# File lib/hammer_cli_csv/base.rb, line 80
    def thread_import(return_headers = false)
      csv = []
      CSV.foreach(option_csv_file || '/dev/stdin', {
                                                     :skip_blanks => true,
                                                     :headers => :first_row,
                                                     :return_headers => return_headers
                                                   }) do |line|
        csv << line
      end
      lines_per_thread = csv.length / option_threads.to_i + 1
      splits = []

      option_threads.to_i.times do |current_thread|
        start_index = ((current_thread) * lines_per_thread).to_i
        finish_index = ((current_thread + 1) * lines_per_thread).to_i
        finish_index = csv.length if finish_index > csv.length
        if start_index <= finish_index
          lines = csv[start_index...finish_index].clone
          splits << Thread.new do
            lines.each do |line|
              if line[NAME][0] != '#'
                yield line
              end
            end
          end
        end
      end

      splits.each do |thread|
        thread.join
      end
    end