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    發布日期: 2021-09-04
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資源簡介

可變分區調度算法有:最先適應分配算法,最優適應分配算法,最壞適應算法。 用戶提出內存空間的申請；系統根據申請者的要求，按照一定的分配策略分析內存空間的使用情況，找出能滿足請求的空閑區，分給申請者；當程序執行完畢或主動歸還內存資源時，系統要收回它所占用的內存空間或它歸還的部分內存空間。 每當一個進程被創建時，內存分配程序首先要查找空閑內存分區表（鏈），從中尋找一個合適的空閑塊進行劃分，并修改空閑內存分區表（鏈）。當進程運行完畢釋放內存時，系統根據回收區的首址，從空閑區表（鏈）中找到相應的插入點，此時出現如下四種情況： 1) 回收區與插入點的前一個空閑分區F1相鄰接，此時可將回收區直接與F1合并，并修改F1的大小； 2) 回收區與插入點的后一個空閑分區F2相鄰接，此時可將回收區直接與F2合并，并用回收區的首址最為新空閑區的首址，大小為二者之和； 3) 回收區同時與插入點的前、后兩個空閑分區鄰接，此時需將三者合并； 4) 回收區不與任何一個空閑區鄰接，此時應建一新的表項。

資源截圖

代碼片段和文件信息 

package?com.chengshijian.operatesystem;

import?java.util.Scanner;

/**
?*?Created?by?ChengShiJian?on?2017/11/08.
?*?
?*/

public?class?DynamicPartAllocate?{

????public?static?void?main（String[]?args）?{
????????//?TODO?Auto-generated?method?stub
????????System.out.println（“軟件1503??程世健?1511030304“）;
????????final?Scanner?scanner?=?new?Scanner（System.in）;
????????new?DynamicPartAllocatePresenter（）.setOnExcuteLisenter（new?OnExecuteLisenter（）?{
????????????@Override
????????????public?Job?getJob（）?{
????????????????//?TODO?Auto-generated?method?stub
????????????????while?（true）?{
????????????????????System.out.print（“請輸入作業（作業號???所用空間大小）>“）;
????????????????????Job?job?=?new?Job（）;
????????????????????int?id?=?scanner.nextInt（）;
????????????????????if?（id?????????????????????????System.out.println（“作業號必須大于0!“）;
????????????????????????continue;
????????????????????}
????????????????????int?length?=?scanner.nextInt（）;
????????????????????job.setJobId（id）;
????????????????????job.setLength（length）;
????????????????????return?job;
????????????????}
????????????}

????????????@Override
????????????public?void?onOutOfMemory（）?{
????????????????//?TODO?Auto-generated?method?stub
????????????????System.out.println（“磁盤空間不足！“）;
????????????}

????????????@Override
????????????public?void?onAllocateSuccess（Partition?partition）?{
????????????????//?TODO?Auto-generated?method?stub
????????????????System.out.println（“----------------------------當前內存情況------------------------------“）;
????????????????System.out.println（
????????????????????????“起始地址???????????????????????終點地址???????????????????????????????內存大小??????????????????????????????????狀態????????????????????????作業號“）;

????????????????for?（PartBlock?block?:?partition.getBlocks（））?{
????????????????????System.out.printf（“%-15d%-15d%-15d%-30s%-15s\n“?block.getStartAddress（）?block.getEndAddress（）
????????????????????????????block.getLength（）?block.getState（）?block.getJobId（）==0?““:String.valueOf（block.getJobId（）））;
????????????????}
????????????????System.out.println（“------------------------------------------------------------------“）;
????????????}

????????????@Override
????????????public?int?getJobId（）?{
????????????????//?TODO?Auto-generated?method?stub
????????????????System.out.print（“請輸入作業id>“）;
????????????????return?scanner.nextInt（）;
????????????}

????????????@Override
????????????public?void?onSearchError（int?id）?{
????????????????//?TODO?Auto-generated?method?stub
????????????????System.out.println（“作業“?+?id?+?“不存在！回收內存失敗！“）;
????????????}

????????????@Override
????????????public?void?onRetrieveSuccess（Partition?partition）?{
????????????????//?TODO?Auto-generated?method?stub
????????????????System.out.println（“----------------------------當前內存情況------------------------------“）;
????????????????System.out.println（
????????????????????????“起始地址???????????????????????終點地址???????????????????????????????內存大小???????????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????301??2018-01-20?14:52??dynamicPartallocate\.classpath

?????文件????????395??2018-01-20?14:52??dynamicPartallocate\.project

?????文件????????598??2018-01-20?14:52??dynamicPartallocate\.settings\org.eclipse.jdt.core.prefs

?????文件???????4363??2018-01-20?14:59??dynamicPartallocate\bin\com\chengshijian\operatesystem\DynamicPartAllocate$1.class

?????文件???????1189??2018-01-20?14:59??dynamicPartallocate\bin\com\chengshijian\operatesystem\DynamicPartAllocate.class

?????文件???????1336??2018-01-20?14:57??dynamicPartallocate\bin\com\chengshijian\operatesystem\DynamicPartAllocatePresenter$1.class

?????文件???????1333??2018-01-20?14:57??dynamicPartallocate\bin\com\chengshijian\operatesystem\DynamicPartAllocatePresenter$2.class

?????文件???????1331??2018-01-20?14:57??dynamicPartallocate\bin\com\chengshijian\operatesystem\DynamicPartAllocatePresenter$3.class

?????文件???????5747??2018-01-20?14:57??dynamicPartallocate\bin\com\chengshijian\operatesystem\DynamicPartAllocatePresenter.class

?????文件????????686??2018-01-20?14:57??dynamicPartallocate\bin\com\chengshijian\operatesystem\Job.class

?????文件????????439??2018-01-20?14:58??dynamicPartallocate\bin\com\chengshijian\operatesystem\OnExecuteLisenter.class

?????文件???????1936??2018-01-20?14:57??dynamicPartallocate\bin\com\chengshijian\operatesystem\PartBlock.class

?????文件???????1528??2018-01-20?14:57??dynamicPartallocate\bin\com\chengshijian\operatesystem\Partition.class

?????文件???????4961??2018-01-20?14:59??dynamicPartallocate\src\com\chengshijian\operatesystem\DynamicPartAllocate.java

?????文件???????9741??2018-01-20?14:57??dynamicPartallocate\src\com\chengshijian\operatesystem\DynamicPartAllocatePresenter.java

?????文件????????492??2018-01-20?14:57??dynamicPartallocate\src\com\chengshijian\operatesystem\Job.java

?????文件????????623??2018-01-20?14:58??dynamicPartallocate\src\com\chengshijian\operatesystem\OnExecuteLisenter.java

?????文件???????1716??2018-01-20?14:57??dynamicPartallocate\src\com\chengshijian\operatesystem\PartBlock.java

?????文件???????1010??2018-01-20?14:57??dynamicPartallocate\src\com\chengshijian\operatesystem\Partition.java

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate\bin\com\chengshijian\operatesystem

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate\src\com\chengshijian\operatesystem

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate\bin\com\chengshijian

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate\src\com\chengshijian

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate\bin\com

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate\src\com

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate\.settings

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate\bin

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate\src

?????目錄??????????0??2018-01-20?14:59??dynamicPartallocate

-----------?---------??----------?-----??----

............此處省略2個文件信息

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