函数.txt

模拟操作系统的多级反馈轮转操作系统课程必需

#include<iostream.h>
float t1=1.5;
float t2=3;
float t3=4.5;

 
struct Pro
{
 char name[10];//进程名
float reach;//进程到达时间
 float time;//进程运行需要的时间
int priority;// 数字越小优先级越高
 Pro *next;
};

typedef Pro * tab;

 struct PCB
{char name[10];//进程名
float reach;//进程到达时间
 float time;//进程运行需要的时间
int priority;// 数字越小优先级越高
float rest;//进程执行剩余时间
float start;//进程执行开始时间
float end;//进程执行结束时间
float pause;//进程中途停止时间
int n;//进程执行次数

PCB *next;
};
typedef PCB* pcb;


void inist_table(tab &l)
{int n;
Pro *p;
Pro *q;
l=new Pro;
q=l;
cout<<"请输入进程个数"<<endl;
cin>>n;
for(int i=1;i<=n;i++)
{p=new Pro;
cout<<"请输入进程名"<<endl;
cin>>p->name;
cout<<"请输入进程到达时间"<<endl;
cin>>p->reach;
cout<<"请输入进程执行所需时间"<<endl;
cin>>p->time;
cout<<"请输入进程优先级"<<endl;
cin>>p->priority;
q->next=p;
q=p;  
  }
q->next=NULL;
}

void insert_PCB(Pro *q,pcb &l11,pcb &l22,pcb &l33)//插入新节点
{pcb p;
if(q->priority==1)
 {p=l11;
  l11=new PCB;
  char *x;
  char *y;
  x=l11->name;
  y=q->name;
   while(*y!='\0')
   {(*x)=(*y);
    x++;
	y++;}
    (*x)=(*y);
  l11->reach=q->reach;
  l11->time=q->time;
  l11->rest=q->time;
  l11->priority=q->priority;
   l11->n=0;
    p->next=l11;
    l11->next=NULL;
}
  
   if(q->priority==2)
 {p=l22;
  l22=new PCB;
  char *x;
  char *y;
  x=l22->name;
  y=q->name;
   while(*y!='\0')
   {(*x)=(*y);
    x++;
	y++;}
   (*x)=(*y);
  l22->reach=q->reach;
  l22->time=q->time;
  l22->rest=q->time;
  l22->priority=q->priority;
   l22->n=0;
    p->next=l22;
    l22->next=NULL;
 }

 if(q->priority==3)
 {p=l33;
  l33=new PCB;
  char *x;
  char *y;
  x=l33->name;
  y=q->name;
   while(*y!='\0')
   {(*x)=(*y);
    x++;
	y++;}
(*x)=(*y);
  l33->reach=q->reach;
  l33->time=q->time;
  l33->rest=q->time;
  l33->priority=q->priority;
   l33->n=0;
    p->next=l33;
    l33->next=NULL;
}
 

}



void add(pcb L, pcb &l1,pcb &l11,pcb &l2,pcb &l22,pcb &l3,pcb &l33)
{ switch(L->priority) 
{case 1:
 if(L->next)
 {l1->next=L->next;
  l22->next=L;
  l22=L;
  l22->priority=2;
  l22->next=NULL;}
 else{ l1->next=NULL;l11=l1;
  l22->next=L;
  l22=L;
  l22->priority=2;
  l22->next=NULL;}
 
 
 break;
   case 2:
   if(L->next)
 {l2->next=L->next;
  l33->next=L;
  l33=L;
  l33->priority=3;
  l33->next=NULL;}
 else{ l2->next=NULL;l22=l1;
  l33->next=L;
  l33=L;
  l33->priority=3;
  l33->next=NULL;}
 

 break;
case 3:
 if(L->next)
 {l3->next=L->next;
  l33->next=L;
  l33=L;
  l33->priority=3;
  l33->next=NULL;}
 
 break;
} 

}

void add1(PCB *L,pcb &l1,pcb &l11,pcb &l2,pcb &l22,pcb  &l3,pcb &l33,pcb &l44)
{if(L->priority==1){l1->next=L->next;if(!L->next)l11=l1;}
 if(L->priority==2){l2->next=L->next;if(!L->next)l22=l2;}
 if(L->priority==3){l3->next=L->next;if(!L->next)l33=l3;}
  l44->next=L;
  l44=L;
  l44->next=NULL;
  }





void did(Pro *l)
{
	float now=0;//当前时间
pcb L1,L11,L2,L22,L3,L33;//分别指向每个队列的第一个节点和最后一个节点
 pcb L4,L44;//指向执行完的的队列的第一个节点和最后个节点
 pcb p;//指向当前操作的节点
 Pro *q;
 q=l->next;
 L1=new PCB;
 L1->next=NULL;
 L11=L1;
 L2=new PCB;
 L2->next=NULL;
 L22=L2;
 L3=new PCB;
 L3->next=NULL;
 L33=L3;
 L4=new PCB;
  L4->next=NULL;
 L44=L4;
 insert_PCB(q,L11,L22,L33);
 q=q->next;
char *kk;
loop1:
p=L1->next;

if(p!=NULL)
{ 
  
 
  p->rest=p->rest-t1;
  p->n++;
  kk=p->name;
  while(*kk!='\0')
  {cout<<(*kk);
  kk++;}
  cout<<endl;
    
  if(p->n==1)p->start=now;
  if(p->rest==0){now=now+t1;p->end=now;}
  if(p->rest<0){now=now+p->rest+t1;p->end=now;}
  if(p->rest>0){now=now+t1;p->pause=now;}
   
  while(q)
  {if(q->reach<=now)
  {
  insert_PCB(q,L11,L22,L33);
   q=q->next;}
    else break;
  }
   
   if(p->rest>0)add(p,L1,L11,L2,L22,L3,L33);
    else add1(p,L1,L11,L2,L22,L3,L33,L44);
 
goto loop1;

}




p=L2->next;
if(p!=NULL)
{ 
  
 
  p->rest=p->rest-t2;
  p->n++;

  kk=p->name;
  while(*kk!='\0')
  {cout<<(*kk);
  kk++;}
  cout<<endl;
    
    
  if(p->n==1)p->start=now;
  if(p->rest==0){now=now+t2;p->end=now;}
  if(p->rest<0){now=now+p->rest+t2;p->end=now;}
  if(p->rest>0){now=now+t2;p->pause=now;}
   
  while(q)
  {if(q->reach<=now)
  {
  insert_PCB(q,L11,L22,L33);
   q=q->next;}
    else break;
  }
 
   if(p->rest>0)add(p,L1,L11,L2,L22,L3,L33);
    else add1(p,L1,L11,L2,L22,L3,L33,L44);
 

goto loop1;

}


p=L3->next;
if(p!=NULL)
{ 
  
 
  p->rest=p->rest-t3;
  p->n++;
kk=p->name;
  while(*kk!='\0')
  {cout<<(*kk);
  kk++;}
  cout<<endl;
    
  if(p->n==1)p->start=now;
  if(p->rest==0){now=now+t3;p->end=now;}
  if(p->rest<0){now=now+p->rest+t3;p->end=now;}
  if(p->rest>0){now=now+t3;p->pause=now;}
   
  while(q)
  {if(q->reach<=now)
  {
  insert_PCB(q,L11,L22,L33);
   q=q->next;}
    else break;
  }
   
   if(p->rest>0)add(p,L1,L11,L2,L22,L3,L33);
    else add1(p,L1,L11,L2,L22,L3,L33,L44);


goto loop1;

}
float k=0;
int c=0;
p=L4->next;
while(p)
{float m;
 m=p->end-p->start;
 k=k+m;
 p=p->next;c++;}
 k=k/c;
 cout<<k<<endl;


}