lock和lockInterruptibly

lockInterruptibly()允许在等待时由其他线程的Thread.interrupt()方法来中断等待线程而直接返回，这时是不用获取锁的，而会抛出一个InterruptException。而ReentrantLock.lock()方法则不允许Thread.interrupt()中断，即使检测到了Thread.interruptted一样会继续尝试获取锁，失败则继续休眠。只是在最后获取锁成功之后在把当前线程置为interrupted状态。

 

public class TestLock {

	public static void main(String[] args) {
		Thread t1 = new Thread(new RunIt());
		Thread t2 = new Thread(new RunIt());
		
		t1.start();
		t2.start();
		t2.interrupt();
		
	}
}

class RunIt implements Runnable{

	private static Lock lock = new ReentrantLock();
	@Override
	public void run() {
		try {
			runJob();
		} catch (InterruptedException e) {
			System.out.println(Thread.currentThread().getName()+" Interrrupted from runJob.");
		}
	}
	
	private void runJob() throws InterruptedException{
		lock.lockInterruptibly();
		System.out.println(Thread.currentThread().getName()+" 到此一游....");
		try{
			System.out.println(Thread.currentThread().getName() + " running");
			TimeUnit.SECONDS.sleep(3);
			System.out.println(Thread.currentThread().getName() + " finished");
			
		}catch(InterruptedException e){
			System.out.println(Thread.currentThread().getName() + " interrupted");
		}finally{
			lock.unlock();
		}
	}
}

 

不管使用lock()还是lockinterruptibly都需要注意不要将该方法置于try块中！