Bug #20907: Fiber scheduler does not correctly re-lock mutex if `Mutex#sleep` is interrupted.

• Status: Closed
• Assignee: ioquatix (Samuel Williams)
• Target version: -
• Backport: 3.1: REQUIRED, 3.2: DONE, 3.3: REQUIRED

[ioquatix (Samuel Williams)]

The following test fails with a ThreadError instead of a RuntimeError:

  def test_condition_variable
    condition_variable = ::Thread::ConditionVariable.new
    mutex = ::Thread::Mutex.new

    error = nil

    thread = Thread.new do
      Thread.current.report_on_exception = false

      scheduler = Scheduler.new
      Fiber.set_scheduler scheduler

      fiber = Fiber.schedule do
        begin
          mutex.synchronize do
            condition_variable.wait(mutex)
          end
        rescue => error
        end
      end

      fiber.raise(RuntimeError)
    end

    thread.join
    assert_kind_of RuntimeError, error
  end

Fix: https://github.com/ruby/ruby/pull/12158

• Status changed from Open to Closed

Applied in changeset git|a8c2d5e7bee5fad0965baeb58d312ddc5932ec26.

---

Ensure fiber scheduler re-acquires mutex when interrupted from sleep. (#12158)

[Bug #20907]

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED to 3.1: REQUIRED, 3.2: DONE, 3.3: REQUIRED

ruby_3_2 87249cbddb5dbac16cb7f0fa33958a42389759cb merged revision(s) a8c2d5e7bee5fad0965baeb58d312ddc5932ec26.