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FIFO£ºÏȽøÏȳöÖû»Ëã·¨¡£¸ÃËã·¨×ÜÊÇÌÔÌ×îÏȽøÈëÄÚ´æµÄÒ³Ã棬¼ÈÑ¡ÔñÔÚÄÚ´æÖÐפÁôʱ¼ä×î¾ÃµÄÒ³ÃæÓèÒÔÌÔÌ¡£
LRU£º×î½ü×î¾ÃδʹÓÃÖû»Ëã·¨¡£¸ÃËã·¨¸³Óèÿ¸öÒ³ÃæÒ»¸ö·ÃÎÊ×ֶΣ¬ÓÃÀ´¼Ç¼һ¸öÒ³Ãæ×ÔÉϴα»·ÃÎÊÒÔÀ´Ëù¾ÀúµÄʱ¼äT£¬µ±ÐëÌÔÌÒ»¸öÒ³Ãæʱ£¬Ñ¡ÔñÏÖÓÐÒ³ÃæÖÐÆäTÖµ×î´óµÄ¸øÓèÌÔÌ¡£
#include
#define Bsize 3
#define Psize 20
struct pageInfor
{
int content;//Ò³ÃæºÅ
int timer;//±»·ÃÎʱê¼Ç
};
class PRA
{
public:
PRA(void);
int findSpace(void);//²éÕÒÊÇ·ñÓпÕÏÐÄÚ´æ
int findExist(int curpage);//²éÕÒÄÚ´æÖÐÊÇ·ñÓиÃÒ³Ãæ
int findReplace(void);//²éÕÒÓ¦ÓèÖû»µÄÒ³Ãæ
void display(void);//ÏÔʾ
void FIFO(void);//FIFOËã·¨
void LRU(void);//LRUËã·¨
void Optimal(void);//OPTIMALËã·¨
void BlockClear(void);//BLOCK»Ö¸´
pageInfor * block;//ÎïÀí¿é
pageInfor * page;//Ò³ÃæºÅ´®
private:
};
PRA::PRA(void)
{
int QString[20]={7,0,1,2,0,3,0,4,2,3,0,3,2,1,2,0,1,7,0,1};
block = new pageInfor[Bsize];
for(int i=0; i
block.content = -1;
block[i].timer = 0;
}
page = new pageInfor[Psize];
for(i=0; i
page[i].content = QString[i];
page[i].timer = 0;
}
}
int PRA::findSpace(void)
{
for(int i=0; i
return i;//ÕÒµ½¿ÕÏÐÄڴ棬·µ»ØBLOCKÖÐλÖÃ
return -1;
}
int PRA::findExist(int curpage)
{
for(int i=0; i
return i;//ÕÒµ½ÄÚ´æÖÐÓиÃÒ³Ã棬·µ»ØBLOCKÖÐλÖÃ
return -1;
}
int PRA::findReplace(void)
{
int pos = 0;
for(int i=0; i
pos = i;//ÕÒµ½Ó¦ÓèÖû»Ò³Ã棬·µ»ØBLOCKÖÐλÖÃ
return pos;
}
void PRA::display(void)
{
for(int i=0; i
cout<
void PRA::Optimal(void)
{
int exist,space,position ;
for(int i=0; i
exist = findExist(i);
if(exist != -1)
{ cout<<"²»È±Ò³"<
{
space = findSpace();
if(space != -1)
{
block[space] = page[i];
display();
}
else
{
for(int k=0; k
if(block[k].content != page[j].content)
{ block[k].timer = 1000; }//½«À´²»»áÓã¬ÉèÖÃTIMERΪһ¸öºÜ´óÊý
else
{
block[k].timer = j;
break;
}
}
position = findReplace();
block[position] = page[i];
display();
}
}
}
}
void PRA::LRU(void)
{
int exist,space,position ;
for(int i=0; i
exist = findExist(i);
if(exist != -1)
{
cout<<"²»È±Ò³"<
}
else
{
space = findSpace();
if(space != -1)
{
block[space] = page[i];
display();
}
else
{
position = findReplace();
block[position] = page[i];
display();
}
}
for(int j=0; j
}
}
void PRA::FIFO(void)
{
int exist,space,position ;
for(int i=0; i
exist = findExist(i);
if(exist != -1)
{cout<<"²»È±Ò³"<
else
{
space = findSpace();
if(space != -1)
{
block[space] = page[i];
display();
}
else
{
position = findReplace();
block[position] = page[i];
display();
}
}
for(int j=0; j
}
}
void PRA::BlockClear(void)
{
for(int i=0; i
block[i].content = -1;
block[i].timer = 0;
}
}
void main(void)
{
cout<<"|----------Ò³ Ãæ ÖÃ »» Ëã ·¨----------|"<
PRA test;
while(select)
{
cin>>select;
switch(select)
{
case 0:
break;
case 1:
cout<<"OptimalËã·¨½á¹ûÈçÏÂ:"<
test.BlockClear();
cout<<"----------------------"<
case 2:
cout<<"FIFOËã·¨½á¹ûÈçÏÂ:"<
test.BlockClear();
cout<<"----------------------"<
case 3:
cout<<"LRUËã·¨½á¹ûÈçÏÂ:"<
test.BlockClear();
cout<<"----------------------"<
default:
cout<<"ÇëÊäÈëÕýÈ·¹¦ÄܺÅ"<
}
}
}
·¢²¼Ê±¼ä£º2005-4-15
[[i] Last edited by frog on 2005-10-23 at 16:17
°®µÄ±ßÔµ ÓÚ 2005-09-01 00:34:14·¢±í:
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ming ÓÚ 2005-08-31 00:31:06·¢±í:
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