Crude demo of async I/O using Celluloid::IO Actor with external class utilizing Celluoid::IO::TCPSocket. No need for GIL-less Ruby for this to work (except perhaps on the server, which isn't using evented IO for this demo)

client.rb

require 'celluloid'
require 'celluloid/io'


class MySocket
  def go
    @sock ||= Celluloid::IO::TCPSocket.open('localhost', 2000)
    puts "#{@sock.read}"
  end
end


class MyProcessor
  include Celluloid::IO

  def run
    @sock ||= MySocket.new
    "#{@sock.go} #{@sock.go}"
  end
end

worker = MyProcessor.new

2.times {
  worker.future.run
}

server.rb

require 'socket'
server = TCPServer.new(2000)
i = 0
loop do
  client = server.accept
  i += 1
  puts "Client connected!"
  Thread.new do
    client_num = i
    client.puts "Hi client #{client_num}!"
    if i > 1
      sleep 5
    else
      sleep 30
    end
    client.puts "Bye client #{client_num}!"
    client.close
    puts "Closed connection #{client_num}"
  end
end