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add uip git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1125 bbd45198-f89e-11dd-88c7-29a3b14d5316
2010-11-27 00:27:45 +08:00
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<h1>uip/timer.c</h1><a href="a00129.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/**</span>
<a name="l00002"></a>00002 <span class="comment"> * \addtogroup timer</span>
<a name="l00003"></a>00003 <span class="comment"> * @{</span>
<a name="l00004"></a>00004 <span class="comment"> */</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment">/**</span>
<a name="l00007"></a>00007 <span class="comment"> * \file</span>
<a name="l00008"></a>00008 <span class="comment"> * Timer library implementation.</span>
<a name="l00009"></a>00009 <span class="comment"> * \author</span>
<a name="l00010"></a>00010 <span class="comment"> * Adam Dunkels &lt;adam@sics.se&gt;</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="comment">/*</span>
<a name="l00014"></a>00014 <span class="comment"> * Copyright (c) 2004, Swedish Institute of Computer Science.</span>
<a name="l00015"></a>00015 <span class="comment"> * All rights reserved.</span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00018"></a>00018 <span class="comment"> * modification, are permitted provided that the following conditions</span>
<a name="l00019"></a>00019 <span class="comment"> * are met:</span>
<a name="l00020"></a>00020 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
<a name="l00021"></a>00021 <span class="comment"> * notice, this list of conditions and the following disclaimer.</span>
<a name="l00022"></a>00022 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
<a name="l00023"></a>00023 <span class="comment"> * notice, this list of conditions and the following disclaimer in the</span>
<a name="l00024"></a>00024 <span class="comment"> * documentation and/or other materials provided with the distribution.</span>
<a name="l00025"></a>00025 <span class="comment"> * 3. Neither the name of the Institute nor the names of its contributors</span>
<a name="l00026"></a>00026 <span class="comment"> * may be used to endorse or promote products derived from this software</span>
<a name="l00027"></a>00027 <span class="comment"> * without specific prior written permission.</span>
<a name="l00028"></a>00028 <span class="comment"> *</span>
<a name="l00029"></a>00029 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND</span>
<a name="l00030"></a>00030 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
<a name="l00031"></a>00031 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
<a name="l00032"></a>00032 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE</span>
<a name="l00033"></a>00033 <span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
<a name="l00034"></a>00034 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS</span>
<a name="l00035"></a>00035 <span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
<a name="l00036"></a>00036 <span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span>
<a name="l00037"></a>00037 <span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY</span>
<a name="l00038"></a>00038 <span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF</span>
<a name="l00039"></a>00039 <span class="comment"> * SUCH DAMAGE.</span>
<a name="l00040"></a>00040 <span class="comment"> *</span>
<a name="l00041"></a>00041 <span class="comment"> * This file is part of the uIP TCP/IP stack</span>
<a name="l00042"></a>00042 <span class="comment"> *</span>
<a name="l00043"></a>00043 <span class="comment"> * Author: Adam Dunkels &lt;adam@sics.se&gt;</span>
<a name="l00044"></a>00044 <span class="comment"> *</span>
<a name="l00045"></a>00045 <span class="comment"> * $Id: timer.c,v 1.2 2006/06/12 08:00:30 adam Exp $</span>
<a name="l00046"></a>00046 <span class="comment"> */</span>
<a name="l00047"></a>00047
<a name="l00048"></a>00048 <span class="preprocessor">#include "clock.h"</span>
<a name="l00049"></a>00049 <span class="preprocessor">#include "<a class="code" href="a00130.html">timer.h</a>"</span>
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00052"></a>00052 <span class="comment">/**</span>
<a name="l00053"></a>00053 <span class="comment"> * Set a timer.</span>
<a name="l00054"></a>00054 <span class="comment"> *</span>
<a name="l00055"></a>00055 <span class="comment"> * This function is used to set a timer for a time sometime in the</span>
<a name="l00056"></a>00056 <span class="comment"> * future. The function timer_expired() will evaluate to true after</span>
<a name="l00057"></a>00057 <span class="comment"> * the timer has expired.</span>
<a name="l00058"></a>00058 <span class="comment"> *</span>
<a name="l00059"></a>00059 <span class="comment"> * \param t A pointer to the timer</span>
<a name="l00060"></a>00060 <span class="comment"> * \param interval The interval before the timer expires.</span>
<a name="l00061"></a>00061 <span class="comment"> *</span>
<a name="l00062"></a>00062 <span class="comment"> */</span>
<a name="l00063"></a>00063 <span class="keywordtype">void</span>
<a name="l00064"></a><a class="code" href="a00156.html#g6614d96fdfcd95c95ec6e6f63071ff51">00064</a> <a class="code" href="a00156.html#g6614d96fdfcd95c95ec6e6f63071ff51">timer_set</a>(<span class="keyword">struct</span> <a class="code" href="a00087.html">timer</a> *t, clock_time_t interval)
<a name="l00065"></a>00065 {
<a name="l00066"></a>00066 t-&gt;<a class="code" href="a00087.html#fe557d333c06cf65f52023f45f5b0a3a">interval</a> = interval;
<a name="l00067"></a>00067 t-&gt;<a class="code" href="a00087.html#e8eb428c05bc1dee022246a3063d277c">start</a> = <a class="code" href="a00157.html#ge5b7160f2e653725ba5e2024c3cb7bff">clock_time</a>();
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00070"></a>00070 <span class="comment">/**</span>
<a name="l00071"></a>00071 <span class="comment"> * Reset the timer with the same interval.</span>
<a name="l00072"></a>00072 <span class="comment"> *</span>
<a name="l00073"></a>00073 <span class="comment"> * This function resets the timer with the same interval that was</span>
<a name="l00074"></a>00074 <span class="comment"> * given to the timer_set() function. The start point of the interval</span>
<a name="l00075"></a>00075 <span class="comment"> * is the exact time that the timer last expired. Therefore, this</span>
<a name="l00076"></a>00076 <span class="comment"> * function will cause the timer to be stable over time, unlike the</span>
<a name="l00077"></a>00077 <span class="comment"> * timer_rester() function.</span>
<a name="l00078"></a>00078 <span class="comment"> *</span>
<a name="l00079"></a>00079 <span class="comment"> * \param t A pointer to the timer.</span>
<a name="l00080"></a>00080 <span class="comment"> *</span>
<a name="l00081"></a>00081 <span class="comment"> * \sa timer_restart()</span>
<a name="l00082"></a>00082 <span class="comment"> */</span>
<a name="l00083"></a>00083 <span class="keywordtype">void</span>
<a name="l00084"></a><a class="code" href="a00156.html#gedaf3e48c2b04229b85455fb948468d6">00084</a> <a class="code" href="a00156.html#gedaf3e48c2b04229b85455fb948468d6">timer_reset</a>(<span class="keyword">struct</span> <a class="code" href="a00087.html">timer</a> *t)
<a name="l00085"></a>00085 {
<a name="l00086"></a>00086 t-&gt;<a class="code" href="a00087.html#e8eb428c05bc1dee022246a3063d277c">start</a> += t-&gt;<a class="code" href="a00087.html#fe557d333c06cf65f52023f45f5b0a3a">interval</a>;
<a name="l00087"></a>00087 }
<a name="l00088"></a>00088 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00089"></a>00089 <span class="comment">/**</span>
<a name="l00090"></a>00090 <span class="comment"> * Restart the timer from the current point in time</span>
<a name="l00091"></a>00091 <span class="comment"> *</span>
<a name="l00092"></a>00092 <span class="comment"> * This function restarts a timer with the same interval that was</span>
<a name="l00093"></a>00093 <span class="comment"> * given to the timer_set() function. The timer will start at the</span>
<a name="l00094"></a>00094 <span class="comment"> * current time.</span>
<a name="l00095"></a>00095 <span class="comment"> *</span>
<a name="l00096"></a>00096 <span class="comment"> * \note A periodic timer will drift if this function is used to reset</span>
<a name="l00097"></a>00097 <span class="comment"> * it. For preioric timers, use the timer_reset() function instead.</span>
<a name="l00098"></a>00098 <span class="comment"> *</span>
<a name="l00099"></a>00099 <span class="comment"> * \param t A pointer to the timer.</span>
<a name="l00100"></a>00100 <span class="comment"> *</span>
<a name="l00101"></a>00101 <span class="comment"> * \sa timer_reset()</span>
<a name="l00102"></a>00102 <span class="comment"> */</span>
<a name="l00103"></a>00103 <span class="keywordtype">void</span>
<a name="l00104"></a><a class="code" href="a00156.html#gcb807bd57e5489b386b876af5c1f163a">00104</a> <a class="code" href="a00156.html#gcb807bd57e5489b386b876af5c1f163a">timer_restart</a>(<span class="keyword">struct</span> <a class="code" href="a00087.html">timer</a> *t)
<a name="l00105"></a>00105 {
<a name="l00106"></a>00106 t-&gt;<a class="code" href="a00087.html#e8eb428c05bc1dee022246a3063d277c">start</a> = <a class="code" href="a00157.html#ge5b7160f2e653725ba5e2024c3cb7bff">clock_time</a>();
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00109"></a>00109 <span class="comment">/**</span>
<a name="l00110"></a>00110 <span class="comment"> * Check if a timer has expired.</span>
<a name="l00111"></a>00111 <span class="comment"> *</span>
<a name="l00112"></a>00112 <span class="comment"> * This function tests if a timer has expired and returns true or</span>
<a name="l00113"></a>00113 <span class="comment"> * false depending on its status.</span>
<a name="l00114"></a>00114 <span class="comment"> *</span>
<a name="l00115"></a>00115 <span class="comment"> * \param t A pointer to the timer</span>
<a name="l00116"></a>00116 <span class="comment"> *</span>
<a name="l00117"></a>00117 <span class="comment"> * \return Non-zero if the timer has expired, zero otherwise.</span>
<a name="l00118"></a>00118 <span class="comment"> *</span>
<a name="l00119"></a>00119 <span class="comment"> */</span>
<a name="l00120"></a>00120 <span class="keywordtype">int</span>
<a name="l00121"></a><a class="code" href="a00156.html#g6d71dececfce707c668e6257aad5906e">00121</a> <a class="code" href="a00156.html#g6d71dececfce707c668e6257aad5906e">timer_expired</a>(<span class="keyword">struct</span> <a class="code" href="a00087.html">timer</a> *t)
<a name="l00122"></a>00122 {
<a name="l00123"></a>00123 <span class="keywordflow">return</span> (clock_time_t)(<a class="code" href="a00157.html#ge5b7160f2e653725ba5e2024c3cb7bff">clock_time</a>() - t-&gt;<a class="code" href="a00087.html#e8eb428c05bc1dee022246a3063d277c">start</a>) &gt;= (clock_time_t)t-&gt;<a class="code" href="a00087.html#fe557d333c06cf65f52023f45f5b0a3a">interval</a>;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00126"></a>00126 <span class="comment"></span>
<a name="l00127"></a>00127 <span class="comment">/** @} */</span>
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