Issue #17414 has been updated by jhawthorn (John Hawthorn). Status changed from Assigned to Closed I think we can close this as accessing the class instance variables has been allowed for a while (Ruby 3.1?) ``` ruby module Config class << self attr_accessor :conf end self.conf = 42 end Ractor.new { Config.conf = 66 }.take # => can not set instance variables of classes/modules by non-main Ractors (Ractor::IsolationError) Ractor.new { puts Config.conf }.take # => 42 ``` ---------------------------------------- Feature #17414: Ractor should allow access to shareable attributes for Modules/Classes https://bugs.ruby-lang.org/issues/17414#change-112475 * Author: marcandre (Marc-Andre Lafortune) * Status: Closed * Assignee: ko1 (Koichi Sasada) ---------------------------------------- Current situation is *very* limiting. Use-case: global config. Example: [yaml has a global config](https://github.com/ruby/psych/blob/master/lib/psych.rb#L637-L640) and it's not clear to me how to make that Ractor-aware (nicely). It is possible to have the same effect but in ugly ways: ```ruby # Using instance variables of Module not allowed: module Config class << self attr_accessor :conf end self.conf = 42 end Ractor.new { Config.conf = 66 }.take # => can not access instance variables from non-main Ractors Ractor.new { puts Config.conf }.take # => can not access instance variables from non-main Ractors # Same functionality using constants allowed: module Config class << self def conf CONF end def conf=(new_conf) remove_const(:CONF) const_set(:CONF, new_conf) end end CONF = 42 end Ractor.new { Config.conf = 66 }.take # => ok Ractor.new { puts Config.conf }.take # => 66 # Same functionality using methods allowed: module Config class << self def conf 42 end def conf=(new_conf) singleton_class.undef_method(:conf) define_singleton_method(:conf, &Ractor.make_shareable(Proc.new { new_conf })) end end end Ractor.new { Config.conf = 66 }.take # => ok Ractor.new { puts Config.conf }.take # => 66 ``` The priority would be to allow reading these instance variables if they are shareable. Ideally writing would also be allowed, but limiting that to main ractor is less probablematic than with reading. -- https://bugs.ruby-lang.org/