Linux下select,poll,epoll等IO模型

参考

http://www.cnblogs.com/Anker/archive/2013/08/14/3258674.html

http://www.cnblogs.com/Anker/p/3261006.html

http://www.cnblogs.com/Anker/p/3263780.html

http://www.cnblogs.com/Anker/p/3265058.html