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Bug #17826

closed

Ractor#take hangs if used in multiple Threads

Added by kukunin (Sergiy Kukunin) about 3 years ago. Updated 8 months ago.

Status:
Closed
Assignee:
ko1 (Koichi Sasada)
Target version:
-
ruby -v:
ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x86_64-linux]
Backport:
2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
[ruby-core:103589]

Description

Hello there.

I was playing with Ractors (the awesome technology and the big leap for Ruby) and encountered weird behavior.

I tried to schedule and run Ractors in multiple threads, and found out, that Ractor#take hangs even if the ractor is finished.

Here is code to reproduce:

Array.new(2) do |n|
  Thread.new do
    r = Ractor.new do
      sleep 0.001
    end
    r.take
    puts "thread #{n} finished"
  end
end.each(&:join)

puts 'done'

The output is just "thread 0 finished" and the process hangs forever. Sometimes the second thread exists first, and the first freezes.

Thank you for your time. Hopefully, it's a valid bug report, not me just misusing the feature =)

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