Trying to make my own parallel api with more control, but failing miserably

[Elphyn]

This feels way over my head, but I am trying nonetheless
This is the protoype, and it worked really well here:
I was testing it like this
It was awesome when it started working, better then I thought it would, the next day I tried to make it nested, and so far it's just stalls for some reason, I really don't understand what is going on wrong, but the issue is after one item got crafted, callback is called, then it's stalling, after very long time it starts working again, forgetting about all stations besides the one that finished first and it's same thing all over:
new dispatcher
and it's parent coroutine that spawns it:
main

I tried adding error checking like in parallel api, to maybe fish for errors, but it's likely something just isn't yielding, perhaps when it's starts to get nested I am grabbing for events wrong, I really am not sure

[Elphyn]

Narrowed it down to this:
Working version:
old
And trying to make this one work
new

[Elphyn]

Oh, it seems that this was the issue:
threader:run() sleep(0.1)

Removing sleep fixed the issue, but I wanna know why it did break it, and I thought I'd need it to "yeild" to parent coroutine

[Elphyn]

So initially I needed this "sleep" after threader:run, to yeild, so the function that handles q and it's orders would occasionally switch to listener function that receives rednet messages
one example of failed attempt
putting sleep anywhere around threader:run would make the program stall, and not doing so would not allow me to run function alongside listener, what should I do?

[Lupus590]

sleep works by queueing and pulling events
you want to pull an event and then feed that all to your child coroutines
i would look at how paralell handles events
pulling events yields