//总结如下：

//1.同步请求：不会开启新的线程

//1-1.同步请求--串行队列：不开启新线程--按照顺序执行下去

//1-2.同步请求--并发列队：不开启新线程--按照顺序执行下去

//2.异步请求：会开启新的线程

//2-1.异步请求--串行队列：开启一条新线程--按照顺序执行下去

//2-2.异步请求--并发队列：每条请求开启一条新线程--无顺序执行

//3.主线程

//主线程上面的请求都会在主线程上面执行

//3-1.异步请求：在主线程上面不会开启新的线程--按照顺序执行下去

//3-2.同步请求：卡死  当触发同步请求的时候会立即触发这个方法，但是上面的方法还需要往下面走，相互之间卡死了。

- (void)viewDidLoad {

    [super viewDidLoad];

    [self test8];

}

//   <NSThread: 0x7fd2c3c088a0>{number = 1, name = main}

// 2><NSThread: 0x7fd2c3c14280>{number = 2, name = (null)}

// 4><NSThread: 0x7fd2c3c9a6a0>{number = 4, name = (null)}

// 3><NSThread: 0x7fd2c3e0c4b0>{number = 3, name = (null)}

// 1><NSThread: 0x7fd2c3e0d570>{number = 5, name = (null)}

// 5><NSThread: 0x7fd2c3c14280>{number = 2, name = (null)}

//异步队列--异步请求

//会创建新的线程--线程之间的执行时是并发的

-(void)test1{

    NSLog(@"%@",[NSThread currentThread]);

    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

    dispatch_async(queue, ^{

        NSLog(@"1>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"2>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"3>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"4>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"5>%@",[NSThread currentThread]);

    });

}

//结果如下

//   <NSThread: 0x7fd5bac04910>{number = 1, name = main}

// 1><NSThread: 0x7fd5bac04910>{number = 1, name = main}

// 2><NSThread: 0x7fd5bac04910>{number = 1, name = main}

// 3><NSThread: 0x7fd5bac04910>{number = 1, name = main}

// 4><NSThread: 0x7fd5bac04910>{number = 1, name = main}

// 5><NSThread: 0x7fd5bac04910>{number = 1, name = main}

//异步队列--同步请求

//并没有开启新的线程--还是在主线程上面串行的执行

-(void)test2{

    NSLog(@"%@",[NSThread currentThread]);

    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

    dispatch_sync(queue, ^{

        NSLog(@"1>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"2>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"3>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"4>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"5>%@",[NSThread currentThread]);

    });

}

//结果如下

//   <NSThread: 0x7fed50d07b50>{number = 1, name = main}

// 1><NSThread: 0x7fed50d07b50>{number = 1, name = main}

// 2><NSThread: 0x7fed50d07b50>{number = 1, name = main}

// 3><NSThread: 0x7fed50d07b50>{number = 1, name = main}

// 4><NSThread: 0x7fed50d07b50>{number = 1, name = main}

// 5><NSThread: 0x7fed50d07b50>{number = 1, name = main}

//串行队列--同步请求

//并没有开启新的线程--还是在主线程上面串行的执行

-(void)test3{

    NSLog(@"%@",[NSThread currentThread]);

    dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_SERIAL);

    dispatch_sync(queue, ^{

        NSLog(@"1>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"2>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"3>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"4>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"5>%@",[NSThread currentThread]);

    });

}

//结果如下

//   <NSThread: 0x7faa8a606430>{number = 1, name = main}

// 1><NSThread: 0x7faa8a61e880>{number = 2, name = (null)}

// 2><NSThread: 0x7faa8a61e880>{number = 2, name = (null)}

// 3><NSThread: 0x7faa8a61e880>{number = 2, name = (null)}

// 4><NSThread: 0x7faa8a61e880>{number = 2, name = (null)}

// 5><NSThread: 0x7faa8a61e880>{number = 2, name = (null)}

//串行队列--异步请求

//开启了一条新的线程--按照顺序执行

-(void)test4{

    NSLog(@"%@",[NSThread currentThread]);

    dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_SERIAL);

    dispatch_async(queue, ^{

        NSLog(@"1>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"2>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"3>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"4>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"5>%@",[NSThread currentThread]);

    });

}

//结果如下

//   <NSThread: 0x7fe849c048f0>{number = 1, name = main}

// 1><NSThread: 0x7fe849c048f0>{number = 1, name = main}

// 2><NSThread: 0x7fe849c048f0>{number = 1, name = main}

// 3><NSThread: 0x7fe849c048f0>{number = 1, name = main}

// 4><NSThread: 0x7fe849c048f0>{number = 1, name = main}

// 5><NSThread: 0x7fe849c048f0>{number = 1, name = main}

//主线程--异步请求

//不会开启新的线程，都是在主线程上面执行的

-(void)test5{

    NSLog(@"%@",[NSThread currentThread]);

    dispatch_queue_t queue = dispatch_get_main_queue();

    dispatch_async(queue, ^{

        NSLog(@"1>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"2>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"3>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"4>%@",[NSThread currentThread]);

    });

    dispatch_async(queue, ^{

        NSLog(@"5>%@",[NSThread currentThread]);

    });

}

//结果如下

// <NSThread: 0x7fe881501cc0>{number = 1, name = main}

//主线程--同步请求

//卡主线程

-(void)test6{

    NSLog(@"%@",[NSThread currentThread]);

    dispatch_queue_t queue = dispatch_get_main_queue();

    dispatch_sync(queue, ^{

        NSLog(@"1>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"2>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"3>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"4>%@",[NSThread currentThread]);

    });

    dispatch_sync(queue, ^{

        NSLog(@"5>%@",[NSThread currentThread]);

    });

}

//结果如下

//   <NSThread: 0x7fc70a7023c0>{number = 1, name = main}

// 2><NSThread: 0x7fc70a443ac0>{number = 2, name = (null)}

// 3><NSThread: 0x7fc70a61a740>{number = 4, name = (null)}

// 1><NSThread: 0x7fc70a70ea60>{number = 3, name = (null)}

// done

//开启多条线程

//统一完成后

-(void)test7{

    NSLog(@"%@",[NSThread currentThread]);

    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

    dispatch_group_t group = dispatch_group_create();

    dispatch_group_async(group, queue, ^{

        NSLog(@"1>%@",[NSThread currentThread]);

    });

    dispatch_group_async(group, queue, ^{

       NSLog(@"2>%@",[NSThread currentThread]);

    });

    dispatch_group_async(group, queue, ^{

        NSLog(@"3>%@",[NSThread currentThread]);

    });

    dispatch_group_notify(group, queue, ^{

        NSLog(@"done");

    });

}

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