alt Hacker NewsNo. 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.
Embassy is a single threaded RTOS. Moss implements support for Linux ABI which presumes the existence of threads. The fact that async/await doesn’t itself imply anything about threads doesn’t negate that using it within the context of a kernel implementation of the Linux kernel ABI does require thread suspension by definition - the CPU needs to stop running the current thread (or process) and start executing the next thread if there’s any blocking that’s required. Clue: there’s a scheduler within the implementation which means there’s more than 1 thread on the system.
You’re arguing about the technical definition of async/await while completely ignoring what it means to write a kernel.