gistfile1.txt

#!/usr/bin/env ruby

require 'pp'

input  = (0 .. 10).to_enum

enums   = [input]
threads = []

10.times do |i|
  enums << Enumerator.new do |output|
    threads << Thread.new(enums[i], output) do |i, o|
      i.each { |e| o << (e + 1) }
    end
  end
end

enums.last.each { |e| p e }

threads.each { |t| t.join }