatch_group_t group = dispatch_group_create();
	test_ptr_notnull("dispatch_group_create", group);

	pingpongloop(group, ping, pong, 0);
	dispatch_group_wait(group, DISPATCH_TIME_FOREVER);

	test_long("count", count, final);

	dispatch_release(ping);
	dispatch_release(pong);
	dispatch_release(group);

	test_stop();

	return 0;
}