Prior art:

http://man.postnix.pw/plan_9/2/thread (Plan 9's thread(2). Personal note: I absolutely LOVE working with this library)

https://swtch.com/libtask/ (Rus Cox's portable library (Someone on the 9fans mailing list ported it to a micro-controller))

See Also:

https://seh.dev/go-legacy/ (A nice code tour of the historical CSP lineage of Go)

https://swtch.com/~rsc/thread/ (Bell Labs and CSP Threads)