自定义Lock实现

package com.wyt.lock.test;

import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.LockSupport;

public class MyLock implements Lock {
    //锁的持有者
    private final static AtomicReference<Thread> owner = new AtomicReference<>();
    //等待队列
    private LinkedBlockingQueue<Thread> queue = new LinkedBlockingQueue<>();

    @Override
    public void lock() {
        //如果cas失败，则将当前线程添加至阻塞队列
        while (!owner.compareAndSet(null, Thread.currentThread())) {
            queue.add(Thread.currentThread());
            LockSupport.park();//阻塞当前线程
            // 如果当前线程处于非阻塞状态时，可执行下面一行，
            // 执行下面一行的目的是为了防止oom
            queue.remove(Thread.currentThread());
        }
    }

    @Override
    public void unlock() {
        //如果cas成功，遍历阻塞队列，唤醒所有的线程
        if (owner.compareAndSet(Thread.currentThread(), null)) {
            for (Thread thread : queue) {
                LockSupport.unpark(thread);
            }
        }
    }

    @Override
    public void lockInterruptibly() throws InterruptedException {

    }

    @Override
    public boolean tryLock() {
        return false;
    }

    @Override
    public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
        return false;
    }

    @Override
    public Condition newCondition() {
        return null;
    }
}

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