CPS

http://www.yinwang.org/blog-cn/2014/04/18/golang/

https://en.wikipedia.org/wiki/Continuation

https://en.wikipedia.org/wiki/Continuation

https://en.wikipedia.org/wiki/Continuation-passing_style

http://stackoverflow.com/questions/14019341/whats-the-difference-between-a-continuation-and-a-callback

https://cnodejs.org/topic/4f16442ccae1f4aa2700107b

http://www.ibm.com/developerworks/cn/linux/l-advflow.html

http://www.nowamagic.net/academy/detail/1220525

http://afoo.me/posts/2011-11-28-Scala_continuations_revisited.html