span> <br />Decrement the <a href="ref-glossary.html#gl:fixnum">fixnum</a> value stored in
<nobr><var>place</var></nobr> as an <a href="ref-glossary.html#id5">atomic&nbsp;operation</a>.
</p>
<p><span class="fndoclabel">Package</span>&nbsp;&nbsp;&nbsp;<code>:portable-threads</code>
</p>
<p><span class="fndoclabel">Module</span>&nbsp;&nbsp;&nbsp;<code>:portable-threads</code>
</p>
<p><span class="fndoclabel">Arguments and values</span><table class="tighttop">
<tr valign="top"><td valign="baseline" nowrap><i>p