istener 1&gt;)
  &gt;
</pre>
</p>
<p><span class="fndoclabel">Notes</span> <br />On Common Lisp implementations without threads, <code>nil</code> is returned.
</p>
<p>The returned list of <a href="ref-glossary.html#gl:threads">threads</a> should not be destructively
altered.
</p>
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