<!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/xhtml;charset=UTF-8"/> <title>libstdc++: atomic_word.h Source File</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript"> $(document).ready(initResizable); </script> <link href="doxygen.css" rel="stylesheet" type="text/css"/> </head> <body> <!-- Generated by Doxygen 1.7.4 --> <div id="top"> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td style="padding-left: 0.5em;"> <div id="projectname">libstdc++</div> </td> </tr> </tbody> </table> </div> </div> <div id="side-nav" class="ui-resizable side-nav-resizable"> <div id="nav-tree"> <div id="nav-tree-contents"> </div> </div> <div id="splitbar" style="-moz-user-select:none;" class="ui-resizable-handle"> </div> </div> <script type="text/javascript"> initNavTree('a00759.html',''); </script> <div id="doc-content"> <div class="header"> <div class="headertitle"> <div class="title">atomic_word.h</div> </div> </div> <div class="contents"> <a href="a00759.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Low-level type for atomic operations -*- C++ -*-</span> <a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="comment">// Copyright (C) 2004, 2009 Free Software Foundation, Inc.</span> <a name="l00004"></a>00004 <span class="comment">//</span> <a name="l00005"></a>00005 <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span> <a name="l00006"></a>00006 <span class="comment">// software; you can redistribute it and/or modify it under the</span> <a name="l00007"></a>00007 <span class="comment">// terms of the GNU General Public License as published by the</span> <a name="l00008"></a>00008 <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span> <a name="l00009"></a>00009 <span class="comment">// any later version.</span> <a name="l00010"></a>00010 <a name="l00011"></a>00011 <span class="comment">// This library is distributed in the hope that it will be useful,</span> <a name="l00012"></a>00012 <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span> <a name="l00013"></a>00013 <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span> <a name="l00014"></a>00014 <span class="comment">// GNU General Public License for more details.</span> <a name="l00015"></a>00015 <a name="l00016"></a>00016 <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span> <a name="l00017"></a>00017 <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span> <a name="l00018"></a>00018 <span class="comment">// 3.1, as published by the Free Software Foundation.</span> <a name="l00019"></a>00019 <a name="l00020"></a>00020 <span class="comment">// You should have received a copy of the GNU General Public License and</span> <a name="l00021"></a>00021 <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span> <a name="l00022"></a>00022 <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span> <a name="l00023"></a>00023 <span class="comment">// <http://www.gnu.org/licenses/>.</span> <a name="l00024"></a>00024 <span class="comment"></span> <a name="l00025"></a>00025 <span class="comment">/** @file atomic_word.h</span> <a name="l00026"></a>00026 <span class="comment"> * This file is a GNU extension to the Standard C++ Library.</span> <a name="l00027"></a>00027 <span class="comment"> */</span> <a name="l00028"></a>00028 <a name="l00029"></a>00029 <span class="preprocessor">#ifndef _GLIBCXX_ATOMIC_WORD_H</span> <a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor">#define _GLIBCXX_ATOMIC_WORD_H 1</span> <a name="l00031"></a>00031 <span class="preprocessor"></span> <a name="l00032"></a>00032 <span class="keyword">typedef</span> <span class="keywordtype">int</span> _Atomic_word; <a name="l00033"></a>00033 <a name="l00034"></a>00034 <span class="comment">// Define these two macros using the appropriate memory barrier for the target.</span> <a name="l00035"></a>00035 <span class="comment">// The commented out versions below are the defaults.</span> <a name="l00036"></a>00036 <span class="comment">// See ia64/atomic_word.h for an alternative approach.</span> <a name="l00037"></a>00037 <a name="l00038"></a>00038 <span class="comment">// This one prevents loads from being hoisted across the barrier;</span> <a name="l00039"></a>00039 <span class="comment">// in other words, this is a Load-Load acquire barrier.</span> <a name="l00040"></a>00040 <span class="comment">// This is necessary iff TARGET_RELAXED_ORDERING is defined in tm.h. </span> <a name="l00041"></a>00041 <span class="comment">// #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")</span> <a name="l00042"></a>00042 <a name="l00043"></a>00043 <span class="comment">// This one prevents stores from being sunk across the barrier; in other</span> <a name="l00044"></a>00044 <span class="comment">// words, a Store-Store release barrier.</span> <a name="l00045"></a>00045 <span class="comment">// #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")</span> <a name="l00046"></a>00046 <a name="l00047"></a>00047 <span class="preprocessor">#endif </span> </pre></div></div> </div> <div id="nav-path" class="navpath"> <ul> <li class="navelem"><a class="el" href="a00759.html">atomic_word.h</a> </li> <li class="footer">Generated by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.4 </li> </ul> </div> </body> </html>