paging.cpp.cpp

Memory Management Simulator...........

#include <conio.h>
#include <process.H>
#include<iostream.h>
enum yesno{yes, no};
struct fdata{
	yesno free;
	long size;
	int id;
	long jsize;
	int jid;
	int pno;
	fdata(){
	size=id=jsize=jid=0;
	free=yes;}
	};
/////////////////////////////////////////////////////////////////////////////
class paging{
	private:
		int noofframes;
		long tram;
		int fsize;
		fdata * frames;
	public:
		paging (){
		cout<<"enter total ram";
		cin>>tram;
		cout<<"enter size of Region";
		cin>>fsize;
		noofframes=tram/fsize;
		frames = new fdata[noofframes];
			}

		~paging(){ delete frames;}
		void getframes();
		void showframes();
		void createjob();
		void deletejob();
		void sortframes();
	};
//////////////////////////////////////////////////////////////////////////////

void paging::getframes()
	{
	for(int i=0;i<noofframes;i++)
		{
		frames[i].size=fsize;
		frames[i].id=i;
		}
	}
//////////////////////////////////////////////////////////////////////////////
void paging::showframes()
	{
	for(int i=0;i<noofframes;i++)
		{
		cout<<"\n\n\tFrame   "<<frames[i].id<<"  size: " ;
		cout<<frames[i].size;
		if(frames[i].free==no)
			cout<<"\t Contains Job " <<frames[i].jid<<" Page no: "<<frames[i].pno;
		else
			cout<<" \tIs Free";
		}
	}
/////////////////////////////////////////////////////////////////////////////

void paging::createjob(){
	int jid; long jsize;
	cout<<"Enter Job Id :";
	cin>>jid;
	cout<<"Enter Job Size : ";
	cin>>jsize;  int a=0;
	int job=jsize;
	while(job>0)
	{
	for(int i=0;i<noofframes;i++)
		{
		if(frames[i].free==yes)
			{
			frames[i].jid=jid;
			frames[i].jsize=jsize;
			frames[i].free=no;
			frames[i].pno=a;

			break;
			}

		}
		job=job-fsize;
		a++;
       }

}
//////////////////////////////////////////////////////////////////////////////
void paging::deletejob(){
	int jid;
	cout<<"Enter job Id";
	cin>>jid; int y=0;
	for( int i=0; i<noofframes;i++)
		{
		if (jid==frames[i].jid)
			{
			frames[i].jid=0;
			frames[i].jsize=0;
			frames[i].free=yes;
			y=1;
			}
		}
       if(y==0)
		cout<<"\n\n\n\n\nNo Such Job Exist";
}
/////////////////////////////////////////////////////////////////////////////

void main(){
	clrscr();
	paging b1;
	b1.getframes();
	clrscr();
	char ch;
	while(ch!='4')
		{
		cout<<"\n\n\n\t\tBESTFIT MENU ";
		cout<<"\n\n\t\t1....... Create Job";
		cout<<"\n\n\t\t2....... Terminate Job";
		cout<<"\n\n\t\t3....... Status";
		cout<<"\n\n\t\t4....... Exit";
		cout<<"\n\n\n\n Enter Your choice ;";
		cin>>ch;  clrscr();
		switch(ch){
			case '1':
				b1.createjob();
				break;
			case '2':
				b1.deletejob();
				break;
			case'3':
				b1.showframes();
				break;
			}
		getch();
		clrscr();
		}
	getch();
	}
/////////////////////////////////////////////////////////////////////////////