title: How can I get a list of callbacks in the Node work queue? (or, Why won't Node exit?)
body: <p>It says on the <a href="http://nodejs.org/about/">Node.js about page</a>:</p>
  
  <blockquote>
    <p>Node exits the event loop when there are no more callbacks to perform.</p>
  </blockquote>
  
  <p>Is there a way to find out which callbacks are keeping Node from exiting? </p>