finish hw05 - #20
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作业要求1：把这些函数变成多线程安全的
共享的数据结构
users使用读写锁保护，do_register写入，do_login和do_queryuser读取has_login使用互斥量保护，do_login写入作业要求2：把这个登录计时器改成基于 chrono 的
将
has_login的值类型改为std::chrono::time_point，使用std::chrono::duration_cast将时间段转换成秒数作业要求3：如何让这个线程保持在后台执行不要退出？
使用
std::async创建异步任务，保存返回的future。在全局的ThreadPool析构时等待所有异步任务完成才返回。