[issue40800] asyncio.sleep(0) should "yield" back to the event loop, but it doesn't behave as expected

[Bar Harel]

Bar Harel <bzvi7919 at gmail.com> added the comment:

It relinquishes control for exactly one event loop cycle.

You'll see that it takes two or three cycles and then gets cancelled correctly.

The reason being is that recovery from your `await asyncio.sleep(1)` takes two or three cycles. (Under the hood, a few `asyncio.call_soon()` are called in a chain and only 1 is executed each cycle).

This is not a bug, but rather intended behavior. You should probably use `asyncio.to_thread()` or preferably run cpu-intensive code on a different process.

@triage Please close as not-a-bug.

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nosy: +bar.harel

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<https://bugs.python.org/issue40800>
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