并发编程总结

一.ReentrantLock总结

1.一些方法：
ReentrantLock reentrantLock = new ReentrantLock();
1)加锁
reentrantLock.lock();
2)释放锁
reentrantLock.unlock();
3)尝试获取锁 获取不到返回false，获取不到直接放弃，不进入阻塞队列
reentrantLock.tryLock();
4)在给定时间内获取锁，获取不到就退出
reentrantLock.tryLock(2, TimeUnit.SECONDS);
5)锁绑定多个条件：一个 ReentrantLock 可以同时绑定多个 Condition 对象，更细粒度的唤醒线程,
通过reentrantLock.newCondition()创建一个条件变量condition
通过condition.await()方法，当前线程进入condition等待，释放锁；
通过condition.singal()方法，唤醒在condition中的线程;
6)reentrantLock.lockInterruptibly()`：获得可打断的锁

public static void main(String[] args) throws InterruptedException {    
    ReentrantLock lock = new ReentrantLock();    
    Thread t1 = new Thread(() -> {        
        try {            
            System.out.println("尝试获取锁");            
            lock.lockInterruptibly();        
        } catch (InterruptedException e) {            
            System.out.println("没有获取到锁，被打断，直接返回");            
            return;        
        }        
        try {            
            System.out.println("获取到锁");        
        } finally {            
            lock.unlock();        
        }    
    }, "t1");    
    lock.lock();    
    t1.start();    
    Thread.sleep(2000);    
    System.out.println("主线程进行打断锁");    
    t1.interrupt();
}