package jdk_concurrent;

import java.util.concurrent.locks.ReentrantLock;

public class TryLock implements Runnable {
	public static ReentrantLock lock1 = new ReentrantLock();
	public static ReentrantLock lock2 = new ReentrantLock();
	int lock;// 控制加锁顺序,方便构造死锁

	public TryLock(int lock) {
		this.lock = lock;
	}

	public static void main(String[] args) throws InterruptedException {
		TryLock r1 = new TryLock(1);
		TryLock r2 = new TryLock(2);
		Thread t1 = new Thread(r1);
		Thread t2 = new Thread(r2);
		t1.start();
		t2.start();
	}

	@Override
	public void run() {
			if(lock==1){
				while(true){
						if (lock1.tryLock()) {
						try {
							try {
								Thread.sleep(500);
							} catch (InterruptedException e) {
								e.printStackTrace();
							}
							if (lock2.tryLock()) {
								try {
									System.out.println(Thread.currentThread().getId() + ": My jod done.");
									return;
								} finally {
									lock2.unlock();
								}
							}
						} finally {
							lock1.unlock();
						}
					} 
				}
			}else{
				while(true){
						if (lock2.tryLock()) {
						try {
							try {
								Thread.sleep(500);
							} catch (InterruptedException e) {
								e.printStackTrace();
							}
							if (lock1.tryLock()) {
								try {
									System.out.println(Thread.currentThread().getId() + ": My jod done.");
									return;
								} finally {
									lock1.unlock();
								}
							}
						} finally {
							lock2.unlock();
						}
					} 
				}
			}
		}
	}