jdk util concurrent 源码阅读（一）

对于object隐式锁和lock(condition)两种方式，下面问题：
1. entry set 抢锁机制
2. wait set 唤醒机制（随机？）
3. wait set 唤醒之后没有抢到锁直接放入entry set?还是继续留存wait set?
4. reentrantlock lock readwritelock 经典场景

To a great extent, the manner in which a Java Virtual Machine implementation selects the next thread from the wait or entry sets is a decision of individual implementation designers. For example, implementation designers can decide how to select:
* thread from the wait set given a notify command
* the order to resurrect threads from the wait set given a notify all command
* the order to allow threads from the entry set to acquire the monitor
* how to choose between threads suspended in the wait set versus the entry set after a notify command

阅读资料：
1. inside jvm
2. java concurrecy in practice
3. java 多线程
待补

http://robbinfan.com/blog/38/orm-cache-sumup