[ruby-core:114260] [Ruby master Bug#19709] `Thread.join(timeout)` hangs in fiber scheduler.

Issue #19709 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED to 3.0: REQUIRED, 3.1: REQUIRED, 3.2: DONE

ruby_3_2 a3911b965f094f07080cf7adb22ee5e2e8555d86 merged revision(s) 0402193723647b8c4f57b1453fe2192ad2788d12.

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Bug #19709: `Thread.join(timeout)` hangs in fiber scheduler.
https://bugs.ruby-lang.org/issues/19709#change-103951

* Author: ioquatix (Samuel Williams)
* Status: Closed
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
* Backport: 3.0: REQUIRED, 3.1: REQUIRED, 3.2: DONE
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Unfortunately the following script can hang:

```ruby
require_relative 'test/fiber/scheduler'

scheduler = Scheduler.new
Fiber.set_scheduler scheduler

Fiber.schedule do
  thread = Thread.new{sleep}
  thread.join(0.1)
end
```

The termination condition in the `thread_join` is not expressed correctly.



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