timeout.rb

require 'timeout'

begin
  Timeout.timeout(0.1) do
    begin
      sleep 0.2

    # Timeout::ExitException gets raised on the main thread. We can rescue it to
    # detect a timeout and add special handling.
    rescue Timeout::ExitException
      puts "Got a timeout"
      raise

    # This code will also run upon timeout (and also when we don't timeout, obviously)
    ensure
      puts "Ensure called"
    end
  end

# Outside of the timeout block, the ExitException is caught and a Timeout::Error
# is raised in its place.
rescue Timeout::Error
  puts "Block timed out"
end