lockInterruptibly与lock

package lock;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class TestLock {

    public static void main(String[] args) {
        Thread t1 = new Thread(new RunTt3());
        Thread t2 = new Thread(new RunTt3());

        t1.start();
        t2.start();
        t2.interrupt();
    }
}

class RunTt3 implements Runnable {

    private static final Lock lock = new ReentrantLock();

    @Override
    public void run() {
        try {
            lock.lock();
            System.out.println(Thread.currentThread().getName() + " running");
            TimeUnit.SECONDS.sleep(5);
            System.out.println(Thread.currentThread().getName() + " finished");
        } catch (InterruptedException e) {
            System.out.println(Thread.currentThread().getName() + " interrupted");
        } finally {
            lock.unlock();
        }
    }
}

运行结果：

Thread-0 running
Thread-0 finished
Thread-1 running
Thread-1 interrupted

说明：使用 lock() 时，t2 调用 interrupt() 需要首先获得锁，才能进行中断

package lock;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class TestLock {

    public static void main(String[] args) {
        Thread t1 = new Thread(new RunTt3());
        Thread t2 = new Thread(new RunTt3());

        t1.start();
        t2.start();
        t2.interrupt();
    }
}

class RunTt3 implements Runnable {

    private static final Lock lock = new ReentrantLock();

    @Override
    public void run() {
        try {
            lock.lockInterruptibly();
            System.out.println(Thread.currentThread().getName() + " running");
            TimeUnit.SECONDS.sleep(5);
            System.out.println(Thread.currentThread().getName() + " finished");
        } catch (InterruptedException e) {
            System.out.println(Thread.currentThread().getName() + " interrupted");
        } finally {
            lock.unlock();
        }
    }
}

运行结果：

Thread-0 running
Thread-1 interrupted
Exception in thread "Thread-1" java.lang.IllegalMonitorStateException
    at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:151)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1261)
    at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:457)
    at lock.RunTt3.run(TestLock.java:33)
    at java.lang.Thread.run(Thread.java:748)
Thread-0 finished

说明：当换成 lockInterruptibly() 时，t2可以在没获取到锁的情况下直接中断