不同线程中的并发(ReentrantLock)

问题描述

我需要在不同的线程中使用ReentrantLock.有可能吗?P.S.在secondMethod中，"lock.unlock()"抛出IllegalMonitorStateException.

I need to use ReentrantLock in different threads. Does it possible?P.S. In secondMethod "lock.unlock()" throw IllegalMonitorStateException.

public class SomeClass {
    private static ConcurrentHashMap<String, String> hashMap = new ConcurrentHashMap<>();
    private final Lock lock = new ReentrantLock();

    public void firstMethod(Action action) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                //SOME CODE BEFORE LOCK
                lock.lock();
                //SOME CODE AFTER UNLOCK
            }
        }).start();
    }

    public void secondMethod(Action action) {
        if (hashMap.get("key").length() == 3)
            lock.unlock();
    }
}

使用java.util.concurrent.locks.Condition解决！

Solved with java.util.concurrent.locks.Condition!

推荐答案

由于所有锁结构均应由不同的线程调用，因此肯定有可能.

It's surely possible because all lock structure are meant to be called by different threads.

您在第二个线程中出错，因为您的方法未在释放之前通过调用lock.lock()来锁定Lock对象；因此，您的线程在解锁之前并不拥有该锁，这是不允许的.

You got error in second threads because your method didn't lock the Lock object by calling lock.lock() before releasing; thus your thread doesn't own the lock before unlocking it, which is not allowed.

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