JMM

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。

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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（Java Memory Model）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。

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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（Java Memory Model，JMM）危害。

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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。

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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。

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Study on JMM and DCL Invalidation

JMM与DCL失效探究

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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。）

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