sleep sort examples inspired by http://dis.4chan.org/read/prog/1295544154

coolio.rb

# -- coding: utf-8

require "rubygems"
require "cool.io"

class SleepSort < Coolio::TimerWatcher
  def initialize(num)
    super(*num.to_f)
    @num = num
  end

  def on_timer
    puts @num
    detach
  end
end

coolio = Coolio::Loop.default
ARGV.each{|n|
  coolio.attach SleepSort.new(n)
}
coolio.run

eventmachine.rb

# -- coding: utf-8

require "rubygems"
require "eventmachine"

EM.run do
  counter = ARGV.length
  ARGV.each{|n|
    EM.add_timer(n.to_f) do
      puts n
      EM.stop if (counter -= 1) == 0
    end
  }
end

thread.rb

# -- coding: utf-8

require "thread"

ARGV.map{|n|
  Thread.start(n) do
    sleep n.to_f
    puts n
  end
}.each(&:join)