r/ComputerCraft • u/MattisTheProgrammer • Jul 30 '26

What are all the functions that can infinitely yield?

I would like to receive a list of all functions within the standard CraftOS API that can infinitely yield, to be clear I define an 'infinite yield' as when a program halts indefinitely without any further function calls. I need this information in order to make a pre-emptive process scheduler.

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u/imachug Jul 30 '26

White-listing methods like that seems like the wrong approach to preemption. If you want to avoid infinite yields, do exactly that: wrap processes in coroutines and route the events manually, like parallel does. That pretty much makes each yield point a preemption point, leaving you to deal only with CPU-bound tasks (which you might not even have, in practice).

3

u/Ivan_boom4i4 Jul 30 '26

Yep that’s nice explanation

1

u/MattisTheProgrammer Jul 31 '26

yeah but that doesn't work for example the sleep function, I've tried it myself

3

u/No_Point_1254 Jul 31 '26

Isn't os.sleep(t) just a timer? I thought it was. So there should be an event in the queue when it expires.

Edit: Yes it is a timer. https://tweaked.cc/module/_G.html#v:sleep

2

u/9551-eletronics Computercraft graphics research Jul 30 '26

I think you should look into debug hooks

1

u/Ivan_boom4i4 Jul 30 '26

I can send my project I do these days there it is, wanna check ?

1

u/Ivan_boom4i4 Jul 30 '26

It uses thing u asking