No. I am adding new information but I think you are stuck on your initial idea.

There's no work stealing. Async-await is cooperative multitasking. There is no suspending or resuming a calling thread. There is no saving register state. There is not even a thread.

I will re-reiterate: async-await is just a state machine and Futures are just async values you can poll.

I'm sure moss has an actual preemptive scheduler for processes, but it's completely unrelated to its internal usage of async-await.

See embassy in sibling comments.