线程中yield()方法的一个奇怪的问题

本文通过一个简单的Java多线程示例测试了yield方法的效果。在循环中每到达10的倍数时调用一次yield方法,期望能实现线程间的轮流执行。然而,实际运行结果显示该方法并未如预期般工作。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

今天做了个关于yield方法的一个小例子测试,

一个线程循环50次,用变量i标记,并每次输出当前循环到第几次(输出i),

当i为整10的数时调用yield方法(if(0 == i%10))

本以为一个这么小的例子应该不会出什么问题,结果。。。。

下面贴出源代码和4次测试结果

源代码:

public class TestYield {

	public static void main(String[] args) {
		Thread4 t1 = new Thread4("1");
		Thread4 t2 = new Thread4("2");
		t1.start();
		t2.start();
	}
}

class Thread4 extends Thread {
	public Thread4(String name) {
		super(name);
	}
	public void run() {
		for(int i=1; i<=50; i++) {
			System.out.println("thread "+getName()+":"+i);
			if(0 == i%10) {
				yield();
			}
		}
	}
}

结果1:

thread 1:1
thread 1:2
thread 1:3
thread 1:4
thread 1:5
thread 1:6
thread 1:7
thread 1:8
thread 1:9
thread 1:10
thread 2:1
thread 2:2
thread 2:3
thread 2:4
thread 2:5
thread 2:6
thread 2:7
thread 2:8
thread 2:9
thread 2:10
thread 1:11
thread 1:12
thread 2:11
thread 2:12
thread 2:13
thread 2:14
thread 2:15
thread 2:16
thread 2:17
thread 1:13
thread 1:14
thread 1:15
thread 1:16
thread 1:17
thread 1:18
thread 1:19
thread 1:20
thread 2:18
thread 2:19
thread 2:20//这里异常
thread 2:21
thread 2:22
thread 2:23
thread 2:24
thread 2:25
thread 2:26
thread 2:27
thread 2:28
thread 2:29
thread 2:30//这里异常
thread 2:31
thread 2:32
thread 1:21
thread 1:22
thread 1:23
thread 1:24
thread 1:25
thread 1:26
thread 1:27
thread 1:28
thread 1:29
thread 1:30//这里异常
thread 1:31
thread 1:32
thread 1:33
thread 1:34
thread 1:35
thread 1:36
thread 1:37
thread 1:38
thread 1:39
thread 1:40
thread 2:33
thread 2:34
thread 2:35
thread 2:36
thread 2:37
thread 2:38
thread 2:39
thread 2:40
thread 1:41
thread 1:42
thread 1:43
thread 2:41
thread 2:42
thread 2:43
thread 2:44
thread 2:45
thread 2:46
thread 2:47
thread 2:48
thread 2:49
thread 2:50
thread 1:44
thread 1:45
thread 1:46
thread 1:47
thread 1:48
thread 1:49
thread 1:50
结果2:

thread 1:1
thread 1:2
thread 1:3
thread 1:4
thread 2:1
thread 2:2
thread 2:3
thread 2:4
thread 2:5
thread 2:6
thread 2:7
thread 2:8
thread 2:9
thread 2:10
thread 1:5
thread 1:6
thread 1:7
thread 1:8
thread 1:9
thread 1:10
thread 2:11
thread 2:12
thread 2:13
thread 2:14
thread 2:15
thread 2:16
thread 2:17
thread 2:18
thread 2:19
thread 2:20//这里异常
thread 2:21
thread 2:22
thread 2:23
thread 2:24
thread 2:25
thread 2:26
thread 2:27
thread 2:28
thread 2:29
thread 2:30//这里异常
thread 2:31
thread 2:32
thread 2:33
thread 2:34
thread 2:35
thread 2:36
thread 2:37
thread 2:38
thread 2:39
thread 2:40//这里异常
thread 2:41
thread 2:42
thread 2:43
thread 2:44
thread 2:45
thread 2:46
thread 2:47
thread 2:48
thread 2:49
thread 2:50
thread 1:11
thread 1:12
thread 1:13
thread 1:14
thread 1:15
thread 1:16
thread 1:17
thread 1:18
thread 1:19
thread 1:20
thread 1:21
thread 1:22
thread 1:23
thread 1:24
thread 1:25
thread 1:26
thread 1:27
thread 1:28
thread 1:29
thread 1:30
thread 1:31
thread 1:32
thread 1:33
thread 1:34
thread 1:35
thread 1:36
thread 1:37
thread 1:38
thread 1:39
thread 1:40
thread 1:41
thread 1:42
thread 1:43
thread 1:44
thread 1:45
thread 1:46
thread 1:47
thread 1:48
thread 1:49
thread 1:50

结果3:

thread 1:1
thread 1:2
thread 1:3
thread 1:4
thread 1:5
thread 1:6
thread 1:7
thread 1:8
thread 1:9
thread 1:10//这里异常
thread 1:11
thread 1:12
thread 1:13
thread 1:14
thread 1:15
thread 1:16
thread 1:17
thread 1:18
thread 1:19
thread 1:20//这里异常
thread 1:21
thread 1:22
thread 1:23
thread 1:24
thread 1:25
thread 1:26
thread 1:27
thread 1:28
thread 1:29
thread 1:30//这里异常
thread 1:31
thread 2:1
thread 2:2
thread 2:3
thread 2:4
thread 2:5
thread 2:6
thread 2:7
thread 2:8
thread 2:9
thread 2:10
thread 1:32
thread 1:33
thread 1:34
thread 1:35
thread 1:36
thread 1:37
thread 1:38
thread 1:39
thread 1:40
thread 2:11
thread 2:12
thread 2:13
thread 2:14
thread 2:15
thread 2:16
thread 2:17
thread 2:18
thread 2:19
thread 2:20
thread 1:41
thread 1:42
thread 1:43
thread 1:44
thread 1:45
thread 1:46
thread 1:47
thread 1:48
thread 1:49
thread 1:50
thread 2:21
thread 2:22
thread 2:23
thread 2:24
thread 2:25
thread 2:26
thread 2:27
thread 2:28
thread 2:29
thread 2:30
thread 2:31
thread 2:32
thread 2:33
thread 2:34
thread 2:35
thread 2:36
thread 2:37
thread 2:38
thread 2:39
thread 2:40
thread 2:41
thread 2:42
thread 2:43
thread 2:44
thread 2:45
thread 2:46
thread 2:47
thread 2:48
thread 2:49
thread 2:50

结果4:

thread 1:1
thread 1:2
thread 1:3
thread 1:4
thread 1:5
thread 1:6
thread 1:7
thread 2:1
thread 2:2
thread 2:3
thread 2:4
thread 2:5
thread 2:6
thread 2:7
thread 2:8
thread 2:9
thread 2:10
thread 1:8
thread 1:9
thread 1:10
thread 2:11
thread 2:12
thread 2:13
thread 2:14
thread 2:15
thread 2:16
thread 2:17
thread 2:18
thread 2:19
thread 2:20//这里异常
thread 2:21
thread 2:22
thread 2:23
thread 2:24
thread 2:25
thread 2:26
thread 2:27
thread 1:11
thread 2:28
thread 2:29
thread 2:30
thread 1:12
thread 1:13
thread 1:14
thread 1:15
thread 1:16
thread 1:17
thread 1:18
thread 1:19
thread 1:20
thread 2:31
thread 2:32
thread 2:33
thread 2:34
thread 2:35
thread 2:36
thread 2:37
thread 2:38
thread 2:39
thread 2:40//这里异常
thread 2:41
thread 2:42
thread 2:43
thread 2:44
thread 2:45
thread 2:46
thread 2:47
thread 2:48
thread 2:49
thread 2:50
thread 1:21
thread 1:22
thread 1:23
thread 1:24
thread 1:25
thread 1:26
thread 1:27
thread 1:28
thread 1:29
thread 1:30
thread 1:31
thread 1:32
thread 1:33
thread 1:34
thread 1:35
thread 1:36
thread 1:37
thread 1:38
thread 1:39
thread 1:40
thread 1:41
thread 1:42
thread 1:43
thread 1:44
thread 1:45
thread 1:46
thread 1:47
thread 1:48
thread 1:49
thread 1:50

运行4次,每次都有异常

求解?

Unity的yield是一种用于实现协程功能的关键字。它允许在一段代码执行过程中暂停执行,等待一段时间或满足特定条件后继续执行。使用yield可以在游戏中实现各种功能,比如延时操作、动画效果、异步加载资源等。通过使用yield,可以使代码更加简洁、可读性更高,并且避免了使用传统的回调函数或线程的复杂性。在Unity中,yield通常与IEnumerator接口一起使用,IEnumerator接口可以返回一个IEnumerator对象,该对象可以被迭代器用于执行yield语句中定义的操作。IEnumerator和IEnumerable接口的区别较小,在Unity中一般只使用IEnumerator来实现协程功能。协程方法的执行与Update()方法类似,都是在Unity每帧调用的函数中执行。如果一个MonoBehaviour对象处于激活状态并且yield的条件满足,协程方法的后续代码会被执行。需要注意的是,如果在对象的启动阶段调用协程,协程会立即执行到第一个yield return语句处,如果是yield return null,它会在同一帧再次被唤醒。如果没有考虑这个细节,可能会导致一些奇怪问题。总之,Unity的yield是一种强大的工具,可以帮助开发者实现更加灵活和高效的游戏逻辑。<span class="em">1</span><span class="em">2</span><span class="em">3</span> #### 引用[.reference_title] - *1* *2* *3* [简要分析unity3d中 yield](https://blog.csdn.net/sky1466181491/article/details/74638923)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 100%"] [ .reference_list ]
评论 2
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值