jmm

The locks are created when the map is created ( there would be JMM problems if they were not . )

锁在创建map的时候被创建（如果不在此时创建锁，将会出现JMM问题。）

In the absence of synchronization , it is allowable ( according to the JMM ) for two threads to see different values in the same memory location .

在缺少同步的情况下，JMM会允许两个线程在同一个内存地址上看到不同的值。

Study on JMM and DCL Invalidation

JMM与DCL失效探究

When a thread exits a synchronized block as part of releasing the associated monitor , the JMM requires that the local processor cache be flushed to main memory .

当线程为释放相关监视器而退出一个同步块时，JMM要求本地处理器缓冲刷新到主存中。

We can extend the lock granularity technique to handle this situation , although we must be careful as there are some potential Java Memory Model ( JMM ) hazards associated with this approach .

我们可以扩展锁粒度技术以应付这种情形，尽管我们必须很小心，因为有与这种方法有关的一些Java内存模型（JavaMemoryModel，JMM）危害。

In the same time , Java Memory Model ( JMM ) allows compilers to change the executing order of programs in the optimization progress . This will lead to lots of unexpected errors in multithreaded Java programs .

同时，Java内存模型JMM（JavaMemoryModel）允许编译器在优化过程中改变程序的执行顺序，这会让多线程Java程序产生许多意想不到的错误。

Based on the deficiency , this paper analyses Java Memory Model ( JMM ), the reason for DCL invalidation and the interior mechanism of " ThreadLocal " . The strategy to design the object of class by singleton model is proposed .

针对这些不足，本文结合实例分析了Java内存模型（JMM）、DCL失效原因以及ThreadLocal的内部运行机制，给出了将类的对象设计成Singleton模式的策略。