Java中的死锁检测 [英] Deadlock detection in Java

问题描述

很久以前，我从Java参考书中保存了一句话：Java没有处理死锁的机制。它甚至不知道发生了死锁。 （Head First Java 2nd Edition，p.516）

Long time ago, I saved a sentence from a Java reference book: "Java has no mechanism to handle deadlock. it won't even know deadlock occurred." (Head First Java 2nd Edition, p.516)

那么，它是什么呢？有没有办法在Java中捕获死锁案例？我的意思是，有没有一种方法可以让我们的代码理解发生死锁的情况？

So, what is about it? Is there a way to catch deadlock case in Java? I mean, is there a way that our code understands a deadlock case occurred?

推荐答案

从JDK 1.5开始，有非常有用的方法 java.lang.management 包，用于查找和检查发生的死锁。查看 ThreadMXBean的 findMonitorDeadlockedThreads（）和 findDeadlockedThreads（）方法 class。

Since JDK 1.5 there are very useful methods in the java.lang.management package to find and inspect deadlocks that occurs. See the findMonitorDeadlockedThreads() and findDeadlockedThreads() method of the ThreadMXBean class.

使用它的一种可能方法是使用单独的监视程序线程（或定期任务）来执行此操作。

A possible way to use this is to have a separate watchdog thread (or periodic task) that does this.

示例代码：

  ThreadMXBean tmx = ManagementFactory.getThreadMXBean();
  long[] ids = tmx.findDeadlockedThreads();
  if (ids != null) {
     ThreadInfo[] infos = tmx.getThreadInfo(ids, true, true);
     System.out.println("The following threads are deadlocked:");
     for (ThreadInfo ti : infos) {
        System.out.println(ti);
     }
  }

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