Easy example of Grand Central Dispatch

Question

I\'m newbie programming for mac and i\'m really surprised on Grand Central Dispatch. I read about that and looks like the perfect solution for parallel programming. I worked wit

Answer 1

It would be something like this:

// The block replaces your doLoop function, it basically does the same thing
dispatch_block_t myBlock = ^{
    int i;          /* counter, to print numbers */
    int j;          /* counter, for delay        */

    dispatch_queue_t me = dispatch_get_current_queue();     /* The queue which currently runs this block */

    for (i=0; i<10; i++) 
    {
        for (j=0; j<500000; j++) /* delay loop */
            ;


        printf("'%s' - Got '%d'\n", dispatch_queue_get_label(me), i); // Print the name of the queue
    }
};


// Create two queues
dispatch_queue_t queue1 = dispatch_queue_create("my.totally.unique.and.reverse.dns.identifier.1", NULL);
dispatch_queue_t queue2 = dispatch_queue_create("my.totally.unique.and.reverse.dns.identifier.2", NULL);

// Let both execute the block
dispatch_async(queue1, myBlock);
dispatch_async(queue2, myBlock);

// And then release the queues because we are great citizens who care about memory
dispatch_release(queue1);
dispatch_release(queue2);