基础 | 并发编程 - [死锁]

@

目录

制造一个死锁

public class DeadlockDemo {
    public static void work(String lock1,String lock2){
        synchronized (lock1){
            System.out.println(Thread.currentThread().getName()+" has "+ lock1 + " wait for " + lock2);
            try { TimeUnit.SECONDS.sleep(3); } catch (InterruptedException e) { e.printStackTrace(); }
            synchronized (lock2){
                System.out.println(" had "+ lock2);
            }
        }
    }

    public static void main(String[] args) {
        new Thread(()->{
            work("1","2");
        },"AAA").start();
        new Thread(()->{
            work("2","1");
        },"BBB").start();
    }
}

现象

排查
获取有问题的 java 进程的编号 jps -l

查看进程的栈信息 jstack 7976

也可以使用 jconsole 的排查死锁功能
idea 工具配置
需要配置环境变量和 path