Yeah, you can always write async code by hand. It's a pain because you have to manually yield (as in, save your context, return to the main loop, and poll for t

Yeah, you can always write async code by hand. It's a pain because you have to manually yield (as in, save your context, return to the main loop, and poll for the event to complete yourself) every time you wait for IO or a timer. For simple enough systems it's managable, in larger ones it quickly becomes a pain.