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Bug #17344

closed

`Ractor#shareable?` confused by recursive structures

Added by marcandre (Marc-Andre Lafortune) over 3 years ago. Updated over 3 years ago.

Status:
Closed
Target version:
ruby -v:
ruby 3.0.0dev (2020-11-26T00:37:38Z master af80df1820) [x86_64-darwin17]
[ruby-core:101088]

Description

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.

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