Bug #17513: Methods of shareable objects and UnboundMethods should be shareable

• Status: Open
• Priority: Normal
• Assignee: ko1 (Koichi Sasada)
• Target version: -
• ruby -v: 3.0.0p0
• Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN

[marcandre (Marc-Andre Lafortune)]

class Foo
  def foo
  end
end

f = Foo.new.freeze
Ractor.shareable?(f) # => true
Ractor.make_shareable(f.method(:foo).to_proc) # => Proc, ok
Ractor.make_shareable(f.method(:foo)) # => Ractor::Error, expected Method
Ractor.make_shareable(Foo.instance_method(:foo)) # => Ractor::Error, expected UnboundMethod

[Eregon (Benoit Daloze)]

Methods can be defined via define_method { capture_state } and so rely on mutable state, so I guess this is only OK for def methods.

[marcandre (Marc-Andre Lafortune)]

Agreed, some methods can not be made shareable 👍.