多线程《API》相关_简单了解2

gcd相关API的简单使用

// gcd循环
- (void)applyGCDLoop {
    dispatch_queue_t queue = dispatch_queue_create(NULL, DISPATCH_QUEUE_CONCURRENT);
    dispatch_apply(5, queue, ^(size_t iteration) {
        NSLog(@"_任务_%@",[NSThread currentThread]);
    });
    NSLog(@"_结束_");
}
/*
2022-08-20 18:29:40.561764+0800 YDBasicPublicCourse[39721:2480584] _任务_<NSThread: 0x600003afab80>{number = 8, name = (null)}
2022-08-20 18:29:40.561800+0800 YDBasicPublicCourse[39721:2480582] _任务_<NSThread: 0x600003a8ee40>{number = 4, name = (null)}
2022-08-20 18:29:40.561853+0800 YDBasicPublicCourse[39721:2480581] _任务_<NSThread: 0x600003afa180>{number = 7, name = (null)}
2022-08-20 18:29:40.562020+0800 YDBasicPublicCourse[39721:2480582] _任务_<NSThread: 0x600003a8ee40>{number = 4, name = (null)}
2022-08-20 18:29:40.562420+0800 YDBasicPublicCourse[39721:2480529] _任务_<_NSMainThread: 0x600003ab0840>{number = 1, name = main}
2022-08-20 18:29:40.563278+0800 YDBasicPublicCourse[39721:2480529] _结束_
*/

// gcd循环apply内部再使用异步
- (void)applyGCDLoop {
    dispatch_queue_t queue = dispatch_queue_create(NULL, DISPATCH_QUEUE_CONCURRENT);
    dispatch_apply(5, queue, ^(size_t iteration) {
//        NSLog(@"_任务_%@",[NSThread currentThread]);
        dispatch_async(queue, ^{
            NSLog(@"_任务_%@",[NSThread currentThread]);
        });
    });
    NSLog(@"_结束_");
}
/*
2022-08-20 18:44:53.937721+0800 YDBasicPublicCourse[39932:2493458] _结束_
2022-08-20 18:44:53.937789+0800 YDBasicPublicCourse[39932:2493588] _任务_<NSThread: 0x600000667040>{number = 4, name = (null)}
2022-08-20 18:44:53.937789+0800 YDBasicPublicCourse[39932:2493589] _任务_<NSThread: 0x60000066c280>{number = 7, name = (null)}
2022-08-20 18:44:53.937805+0800 YDBasicPublicCourse[39932:2493591] _任务_<NSThread: 0x600000668300>{number = 6, name = (null)}
2022-08-20 18:44:53.937819+0800 YDBasicPublicCourse[39932:2493587] _任务_<NSThread: 0x600000615f40>{number = 5, name = (null)}
2022-08-20 18:44:53.937969+0800 YDBasicPublicCourse[39932:2493589] _任务_<NSThread: 0x60000066c280>{number = 7, name = (null)}
*/

// group——随机运行
// 多张图片下载后变成一张图片，组内完成通知全部完成。
- (void)group {
    dispatch_group_t group = dispatch_group_create();
    dispatch_group_enter(group);
    dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{
        dispatch_async(dispatch_get_global_queue(0, 0), ^{
            NSLog(@"_任务1_%@",[NSThread currentThread]);
            dispatch_group_leave(group);
        });
    });
    
    dispatch_group_enter(group);
    dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{
        dispatch_async(dispatch_get_global_queue(0, 0), ^{
            NSLog(@"_任务2_%@",[NSThread currentThread]);
            dispatch_group_leave(group);
        });
    });
    
    dispatch_group_enter(group);
    dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{
        dispatch_async(dispatch_get_global_queue(0, 0), ^{
            NSLog(@"_任务3_%@",[NSThread currentThread]);
            dispatch_group_leave(group);
        });
    });
    
    dispatch_group_notify(group, dispatch_get_global_queue(0, 0), ^{
        NSLog(@"_结束_%@",[NSThread currentThread]);
    });
}
/*
随机结果：
2022-08-20 20:04:02.685113+0800 YDBasicPublicCourse[40488:2528500] _任务2_<NSThread: 0x6000037ec580>{number = 4, name = (null)}
2022-08-20 20:04:02.685119+0800 YDBasicPublicCourse[40488:2528494] _任务3_<NSThread: 0x6000037eab40>{number = 7, name = (null)}
2022-08-20 20:04:02.685186+0800 YDBasicPublicCourse[40488:2528495] _任务1_<NSThread: 0x6000037e9900>{number = 5, name = (null)}
2022-08-20 20:04:02.685617+0800 YDBasicPublicCourse[40488:2528494] _结束_<NSThread: 0x6000037eab40>{number = 7, name = (null)}


随机结果2:
2022-08-20 20:05:47.390430+0800 YDBasicPublicCourse[40501:2529997] _任务1_<NSThread: 0x600000a1d500>{number = 5, name = (null)}
2022-08-20 20:05:47.390430+0800 YDBasicPublicCourse[40501:2529994] _任务2_<NSThread: 0x600000a1df40>{number = 4, name = (null)}
2022-08-20 20:05:47.390430+0800 YDBasicPublicCourse[40501:2529993] _任务3_<NSThread: 0x600000a09480>{number = 6, name = (null)}
2022-08-20 20:05:47.390792+0800 YDBasicPublicCourse[40501:2529993] _结束_<NSThread: 0x600000a09480>{number = 6, name = (null)}
*/

// group
- (void)group {
    dispatch_group_t group = dispatch_group_create();
    dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{
        NSLog(@"_任务1_%@",[NSThread currentThread]);
    });
    dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{
        NSLog(@"_任务2_%@",[NSThread currentThread]);
    });
    dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{
        NSLog(@"_任务3_%@",[NSThread currentThread]);
    });
    dispatch_group_notify(group, dispatch_get_global_queue(0, 0), ^{
        NSLog(@"_结束_%@",[NSThread currentThread]);
    });
}
/*
随机结果1:
2022-08-20 20:16:47.488590+0800 YDBasicPublicCourse[40604:2543810] _任务2_<NSThread: 0x600000d7a4c0>{number = 4, name = (null)}
2022-08-20 20:16:47.488590+0800 YDBasicPublicCourse[40604:2543809] _任务1_<NSThread: 0x600000d74c80>{number = 6, name = (null)}
2022-08-20 20:16:47.488590+0800 YDBasicPublicCourse[40604:2543812] _任务3_<NSThread: 0x600000d76580>{number = 7, name = (null)}
2022-08-20 20:16:47.489105+0800 YDBasicPublicCourse[40604:2543809] _结束_<NSThread: 0x600000d74c80>{number = 6, name = (null)}

随机结果2:
2022-08-20 20:17:54.554155+0800 YDBasicPublicCourse[40613:2545547] _任务1_<NSThread: 0x600001d50000>{number = 7, name = (null)}
2022-08-20 20:17:54.554155+0800 YDBasicPublicCourse[40613:2545542] _任务3_<NSThread: 0x600001d4c840>{number = 4, name = (null)}
2022-08-20 20:17:54.554155+0800 YDBasicPublicCourse[40613:2545549] _任务2_<NSThread: 0x600001d49b80>{number = 5, name = (null)}
2022-08-20 20:17:54.554456+0800 YDBasicPublicCourse[40613:2545547] _结束_<NSThread: 0x600001d50000>{number = 7, name = (null)}
*/

多线程优先级简单探索

// 顺序不可控，随机三条线程
- (void)priorityOne {
    dispatch_queue_t q1 = dispatch_queue_create("yd.com.q1", DISPATCH_QUEUE_SERIAL);
    dispatch_queue_t q2 = dispatch_queue_create("yd.com.q2", DISPATCH_QUEUE_SERIAL);
    dispatch_queue_t q3 = dispatch_queue_create("yd.com.q3", DISPATCH_QUEUE_SERIAL);
    
    dispatch_async(q1, ^{
        NSLog(@"_任务1_%@",[NSThread currentThread]);
    });
    
    dispatch_async(q2, ^{
        NSLog(@"_任务2_%@",[NSThread currentThread]);
    });
    
    dispatch_async(q3, ^{
        NSLog(@"_任务3_%@",[NSThread currentThread]);
    });
}
/*
运行结果1：
2022-08-20 20:30:50.081199+0800 YDBasicPublicCourse[40760:2562251] _任务2_<NSThread: 0x600001d03880>{number = 8, name = (null)}
2022-08-20 20:30:50.081463+0800 YDBasicPublicCourse[40760:2562249] _任务1_<NSThread: 0x600001d0d200>{number = 7, name = (null)}
2022-08-20 20:30:50.081667+0800 YDBasicPublicCourse[40760:2562250] _任务3_<NSThread: 0x600001d0c680>{number = 4, name = (null)}

运行结果2：
2022-08-20 20:32:18.688989+0800 YDBasicPublicCourse[40782:2564611] _任务1_<NSThread: 0x600003b86100>{number = 6, name = (null)}
2022-08-20 20:32:18.688989+0800 YDBasicPublicCourse[40782:2564617] _任务2_<NSThread: 0x600003b82640>{number = 5, name = (null)}
2022-08-20 20:32:18.688989+0800 YDBasicPublicCourse[40782:2564613] _任务3_<NSThread: 0x600003b94040>{number = 7, name = (null)}
*/

// 多线程优先级_玩玩就行，无序。
- (void)priorityTwo {
    dispatch_queue_t q1 = dispatch_queue_create("yd.com.q1", DISPATCH_QUEUE_SERIAL);
    dispatch_queue_t q2 = dispatch_queue_create("yd.com.q2", DISPATCH_QUEUE_SERIAL);
    dispatch_queue_t q3 = dispatch_queue_create("yd.com.q3", DISPATCH_QUEUE_SERIAL);
    
//    dispatch_set_target_queue(q1, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0));
//    dispatch_set_target_queue(q2, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0));
    dispatch_set_target_queue(q3, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0));
    
    dispatch_async(q1, ^{
        NSLog(@"_任务1_%@",[NSThread currentThread]);
    });
    
    dispatch_async(q2, ^{
        NSLog(@"_任务2_%@",[NSThread currentThread]);
    });
    
    dispatch_async(q3, ^{
        NSLog(@"_任务3_%@",[NSThread currentThread]);
    });
}
/*
运行结果1：
2022-08-20 20:46:03.886545+0800 YDBasicPublicCourse[40961:2583690] _任务1_<NSThread: 0x60000363f140>{number = 5, name = (null)}
2022-08-20 20:46:03.886545+0800 YDBasicPublicCourse[40961:2583692] _任务3_<NSThread: 0x600003639c40>{number = 6, name = (null)}
2022-08-20 20:46:03.886545+0800 YDBasicPublicCourse[40961:2583686] _任务2_<NSThread: 0x600003639b80>{number = 7, name = (null)}

运行结果2:
2022-08-20 20:47:20.251079+0800 YDBasicPublicCourse[40972:2585637] _任务3_<NSThread: 0x600002146700>{number = 6, name = (null)}
2022-08-20 20:47:20.251079+0800 YDBasicPublicCourse[40972:2585635] _任务1_<NSThread: 0x600002143cc0>{number = 5, name = (null)}
2022-08-20 20:47:20.251079+0800 YDBasicPublicCourse[40972:2585638] _任务2_<NSThread: 0x600002146b00>{number = 3, name = (null)}
*/

代码块

代码块
最后编辑于 ：
©著作权归作者所有,转载或内容合作请联系作者
  • 人面猴
    序言：七十年代末，一起剥皮案震惊了整个滨河市，随后出现的几起案子，更是在滨河造成了极大的恐慌，老刑警刘岩，带你破解...
    沈念sama阅读 203,271评论 5赞 476
  • 死咒
    序言：滨河连续发生了三起死亡事件，死亡现场离奇诡异，居然都是意外死亡，警方通过查阅死者的电脑和手机，发现死者居然都...
    沈念sama阅读 85,275评论 2赞 380
  • 救了他两次的神仙让他今天三更去死
    文/潘晓璐 我一进店门，熙熙楼的掌柜王于贵愁眉苦脸地迎上来，“玉大人，你说我怎么就摊上这事。” “怎么了？”我有些...
    开封第一讲书人阅读 150,151评论 0赞 336
  • 道士缉凶录：失踪的卖姜人
    文/不坏的土叔 我叫张陵，是天一观的道长。 经常有香客问我，道长，这世上最难降的妖魔是什么？ 我笑而不...
    开封第一讲书人阅读 54,550评论 1赞 273
  • 港岛之恋（遗憾婚礼）
    正文 为了忘掉前任，我火速办了婚礼，结果婚礼上，老公的妹妹穿的比我还像新娘。我一直安慰自己，他们只是感情好，可当我...
    茶点故事阅读 63,553评论 5赞 365
  • 恶毒庶女顶嫁案：这布局不是一般人想出来的
    文/花漫 我一把揭开白布。 她就那样静静地躺着，像睡着了一般。 火红的嫁衣衬着肌肤如雪。 梳的纹丝不乱的头发上，一...
    开封第一讲书人阅读 48,559评论 1赞 281
  • 城市分裂传说
    那天，我揣着相机与录音，去河边找鬼。 笑死，一个胖子当着我的面吹牛，可吹牛的内容都是我干的。 我是一名探鬼主播，决...
    沈念sama阅读 37,924评论 3赞 395
  • 双鸳鸯连环套：你想象不到人心有多黑
    文/苍兰香墨 我猛地睁开眼，长吁一口气：“原来是场噩梦啊……” “哼！你这毒妇竟也来了？” 一声冷哼从身侧响起，我...
    开封第一讲书人阅读 36,580评论 0赞 257
  • 万荣杀人案实录
    序言：老挝万荣一对情侣失踪，失踪者是张志新（化名）和其女友刘颖，没想到半个月后，有当地人在树林里发现了一具尸体，经...
    沈念sama阅读 40,826评论 1赞 297
  • 护林员之死
    正文 独居荒郊野岭守林人离奇死亡，尸身上长有42处带血的脓包…… 初始之章·张勋 以下内容为张勋视角 年9月15日...
    茶点故事阅读 35,578评论 2赞 320
  • 白月光启示录
    正文 我和宋清朗相恋三年，在试婚纱的时候发现自己被绿了。 大学时的朋友给我发了我未婚夫和他白月光在一起吃饭的照片。...
    茶点故事阅读 37,661评论 1赞 329
  • 活死人
    序言：一个原本活蹦乱跳的男人离奇死亡，死状恐怖，灵堂内的尸体忽然破棺而出，到底是诈尸还是另有隐情，我是刑警宁泽，带...
    沈念sama阅读 33,363评论 4赞 318
  • 日本核电站爆炸内幕
    正文 年R本政府宣布，位于F岛的核电站，受9级特大地震影响，放射性物质发生泄漏。R本人自食恶果不足惜，却给世界环境...
    茶点故事阅读 38,940评论 3赞 307
  • 男人毒药：我在死后第九天来索命
    文/蒙蒙 一、第九天 我趴在偏房一处隐蔽的房顶上张望。 院中可真热闹，春花似锦、人声如沸。这庄子的主人今日做“春日...
    开封第一讲书人阅读 29,926评论 0赞 19
  • 一桩弑父案，背后竟有这般阴谋
    文/苍兰香墨 我抬头看了看天上的太阳。三九已至，却和暖如春，着一层夹袄步出监牢的瞬间，已是汗流浃背。 一阵脚步声响...
    开封第一讲书人阅读 31,156评论 1赞 259
  • 情欲美人皮
    我被黑心中介骗来泰国打工， 没想到刚下飞机就差点儿被人妖公主榨干…… 1. 我叫王不留，地道东北人。 一个月前我还...
    沈念sama阅读 42,872评论 2赞 349
  • 代替公主和亲
    正文 我出身青楼，却偏偏与公主长得像，于是被迫代替她去往敌国和亲。 传闻我的和亲对象是个残疾皇子，可洞房花烛夜当晚...
    茶点故事阅读 42,391评论 2赞 342