.svg?style=social&amp;colorA=999999" /></a> <a class="reference external" href="https://github.com/sbcl/sbcl/blob/master/src/code/target-thread.lisp/"><img alt="github" src="https://img.shields.io/badge/GitHub-View_the_source-5f9ea0.svg?style=social&amp;colorA=999999&amp;logo=github" /></a></p>
<blockquote>
<div><p>Decrement the count of SEMAPHORE by N if the count would not be negative.</p>
<p>Else blocks until the semaphore can be decremented. Returns the new count of
SEMAPHORE on success.</p>
<p>If TIMEO