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README
Apache-2.0

操作系统原理

Language Version Author 友情链接

主页

https://gitee.com/JJJZZZYYY/operating-system-principle

简介

本项目基于C/C++,旨在模拟操作系统中处理机调度、存储管理(动态分区分配、分页存储地址转换)和文件系统的执行流程,通过基础逻辑代码的形式展现操作系统底层如何流转。

相关流转逻辑可采用但不仅限于此类算法:最佳(Optimal)置换算法,先进先出(FIFO)页面置换算法,LRU(Least Recently Used)置换算法,Clock置换算法,页面缓冲算法(Page Buffering Algorithm,PBA)。

总览

处理机调度模拟

  • 核心代码(结构体定义)

    typedef struct pcb {
    //  进程id
    int id;
    //  到达时间
    int arrivedTime;
    //  运行所需要的时间
    int needTime;
    //  已使用的时间
    int usedTime;
    //  三种状态:wait、run、finish
    char state[6];
    }pcb, *PCB;
    
    typedef struct PCBNode {
    PCB pcb;
    //	上一个PCB
    PCBNode *before;
    //  下一个PCB
    PCBNode *next;
    }PCBNode, *PCBList;
  • 运行截图

    处理机调度模拟

存储管理模拟

动态分区分配

  • 核心代码(结构体定义)

    typedef struct memoryNode {
        string name;
        int address;
        int length;
        memoryNode *next;
    }memoryNode, *MemoryNode;
  • 运行截图

    存储管理模拟(动态分区分配)

分页存储地址转换

  • 核心代码(结构体定义)

    typedef struct {
    	// 块号
    	int blockNumber;
    	// 状态位(存在位)
    	int P;
    }PageTableItem, *PageTableItemArray;
    
    typedef struct PageTable{
    	PageTableItemArray *pageTableItemArray;
    	int length;
    }PageTable;
    
    typedef struct quickPageTableNode{
    	int pageNumber;
    	int blockNumber;
    	quickPageTableNode *next;
    }quickPageTableNode, *QuickPageTableNode;
    
    typedef struct QuickPageTable{
    	int length;
    	QuickPageTableNode quickPageTableNode;
    }QuickPageTable;
    
    typedef struct stackNode{
    	stackNode *before;
    	int pageNumber;
    	stackNode *next;
    }stackNode, *StackNode;
    
    typedef struct StackList{
    	int length;
    	StackNode stackNode;
    }StackList;
  • 流程图

    存储管理模拟(分页存储地址转换)流程图

  • 运行截图

    存储管理模拟(分页存储地址转换)

文件系统模拟

  • 核心代码(结构体定义)

    typedef struct fileContent {
    	// 实际文件内容 
    	string Content;
    } *FileContent;
    
    typedef struct file {
    	// 文件名
    	string fileName;
    	// 文件类型
    	string fileType;
    	// 文件大小 
    	int fileSize;
    	// 文件内容指针 
    	FileContent fileContent;
    	// 文件保护码(index = 0:读权限,index = 1:读权限,index = 2:执行权限;权限位含义:0为禁止,1为允许) 
    	char fileProtectCode[3];
    	// 创建时间
    	time_t createTime;
    	// 修改时间 
    	time_t updateTime;
    	// 访问时间 
    	time_t accessTime;
    } *File;
    
    // 二级目录:用户文件目录(每个用户的独立文件目录) 
    typedef struct uFD {
    	// 当前文件
    	File file;
    	// 上一个文件指针 
    	uFD *before;
    	// 下一个文件指针 
    	uFD *next;
    } *UFD;
    
    typedef struct user {
    	// 用户名 
    	string username;
    	// 密码 
    	string password;
    	// 用户目录指针 
    	UFD ufd;
    } *User;
    
    // 一级目录:主文件目录(所有用户和对应用户的相关信息) 
    typedef struct mFD {
    	// 当前用户
    	User user;
    	// 上一个用户指针
    	mFD *before;
    	// 下一个用户指针 
    	mFD *next;
    } *MFD;
    
    // 打开文件目录(运行文件目录) 
    typedef struct aFD {
    	// 当前文件
    	File file;
    	// 上一个文件指针 
    	aFD *before;
    	// 下一个文件指针 
    	aFD *next;
    } *AFD;
  • 运行截图

    文件系统模拟

安装使用教程

  1. 拥有符合C/C++编译运行的环境和对应的编译器 (不局限于某一种编译器,能编译运行C/C++均可)
  2. 直接用编译器打开对应模块的.cpp文件,编译运行
  3. 根据程序给出的用户提示操作或者在对应文件夹下有Tip.txt文件,输入其内部提供的测试用例直接运行即可
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简介

基于C/C++模拟处理机调度、存储管理(动态分区分配、分页存储地址转换)和文件系统 展开 收起
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