[throwaway81523]

Also look at Protothreads :)

[lixiasky]

Oh absolutely! Adam Dunkels' work is legendary. It's kind of poetic that Protothreads achieved stackless concurrency via C preprocessor macros and Duff's device tricks, and now years later, C++20 finally baked that exact same "state machine via switch-case" logic directly into the compiler. Same spirit, just less macro magic! :)

[srean]

Simon Tatham and Tom Duff too.

https://www.chiark.greenend.org.uk/~sgtatham/coroutines.html