module Enumerable

# File lib/sitemap_gen/xml_crawler.rb, line 2
def with_multithread(thread_num)
  queue = Queue.new
  threads = (1..thread_num).map do
    Thread.new do
      until queue.empty?
        begin
          yield(queue.pop)
        rescue Exception
          nil
        end
      end
    end
  end

  each { |v| queue << v }
  threads.each { |t| t.join }
end