yemiandlg.cpp

操作系统中的页面置换算法 包含 opt fifo lru

// yemianDlg.cpp : implementation file
//

#include "stdafx.h"
#include "yemian.h"
#include "yemianDlg.h"
#include <afxtempl.h>
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CYemianDlg dialog

CYemianDlg::CYemianDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CYemianDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CYemianDlg)
	m_memory = 0;
	m_total = 0;
	m_random = _T("");
	m_change = 0;
	m_absent = 0;
	m_changef = 0.0;
	m_absentf = 0.0;
	//}}AFX_DATA_INIT
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CYemianDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CYemianDlg)
	DDX_Control(pDX, IDC_LIST1, m_list);
	DDX_Text(pDX, IDC_EDIT1, m_memory);
	DDX_Text(pDX, IDC_EDIT2, m_total);
	DDX_Text(pDX, IDC_EDIT3, m_random);
	DDX_Text(pDX, IDC_EDIT4, m_change);
	DDX_Text(pDX, IDC_EDIT6, m_absent);
	DDX_Text(pDX, IDC_EDIT5, m_changef);
	DDX_Text(pDX, IDC_EDIT7, m_absentf);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CYemianDlg, CDialog)
	//{{AFX_MSG_MAP(CYemianDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnFIFO)
	ON_BN_CLICKED(IDC_BUTTON2, OnLRU)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CYemianDlg message handlers

BOOL CYemianDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CYemianDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CYemianDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

HCURSOR CYemianDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}




//先进先出页面置换算法
void CYemianDlg::OnFIFO() 
{
	UpdateData(1);
	CArray<int,int> myt;//存放随机生成的所有页面号的数组
	CArray<int,int> mym;//存放物理块中现有的页面号
	int m=0;
	int	as=0;//置换页面计数
	bool x;  //页面是否需要置换
	CString str1="";
	CString str2="";
	myt.SetSize(m_total,-1);
	mym.SetSize(m_memory,-1);
	if(m_memory<m_total)
	{ 
		m_list.ResetContent();
		m_random="";
		//srand((unsigned int)1);

		for(int i=0;i<m_total;i++)
		{
			
			myt.SetAt(i,rand()%m_total+1);
			str2.Format("%d",myt.GetAt(i));
			str1=str1+" "+str2;//MessageBox(str1);
		}
		m_random=str1;
		UpdateData(0);
		
		for(i=0;i<m_total;i++)
		{ 
			str1="";
			str2="";
			x=true;
	
			  for(int k=0;k<m_memory;k++)
			  {
				  if(myt.GetAt(i)==mym.GetAt(k))
				  {
					  x=false;//判断物理块中是不是有跟当前须替换的页面
					  break;
				  }
			  }
		      if(x)//||i<m_memory
			  {			   	  
				int a;
				a=(i-m)%m_memory;
			    mym.SetAt(a,myt.GetAt(i));
				as++;
			  }
			  else 
			  {
				m++;
			  }
			  int b;
			  for(int j=0;j<m_memory;j++) 
			  {
			  b=mym.GetAt(j);
			  str2.Format("%d",b);
			  str1=str1+" "+str2;
			}
		    m_list.InsertString(-1,str1);
		}
		m_absent=as;
		m_absentf=(double)as/m_total;
		if((as-m_memory)<=0)
		{
			m_change=0;
			m_changef=0;
		}
		else
		{
			m_change=as-m_memory;
			m_changef=(double)(as-m_memory)/m_total;
		}
		UpdateData(0);
	}
	else
		MessageBox("页面总数小于物理块，不需要进行交换操作！");

}
	

//最久未使用页面置换算法
void CYemianDlg::OnLRU() 
{
	UpdateData(1);
	CArray<int,int> myt;
	CArray<int,int> mym;
	CArray<int,int> myb;
	int m=0,a;
	int as=0;  //置换页面计数
	bool x;	
	CString str1="";
	CString str2="";
	myt.SetSize(m_total,-1);
	mym.SetSize(m_memory,-1);
	myb.SetSize(m_memory,-1);
	if(m_memory<m_total)
	{ 
		m_list.ResetContent();
		m_random="";
		//生成随机页面数组队列
		for(int i=0;i<m_total;i++)
		{
			myt.SetAt(i,rand()%m_total+1);//i);
			str2.Format("%d",myt.GetAt(i));
			str1=str1+" "+str2;//转化为字符串数组，便于输出	
		}
		m_random=str1;
		UpdateData(0);		
		for(i=0;i<m_total;i++)
		{ 
			str1="";
			str2="";
			x=true;
	        for(int k=0;k<m_memory;k++)
			  {
				  if(myt.GetAt(i)==mym.GetAt(k))//判断物理块中的页面是否与当前页面相等
				  {
					  myb.SetAt(k,0);
					  for(int j=0;j<m_memory;j++)
						{
							if(j!=k)
							myb.SetAt(j,myb.GetAt(j)+1);//使物理块中的每个未使用页面的时间增一
						}
					  x=false;//判断物理块中是不是有跟当前须替换的页面
					  m++;		  
					  break;
				  }
			  }
		      if(x) 
			  {			   	  
				int c=0,d;	
				if((i-m)<m_memory)
				{
					a=i-m;   
				}  //当前物理页面未填满时直接装入
				else 
				{
					d=myb.GetAt(0);
					for(int h=0;h<m_memory;h++)
					{
						if(d<myb.GetAt(h))
						{
							d=myb.GetAt(h);
							c=h;
						}
					}
					a=c; //找出物理块中最久未使用的页面号
				}
			    mym.SetAt(a,myt.GetAt(i));//将其替换
				myb.SetAt(a,0);
				for(k=0;k<m_memory;k++)
				{
					if(k!=a)
						myb.SetAt(k,myb.GetAt(k)+1);//使物理块中的每个未改变页面的时间增一
				}
				myb.SetAt(a,0);
				as++;
			  }
			  for(int j=0;j<m_memory;j++) 
			  {
				  
				  int b;
				  b=mym.GetAt(j);
				  str2.Format("%d",b);
				  str1=str1+" "+str2;
			  }
		    m_list.InsertString(-1,str1);
		}
		m_absent=as;
		m_absentf=(double)as/m_total;
		m_change=as-m_memory;
		m_changef=(double)(as-m_memory)/m_total;
		UpdateData(0);
	}
	else
		MessageBox("页面总数小于物理块，不需要进行交换操作！");

}