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class="cT"> <h2>新聞中心</h2> </div> <div id="udmhr3g" class="hLocation"> <p><a href="http://dyxdggzs.com" target="_blank">EEPW首頁(yè)</a> > <a href="/info/industry/special/embedded">嵌入式系統</a> > <a href="/info/articlelist/special/embedded/type/5">設計應用</a> > Buddy算法的μC/OSII高可靠?jì)却婀芾矸桨?/p> </div> </div> </div>    <div class="nynjgax" id="container"> <section> <article> <h1>Buddy算法的μC/OSII高可靠?jì)却婀芾矸桨?/h1> <div id="ezvohew" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2012-03-08</span> <span>來(lái)源：網(wǎng)絡(luò )</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="jupyrlf" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://dyxdggzs.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://dyxdggzs.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br 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src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p>1 <a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/內存"><em>內存</em></a><a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/管理"><em>管理</em></a>概述</p>本文引用地址：<a href="http://dyxdggzs.com/article/149483.htm">http://dyxdggzs.com/article/149483.htm</a><p><a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/內存"><em>內存</em></a><a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/管理"><em>管理</em></a>是操作系統的中心任務(wù)之一，其主要任務(wù)是組織<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/內存"><em>內存</em></a>以容納內核和待執行程序，跟蹤當前內存的使用情況，在需要時(shí)為進(jìn)程分配內存，使用完畢后釋放并回收內存。目前嵌入式系統中常用的內存<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/管理"><em>管理</em></a>策略主要有兩種--靜態(tài)內存分配和動(dòng)態(tài)內存分配。</p><p>靜態(tài)內存分配：編譯或鏈接時(shí)將所需內存分配好，程序運行起來(lái)后所分配的內存不釋放。對于實(shí)時(shí)性和<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/可靠"><em>可靠</em></a>性要求極高的系統，不允許延遲或者分配失效，必須采用靜態(tài)內存分配的方式。</p><p>動(dòng)態(tài)內存分配：根據程序執行過(guò)程中所需內存的大小而動(dòng)態(tài)分配內存的策略。此<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/方案"><em>方案</em></a>按需分配內存，避免了靜態(tài)分配中的內存浪費，靈活性比較強，給程序的實(shí)現帶來(lái)了很大方便。缺點(diǎn)是容易造成內存碎片，且容易造成程序響應不及時(shí)等問(wèn)題。</p><p>綜上所述，靜態(tài)內存分配和動(dòng)態(tài)內存分配各有優(yōu)點(diǎn)，出于嵌入式系統<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/可靠"><em>可靠</em></a>性、實(shí)時(shí)性及成本、功耗的考慮，如何在兩種<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/方案"><em>方案</em></a>中作出平衡的選擇是令嵌入式操作系統設計者頭疼的事。一般的嵌入式操作系統都是兩種<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/方案"><em>方案</em></a>的高效結合，μ<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/C/OSII"><em>C/OSII</em></a>也不例外。除此之外，嵌入式操作系統對內存的分配還有以下幾點(diǎn)要求：</p><p>① <a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/可靠"><em>可靠</em></a>性。內存分配的請求必須得到滿(mǎn)足，如果分配失敗可能會(huì )帶來(lái)災難性的后果。比如，航天飛機的嵌入式操作系統若發(fā)生內存分配失效，損失是不可估量的。</p><p>② 快速性。嵌入式系統對實(shí)時(shí)性的保證，要求簡(jiǎn)單、快速地分配內存。</p><p>③ 高效性。嵌入式系統中內存是一種有限、昂貴的資源，內存分配要盡可能地減少浪費。</p><p>μ<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/C/OSII"><em>C/OSII</em></a>作為一種典型的嵌入式操作系統，其內存管理同樣要滿(mǎn)足以上3點(diǎn)要求，下面簡(jiǎn)單介紹μ<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/C/OSII"><em>C/OSII</em></a>的內存管理策略，并分析其不足之處。</p><p>2 μC/OSII動(dòng)態(tài)內存管理方案及不足</p><p>2.1 μC/OSII內存管理方案簡(jiǎn)介</p><p>μC/OSII內存管理模塊主要由一個(gè)數據結構體和5個(gè)函數組成：</p><p>　　◆ 內存控制塊數據結構OS_MEM；</p><p>　　◆ 內存分區創(chuàng )建函數OSMemCreate（void *addr, INT32U nblks, INT32U blksize, INT8U *err）；</p><p>　　◆ 內存塊分配函數OSMemGet（OS_MEM *pmem , INT8U *err）；</p><p>　　◆ 內存塊釋放函數OSMemPut（OS_MEM *pmem , void *pblk）；</p><p>　　◆ 內存分區狀態(tài)查詢(xún)函數OSMemQuery（OS_MEM *pmem, OS_MEM_DATA *p_mem_data）；</p><p>　　◆ 內存控制塊鏈表初始化函數OSMemInit（void）。</p><p>μC/OSII用一個(gè)內存控制塊（OS_MEM）來(lái)管理內存分區，主要通過(guò)以下4步來(lái)管理：</p><p>① 內存控制塊鏈表初始化函數OSMemInit（）負責創(chuàng )建空內存控制塊結構的鏈表，鏈表長(cháng)度由內核OS_CFG.H文件中定義的OS_MAX_MEM_PART宏確定。</p><p>② 內存塊創(chuàng )建函數OSMemCreate（）先從空內存控制塊結構鏈表上獲取一個(gè)空的內存控制根塊結構，根據用戶(hù)需要內存塊的大小來(lái)創(chuàng )建分區。一個(gè)分區中含有相同大小的內存塊，各內存塊也是通過(guò)鏈表鏈接起來(lái)，而不同分區中的內存塊大小一般不同，如圖1所示的PartitiON # 1和Partition # 2中內存塊的大小是不同的。</p><p style="text-align: center"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border="0" src="http://uphotos.eepw.com.cn/fetch/20130729/149483_1_0.jpg" alt="" /></p><p align="center"><font face="Verdana">圖1 μC/OSII通過(guò)內存控制塊管理內存</font></p><p style="text-align: left"><font face="Verdana">③ 內存塊分配函數OSMemGet（）通過(guò)從內存控制塊鏈表中找到能夠滿(mǎn)足自己內存塊需要的內存控制塊，然后從這個(gè)內存控制塊指向的分區鏈表首部得到自己需要的內存塊。</font></p><p style="text-align: left"><font face="Verdana">④ 內存塊釋放函數OSMemPut（）負責回收內存塊。當應用程序不再使用某一個(gè)內存塊時(shí)，必須及時(shí)把它釋放，并放回到相應的內存分區中。</font></p><p style="text-align: left"><font face="Verdana">2.2 μC/OSII內存管理方案的不足之處</font></p><p style="text-align: left"><font face="Verdana">如前所述，μC/OSII的內存管理方案簡(jiǎn)短精煉，僅百余行代碼，5個(gè)函數就能勝任。然而考慮到第1節提到的嵌入式系統對內存管理策略的3個(gè)要求，μC/OSII的內存管理策略存在以下不足之處：</font></p><p style="text-align: left"><font face="Verdana">① 原μC/OSII內存管理方案可靠性不高。因為原方案中各內存分區之間是孤立的，沒(méi)有聯(lián)系。一個(gè)內存分區上的內存塊用完時(shí)，不能利用其他分區上的內存塊，而只是簡(jiǎn)單地報錯，從而使系統可靠性大大降低。在內存塊大小及需求量不確定的場(chǎng)合，如果經(jīng)常發(fā)生內存申請得不到滿(mǎn)足的情況，是嵌入式系統所不能容忍的。</font></p><p style="text-align: left"><font face="Verdana">② 原μC/OSII內存管理方案中內存分配不夠靈活。舉個(gè)例子來(lái)說(shuō)，一個(gè)應用程序需要大小為1 KB、512 B、256 B三種內存塊，原方案有兩種解決方案，一是創(chuàng )建一個(gè)內存塊大小為1 KB的內存分區，內存塊數目至少為3個(gè)；二是創(chuàng )建3個(gè)內存分區，內存塊大小分別為1 KB、512 B、256 B。方案一創(chuàng )建了較少分區，性能有保證，但造成內存資源的浪費；方案二雖然沒(méi)有浪費內存，但卻調用3次OS_MemCreate（）函數，效率較低。</font></p><p style="text-align: left"><font face="Verdana"></span>  <div class="qo8ivqj" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="woidpie" class="hAd8"> <br></span>  <div id="oheyuoj" class="quotes"> <span id="rpl7cvq" class="pre">上一頁(yè)</span> <span id="32zuqeb" class="current">1</span> <a href="149483_2.htm">2</a> <a href="149483_2.htm">下一頁(yè)</a> </div>  </div> </article> <div id="yjcwiea" class="clear"></div> <br/> <div id="em2jdyu" class="hAd6"> <div class="izysngb" id="relA" style="width:auto;height:auto;"> <ul> <li>  <iframe id='af71d594' 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