- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    //正確認(rèn)識“當(dāng)前線程”
    dispatch_queue_t queue = dispatch_queue_create("ThirdConcurrentQueue", DISPATCH_QUEUE_CONCURRENT);
    dispatch_async(queue, ^{
        NSLog(@"并行隊(duì)列異步執(zhí)行開始%@", [NSThread currentThread]);
        //在同步執(zhí)行任務(wù)
        //當(dāng)前線程為子線程
        dispatch_sync(queue, ^{
            NSLog(@"XXXXX:%@", [NSThread currentThread]);
        });
    });
    
}

//串行隊(duì)列同步執(zhí)行
- (IBAction)serialQueueSync:(id)sender {
    /*明確點(diǎn)：任務(wù)的執(zhí)行順序; 主線程還是子線程執(zhí)行
    串行隊(duì)列: 順序地執(zhí)行
    同步執(zhí)行: 當(dāng)前線程 + 等待任務(wù)執(zhí)行完畢
     */
    //1.創(chuàng)建串行隊(duì)列(給定名字+指定隊(duì)列類型)
    NSLog(@"開始執(zhí)行啦:%@", [NSThread currentThread]);
    dispatch_queue_t queue = dispatch_queue_create("FirstSerialQueue", DISPATCH_QUEUE_SERIAL);
    //2.添加兩個任務(wù)到串行隊(duì)列中(block)
    //3.同步執(zhí)行兩個任務(wù)
    dispatch_sync(queue, ^{
        //添加第一個任務(wù)(耗時操作)
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"++++++++++%@",[NSThread currentThread]);
        }
    });
    NSLog(@"打印+結(jié)束");
 
    dispatch_sync(queue, ^{
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"----------%@", [NSThread currentThread]);
        }
    });
    NSLog(@"打印—結(jié)束");
}
//串行隊(duì)列異步執(zhí)行
- (IBAction)serialQueueAsync:(id)sender {
    /*
     串行隊(duì)列: 順序地執(zhí)行
     異步執(zhí)行: 子線程 + 立即返回(不等待任務(wù))
     */
    dispatch_queue_t queue = dispatch_queue_create("SecondSerialQueue", DISPATCH_QUEUE_SERIAL);
    dispatch_async(queue, ^{
        //添加到隊(duì)列中的任務(wù)
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"+++++++++%@", [NSThread currentThread]);
        }
    });
    NSLog(@"打印+完畢");
    dispatch_async(queue, ^{
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"-------%@",[NSThread currentThread]);
        }
    });
    NSLog(@"打印-完畢");
}
//并行隊(duì)列同步執(zhí)行
- (IBAction)concurrentQueueSync:(id)sender {
    /*
    并行隊(duì)列: 同時地執(zhí)行
    同步執(zhí)行: 當(dāng)前線程 + 等待任務(wù)執(zhí)行完畢
     */
    dispatch_queue_t queue = dispatch_queue_create("FirstConcurrentQueue", DISPATCH_QUEUE_CONCURRENT);
    dispatch_sync(queue, ^{
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"++++++++%@",[NSThread currentThread]);
        }
    });
    NSLog(@"打印+完畢");
    
    dispatch_sync(queue, ^{
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"--------%@",[NSThread currentThread]);
        }
    });
    NSLog(@"打印-完畢");
}
//并行隊(duì)列異步執(zhí)行
- (IBAction)concurrentQueueAsync:(id)sender {
    /*
     并行隊(duì)列: 同時地執(zhí)行
     異步執(zhí)行: 子線程 + 立即返回(不等待任務(wù))
     */
    dispatch_queue_t queue = dispatch_queue_create("SecondConcurrentQueue", DISPATCH_QUEUE_CONCURRENT);
    dispatch_async(queue, ^{
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"++++++++%@", [NSThread currentThread]);
        }
    });
    NSLog(@"打印+完畢");
    
    dispatch_async(queue, ^{
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"--------%@", [NSThread currentThread]);
        }
    });
    NSLog(@"打印-完畢");
}

//全局隊(duì)列異步執(zhí)行(掌握)
- (IBAction)globalQueueAsync:(id)sender {
    //結(jié)論和并行隊(duì)列異步執(zhí)行一樣
    //1.獲取全局隊(duì)列(只有這一步不一樣)
    /* 參數(shù)一：指定全局隊(duì)列的優(yōu)先級(主隊(duì)列優(yōu)先級最高)
     */
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    //2.添加任務(wù)
    dispatch_async(queue, ^{
        NSLog(@"++++++%@", [NSThread currentThread]);
    });
    //3.異步執(zhí)行任務(wù)
    NSLog(@"打印+完畢");
}
//主隊(duì)列異步執(zhí)行
- (IBAction)mainQueueAsync:(id)sender {
    //1.獲取主隊(duì)列
    dispatch_queue_t queue = dispatch_get_main_queue();
    //2.添加到主隊(duì)列
    dispatch_async(queue, ^{
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"+++++++++%@", [NSThread currentThread]);
        }
    });
    NSLog(@"打印+完畢");
    dispatch_async(queue, ^{
        for (int i = 0; i < 5; i++) {
            [NSThread sleepForTimeInterval:1];
            NSLog(@"---------%@", [NSThread currentThread]);
        }
    });
    NSLog(@"打印-完畢");
}
//主隊(duì)列同步執(zhí)行
- (IBAction)mainQueueSync:(id)sender {
//    dispatch_queue_t queue = dispatch_get_main_queue();
    NSLog(@"任務(wù)一");
    dispatch_sync(dispatch_get_main_queue(), ^{
        NSLog(@"任務(wù)二");
    });
    NSLog(@"任務(wù)三");
}