epoll

1.epoll是阻塞还是非阻塞

http://stackoverflow.com/questions/7209057/does-poll-epoll-block-how-is-it-different-from-async-io

2.使用例子

http://www.cnblogs.com/venow/archive/2012/11/30/2790031.html

http://www.cnblogs.com/haippy/archive/2012/01/09/2317269.html