synchronized实现原理

Java并发之彻底搞懂偏向锁升级为轻量级锁

http://www.voidcn.com/article/p-hagongck-wk.html

http://www.infoq.com/cn/articles/java-se-16-synchronized/

synchronized和lock的实现原理

http://blog.csdn.net/tingfeng96/article/details/52219649

ReentrantLock实现原理详解

http://www.jb51.net/article/105762.htm