iOS并发处理的那些事(译自外文)

 

• -  (void) doCalculation{

  /* Do your calculation here */

  }

• -  (void) calculationThreadEntry{

  @autoreleasepool {
  NSUInteger counter = 0;
  while ([[NSThread currentThread] isCancelled] == NO){

  [self doCalculation];counter++;
  if (counter >= 1000){

  break;}

  }}

  }

• -  (BOOL) application:(UIApplication *)application

  didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{

  /* Start the thread */

• //这里用NSThread生成一个新的线程，calculationThreadEntry这个方法，在新的线程中执行。

• //其中这里需要注意的一点就是，calculationThreadEntry中得操作要放在自动释放池中进行。

• 
  

  [NSThread detachNewThreadSelector:@selector(calculationThreadEntry)

  toTarget:selfwithObject:nil];

  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

  self.window.backgroundColor = [UIColor whiteColor];

  [self.window makeKeyAndVisible];

  return YES;

• }

而如果我们要用GCD做同样的工作，则不用显得如此繁琐

dispatch_queue_t queue=dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0)；

        size_t numberOfIterations=1000;

       dispatch_async(queue, ^(void){dispatch_apply(numberOfIterations, queue,^(size_titeration){

0. /* Perform the operation here */

});});

妹的，csdn太难用了