thread_demo.rb

class Actor
  def ping
    puts "#{self.class.name}:ping"
  end
end

class SinatraApp < Actor
  def run
    loop do
      puts :whoa?
      sleep 2
    end
  end
end

class BigBrother < Actor
  def run
    loop do
      puts :whee
      sleep 3
    end
  end
end

class Runner
  def initialize
    @sinatra = SinatraApp.new
    @big_brother = BigBrother.new

    @threads = []
    @threads << Thread.new { @sinatra.run }
    @threads << Thread.new { @big_brother.run }
    @threads << Thread.new { monitor }

    @threads.each {|t| t.join}
  end

  def monitor
    loop do
      @sinatra.ping
      @big_brother.ping
      sleep 1
    end
  end
end

Runner.new