目录1、单线程执行2、多线程执行timer最基本理解就是定时器，可以启动多个定时任务，这些定时器任务是异步执行，所以不存在等待顺序执行问题。
There is a line in the 3rd tutorial on Boost asio that shows how to renew a timer and yet prevent there from being drift. The line is the following:
加载中,请稍侯......