iOS多線程總結(jié)1-GCD

iOS多線程編程

寫在前面梨熙，歡迎互相交流荚板，歡迎指出錯(cuò)誤戴涝；

基本概念

進(jìn)程：計(jì)算機(jī)中的程序關(guān)于某數(shù)據(jù)集合上的一次運(yùn)行活動(dòng)，是系統(tǒng)進(jìn)行資源分配和調(diào)度的基本單位斋竞，是操作系統(tǒng)結(jié)構(gòu)的基礎(chǔ)倔约。

線程：是進(jìn)程中的一個(gè)實(shí)體，是被系統(tǒng)獨(dú)立調(diào)度和分派的基本單位坝初，線程自己不擁有系統(tǒng)資源浸剩，只擁有一點(diǎn)兒在運(yùn)行中必不可少的資源，但它可與同屬一個(gè)進(jìn)程的其它線程共享進(jìn)程所擁有的全部資源脖卖。

進(jìn)程：就是指一個(gè)可執(zhí)行的程序乒省；
線程：指代一個(gè)獨(dú)立執(zhí)行的代碼路徑；
參考自小笨狼漫談多線程

進(jìn)程和線程：

推薦阮一峰的《進(jìn)程與線程的一個(gè)簡單解釋》
http://www.ruanyifeng.com/blog/2013/04/processes_and_threads.html

GCD

推薦閱讀《土土哥的GCD使用經(jīng)驗(yàn)與技巧淺談》

任務(wù)和隊(duì)列

任務(wù)：

任務(wù)是在線程中執(zhí)行的畦木；具體分為：

同步任務(wù)dispatch_sync;
異步任務(wù)dispatch_async;

兩者的區(qū)別是：同步sync和異步async的區(qū)別在于會(huì)不會(huì)阻塞當(dāng)前線程袖扛；

隊(duì)列：

隊(duì)列只是負(fù)責(zé)任務(wù)的調(diào)度，而不負(fù)責(zé)任務(wù)的執(zhí)行十籍；具體分為串行隊(duì)列serial queue和并行隊(duì)列concurrent queue;

隊(duì)列的特點(diǎn)：

先進(jìn)先出FIFO蛆封，排在前面的任務(wù)最先執(zhí)行;
串行隊(duì)列：任務(wù)按照順序被調(diào)度，前一個(gè)任務(wù)不執(zhí)行完畢勾栗，隊(duì)列不會(huì)調(diào)度;
并行隊(duì)列：只要有空閑的線程惨篱，隊(duì)列就會(huì)調(diào)度當(dāng)前任務(wù)，交給線程去執(zhí)行围俘，不需要考慮前面是不是有任務(wù)在執(zhí)行砸讳、有沒有執(zhí)行完畢琢融，只要有線程可以利用，隊(duì)列就會(huì)調(diào)度任務(wù)簿寂。

討論幾種情況：

Tips：主隊(duì)列是全局串行隊(duì)列

主隊(duì)列main queue, 異步任務(wù)async task

特別注意：雖然是異步任務(wù)漾抬，但是主隊(duì)列并不會(huì)創(chuàng)建新的線程，任務(wù)會(huì)在主線程順序執(zhí)行常遂；

dispatch_queue_t queue = dispatch_get_main_queue();
dispatch_async(queue, ^{
    sleep(3);
    NSLog(@"%@", [NSThread currentThread]);
    NSLog(@"operation1 ..");
});

dispatch_async(queue, ^{
    sleep(2);
    NSLog(@"%@", [NSThread currentThread]);
    NSLog(@"operation2 ..");
});

dispatch_async(queue, ^{
    sleep(1);
    NSLog(@"%@", [NSThread currentThread]);
    NSLog(@"operation3 ..");
});

2017-09-20 10:42:46.153353 iOSSyncDemo[15164:4338648] <NSThread: 0x17407cf40>{number = 1, name = main}
2017-09-20 10:42:46.153575 iOSSyncDemo[15164:4338648] operation1 ..
2017-09-20 10:42:48.155361 iOSSyncDemo[15164:4338648] <NSThread: 0x17407cf40>{number = 1, name = main}
2017-09-20 10:42:48.155553 iOSSyncDemo[15164:4338648] operation2 ..
2017-09-20 10:42:49.157272 iOSSyncDemo[15164:4338648] <NSThread: 0x17407cf40>{number = 1, name = main}
2017-09-20 10:42:49.157467 iOSSyncDemo[15164:4338648] operation3 ..

主隊(duì)列main queue纳令，同步任務(wù)sync task，這種情況下克胳，會(huì)徹底卡死主線程;

dispatch_queue_t queue = dispatch_get_main_queue();
NSLog(@"start ...");
dispatch_sync(queue, ^{
    sleep(2);
    NSLog(@"operation1 ...");
});
NSLog(@"finished");

  2017-09-20 10:47:51.087949 iOSSyncDemo[15169:4341123] start ...
(lldb)

其他串行隊(duì)列other serial queue平绩，異步任務(wù)async task，這種情況下漠另，會(huì)創(chuàng)建新的線程捏雌，然后在新的線程上順序執(zhí)行任務(wù)；

dispatch_queue_t queue = dispatch_queue_create("com.investment.SERIAL", DISPATCH_QUEUE_SERIAL);
dispatch_async(queue, ^{
    sleep(3);
    NSLog(@"%@", [NSThread currentThread]);
    NSLog(@"operation1 ..");
});

dispatch_async(queue, ^{
    sleep(2);
    NSLog(@"%@", [NSThread currentThread]);
    NSLog(@"operation2 ..");
});

dispatch_async(queue, ^{
    sleep(1);
    NSLog(@"%@", [NSThread currentThread]);
    NSLog(@"operation3 ..");
})笆搓；

    2017-09-20 10:21:01.822707 iOSSyncDemo[15148:4335599] <NSThread: 0x174260240>{number = 3, name = (null)}
2017-09-20 10:21:01.822949 iOSSyncDemo[15148:4335599] operation1 ..
2017-09-20 10:21:02.825276 iOSSyncDemo[15148:4335599] <NSThread: 0x174260240>{number = 3, name = (null)}
2017-09-20 10:21:02.825468 iOSSyncDemo[15148:4335599] operation2 ..
2017-09-20 10:21:03.831180 iOSSyncDemo[15148:4335599] <NSThread: 0x174260240>{number = 3, name = (null)}
2017-09-20 10:21:03.831372 iOSSyncDemo[15148:4335599] operation3 ..

其他串行隊(duì)列other serial queue腹忽，同步步任務(wù)sync task，這種情況下砚作，任務(wù)會(huì)在主線程順序執(zhí)行窘奏；

    dispatch_queue_t queue = dispatch_queue_create("com.investment.SERIAL", DISPATCH_QUEUE_SERIAL);
dispatch_async(queue, ^{
    sleep(3);
    NSLog(@"%@", [NSThread currentThread]);
    NSLog(@"operation1 ..");
});

dispatch_async(queue, ^{
    sleep(2);
    NSLog(@"%@", [NSThread currentThread]);
    NSLog(@"operation2 ..");
});

dispatch_async(queue, ^{
    sleep(1);
    NSLog(@"%@", [NSThread currentThread]);
    NSLog(@"operation3 ..");
});

    2017-09-20 10:57:52.900571 iOSSyncDemo[15178:4342726] <NSThread: 0x174077c80>{number = 1, name = main}
2017-09-20 10:57:52.900780 iOSSyncDemo[15178:4342726] operation1 ..
2017-09-20 10:57:54.902541 iOSSyncDemo[15178:4342726] <NSThread: 0x174077c80>{number = 1, name = main}
2017-09-20 10:57:54.902735 iOSSyncDemo[15178:4342726] operation2 ..
2017-09-20 10:57:55.904303 iOSSyncDemo[15178:4342726] <NSThread: 0x174077c80>{number = 1, name = main}
2017-09-20 10:57:55.904500 iOSSyncDemo[15178:4342726] operation3 ..

并發(fā)隊(duì)列concurrent queue, 異步任務(wù)async task，這種情況下葫录，會(huì)為每個(gè)任務(wù)新建線程着裹，并放到新線程上執(zhí)行(注意：線程和任務(wù)一一對應(yīng))。

dispatch_queue_t queue = dispatch_queue_create("com.investment.CONCURRENT", DISPATCH_QUEUE_CONCURRENT);
// 并發(fā)隊(duì)列 異步執(zhí)行
dispatch_async(queue, ^{
    sleep(3);
    NSLog(@"concurrentQueue async task1: %@", [NSThread currentThread]);
});

dispatch_async(queue, ^{
    sleep(2);
    NSLog(@"concurrentQueue async task2: %@", [NSThread currentThread]);
});

dispatch_async(queue, ^{
    sleep(1);
    NSLog(@"concurrentQueue async task3: %@", [NSThread currentThread]);
});

dispatch_async(queue, ^{
    NSLog(@"concurrentQueue async task4: %@", [NSThread currentThread]);
});

    2017-09-20 11:09:27.772133 iOSSyncDemo[15186:4344364] concurrentQueue async task4: <NSThread: 0x1742673c0>{number = 3, name = (null)}
2017-09-20 11:09:28.777422 iOSSyncDemo[15186:4344365] concurrentQueue async task3: <NSThread: 0x1700785c0>{number = 4, name = (null)}
2017-09-20 11:09:29.777229 iOSSyncDemo[15186:4344366] concurrentQueue async task2: <NSThread: 0x170262440>{number = 5, name = (null)}
2017-09-20 11:09:30.777152 iOSSyncDemo[15186:4344363] concurrentQueue async task1: <NSThread: 0x170262480>{number = 6, name = (null)}

并發(fā)隊(duì)列concurrent queue, 同步任務(wù)sync task米同，這種情況下骇扇，所有任務(wù)會(huì)在當(dāng)前線程順序執(zhí)行。

    dispatch_queue_t queue = dispatch_queue_create("com.investment.CONCURRENT", DISPATCH_QUEUE_CONCURRENT);
// 并發(fā)隊(duì)列 異步執(zhí)行
dispatch_sync(queue, ^{
    sleep(3);
    NSLog(@"concurrentQueue async task1: %@", [NSThread currentThread]);
});

dispatch_sync(queue, ^{
    sleep(2);
    NSLog(@"concurrentQueue async task2: %@", [NSThread currentThread]);
});

dispatch_sync(queue, ^{
    sleep(1);
    NSLog(@"concurrentQueue async task3: %@", [NSThread currentThread]);
});

dispatch_sync(queue, ^{
    NSLog(@"concurrentQueue async task4: %@", [NSThread currentThread]);
});

    2017-09-20 11:11:57.385978 iOSSyncDemo[15189:4344846] concurrentQueue async task1: <NSThread: 0x174076300>{number = 1, name = main}
2017-09-20 11:11:59.387875 iOSSyncDemo[15189:4344846] concurrentQueue async task2: <NSThread: 0x174076300>{number = 1, name = main}
2017-09-20 11:12:00.389544 iOSSyncDemo[15189:4344846] concurrentQueue async task3: <NSThread: 0x174076300>{number = 1, name = main}
2017-09-20 11:12:00.389850 iOSSyncDemo[15189:4344846] concurrentQueue async task4: <NSThread: 0x174076300>{number = 1, name = main}

主隊(duì)列：這是一個(gè)特殊的串行隊(duì)列面粮。所有的UI操作都在這個(gè)隊(duì)列上;

dispatch_get_main_queue()

全局并行隊(duì)列：這是系統(tǒng)提供的一個(gè)并發(fā)隊(duì)列;

dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)

dispatch_group

dispatch_group_enter和dispatch_group_leave

    dispatch_group_t group = dispatch_group_create();
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_group_async(group, queue, ^{
    dispatch_async(queue, ^{
        sleep(2);
        NSLog(@"group task1 executing...");
    });
    NSLog(@"group task1 finished");
});

dispatch_group_async(group, queue, ^{
    dispatch_async(queue, ^{
        sleep(2);
        NSLog(@"group task2 executing...");
    });
    NSLog(@"group task2 finished");
});

dispatch_group_async(group, queue, ^{
    dispatch_async(queue, ^{
        sleep(2);
        NSLog(@"group task3 executing...");
    });
    NSLog(@"group task3 finished");
});

dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    NSLog(@"all group task finished");
});

2017-09-20 11:20:48.762150 iOSSyncDemo[15197:4347820] group task1 finished
2017-09-20 11:20:48.762258 iOSSyncDemo[15197:4347820] group task2 finished
2017-09-20 11:20:48.762629 iOSSyncDemo[15197:4347820] group task3 finished
2017-09-20 11:20:48.770034 iOSSyncDemo[15197:4347795] all group task finished
2017-09-20 11:20:50.768016 iOSSyncDemo[15197:4347817] group task1 executing...
2017-09-20 11:20:50.769131 iOSSyncDemo[15197:4347820] group task2 executing...
2017-09-20 11:20:50.769255 iOSSyncDemo[15197:4347818] group task3 executing...

通過log我們可以發(fā)現(xiàn)少孝，在子線程的任務(wù)還沒有完成的情況下；組任務(wù)就直接完成熬苍，這顯然不是我們想要的結(jié)果稍走；現(xiàn)在改進(jìn)一下：

    dispatch_group_t group = dispatch_group_create();
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_group_enter(group);
    dispatch_async(queue, ^{
        NSLog(@"group task1 executing...");
        sleep(3);
        NSLog(@"group task1 finished");
        dispatch_group_leave(group);
    });
    
    dispatch_group_enter(group);
    dispatch_async(queue, ^{
        NSLog(@"group task2 executing...");
        sleep(2);
        NSLog(@"group task2 finished");
        dispatch_group_leave(group);
    });
    
    dispatch_group_enter(group);
    dispatch_async(queue, ^{
        NSLog(@"group task3 executing...");
        sleep(1);
        NSLog(@"group task3 finished");
        dispatch_group_leave(group);
    });
    
    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        NSLog(@"all group task finished");
    });

2017-09-20 11:30:32.554690 iOSSyncDemo[15212:4350152] group task1 executing...
2017-09-20 11:30:32.554844 iOSSyncDemo[15212:4350156] group task2 executing...
2017-09-20 11:30:32.555487 iOSSyncDemo[15212:4350154] group task3 executing...
2017-09-20 11:30:33.560874 iOSSyncDemo[15212:4350154] group task3 finished
2017-09-20 11:30:34.560076 iOSSyncDemo[15212:4350156] group task2 finished
2017-09-20 11:30:35.560065 iOSSyncDemo[15212:4350152] group task1 finished
2017-09-20 11:30:35.560380 iOSSyncDemo[15212:4350130] all group task finished

這個(gè)時(shí)候就達(dá)到我們想要的結(jié)果了。

常規(guī)用法柴底，這種用法在開發(fā)中可以應(yīng)用的場景不多婿脸，更多的情況是上面那種并發(fā)隊(duì)列多異步任務(wù)嵌套的情況。

dispatch_group_t group = dispatch_group_create();
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_group_async(group, queue, ^{
    sleep(2);
    NSLog(@"group task1 finished");
});

dispatch_group_async(group, queue, ^{
    sleep(2);
    NSLog(@"group task2 finished");
});

dispatch_group_async(group, queue, ^{
    sleep(2);
    NSLog(@"group task3 finished");
});

dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    NSLog(@"all group task finished");
});

dispatch_group_wait(group, DISPATCH_TIME_FOREVER);

NSLog(@"after wait ..");

打印結(jié)果：

2017-09-19 18:15:48.088 iOSSyncDemo[17731:1209181] group task3 finished
2017-09-19 18:15:48.088 iOSSyncDemo[17731:1209183] group task1 finished
2017-09-19 18:15:48.088 iOSSyncDemo[17731:1209180] group task2 finished
2017-09-19 18:15:48.089 iOSSyncDemo[15192:4346855] after wait ..
2017-09-19 18:15:48.089 iOSSyncDemo[17731:1208970] all group task finished

dispatch_once

多用于單例

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
    //單例代碼 
   });

dispatch_after

注意：dispatch_after是延遲提交柄驻，不是延遲運(yùn)行;
作用是：將一個(gè)Block在特定的延時(shí)以后狐树，加入到指定的隊(duì)列中，并執(zhí)行鸿脓；

    dispatch_queue_t queue = dispatch_queue_create("com.investment.concurrent", DISPATCH_QUEUE_CONCURRENT);
    NSLog(@"Begin add operation...");
    dispatch_async(queue, ^{
        [NSThread sleepForTimeInterval:4];
        NSLog(@"operation1 done...");
    });
    
    dispatch_async(queue, ^{
        [NSThread sleepForTimeInterval:4];
        NSLog(@"operation2 done...");
    });
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), queue, ^{
        NSLog(@"after operation");
    });

2017-09-20 09:58:06.633353 iOSSyncDemo[15132:4331075] Begin add operation...
2017-09-20 09:58:08.818947 iOSSyncDemo[15132:4331094] after operation
2017-09-20 09:58:10.639082 iOSSyncDemo[15132:4331095] operation1 done...
2017-09-20 09:58:10.639383 iOSSyncDemo[15132:4331097] operation2 done...

dispatch_suspend

暫停隊(duì)列抑钟，但是這里的“暫脱那”，并不能保證可以立即停止隊(duì)列上正在運(yùn)行的block在塔；dispatch_suspend并不會(huì)立即暫停正在運(yùn)行的block掀抹，而是在當(dāng)前block執(zhí)行完成后，暫停后續(xù)的block執(zhí)行心俗。

    dispatch_queue_t queue = dispatch_queue_create("com.investment.SERIAL", DISPATCH_QUEUE_SERIAL);
    dispatch_async(queue, ^{
        [NSThread sleepForTimeInterval:5];
        NSLog(@"operation 1 executing...");
    });
    dispatch_async(queue, ^{
        [NSThread sleepForTimeInterval:5];
        NSLog(@"operation 2 executing...");
    });
    //延時(shí)一秒
    NSLog(@"sleep 1 second...");
    [NSThread sleepForTimeInterval:1];
    //掛起隊(duì)列
    NSLog(@"suspend...");
    dispatch_suspend(queue);
    //延時(shí)10秒
    NSLog(@"sleep 10 second...");
    [NSThread sleepForTimeInterval:10];
    //恢復(fù)隊(duì)列            
    NSLog(@"resume...");
    dispatch_resume(queue);

2017-09-20 12:02:56.875441 iOSSyncDemo[15232:4356001] sleep 1 second...
2017-09-20 12:02:57.877435 iOSSyncDemo[15232:4356001] suspend...
2017-09-20 12:02:57.877667 iOSSyncDemo[15232:4356001] sleep 10 second...
2017-09-20 12:03:01.880958 iOSSyncDemo[15232:4356027] operation 1 executing...
2017-09-20 12:03:07.878927 iOSSyncDemo[15232:4356001] resume...
2017-09-20 12:03:12.890141 iOSSyncDemo[15232:4356024] operation 2 executing...

dispatch_apply

這個(gè)方法是同步的! 會(huì)阻塞當(dāng)前線程;

 dispatch_queue_t queue = dispatch_queue_create("com.investment.CONCURRENT", DISPATCH_QUEUE_CONCURRENT);
    dispatch_apply(3, queue, ^(size_t i) {
        sleep(1);
        NSLog(@"%@", [NSThread currentThread]);
        NSLog(@"loop: %zu", i);
    });
    NSLog(@"after apply operation...");

2017-09-20 09:51:09.230843 iOSSyncDemo[15125:4329829] <NSThread: 0x17406fac0>{number = 1, name = main}
2017-09-20 09:51:09.231062 iOSSyncDemo[15125:4329829] loop: 0
2017-09-20 09:51:09.233557 iOSSyncDemo[15125:4329856] <NSThread: 0x17007dbc0>{number = 3, name = (null)}
2017-09-20 09:51:09.233747 iOSSyncDemo[15125:4329856] loop: 1
2017-09-20 09:51:10.232754 iOSSyncDemo[15125:4329829] <NSThread: 0x17406fac0>{number = 1, name = main}
2017-09-20 09:51:10.232955 iOSSyncDemo[15125:4329829] loop: 2
2017-09-20 09:51:10.233043 iOSSyncDemo[15125:4329829] after apply operation...

dispatch_semaphore_t

用于線程間同步，比如下面這個(gè)生產(chǎn)者消費(fèi)者模型蓉驹。

    dispatch_semaphore_t sem = dispatch_semaphore_create(0);
    dispatch_queue_t queue = dispatch_queue_create("com.investment.concurrent", DISPATCH_QUEUE_CONCURRENT);
    dispatch_async(queue, ^{
        for (int i = 0; i < 3; i ++) {
            sleep(2);
            NSLog(@"create one product");
            dispatch_semaphore_signal(sem);
        }
    });
    
    dispatch_async(queue, ^{
        for (int i = 0; i < 100; i ++) {
            dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
            NSLog(@"consume one product");
        }
    });

2017-09-20 12:25:19.951850 iOSSyncDemo[15250:4360783] create one product
2017-09-20 12:25:19.952206 iOSSyncDemo[15250:4360780] consume one product
2017-09-20 12:25:21.955972 iOSSyncDemo[15250:4360783] create one product
2017-09-20 12:25:21.956282 iOSSyncDemo[15250:4360780] consume one product
2017-09-20 12:25:23.961401 iOSSyncDemo[15250:4360783] create one product
2017-09-20 12:25:23.961720 iOSSyncDemo[15250:4360780] consume one product

dispatch_set_target_queue

設(shè)置隊(duì)列的優(yōu)先級城榛，將參數(shù)一的隊(duì)列的優(yōu)先級設(shè)置成和參數(shù)二的優(yōu)先級一樣。

dispatch_set_target_queue(queue, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0));

最后編輯于：2017.12.10 14:06:10

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