Bug #17344

`Ractor#shareable?` confused by recursive structures

Added by marcandre (Marc-Andre Lafortune) about 2 months ago. Updated about 2 months ago.

Target version:
ruby -v:
ruby 3.0.0dev (2020-11-26T00:37:38Z master af80df1820) [x86_64-darwin17]


y = []; x = [y, {}].freeze; y << x; y.freeze
Ractor.shareable?(y) # => false, ok, the `{}` is not frozen
Ractor.shareable?(x) # => false, ok
Ractor.shareable?(y) # => true, not ok!

The error is that we can not mark anything as shareable until the whole tree has been searched successfully. Only when the full traversal is successful, then all visited objects can be marked as shareable. There might be a more clever way, but I couldn't think of one when working on my backport.


Updated by nobu (Nobuyoshi Nakada) about 2 months ago

  • Status changed from Open to Closed

Applied in changeset git|930a135524382ddd80c0608a7593b6cdfceee846.

Fixed Ractor.shareable? on cross-recursive objects [Bug #17344]

Updated by marcandre (Marc-Andre Lafortune) about 2 months ago

Thanks Nobu.

Same issue was still present with Ractor.make_shareable, which I fixed in

Please let me know if I missed something.

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