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java | 活跃性

 1 year ago
source link: https://benpaodewoniu.github.io/2022/12/19/java128/
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java | 活跃性

2022-12-19java ， 进阶 ， 多线程 ， 基础

1

线程的活跃性有 3 种情况

一个线程需要同时获得多把锁，这样就容易发生死锁了。

  • t1 线程获得 A 对象的锁，接下来想获取 B 对象的锁
  • t2 线程获得 B 对象的锁，接下来想获取 A 对象的锁
package com.redisc;

import lombok.extern.slf4j.Slf4j;

@Slf4j(topic = "c.Run")
public class Run {

static volatile int count = 10;

public static void main(String[] args) throws Exception {
        new Thread(() -> {
            while (count > 0) {
                try {
                    Thread.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                count--;
                log.debug("count {}", count);
            }
        }).start();

new Thread(() -> {
            while (count < 20) {
                try {
                    Thread.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                count++;
                log.debug("count {}", count);
            }
        }).start();
    }

}

两个线程争相创造条件。

其中一个线程一直处于非运行状态。


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