You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: thread_signal.rb
    path of file: ./repos/resque/lib/resque
    
    the code of the file until where you have to start completion: class Resque::ThreadSignal
  de
    
  def wait_for_signal(timeout)
    @mutex.synchronize do
      unless @signaled
        @received.wait(@mutex, timeout)
      end

      @signaled
    end