Feature #22441: Add Ractor#alive?

• Status: Open
• Assignee: -
• Target version: -

[jhawthorn (John Hawthorn)]

I propose adding Ractor#alive? as a non-blocking way to ask whether a Ractor has finished. This matches Thread#alive?/Fiber#alive?.

r = Ractor.new { Ractor.receive }
r.alive? #=> true
r << :done
r.join
r.alive? #=> false

This is already somewhat visible via Ractor#inspect, but that's quite awkward. We use this in the test suite.

r = Ractor.new{ sleep 1 }
r.inspect #=> "#<Ractor:#3 (irb):4 running>"
sleep 2
r.inspect #=> "#<Ractor:#3 (irb):4 terminated>"

After fork, other Ractors alive? will return false, as with Thread#alive?.

https://github.com/ruby/ruby/pull/19349

[jhawthorn (John Hawthorn)]

• Description updated (diff)

[ko1 (Koichi Sasada)]

Matz approved it.