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Finish HW05 #26

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@daohwang daohwang commented Feb 2, 2022

  1. 利用shared_mutex对 users 和 has_login 进行保护。
  2. 尽量缩短临界区大小。
  3. 为了避免资源耗尽的问题，修改线程池，一开始只启动固定的若干worker线程执行任务，主线程和worker线程通过生产者消费者模型进行交互。同时使用std::thread::hardware_concurrency()获得当前平台能够同时跑的最大线程数。
  4. 通过使用std::chrono::steady_clock::time_point 替换原始的时间点。

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