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#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"touchesBegan");
// 异步函数 + 主队列
// 结论:1.不会开启新线程
// 2.任务按顺序执行
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"耗时操作1:%@",[NSThread currentThread]);
});
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"耗时操作2:%@",[NSThread currentThread]);
});
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"耗时操作3:%@",[NSThread currentThread]);
});
NSLog(@"touchesEnd");
}
// 异步函数 + 并发队列
// 任务在子线程执行/会开启多条新线程
// 任务同时执行
// 并不是有多少任务就开启多少线程.
- (void)test2
{
// 异步函数 + 并发队列
// 任务在子线程执行/会开启多条新线程
// 任务同时执行
// 并不是有多少任务就开启多少线程.
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"耗时操作1:%@",[NSThread currentThread]);
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"耗时操作2:%@",[NSThread currentThread]);
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"耗时操作3:%@",[NSThread currentThread]);
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"耗时操作4:%@",[NSThread currentThread]);
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"耗时操作5:%@",[NSThread currentThread]);
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"耗时操作6:%@",[NSThread currentThread]);
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"耗时操作7:%@",[NSThread currentThread]);
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"耗时操作8:%@",[NSThread currentThread]);
});
}
// 异步函数 + 串行队列
// 结论: 1.开启一条线程,任务在新线程中执行.
// 2.任务按顺序执行,在同一条子线程执行.
// 3.一个队列对应一条线程
- (void)test1
{
// 异步函数 + 串行队列
// 结论: 1.开启一条线程,任务在新线程中执行.
// 2.任务按顺序执行,在同一条子线程执行.
// 3.一个队列对应一条线程
dispatch_queue_t serialQueue1 = dispatch_queue_create("", DISPATCH_QUEUE_SERIAL);
dispatch_queue_t serialQueue2 = dispatch_queue_create("", DISPATCH_QUEUE_SERIAL);
dispatch_async(serialQueue1, ^{
NSLog(@"耗时操作1:%@",[NSThread currentThread]);
});
dispatch_async(serialQueue2, ^{
NSLog(@"耗时操作2:%@",[NSThread currentThread]);
});
dispatch_async(serialQueue2, ^{
NSLog(@"耗时操作3:%@",[NSThread currentThread]);
});
dispatch_async(serialQueue1, ^{
NSLog(@"耗时操作4:%@",[NSThread currentThread]);
});
}
@end
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原文地址：http://www.cnblogs.com/R-X-L/p/4777563.html
