graceful_worker_shutdown.rb

worker_thread = Thread.new do
  start_working_forever unless worker_thread[:stop]
end

default = trap(:INT) do
  timeout = 30
  slayer = Thread.new do
    sleep timeout
    worker_thread.terminate if worker_thread.alive?
  end
  trap(:INT, default)
  worker_thread[:stop] = true
  worker_thread.join
  exit
end

worker_thread.join