1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>synchronize_rcu</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="ch01s09.html" title="Kernel utility functions"><link rel="prev" href="API-rcu-barrier-sched.html" title="rcu_barrier_sched"><link rel="next" href="API-synchronize-rcu-expedited.html" title="synchronize_rcu_expedited"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">synchronize_rcu</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-rcu-barrier-sched.html">Prev</a>&#160;</td><th width="60%" align="center">Kernel utility functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-synchronize-rcu-expedited.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-synchronize-rcu"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>synchronize_rcu &#8212; 
2  wait until a grace period has elapsed.
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <b class="fsfunc">synchronize_rcu </b>(</code></td><td> <var class="pdparam">void</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1108684852"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>void</code></em></span></dt><dd><p>
4     no arguments
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1108686460"></a><h2>Description</h2><p>
6   </p><p>
7
8   Control will return to the caller some time after a full grace
9   period has elapsed, in other words after all currently executing RCU
10   read-side critical sections have completed.  Note, however, that
11   upon return from <code class="function">synchronize_rcu</code>, the caller might well be executing
12   concurrently with new RCU read-side critical sections that began while
13   <code class="function">synchronize_rcu</code> was waiting.  RCU read-side critical sections are
14   delimited by <code class="function">rcu_read_lock</code> and <code class="function">rcu_read_unlock</code>, and may be nested.
15   </p><p>
16
17   See the description of <code class="function">synchronize_sched</code> for more detailed information
18   on memory ordering guarantees.
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