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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。