https://github.com/micropython/micropython/blob/62849b7010abffb7b0a9c9875930efe7cb77519c/py/modthread.c#L69

Background:

I'm looking for a way to implement a cancelable timeout on Linux, e.g something like threading.Timer from the standard library.

Being on Linux, I'm thinking of trying a timerfd with uasyncio instead. But if implementing the timeout parameter here is not too hard, I could give it a try. It looks to be platform dependent though, so it might be beyond my capabilities.