如何检测死锁?同步块超时? [英] How to detect deadlock ? Timeout in synchronized block?

问题描述

我正在调试运行多个线程的Java应用程序.在查看日志一段时间后，似乎这些线程之一不再运行.我的猜测是线程正在等待永远不会释放的锁(最后的输出是在调用同步方法之前).

I’m debugging a Java application that runs several threads. After a while of watching the log it seems that one of those threads is not running anymore. My guess is that the thread is waiting for a lock that is never released (the last output is before calling a synchronized method).

我可以配置线程超时吗?一种等待此锁，但如果10秒钟后仍不可用，就不要再等待！"

Can I configure a timeout to the thread; a sort of "wait for this lock but if it not available after 10 seconds don’t wait anymore!"

推荐答案

您可以使用 RentrantLock 没有合理的顺序与内在锁相同的基本行为和语义.有一种方法 tryLock 需要一个超时参数:

You can use a java.util.concurrent.Lock instead of the intrinsic Object locks. RentrantLock without fair ordering has the same basic behaviour and semantics as an intrinsic lock. There is a method tryLock that takes a timeout parameter:

Lock lock = ...;
if (lock.tryLock(10L, TimeUnit.SECONDS)) {
    try {
        // manipulate protected state
    } finally {
        lock.unlock();
    }
} else {
      // perform alternative actions
}

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