线程、同步异步、队列

 1  dispatch_queue_t _serialQueue = dispatch_queue_create("gao mao a", DISPATCH_QUEUE_SERIAL);
 2     //(两个队列，都是同步的时候，就没什么卵用了，一个队列就够了)
 3     dispatch_queue_t _gaomaoa  = dispatch_queue_create("gao maoss a", DISPATCH_QUEUE_SERIAL);
 4     
 5     NSLog(@"wo ca lei ge da ye =======  1  
");
 6     //同步
 7     dispatch_async(_gaomaoa, ^{
 8         NSLog(@"wo ca lei ge da ye =======  2  
");
 9         NSLog(@"wo ca lei ge da ye =======  2  
");
10         NSLog(@"wo ca lei ge da ye =======  2  
");
11         NSLog(@"wo ca lei ge da ye =======  2  
");
12         NSLog(@"wo ca lei ge da ye =======  2  
");
13     });
14     //异步
15     dispatch_sync(_serialQueue, ^{
16         NSLog(@"wo ca lei ge da ye =======  3  
");
17         NSLog(@"wo ca lei ge da ye =======  3  
");
18         NSLog(@"wo ca lei ge da ye =======  3  
");
19         NSLog(@"wo ca lei ge da ye =======  3  
");
20         NSLog(@"wo ca lei ge da ye =======  3  
");
21     });
22     
23     dispatch_sync(_serialQueue, ^{
24         NSLog(@"wo ca lei ge da ye =======  4  
");
25         NSLog(@"wo ca lei ge da ye =======  4  
");
26         NSLog(@"wo ca lei ge da ye =======  4  
");
27         NSLog(@"wo ca lei ge da ye =======  4  
");
28         NSLog(@"wo ca lei ge da ye =======  4  
");
29     });
30     
31     NSLog(@"wo ca lei ge da ye =======  5  
");
32     
33     NSLog(@"wo ca lei ge da ye =======  6  
");

打印结果

2016-03-29 16:33:07.522 neeq_second[903:130796] wo ca lei ge da ye ======= 1

2016-03-29 16:33:07.523 neeq_second[903:130796] wo ca lei ge da ye ======= 3

2016-03-29 16:33:07.523 neeq_second[903:130815] wo ca lei ge da ye ======= 2

2016-03-29 16:33:07.523 neeq_second[903:130796] wo ca lei ge da ye ======= 3

2016-03-29 16:33:07.523 neeq_second[903:130815] wo ca lei ge da ye ======= 2

2016-03-29 16:33:07.523 neeq_second[903:130796] wo ca lei ge da ye ======= 3

2016-03-29 16:33:07.523 neeq_second[903:130815] wo ca lei ge da ye ======= 2

2016-03-29 16:33:07.523 neeq_second[903:130796] wo ca lei ge da ye ======= 3

2016-03-29 16:33:07.523 neeq_second[903:130815] wo ca lei ge da ye ======= 2

2016-03-29 16:33:07.524 neeq_second[903:130796] wo ca lei ge da ye ======= 3

2016-03-29 16:33:07.524 neeq_second[903:130815] wo ca lei ge da ye ======= 2

2016-03-29 16:33:07.524 neeq_second[903:130796] wo ca lei ge da ye ======= 4

2016-03-29 16:33:07.525 neeq_second[903:130796] wo ca lei ge da ye ======= 4

2016-03-29 16:33:07.525 neeq_second[903:130796] wo ca lei ge da ye ======= 5

2016-03-29 16:33:07.525 neeq_second[903:130796] wo ca lei ge da ye ======= 6

让明天，不后悔今天的所作所为