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ReentrantLock 实现原理 | crossoverJie's Blog
source link: https://crossoverjie.top/2018/01/25/ReentrantLock/?
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使用 `synchronize` 来做同步处理时，锁的获取和释放都是隐式的，实现的原理是通过编译后加上不同的机器指令来实现。而 ReentrantLock 就是一个普通的类，它是基于 AQS(AbstractQueuedSynchronizer)来实现的。是一个重入锁：一个线程获得了锁之后仍然可以反复的加锁，不会出现自己阻塞自己的情况。AQS 是 Java 并发包里实现锁、同步的一个重要
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