From: marcandre-ruby-core@... Date: 2020-11-26T09:46:49+00:00 Subject: [ruby-core:101088] [Ruby master Bug#17344] `Ractor#shareable?` confused by recursive structures Issue #17344 has been reported by marcandre (Marc-Andre Lafortune). ---------------------------------------- Bug #17344: `Ractor#shareable?` confused by recursive structures https://bugs.ruby-lang.org/issues/17344 * Author: marcandre (Marc-Andre Lafortune) * Status: Open * Priority: Normal * Assignee: ko1 (Koichi Sasada) * Target version: 3.0 * ruby -v: ruby 3.0.0dev (2020-11-26T00:37:38Z master af80df1820) [x86_64-darwin17] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN ---------------------------------------- ```ruby 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. -- https://bugs.ruby-lang.org/ Unsubscribe: