defer-thread.rb

#!/usr/bin/env ruby

class DeferredThread < Object
  def initialize &code
    @proc = code
  end

  def invoke
    Thread.new { @proc.call }
  end
end

deferred_threads = (1..100).collect do |i|
  DeferredThread.new do
    puts "first: #{i}"
    Thread.pass
    puts "second: #{i}"
  end
end

deferred_threads.each(&:invoke)