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 publication exhibits you the way to take advantage of Apple's Grand important Dispatch (GCD) to simplify programming on multicore iOS units and Mac OS X.

handling your application’s assets on a couple of center isn't effortless, yet it's very important. Apps that use just one middle in a multicore setting will gradual to a move slowly. if you happen to understand how to software with Cocoa or Cocoa contact, this consultant gets you began with GCD instantly, with many examples that will help you write high-performing multithreaded apps.
* package deal your code as block items and invoke them with GCD
* comprehend dispatch queues—the swimming pools of threads controlled via GCD
* Use diversified tools for executing UI and non-UI initiatives
* Create a gaggle of initiatives that GCD can run by surprise
* educate GCD to execute projects just once or after a hold up
* detect 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

If you want a piece of code to be executed at most once, you must specify the same token to this method whenever it is invoked in the app. We will see an example of this soon. Block object The block object to get executed at most once. This block object returns no values and accepts no parameters. dispatch_once always executes its task on the current queue being used by the code that issues the call, be it a serial queue, a concurrent queue, or the main queue. Here is an example: static dispatch_once_t onceToken; void (^executedOnlyOnce)(void) = ^{ static NSUInteger numberOfEntries = 0; numberOfEntries++; NSLog(@"Executed %lu time(s)", (unsigned long)numberOfEntries); }; - (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ dispatch_queue_t concurrentQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_once(&onceToken, ^{ dispatch_async(concurrentQueue, executedOnlyOnce); }); 38 | Chapter 2: Programming Grand Central Dispatch dispatch_once(&onceToken, ^{ dispatch_async(concurrentQueue, executedOnlyOnce); }); // Override point for customization after application launch.

Dispatch queue The dispatch queue on which the block object (specified by the third parameter) has to be executed after the given delay (specified by the first parameter). Performing Tasks After a Delay | 35 Block object The block object to be invoked after the specified number of nanoseconds on the given dispatch queue. This block object should have no return value and should accept no parameters (see “Constructing Block Objects and Their Syntax” on page 2). dispatch_after_f Dispatches a C function to GCD for execution after a given period of time, specified in nanoseconds.

All you have to do is to provide it with the handle of the queue that has to run the task and a block of code to execute on that queue. Let’s look at an example. 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.

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