有限状态机 linux网络编程--Circular Buffer(Ring Buffer) 环形缓冲区的设计与实现
https://www.cnblogs.com/skyfsm/p/7071386.html
https://blog.****.net/yusiguyuan/article/details/18368095
https://www.cnblogs.com/skyfsm/p/7071386.html
https://blog.****.net/yusiguyuan/article/details/18368095