关于进程调度算法.txt

操作系统的课程设计

#include "stdio.h"

#include <stdlib.h> 

#include <conio.h> 

#define getpch(type) (type*)malloc(sizeof(type)) 

#define NULL 0 

struct pcb { /* 定义进程控制块PCB */ 

char name[10]; 

char state[100];

int waittime;
int xtime; 

int ntime; 

int rtime; 

struct pcb* link; 

}*ready=NULL,*p,*t=NULL;

typedef struct pcb PCB; 

  

  

sort() /* 建立对进程进行优先级排列函数*/ 

{ 

p->link=ready;
ready=p;

}
sort1()
{p->link=t;
ready=p;

}

input() /* 建立进程控制块函数*/ 

{ 

int i,num; 

clrscr(); /*清屏*/ 

printf("\n 请输入进程号:"); 

scanf("%d",&num); 

for(i=0;i<num;i++) 

{ 

printf("\n 进程号No.%d:\n",i); 

p=getpch(PCB); 

printf("\n 输入进程名:"); 

scanf("%s",p->name); 

printf("\n阻塞进程的时间片 :");

scanf("%d",&p->waittime); 

printf("\n 进程要运行的时间：");

scanf("%d",&p->ntime); 
printf("\n阻塞时间：");
scanf("%d",&p->xtime);

printf("\n"); 

p->rtime=0;

p->link=NULL; 

sort(); /* 调用sort函数*/ 

} 

} 

int space() 

{ 

int l=0; PCB* pr=ready; 

while(pr!=NULL) 

{ 

l++; 

pr=pr->link; 

} 

return(l); 

} 

disp(PCB * pr) /*建立进程显示函数,用于显示当前进程*/ 

{ 

printf("\n qname \t state \t waittime \t ndtime \t runtime \t xtime\n"); 

printf("|%s\t",pr->name); 

printf("|%c\t",pr->state); 

printf("|%d\t",pr->waittime);

printf("|%d\t",pr->xtime);  

printf("|%d\t",pr->ntime); 

printf("|%d\t",pr->rtime); 

printf("\n"); 

} 

check() /* 建立进程查看函数 */ 

{ 

PCB* pr; 
PCB* pp;

printf("\n当前正在运行的进程是:%s",p->name); /*显示当前运行进程*/ 

disp(p); 

pr=ready; 

printf("\n当前就绪队列状态为:\n"); /*显示就绪队列状态*/ 

while(pr!=NULL) 

{ 

disp(pr); 

pr=pr->link; 

} 
pp=t;

printf("\n阻塞队列状态为:\n");

while(pp!=NULL)

{
disp(pp);

pp=pp->link;
}

} 

destroy() /*建立进程撤消函数(进程运行结束,撤消进程)*/ 

{ 

printf("\n 进程 [%s] 已完成.\n",p->name); 

free(p); 

} 

running() /* 建立进程就绪函数(进程运行时间到,置就绪状态*/ 

{PCB *ptr;
while(p->rtime!=p->ntime)
{p->rtime++;
printf("\n当前所运行的进程状态为:");
disp(p);
ptr=t;
while(ptr!=NULL)
{ptr->xtime--;
if(ptr->xtime==0)
{p=ptr;
sort();
} ptr->link=ptr;
} if(p->rtime==p->waittime)

{ printf("\n该进程被阻塞:");

sort1();

break;}
}

if(p->rtime==p->ntime)
destroy();

} 

main() /*主函数*/ 

{ 

int len,h=0; 

input(); 

len=space(); 
printf("%d",len);

while((ready!=NULL))

{ 

h++; 

printf("\n The execute number:%d \n",h); 

p=ready; 

ready=p->link;

check();

running(); 

printf("\n 按任一键继续......"); 

}

printf("\n\n 进程已经完成.\n"); 

}