Go-Flavored Concurrency in C (antonz.org)

Just a small "ackchyually": Go is basically a modern Limbo which is itself based on Alef and there was an official "Alef for C" thing in Plan 9 in libthread (https://9p.io/magic/man2html/2/thread)

EDIT: looks like it was ported on UNIX as part of Plan9Port (https://github.com/9fans/plan9port/blob/master/src/libthread...)

But select statements are the most important part, and second to that is the fact that goroutines are low cost user space threads

I was expecting proper green threads (it's not like it's impossible in C, there's several C libraries for doing it).

There is also libmill/libdill, which implements go-style coroutines using setjmp and is usable directly from C (not just as a transpilation target).

https://libmill.org/