hw05 done #38
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hw05 done #38
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定义两个shared_mutex，分别管理users和has_login，利用lock_guard思想，读数据时，shared_lock；写数据时，unique_lock
面对线程过多的问题，作业完成后，阅读了#4 的作业，学习了这种线程池的实现方式。
但是有些疑问，当ThreadPool调用解构函数时，stop参数变为true，线程跳出循环，好像没有保证能将MTQueue中保存的任务全部执行完成