<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>try_wait_for_completion</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="ch01s03.html" title="Delaying, scheduling, and timer routines" /><link rel="prev" href="re45.html" title="wait_for_completion_killable" /><link rel="next" href="re47.html" title="completion_done" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>try_wait_for_completion</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re45.html">Prev</a> </td><th width="60%" align="center">Delaying, scheduling, and timer routines</th><td width="20%" align="right"> <a accesskey="n" href="re47.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="try_wait_for_completion"><a id="API-try-wait-for-completion"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>try_wait_for_completion — try to decrement a completion without blocking </p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">bool <b class="fsfunc">try_wait_for_completion </b>(</code></td><td>struct completion * <var class="pdparam">x</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2599875"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>x</code></em></span></dt><dd><p> completion structure </p></dd></dl></div></div><div class="refsect1" title="Returns"><a id="id2599901"></a><h2>Returns</h2><p> 0 if a decrement cannot be done without blocking 1 if a decrement succeeded. </p><p> If a completion is being used as a counting completion, attempt to decrement the counter without blocking. This enables us to avoid waiting if the resource the completion is protecting is not available. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re45.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch01s03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re47.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>wait_for_completion_killable</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>completion_done</span></td></tr></table></div></body></html>