I also suggest libtask from Russ Cox http://swtch.com/libtask/
https://github.com/jamwt/libtask
Mongrel2 is also an excellent example of how libtask can be used.
On another note, alts and chans are underrated in libtask -- I wish the documentation promoted them more. To get an idea of what alts look like when used with a few chans, take a look at keyboardthread() from acme:
http://plan9.bell-labs.com/sources/plan9/sys/src/cmd/acme/ac...
It's just... beautiful.
In 1980, barely two years after Hoare's paper, Gerard Holzmann and Rob Pike created a protocol analyzer called pan that takes a CSP dialect as input. [...] Holzmann reports that “Pan found its first error in a Bell Labs data-switch control protocol on 21 November 1980.” That dialect may well have been the first CSP language at Bell Labs, and it certainly provided Pike with experience using and implementing a CSP-like language, his first of many. [...] Holzmann's protocol analyzer developed into the Spin model checker and its Promela language.
How cool. Gerard (http://gerard.holzmann.usesthis.com) is now using Spin and several other verification tools to improve source code quality for space missions at JPL. I did not know about this connection of his work to CSP and, indirectly, to Go.