gistfile1.rb

  def test_switch_while_busy_loop
    bug1402 = "[ruby-dev:38319] [Bug #1402]"
    flag = true
    th = Thread.current
    waiter = Thread.start {
      sleep 0.1
      flag = false
      sleep 1
      th.raise(bug1402)
    }
    assert_nothing_raised(RuntimeError, bug1402) do
      nil while flag
    end
    assert(!flag, bug1402)
  ensure
    waiter.kill.join
  end