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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>The Protothreads Library 1.0: lc-switch.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.6 --><div class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="globals.html">Globals</a></div><h1>lc-switch.h</h1><a href="a00008.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <span class="comment">/*</span>00002 <span class="comment"> * Copyright (c) 2004-2005, Swedish Institute of Computer Science.</span>00003 <span class="comment"> * All rights reserved. </span>00004 <span class="comment"> *</span>00005 <span class="comment"> * Redistribution and use in source and binary forms, with or without </span>00006 <span class="comment"> * modification, are permitted provided that the following conditions </span>00007 <span class="comment"> * are met: </span>00008 <span class="comment"> * 1. Redistributions of source code must retain the above copyright </span>00009 <span class="comment"> * notice, this list of conditions and the following disclaimer. </span>00010 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright </span>00011 <span class="comment"> * notice, this list of conditions and the following disclaimer in the </span>00012 <span class="comment"> * documentation and/or other materials provided with the distribution. </span>00013 <span class="comment"> * 3. Neither the name of the Institute nor the names of its contributors </span>00014 <span class="comment"> * may be used to endorse or promote products derived from this software </span>00015 <span class="comment"> * without specific prior written permission. </span>00016 <span class="comment"> *</span>00017 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND </span>00018 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE </span>00019 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE </span>00020 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE </span>00021 <span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL </span>00022 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS </span>00023 <span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) </span>00024 <span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT </span>00025 <span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY </span>00026 <span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF </span>00027 <span class="comment"> * SUCH DAMAGE. </span>00028 <span class="comment"> *</span>00029 <span class="comment"> * This file is part of the protothreads library.</span>00030 <span class="comment"> * </span>00031 <span class="comment"> * Author: Adam Dunkels <adam@sics.se></span>00032 <span class="comment"> *</span>00033 <span class="comment"> * $Id: lc-switch.h,v 1.2 2005/02/24 10:36:59 adam Exp $</span>00034 <span class="comment"> */</span>00035 <span class="comment"></span>00036 <span class="comment">/**</span>00037 <span class="comment"> * \addtogroup lc</span>00038 <span class="comment"> * @{</span>00039 <span class="comment"> */</span>00040 <span class="comment"></span>00041 <span class="comment">/**</span>00042 <span class="comment"> * \file</span>00043 <span class="comment"> * Implementation of local continuations based on switch() statment</span>00044 <span class="comment"> * \author Adam Dunkels <adam@sics.se></span>00045 <span class="comment"> *</span>00046 <span class="comment"> * This implementation of local continuations uses the C switch()</span>00047 <span class="comment"> * statement to resume execution of a function somewhere inside the</span>00048 <span class="comment"> * function's body. The implementation is based on the fact that</span>00049 <span class="comment"> * switch() statements are able to jump directly into the bodies of</span>00050 <span class="comment"> * control structures such as if() or while() statmenets.</span>00051 <span class="comment"> *</span>00052 <span class="comment"> * This implementation borrows heavily from Simon Tatham's coroutines</span>00053 <span class="comment"> * implementation in C:</span>00054 <span class="comment"> *</span>00055 <span class="comment"> * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html</span>00056 <span class="comment"> */</span>00057 00058 <span class="preprocessor">#ifndef __LC_SWITCH_H__</span>00059 <span class="preprocessor"></span><span class="preprocessor">#define __LC_SWTICH_H__</span>00060 <span class="preprocessor"></span>00061 <span class="comment">/* WARNING! lc implementation using switch() does not work if an</span>00062 <span class="comment"> LC_SET() is done within another switch() statement! */</span>00063 <span class="comment"></span>00064 <span class="comment">/** \hideinitializer */</span><a name="l00065"></a><a class="code" href="a00014.html#ga0">00065</a> <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> <a class="code" href="a00014.html#ga0">lc_t</a>;00066 00067 <span class="preprocessor">#define LC_SET(s) case __LINE__: s = __LINE__</span>00068 <span class="preprocessor"></span>00069 <span class="preprocessor">#define LC_RESUME(s) switch(s) { case 0:</span>00070 <span class="preprocessor"></span>00071 <span class="preprocessor">#define LC_END(s) }</span>00072 <span class="preprocessor"></span>00073 <span class="preprocessor">#define LC_INIT(s) s = 0;</span>00074 <span class="preprocessor"></span>00075 <span class="preprocessor">#endif </span><span class="comment">/* __LC_SWITCH_H__ */</span>00076 <span class="comment"></span>00077 <span class="comment">/** @} */</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Thu Feb 24 11:39:16 2005 for The Protothreads Library 1.0 by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.6 </small></address></body></html>⌨️ 快捷键说明
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