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双重锁 #4

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@WOYAOFEI-1

楼主您好,首先感谢您的代码,不过我有一些问题,在getSharedInstance中使用双重锁的目的是什么呢,尤其是Locks class T那个锁有什么必要性吗,这使我感觉有些困惑。还有就是s_singleTonMutex在什么情况会有线程安全问题呢。

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