C語(yǔ)言課程設計_進(jìn)程調度(2006-6-19 12:55:00)
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#include "stdio.h"
#include "stdlib.h"
#include "string.h"
typedef struct node
{
char name[10]; /*進(jìn)程標識符*/
int prio; /*進(jìn)程優(yōu)先數*/
int round; /*進(jìn)程時(shí)間輪轉時(shí)間片*/
int cputime; /*進(jìn)程占用CPU時(shí)間*/
int needtime; /*進(jìn)程到完成還要的時(shí)間*/
int count; /*計數器*/
char state; /*進(jìn)程的狀態(tài)*/
struct node *next; /*鏈指針*/
}PCB;
PCB *finish,*ready,*tail,*run; /*隊列指針*/
int N; /*進(jìn)程數*/
/*將就緒隊列中的第一個(gè)進(jìn)程投入運行*/
firstin()
{
run=ready; /*就緒隊列頭指針賦值給運行頭指針*/
run->state='R'; /*進(jìn)程狀態(tài)變?yōu)檫\行態(tài)*/
ready=ready->next; /*就緒對列頭指針后移到下一進(jìn)程*/
}
/*標題輸出函數*/
void prt1(char a)
{
if(toupper(a)=='P') /*優(yōu)先數法*/
printf(" name cputime needtime priority state\n");
else
printf(" name cputime needtime count round state\n");
}
/*進(jìn)程PCB輸出*/
void prt2(char a,PCB *q)
{
if(toupper(a)=='P') /*優(yōu)先數法的輸出*/
printf(" %-10s%-10d%-10d%-10d %c\n",q->name,
q->cputime,q->needtime,q->prio,q->state);
else/*輪轉法的輸出*/
printf(" %-10s%-10d%-10d%-10d%-10d %-c\n",q->name,
q->cputime,q->needtime,q->count,q->round,q->state);
}
/*輸出函數*/
void prt(char algo)
{
PCB *p;
prt1(algo); /*輸出標題*/
if(run!=NULL) /*如果運行指針不空*/
prt2(algo,run); /*輸出當前正在運行的PCB*/
p=ready; /*輸出就緒隊列PCB*/
while(p!=NULL)
{
prt2(algo,p);
p=p->next;
}
p=finish; /*輸出完成隊列的PCB*/
while(p!=NULL)
{
prt2(algo,p);
p=p->next;
}
getch(); /*壓任意鍵繼續*/
}
/*優(yōu)先數的插入算法*/
insert1(PCB *q)
{
PCB *p1,*s,*r;
int b;
s=q; /*待插入的PCB指針*/
p1=ready; /*就緒隊列頭指針*/
r=p1; /*r做p1的前驅指針*/
b=1;
while((p1!=NULL)&&b) /*根據優(yōu)先數確定插入位置*/
if(p1->prio>=s->prio)
{
r=p1;
p1=p1->next;
}
else
b=0;
if(r!=p1) /*如果條件成立說(shuō)明插入在r與p1之間*/
{
r->next=s;
s->next=p1;
}
else
{
s->next=p1; /*否則插入在就緒隊列的頭*/
ready=s;
}
}
/*輪轉法插入函數*/
insert2(PCB *p2)
{
tail->next=p2; /*將新的PCB插入在當前就緒隊列的尾*/
tail=p2;
p2->next=NULL;
}
/*優(yōu)先數創(chuàng )建初始PCB信息*/
void create1(char alg)
{
PCB *p;
int i,time;
char na[10];
ready=NULL; /*就緒隊列頭指針*/
finish=NULL; /*完成隊列頭指針*/
run=NULL; /*運行隊列指針*/
printf("Enter name and time of process\n"); /*輸入進(jìn)程標識和所需時(shí)間創(chuàng )建PCB*/
for(i=1;i<=N;i++)
{
p=malloc(sizeof(PCB));
scanf("%s",na);
scanf("%d",&time);
strcpy(p->name,na);
p->cputime=0;
p->needtime=time;
p->state='w';
p->prio=50-time;
if(ready!=NULL) /*就緒隊列不空調用插入函數插入*/
insert1(p);
else
{
p->next=ready; /*創(chuàng )建就緒隊列的第一個(gè)PCB*/
ready=p;
}
}
clrscr();
printf(" output of priority:\n");
printf("************************************************\n");
prt(alg); /*輸出進(jìn)程PCB信息*/
run=ready; /*將就緒隊列的第一個(gè)進(jìn)程投入運行*/
ready=ready->next;
run->state='R';
}
/*輪轉法創(chuàng )建進(jìn)程PCB*/
void create2(char alg)
{
PCB *p;
int i,time;
char na[10];
ready=NULL;
finish=NULL;
run=NULL;
printf("Enter name and time of round process\n");
for(i=1;i<=N;i++)
{
p=malloc(sizeof(PCB));
scanf("%s",na);
scanf("%d",&time);
strcpy(p->name,na);
p->cputime=0;
p->needtime=time;
p->count=0; /*計數器*/
p->state='w';
p->round=2; /*時(shí)間片*/
if(ready!=NULL)
insert2(p);
else
{
p->next=ready;
ready=p;
tail=p;
}
}
clrscr();
printf(" output of round\n");
printf("************************************************\n");
prt(alg); /*輸出進(jìn)程PCB信息*/
run=ready; /*將就緒隊列的第一個(gè)進(jìn)程投入運行*/
ready=ready->next;
run->state='R';
}
/*優(yōu)先數調度算法*/
priority(char alg)
{
while(run!=NULL) /*當運行隊列不空時(shí)，有進(jìn)程正在運行*/
{
run->cputime=run->cputime+1;
run->needtime=run->needtime-1;
run->prio=run->prio-3; /*每運行一次優(yōu)先數降低3個(gè)單位*/
if(run->needtime==0) /*如所需時(shí)間為0將其插入完成隊列*/
{
run->next=finish;
finish=run;
run->state='F'; /*置狀態(tài)為完成態(tài)*/
run=NULL; /*運行隊列頭指針為空*/
if(ready!=NULL) /*如就緒隊列不空*/
firstin(); /*將就緒對列的第一個(gè)進(jìn)程投入運行*/
}
else /*沒(méi)有運行完同時(shí)優(yōu)先數不是最大，則將其變?yōu)榫途w態(tài)插入到就緒隊列*/
if((ready!=NULL)&&(run->prio<ready->prio))
{
run->state='W';
insert1(run);
firstin(); /*將就緒隊列的第一個(gè)進(jìn)程投入運行*/
}
prt(alg); /*輸出進(jìn)程PCB信息*/
}
}
/*時(shí)間片輪轉法*/
roundrun(char alg)
{
while(run!=NULL)
{
run->cputime=run->cputime+1;
run->needtime=run->needtime-1;
run->count=run->count+1;
if(run->needtime==0)/*運行完將其變?yōu)橥瓿蓱B(tài)，插入完成隊列*/
{
run->next=finish;
finish=run;
run->state='F';
run=NULL;
if(ready!=NULL)
firstin(); /*就緒對列不空，將第一個(gè)進(jìn)程投入運行*/
}
else
if(run->count==run->round) /*如果時(shí)間片到*/
{
run->count=0; /*計數器置0*/
if(ready!=NULL) /*如就緒隊列不空*/
{
run->state='W'; /*將進(jìn)程插入到就緒隊列中等待輪轉*/
insert2(run);
firstin(); /*將就緒對列的第一個(gè)進(jìn)程投入運行*/
}
}
prt(alg); /*輸出進(jìn)程信息*/
}
}
/*主函數*/
main()
{
char algo; /*算法標記*/
clrscr();
printf("type the algorithm:P/R(priority/roundrobin)\n");
scanf("%c",&algo); /*輸入字符確定算法*/
printf("Enter process number\n");
scanf("%d",&N); /*輸入進(jìn)程數*/
if(algo=='P'||algo=='p')
{
create1(algo); /*優(yōu)先數法*/
priority(algo);
}
else
if(algo=='R'||algo=='r')
{
create2(algo); /*輪轉法*/
roundrun(algo);
}
}
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