Gem::GemcutterUtilities#wait_for_otp_thread

# File tmp/rubies/ruby-4.0.0/lib/rubygems/gemcutter_utilities.rb, line 291
def wait_for_otp_thread(*threads)
  loop do
    threads.each do |otp_thread|
      return otp_thread unless otp_thread.alive?
    end
    sleep 0.1
  end
ensure
  threads.each(&:exit)
end