philosopher.rb

class Philosopher < Thread

  attr_accessor :name, :left_chopstick, :right_chopstick, :finished

  def initialize args = {}
    args.each_pair { |attribute, value| self.__send__ "#{attribute}=", value }
    @finished = false
    # puts "#{name} (#{left_chopstick.id},#{right_chopstick.id})"
    super { start }
  end

  def eat
    left_chopstick.synchronize {
      right_chopstick.synchronize {
        emote 'is eating'
        ponder
      }
    }
  end

  def think
    emote 'is thinking'
    ponder
  end

  def ponder min=4, max=8
    return if @finished
    sleep rand min..max
  end

  def emote str
    $g_lock.synchronize {
      puts "#{name} #{str}"
    }
  end

  def start
    sleep 1
    while !@finished
      think
      break if @finished
      eat
    end
    emote 'is finished'
  end

  def stop
    @finished = true
  end

end