A better Ping-Pong example using Actors in Rubinius2.0.0dev. Ends only when you press enter or something

ping_pong.rb

require 'actor'

Ping = Struct.new :sender
Pong = Struct.new :sender

Actor.spawn do
  Actor.register(:ping, Actor.current)
  loop do
    Actor.receive do |msg|
      msg.when(Ping) do |p|
        puts "ping"
        p.sender << Pong.new(Actor.current)
      end
    end
  end
end

Actor.spawn do
  Actor[:ping] << Ping.new(Actor.current)
  loop do
    Actor.receive do |msg|
      msg.when(Pong) do |p|
        puts "pong"
        p.sender << Ping.new(Actor.current)
      end
    end
  end
end

gets