/*

 * Copyright (c) 2008 Apple Inc.  All rights reserved.

 *

 * @APPLE_DTS_LICENSE_HEADER_START@

 * 

 * IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

 * ("Apple") in consideration of your agreement to the following terms, and your

 * use, installation, modification or redistribution of this Apple software

 * constitutes acceptance of these terms.  If you do not agree with these terms,

 * please do not use, install, modify or redistribute this Apple software.

 * 

 * In consideration of your agreement to abide by the following terms, and

 * subject to these terms, Apple grants you a personal, non-exclusive license,

 * under Apple's copyrights in this original Apple software (the "Apple Software"),

 * to use, reproduce, modify and redistribute the Apple Software, with or without

 * modifications, in source and/or binary forms; provided that if you redistribute

 * the Apple Software in its entirety and without modifications, you must retain

 * this notice and the following text and disclaimers in all such redistributions

 * of the Apple Software.  Neither the name, trademarks, service marks or logos of

 * Apple Computer, Inc. may be used to endorse or promote products derived from

 * the Apple Software without specific prior written permission from Apple.  Except

 * as expressly stated in this notice, no other rights or licenses, express or

 * implied, are granted by Apple herein, including but not limited to any patent

 * rights that may be infringed by your derivative works or by other works in

 * which the Apple Software may be incorporated.

 * 

 * The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

 * WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

 * WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

 * COMBINATION WITH YOUR PRODUCTS. 

 * 

 * IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR

 * DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF

 * CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF

 * APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 * 

 * @APPLE_DTS_LICENSE_HEADER_END@

 */

#include <assert.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <sys/errno.h>

#include <mach/clock_types.h>

#include <dispatch/dispatch.h>

int main(int argc, char* argv[])

{

    dispatch_source_t theTimer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, dispatch_queue_create("timer queue",NULL));

    __block int i = 0;

    printf("Starting to count by seconds\n");

    dispatch_source_set_event_handler(theTimer, ^{

            printf("%d\n", ++i);

            if (i >= 6) {

                printf("i>6\n");

                dispatch_source_cancel(theTimer);

            }

            if (i == 3) {

                printf("switching to half seconds\n");

                dispatch_source_set_timer(theTimer, DISPATCH_TIME_NOW, NSEC_PER_SEC / 2, 0);

            }

    });

    dispatch_source_set_cancel_handler(theTimer, ^{

        printf("dispatch source canceled OK\n");

        dispatch_release(theTimer);

        exit(0);

    });

    dispatch_source_set_timer(theTimer, dispatch_time(DISPATCH_TIME_NOW,NSEC_PER_SEC) , NSEC_PER_SEC, 0);

    dispatch_resume(theTimer);

    dispatch_main();

    return 0;

}