我如何确保一次只运行一个Ruby脚本实例？

require 'ftools'

lock_file = File.new("script.lock", "w+")

if lock_file.flock(File::LOCK_EX | File::LOCK_NB) == false
  puts "Another instance of the script is already running."
  exit
else
  # Your script logic here
  # ...

  lock_file.flock(File::LOCK_UN)
end