[ruby-core:122689] [Ruby Bug#21505] [Ractor] calling exit from non-main ractor will hang if main ractor waits on it

Issue #21505 has been updated by Eregon (Benoit Daloze).


`Kernel#exit` is basically just `raise SystemExit`, does it mean any exception in a Ractor hangs?
IOW, I don't think it should be disallow because `exit` is just an Exception.

----------------------------------------
Bug #21505: [Ractor] calling exit from non-main ractor will hang if main ractor waits on it
https://bugs.ruby-lang.org/issues/21505#change-113967

* Author: luke-gru (Luke Gruber)
* Status: Open
* Assignee: ractor
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
```ruby
r = Ractor.new do
  exit
end

r.join # hangs
```

Should `exit` be allowed in ractors? It would be easiest to disallow, as the code might be tricky if we allow it.



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