Simple process ring using ruby continuations

process-ring.rb

require "continuation" # ruby 1.9, 1.8 doesn't need this require

class Ring
    def initalize
        @next_node = nil
    end
    attr_accessor :next_node
    def create_continuation
        passesleft, message = callcc { |cont|
            return cont
        }
        if passesleft <= 0
            puts "done"
            exit 0
        end
        @next_node.call(passesleft - 1, message)
    end
end

def run(number_of_rings, cycles, message)
    processes = Array.new(number_of_rings) { Ring.new }
    continuations = processes.collect { |p| p.create_continuation }
    processes.each_with_index { |p,i| p.next_node = continuations[(i+1) % number_of_rings] }
    continuations[0].call(number_of_rings * cycles, message)
end

run ARGV[0].to_i, ARGV[1].to_i, "The quick brown fox jumps over the lazy dog"