I think it's mainly a fiber library, actually. The TCP and channel functions yield and resume automatically based on when the underlying operation blocks. They

I think it's mainly a fiber library, actually. The TCP and channel functions yield and resume automatically based on when the underlying operation blocks. They have yield(), but I don't see the opposite, the ability to explicitly resume a stopped context. Edit: for a "pure" coroutine library, I'd recommend libco from BSNES. It only has 4 functions: active, create, switch and delete. I wrote a fiber library using libco plus libuv, which was fairly easy. https://web.archive.org/web/20140209005854/http://byuu.org/programming/libco/ https://web.archive.org/web/20140209005854/http://byuu.org/p... (unfortunately he still hasn't rebuilt his site)