1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>Atomic and pointer manipulation</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="Basics.html" title="Chapter 1. Driver Basics"><link rel="prev" href="API-module-exit.html" title="module_exit"><link rel="next" href="API-atomic-read.html" title="atomic_read"></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">Atomic and pointer manipulation</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-module-exit.html">Prev</a> </td><th width="60%" align="center">Chapter 1. Driver Basics</th><td width="20%" align="right"> <a accesskey="n" href="API-atomic-read.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp1104144836"></a>Atomic and pointer manipulation</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-atomic-read.html"><span class="phrase">atomic_read</span></a></span><span class="refpurpose"> — 2 read atomic variable 3 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-set.html"><span class="phrase">atomic_set</span></a></span><span class="refpurpose"> — 4 set atomic variable 5 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-add.html"><span class="phrase">atomic_add</span></a></span><span class="refpurpose"> — 6 add integer to atomic variable 7 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-sub.html"><span class="phrase">atomic_sub</span></a></span><span class="refpurpose"> — 8 subtract integer from atomic variable 9 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-sub-and-test.html"><span class="phrase">atomic_sub_and_test</span></a></span><span class="refpurpose"> — 10 subtract value from variable and test result 11 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-inc.html"><span class="phrase">atomic_inc</span></a></span><span class="refpurpose"> — 12 increment atomic variable 13 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-dec.html"><span class="phrase">atomic_dec</span></a></span><span class="refpurpose"> — 14 decrement atomic variable 15 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-dec-and-test.html"><span class="phrase">atomic_dec_and_test</span></a></span><span class="refpurpose"> — 16 decrement and test 17 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-inc-and-test.html"><span class="phrase">atomic_inc_and_test</span></a></span><span class="refpurpose"> — 18 increment and test 19 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-add-negative.html"><span class="phrase">atomic_add_negative</span></a></span><span class="refpurpose"> — 20 add and test if negative 21 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-add-return.html"><span class="phrase">atomic_add_return</span></a></span><span class="refpurpose"> — 22 add integer and return 23 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-sub-return.html"><span class="phrase">atomic_sub_return</span></a></span><span class="refpurpose"> — 24 subtract integer and return 25 </span></dt><dt><span class="refentrytitle"><a href="API---atomic-add-unless.html"><span class="phrase">__atomic_add_unless</span></a></span><span class="refpurpose"> — 26 add unless the number is already a given value 27 </span></dt><dt><span class="refentrytitle"><a href="API-atomic-inc-short.html"><span class="phrase">atomic_inc_short</span></a></span><span class="refpurpose"> — 28 increment of a short integer 29 </span></dt></dl></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-module-exit.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Basics.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-atomic-read.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">module_exit</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">atomic_read</span></td></tr></table></div></body></html> 30