simple_timeout.rb

def timeout(seconds = nil)
  timer_thread = Thread.start(Thread.current, Time.now) { |app_thread, start|
    sleep(seconds)
    app_thread.raise 'Execution timed out'
  }

  yield
ensure
  timer_thread.kill
  timer_thread.join
end

timeout(2.5) do
  puts '!!!!'
end

timeout(2.5) do
  sleep
end