fast_tcp的源代码加上了自己对它的中文注释，由于关于这方面的资料比较少所以想把自己做的一些东西拿出来，让同样学TCP的网友多点参考-fast_tcp added the source code of its own Chinese notes, as a result of the information in this regard is less so wanted to do something out so that the same TCP users learn more re