Rails app with celluloid -- http://stackoverflow.com/questions/16694102/

log.txt

Started GET "/pages/create" for 127.0.0.1 at 2013-05-22 13:15:01 -0500
Processing by PagesController#create as HTML
About to sleep 2013-05-22 13:15:01 -0500
  Rendered pages/create.html.erb within layouts/application (0.5ms)
Completed 200 OK in 8ms (Views: 5.3ms | ActiveRecord: 0.0ms)
Awake! 2013-05-22 13:15:11 -0500

pages_controller.rb

class PagesController < ApplicationController
  def root
  end

  def create
    SleepyWorker.new.async.sleep_for(10)
  end
end

sleepy_worker.rb

class SleepyWorker
  include Celluloid

  def sleep_for(seconds=5)
    puts "About to sleep #{Time.now}"
    sleep seconds
    puts "Awake! #{Time.now}"
  end
end