[ruby-core:103936] [Ruby master Feature#17849] Fix Timeout.timeout so that it can be used in threaded Web servers

Issue #17849 has been updated by matz (Yukihiro Matsumoto).


I doubt if there's a clear solution.

* `Timeout` uses asynchronous exceptions and it **is** difficult to handle correctly.
* for example, if some calls `Timeout.timeout` from within `ensure` clause directly/indirectly
* or what if timeout interrupt breaks in finalizers

The perfect global timeout (that relies on asynchronous exceptions) might be theoretically possible, but practically (nearly) impossible, I believe.

Matz.

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Feature #17849: Fix Timeout.timeout so that it can be used in threaded Web servers
https://bugs.ruby-lang.org/issues/17849#change-92066

* Author: duerst (Martin Dst)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
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Making this a separate issue from #17837

Eregon (Benoit Daloze) wrote in https://bugs.ruby-lang.org/issues/17837#note-10 (which is  about timeouts for regular expressions):

> I think fixing Timeout.timeout might be possible.
> The main/major issue is it can trigger within `ensure`, right? Is there anything else?
> We could automatically mask `Thread#raise` within `ensure` so it only happens after the `ensure` body completes.
> And we could still have a larger "hard timeout" if an `ensure` takes way too long (shouldn't happen, but one cannot be sure).
> I recall discussing this with @schneems some time ago on Twitter.





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