iOS 多线程的简单理解（3）执行方式 + 执行对列的组合

时间：2017-12-21 12:01:27 阅读：229 评论：0 收藏：0 [点我收藏+]

标签：分享图片 isp height dispatch sync syn nsthread void ios

通过对前面两偏线程理解的总结，自己对线程的理解也逐渐加深，梳理的清晰起来……

通常在使用线程的时候，都是要用到执行对列，执行方式，执行任务，

现在开始新一轮的深入

3. 1. 1 同步 + 串行

- (void)syncSerialQueue{
    
    dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_SERIAL);

    NSLog(@" 同步 + 串行 start：：：%@ ",[NSThread currentThread]);

    dispatch_sync(queue, ^{ // 添加任务 1
        for (int i = 0; i < 3; i++) {
            NSLog(@"同步 + 串行   index %d ::: %@",i,[NSThread currentThread]);
        }
    });
    
    dispatch_sync(queue, ^{  // 添加任务 2
        for (int i = 10; i < 13; i++) {
            NSLog(@"同步 + 串行   index %d ::: %@",i,[NSThread currentThread]);
        }
    });
    NSLog(@"同步 + 串行  end ：：：%@",[NSThread currentThread]);
}

执行结果：：：

2017-12-21 09:10:16.725075+0800 DeadThread[10455:3327379]  同步 + 串行 start：：：<NSThread: 0x60800006b4c0>{number = 1, name = main} 
2017-12-21 09:10:16.725222+0800 DeadThread[10455:3327379] 同步 + 串行   index 0 ::: <NSThread: 0x60800006b4c0>{number = 1, name = main}
2017-12-21 09:10:16.725339+0800 DeadThread[10455:3327379] 同步 + 串行   index 1 ::: <NSThread: 0x60800006b4c0>{number = 1, name = main}
2017-12-21 09:10:16.725530+0800 DeadThread[10455:3327379] 同步 + 串行   index 2 ::: <NSThread: 0x60800006b4c0>{number = 1, name = main}
2017-12-21 09:10:16.725615+0800 DeadThread[10455:3327379] 同步 + 串行   index 10 ::: <NSThread: 0x60800006b4c0>{number = 1, name = main}
2017-12-21 09:10:16.725765+0800 DeadThread[10455:3327379] 同步 + 串行   index 11 ::: <NSThread: 0x60800006b4c0>{number = 1, name = main}
2017-12-21 09:10:16.725821+0800 DeadThread[10455:3327379] 同步 + 串行   index 12 ::: <NSThread: 0x60800006b4c0>{number = 1, name = main}
2017-12-21 09:10:16.725870+0800 DeadThread[10455:3327379] 同步 + 串行  end ：：：<NSThread: 0x60800006b4c0>{number = 1, name = main}

总结结果：：：

1. 同步：在当前线程执行，不开启新的线程，任务顺序执行

2. 串行：添加的任务顺序排列，顺序执行

图示：：：：

技术分享图片

3.1.2 同步 + 并行

- (void)syncConcurrentQueue{
    
    dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_CONCURRENT);
    
    NSLog(@"同步 + 并行 start：：：%@ ",[NSThread currentThread]);
    
    dispatch_sync(queue, ^{
        for (int i = 0; i < 3; i++) {
            NSLog(@"同步 + 并行   index %d ::: %@",i,[NSThread currentThread]);
        }
    });
    
    dispatch_sync(queue, ^{
        for (int i = 10; i < 13; i++) {
            NSLog(@"同步 + 并行  index %d ::: %@",i,[NSThread currentThread]);
        }
    });
    
    NSLog(@"同步 + 并行  end ：：：%@",[NSThread currentThread]);
}

执行结果：：：

2017-12-21 09:37:05.376797+0800 DeadThread[10595:3430843] 同步 + 并行 start：：：<NSThread: 0x6040000759c0>{number = 1, name = main} 
2017-12-21 09:37:05.376915+0800 DeadThread[10595:3430843] 同步 + 并行   index 0 ::: <NSThread: 0x6040000759c0>{number = 1, name = main}
2017-12-21 09:37:05.377000+0800 DeadThread[10595:3430843] 同步 + 并行   index 1 ::: <NSThread: 0x6040000759c0>{number = 1, name = main}
2017-12-21 09:37:05.377101+0800 DeadThread[10595:3430843] 同步 + 并行   index 2 ::: <NSThread: 0x6040000759c0>{number = 1, name = main}
2017-12-21 09:37:05.377262+0800 DeadThread[10595:3430843] 同步 + 并行  index 10 ::: <NSThread: 0x6040000759c0>{number = 1, name = main}
2017-12-21 09:37:05.377372+0800 DeadThread[10595:3430843] 同步 + 并行  index 11 ::: <NSThread: 0x6040000759c0>{number = 1, name = main}
2017-12-21 09:37:05.377440+0800 DeadThread[10595:3430843] 同步 + 并行  index 12 ::: <NSThread: 0x6040000759c0>{number = 1, name = main}
2017-12-21 09:37:05.377514+0800 DeadThread[10595:3430843] 同步 + 并行  end ：：：<NSThread: 0x6040000759c0>{number = 1, name = main}

总结结果：：：

1. 同步：在当前线程执行，不开启新的线程，任务顺序执行

2. 并行：添加的任务不是顺序排列

图示：：：：

技术分享图片

3.2.1 异步 + 串行

- (void)asyncSerialQueue{
    
    dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_SERIAL);
    
    NSLog(@"异步 + 串行 start：：：%@ ",[NSThread currentThread]);
    
    dispatch_async(queue, ^{
        for (int i = 0; i < 3; i++) {
            NSLog(@"异步 + 串行   index %d ::: %@",i,[NSThread currentThread]);
        }
    });
    
    dispatch_async(queue, ^{
        for (int i = 10; i < 13; i++) {
            NSLog(@"异步 + 串行   index %d ::: %@",i,[NSThread currentThread]);
        }
    });
    
    NSLog(@"异步 + 串行  end ：：：%@",[NSThread currentThread]);
}

执行结果：：：：

2017-12-21 09:43:04.903888+0800 DeadThread[10647:3468013] 异步 + 串行 start：：：<NSThread: 0x60c0000654c0>{number = 1, name = main} 
2017-12-21 09:43:04.904032+0800 DeadThread[10647:3468013] 异步 + 串行  end ：：：<NSThread: 0x60c0000654c0>{number = 1, name = main}
2017-12-21 09:43:04.904056+0800 DeadThread[10647:3468266] 异步 + 串行   index 0 ::: <NSThread: 0x604000074580>{number = 3, name = (null)}
2017-12-21 09:43:04.904127+0800 DeadThread[10647:3468266] 异步 + 串行   index 1 ::: <NSThread: 0x604000074580>{number = 3, name = (null)}
2017-12-21 09:43:04.904180+0800 DeadThread[10647:3468266] 异步 + 串行   index 2 ::: <NSThread: 0x604000074580>{number = 3, name = (null)}
2017-12-21 09:43:04.904370+0800 DeadThread[10647:3468266] 异步 + 串行   index 10 ::: <NSThread: 0x604000074580>{number = 3, name = (null)}
2017-12-21 09:43:04.904534+0800 DeadThread[10647:3468266] 异步 + 串行   index 11 ::: <NSThread: 0x604000074580>{number = 3, name = (null)}
2017-12-21 09:43:04.904603+0800 DeadThread[10647:3468266] 异步 + 串行   index 12 ::: <NSThread: 0x604000074580>{number = 3, name = (null)}

总结结果：：：

1.异步：开启新的线程，不影响当前线程；

2.串行：添加任务顺序排列，顺序执行

技术分享图片

3.2.2 异步 + 并行

- (void)asyncConcurrentQueue{
    
    dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_CONCURRENT);
    
    NSLog(@"异步 + 并行 start：：：%@ ",[NSThread currentThread]);
    
    dispatch_async(queue, ^{
        for (int i = 0; i < 3; i++) {
            NSLog(@"异步 + 并行   index %d ::: %@",i,[NSThread currentThread]);
        }
    });
    
    dispatch_async(queue, ^{
        for (int i = 10; i < 13; i++) {
            NSLog(@"异步 + 并行  index %d ::: %@",i,[NSThread currentThread]);
        }
    });
    
    NSLog(@"同步 + 并行  end ：：：%@",[NSThread currentThread]);
}

执行结果：：：

2017-12-21 09:50:40.207852+0800 DeadThread[10727:3517966] 异步 + 并行 start：：：<NSThread: 0x60c00006d880>{number = 1, name = main} 
2017-12-21 09:50:40.208038+0800 DeadThread[10727:3517966] 同步 + 并行  end ：：：<NSThread: 0x60c00006d880>{number = 1, name = main}
2017-12-21 09:50:40.208045+0800 DeadThread[10727:3518055] 异步 + 并行  index 10 ::: <NSThread: 0x60400006f3c0>{number = 3, name = (null)}
2017-12-21 09:50:40.208066+0800 DeadThread[10727:3518052] 异步 + 并行   index 0 ::: <NSThread: 0x600000075700>{number = 4, name = (null)}
2017-12-21 09:50:40.208139+0800 DeadThread[10727:3518055] 异步 + 并行  index 11 ::: <NSThread: 0x60400006f3c0>{number = 3, name = (null)}
2017-12-21 09:50:40.208197+0800 DeadThread[10727:3518052] 异步 + 并行   index 1 ::: <NSThread: 0x600000075700>{number = 4, name = (null)}
2017-12-21 09:50:40.208327+0800 DeadThread[10727:3518055] 异步 + 并行  index 12 ::: <NSThread: 0x60400006f3c0>{number = 3, name = (null)}
2017-12-21 09:50:40.208361+0800 DeadThread[10727:3518052] 异步 + 并行   index 2 ::: <NSThread: 0x600000075700>{number = 4, name = (null)}

总结结果：：：：

1.异步：开启线程能力；

2.并行：任务队列不顺序排列，同时执行；

3.开启线程的数量：取决于添加任务的数量

图示：：：

技术分享图片