[ruby-core:105447] [Ruby master Bug#18193] Accessing global configuration from Ractors

Issue #18193 has been updated by Eregon (Benoit Daloze).


#17592 would let this work but it has not been implemented yet, cc @ko1

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Bug #18193: Accessing global configuration from Ractors
https://bugs.ruby-lang.org/issues/18193#change-93896

* Author: kirs (Kir Shatrov)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.2p107
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Consider a very common Ruby code with `attr_accessor` on a class:

``` ruby
class GlobalConfig
  class << self
    attr_accessor :option
  end
end

GlobalConfig.option = 123
GlobalConfig.freeze

puts GlobalConfig.frozen? # => true

r = Ractor.new do
  GlobalConfig.option
end

puts r.take
```


Right now, this fails `can not access instance variables of classes/modules from non-main Ractors`.

Is this considered a bug? If it is, I'd be happy to work on a fix.
To me, it seems like we should allow accessing frozen objects.

If this is expected behavior, then I'd like to open a conversation for how libraries and apps should expose things like global configuration for Ractors to consume.



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