用C++编写的虚拟存储器源码

#include<iostream> #include<iomanip> #include<cstring> using namespace std; const int X=7; const int Y=12; int p[4]={0,1,2,3}; int L; char c, q, y; struct pagetable { int pagenum1; //表示页号 int symbol; //表示标志 int blocknum; //表示主存块号 int symbol1; //表示修改标志 int postion; //表示在磁盘中的位置 }; struct sequence { char operation; //表示操作 int pagenum2; //表示页号 int unitnum; //表示单元号 }; class PCB { private: pagetable pagenum1[X]; sequence operation[Y]; public: void deposit1(); //页表的相关信息 void deposit2(); //指令的相关信 void FIFO(); //判断操作 }; void PCB::deposit1() { int i=0; cout<<"输入页表的相关信息:"<<'\n'; for(i=0;i<X;i++) { cin>>pagenum1[i].pagenum1>>pagenum1[i].symbol>>pagenum1[i].blocknum>>pagenum1[i].symbol1 >>pagenum1[i].postion; } if(i>=X) cout<<"*********************************************************"<<endl; } void PCB::deposit2() { int j=0; cout<<"请输入指令序列的相关信息："<<endl; for(j=0;j<Y;j++) { cin>>operation[j].operation>>operation[j].pagenum2>>operation[j].unitnum; } if(j>=Y) cout<<"**********************************************************"<<endl; } void PCB::FIFO() { int k=0; int j; int p[4]={0,1,2,3}; int specificaddress; for(int i=0;i<Y;i++) { L=operation[i].pagenum2; if(pagenum1[operation[i].pagenum2].symbol==1) { specificaddress=specificaddress=pagenum1[operation[i].pagenum2].blocknum*128+operation[i].unitnum; if(operation[i].operation=='c') { pagenum1[L].symbol1=1; cout<<"该指令的绝对地址是"<<specificaddress<<endl; } if(operation[i].operation!='c') { cout<<"该指令的绝对地址是"<<specificaddress<<endl; } } if(pagenum1[operation[i].pagenum2].symbol==0) { cout<<"页"<<L<<"发生缺页中断"<<endl; { j=p[k]; //数组元素赋值给j if(pagenum1[j].symbol1==1) { cout<<"调出页:"<<j<<endl; cout<<"调入第"<<L<<"页"<<endl; if(operation[i].operation=='c') { pagenum1[L].symbol1=1; } pagenum1[L].blocknum=pagenum1[j].blocknum; pagenum1[j].symbol=0; pagenum1[L].symbol=1; p[k]=L; specificaddress=specificaddress=pagenum1[operation[i].pagenum2].blocknum*128+operation[i].unitnum; cout<<"该指令的绝对地址是"<<specificaddress<<endl; } if(pagenum1[j].symbol1==0) { cout<<"调入第"<<L<<"页覆盖第"<<j<<"页"<<endl; if(operation[i].operation=='c') { pagenum1[L].symbol1=1; } pagenum1[L].blocknum=pagenum1[j].blocknum; pagenum1[j].symbol=0; pagenum1[L].symbol=1; p[k]=L; specificaddress=specificaddress=pagenum1[operation[i].pagenum2].blocknum*128+operation[i].unitnum; cout<<"该指令的绝对地址是"<<specificaddress<<endl; } k=(k+1)%4; } } } } void main() { cout<<"请输入页表和指令的相关信息"<<endl; cout<<"C表示操作存"<<'\t'<<"q表示操作取"<<'\t'<<"y表示操作移位"<<endl; PCB memory; memory.deposit1(); memory.deposit2(); memory.FIFO(); }