在Intellij Idea中的线程之间切换 [英] switching between threads in Intellij Idea

问题描述

如何在已暂停程序的线程之间切换？

How to switch between threads of a suspended program?

或任何使用Intellij Idea描述多线程调试的基本功能的教程-暂停，恢复，在线程之间切换。

or Any tutorial on multi-threaded debugging with Intellij Idea describing basic features - suspend, resume, switch between threads.

非常好的NetBeans教程/分步指南：
例如 https://netbeans.org/kb/docs/java/debug-multithreaded.html

very good tutorials/step-by-step guide available for Netbeans: e.g. https://netbeans.org/kb/docs/java/debug-multithreaded.html

推荐答案

技巧是将断点挂起策略设置为-线程。
查看断点属性（右键单击断点）

Trick is to set breakpoint suspend policy to - Thread. View breakpoint properties (right-click on breakpoint)

一旦完成的线程将达到断点并阻塞，现在可以将活动线程切换为检查竞争条件/死锁。

Once done threads will hit breakpoint and block, now active thread can be switched to check race conditions/deadlocks.

以下用于创建死锁的代码段：

Following code snippet for creating deadlock:

public static void main(String args[]) {
    Thread thread1 = new Thread(null, new MyThread(obj1, obj2), "Thread-1");
    Thread thread2 = new Thread(null, new MyThread(obj2, obj1), "Thread-2");
    thread1.start();
    thread2.start();
}
class MyThread implements Runnable {
    private Object obj1;
    private Object obj2;

    MyThread(Object obj1, Object obj2) {
        this.obj1 = obj1;
        this.obj2 = obj2;
    }

    @Override
    public void run() {
        System.out.println("Acquiring locks");
        synchronized (obj1){
            System.out.println("Acquired 1st lock");
            synchronized (obj2){
                System.out.println("Acquired 2nd lock");
            }
            System.out.println("Released 2nd lock");
        }
        System.out.println("Released 1st lock");
    }
}

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