gistfile1.txt

#!/usr/bin/env ruby

require 'socket'
require 'thread'

threads = Array.new
ports = [*(1..1024)]
mutex = Mutex.new

20.times do
  threads << Thread.new do |p|
    while port = mutex.synchronize{ ports.pop }
      begin
        t = TCPSocket.new("myserver.net", p).close
        puts "PORT #{p} OPEN"
      rescue
        puts "PORT #{p} CLOSED"
      end
    end
  end
end

threads.each(&:join)