From: "ko1 (Koichi Sasada) via ruby-core" <ruby-core@...>
Date: 2026-10-15T00:09:12+00:00
Subject: [ruby-core:127116] [Ruby Feature#22441] Add Ractor#alive?

Issue #22441 has been updated by ko1 (Koichi Sasada).


Matz approved it.

----------------------------------------
Feature #22441: Add Ractor#alive?
https://bugs.ruby-lang.org/issues/22441#change-119516

* Author: jhawthorn (John Hawthorn)
* Status: Open
----------------------------------------
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



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