<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <HTML ><HEAD ><TITLE >Bit Operations</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="The Linux Kernel API" HREF="book1.html"><LINK REL="UP" TITLE="Basic C Library Functions" HREF="c824.html"><LINK REL="PREVIOUS" TITLE="memchr" HREF="r1893.html"><LINK REL="NEXT" TITLE="set_bit" HREF="r1938.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The Linux Kernel API</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="r1893.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Basic C Library Functions</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="r1938.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="AEN1936" ></A >Bit Operations</H1 ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT ><A HREF="r1938.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >set_bit</SPAN ></SPAN ></A > -- Atomically set a bit in memory </DT ><DT ><A HREF="r1973.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >__set_bit</SPAN ></SPAN ></A > -- Set a bit in memory </DT ><DT ><A HREF="r2007.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >clear_bit</SPAN ></SPAN ></A > -- Clears a bit in memory </DT ><DT ><A HREF="r2043.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >__change_bit</SPAN ></SPAN ></A > -- Toggle a bit in memory </DT ><DT ><A HREF="r2077.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >change_bit</SPAN ></SPAN ></A > -- Toggle a bit in memory </DT ><DT ><A HREF="r2112.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >test_and_set_bit</SPAN ></SPAN ></A > -- Set a bit and return its old value </DT ><DT ><A HREF="r2145.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >__test_and_set_bit</SPAN ></SPAN ></A > -- Set a bit and return its old value </DT ><DT ><A HREF="r2178.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >test_and_clear_bit</SPAN ></SPAN ></A > -- Clear a bit and return its old value </DT ><DT ><A HREF="r2211.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >__test_and_clear_bit</SPAN ></SPAN ></A > -- Clear a bit and return its old value </DT ><DT ><A HREF="r2244.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >test_and_change_bit</SPAN ></SPAN ></A > -- Change a bit and return its new value </DT ><DT ><A HREF="r2277.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >test_bit</SPAN ></SPAN ></A > -- Determine whether a bit is set </DT ><DT ><A HREF="r2307.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >find_first_zero_bit</SPAN ></SPAN ></A > -- find the first zero bit in a memory region </DT ><DT ><A HREF="r2340.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >find_next_zero_bit</SPAN ></SPAN ></A > -- find the first zero bit in a memory region </DT ><DT ><A HREF="r2377.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >ffz</SPAN ></SPAN ></A > -- find first zero in word. </DT ><DT ><A HREF="r2403.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >ffs</SPAN ></SPAN ></A > -- find first bit set </DT ><DT ><A HREF="r2429.html" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >hweight32</SPAN ></SPAN ></A > -- returns the hamming weight of a N-bit word </DT ></DL ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="r1893.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="book1.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="r1938.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >memchr</SPAN ></SPAN ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="c824.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >set_bit</SPAN ></SPAN ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >