[ruby-core:101712] [Ruby master Bug#17470] Introduce non-blocking `Timeout.timeout`

Issue #17470 has been updated by Eregon (Benoit Daloze).


How would that work, what would be a sample implementation of the hook?
`Timeout.timeout` must be able to interrupt non-IO operations as well.

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Bug #17470: Introduce non-blocking `Timeout.timeout`
https://bugs.ruby-lang.org/issues/17470#change-89535

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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In this bug report, user complained that `Timeout.timeout` does not work correctly with scheduler: https://github.com/socketry/async-io/issues/43

We should introduce non-blocking timeout.

I propose the following:

```
rb_fiber_scheduler_with_timeout(VALUE scheduler, VALUE timeout, VALUE block)
```

We can directly modify `Timeout.timeout` to invoke this hook.



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