协程资料

http://www.cnblogs.com/laiy/p/coroutine.html
http://gad.qq.com/article/detail/7162620
https://code.csdn.net/Tencent/libco/tree/master
http://vexhub.com/archives/9.html
http://www.lai18.com/content/2412597.html
http://blog.csdn.net/brainkick/article/details/48676403
http://www.tuicool.com/articles/NJNrAn
http://blog.csdn.net/kobejayandy/article/details/46993021
http://iamzhongyong.iteye.com/blog/1916740?utm_source=tuicool&utm_medium=referral