Download Concurrent Programming in Mac OS X and iOS: Unleash by Vandad Nahavandipoor PDF

By Vandad Nahavandipoor

Now that multicore processors are coming to cellular units, wouldn't or not it's nice to use all these cores with no need to regulate threads? This concise ebook indicates you ways to exploit Apple's Grand principal Dispatch (GCD) to simplify programming on multicore iOS units and Mac OS X.

Managing your application's assets on a couple of center isn't effortless, yet it's very important. Apps that use just one center in a multicore atmosphere will gradual to a move slowly. in case you understand how to application with Cocoa or Cocoa contact, this advisor gets you begun with GCD without delay, with many examples that can assist you write high-performing multithreaded apps.
•Package your code as block gadgets and invoke them with GCD
•Understand dispatch queues—the swimming pools of threads controlled by means of GCD
•Use varied tools for executing UI and non-UI initiatives
•Create a bunch of projects that GCD can run without warning
•Instruct GCD to execute initiatives just once or after a hold up
•Discover the right way to build your individual dispatch queues

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Extra resources for Concurrent Programming in Mac OS X and iOS: Unleash Multicore Performance with Grand Central Dispatch

Example text

It prints the integers 1 to 1000 twice, one complete sequence after the other, without blocking the main thread. We can create a block object that does the counting for us and synchronously call the same block object twice: void (^printFrom1To1000)(void) = ^{ NSUInteger counter = 0; for (counter = 1; counter <= 1000; counter++){ NSLog(@"Counter = %lu - Thread = %@", (unsigned long)counter, [NSThread currentThread]); } }; Performing Non-UI-Related Tasks Synchronously | 27 Now let’s go and invoke this block object using GCD: dispatch_queue_t concurrentQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_sync(concurrentQueue, printFrom1To1000); dispatch_sync(concurrentQueue, printFrom1To1000); If you run this code, you might notice the counting taking place on the main thread, even though you’ve asked a concurrent queue to execute the task.

The control used for the display depends on whether you are coding this for iOS (ideally, you’d use an instance of UITableView) or Mac OS X (NSTableView would be a good candidate). Since we don’t have an array, why don’t we create the array first, then load it, and finally display it? Here are two methods that will help us find the location where we want to save the array of 10,000 random numbers on disk on the device: - (NSString *) fileLocation{ /* Get the document folder(s) */ NSArray *folders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 32 | Chapter 2: Programming Grand Central Dispatch NSUserDomainMask, YES); /* Did we find anything?

You can use any of these values for the first parameter to the dispatch_get_global_queue function: DISPATCH_QUEUE_PRIORITY_LOW Fewer timeslices will be applied to your task than normal tasks. DISPATCH_QUEUE_PRIORITY_DEFAULT The default system priority for code execution will be applied to your task. DISPATCH_QUEUE_PRIORITY_HIGH More timeslices will be applied to your task than normal tasks. The second parameter of the dispatch_get_global_queue function is reserved and you should always pass the value 0 to it.

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