Fork/exec & wait for "do your thing" notice is the pre-threads co-routine/continuation equivalent. Although, system("program to run") call allows better separat

Fork/exec & wait for "do your thing" notice is the pre-threads co-routine/continuation equivalent. Although, system("program to run") call allows better separation with less coding effort. Don't think concurrency in C would have been included per unix philosopy of program does one thing well. Would have been program to feed data to named pipe, program to read data from named pipe. Closest K&R C related example: Duff's Device & Simon Tatham's coroutines in C using macros. https://www.chiark.greenend.org.uk/~sgtatham/coroutines.html https://www.chiark.greenend.org.uk/~sgtatham/coroutines.html