How/Where do event.listen callbacks get called back?

[MrabEzreb 0]

I am currently working on an operating system (mostly to prove to myself that I can) but have come up against a wall of knowledge.

How and where do event handlers registered with event.listen get called?

It doesn't seem like it should be the main loop of the OS (or how would you do anything else), but where should it go?

 

EDIT:

Asking about how OpenOS does it

[dgelessus 26]

In event.lua, computer.pullSignal is replaced with a wrapper that calls dispatch before returning the signal that happened. dispatch then goes through the handlers table and calls all listeners for the event that happened.