trap_loop.rb

class TrapLoop
  trap('TERM') { stop! }
  trap('INT')  { stop! }
  trap('SIGTERM') { stop! }

  def self.stop!
    @loop = false
  end

  def self.safe_exit_point!
    if @started && !@loop
      raise Interrupt
    end
  end

  def self.start(&block)
    @started = true
    @loop = true
    while(@loop) do
      yield
    end
  end

end

#use like this:
class Worker

  def self.work!
    puts "working"
    sleep 2
    puts "worked"
    TrapLoop.safe_exit_point!
    puts "more stuff"
    sleep 2
    puts "done"
  end

end

begin
  TrapLoop.start do
    Worker.work!
  end
rescue => e
  puts e.inspect
end