ucontext的介绍

http://blog.csdn.net/qq910894904/article/details/41911175

协程的介绍

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

风云的c库

http://blog.codingnow.com/2012/07/c_coroutine.html

https://github.com/cloudwu/coroutine/

腾讯的开源c++库

https://code.csdn.net/Tencent/libco/tree/master

ucontext-人人都可以实现的简单协程库