multithread FTP upload

gistfile1.rb

    require 'net/ftp'
    threads = []
    # creating threads
    4.times { |i|
      threads << Thread.new(i) {
        while path = paths.shift
          puts "uploading: #{path}"
          ftp = Net::FTP.new("{host}")
          ftp.passive = true; ftp.binary = true
          ftp.login("{username}", "{password}")
          ftp.chdir("/")
          ftp.putbinaryfile(path) if File.exists?(path)
        end
      }
    }
    threads.each { |th| th.join }