jobwork.cpp

操作系统的作业调度

#include<stdio.h>

#include <stdlib.h>
#include <string.h>
#define getjcb(type) (type*)malloc(sizeof(type))
#define NULL 0

int n=0,time=0;float eti,ewi;

struct jcb{ char name[10];           /* 作业名 */
            char state;              /* 作业状态 */
            int ts;                  /* 提交时间 */
            float super;               /* 优先权 */
            int tb;                  /* 开始运行时间 */
            int tc;                  /* 完成时间 */
            float ti;                /* 周转时间 */
            float wi;                /* 带权周转时间 */
            int ntime;               /* 作业所需运行时间 */
            char resource[10];       /* 所需资源 */
            struct jcb *link;        /* 结构体指针 */
        } *p,*q,*head=NULL;
typedef struct jcb JCB;

void inital(){
int i;
printf("\n输入作业数：\n");
scanf("%d",&n);

printf("Input\nname\tts\tntime\tresource\n");

for(i=0;i<n;i++){
        p=getjcb(JCB);
        scanf("%s\t%d\t%d\t%s",&p->name,&p->ts,&p->ntime,&p->resource);
        p->state='W';
        p->link=NULL;
        if(head==NULL)  head=q=p;
        else{
            q->link=p;
            q=p;
            }
    }
}

void fileinput(){
FILE *fp;
int i;
if((fp=fopen("os2.txt","r"))==NULL) printf(" 打开出错!") ;
    fscanf(fp,"%d\n",&n);

for(i=0;i<n;i++){
    p=getjcb(JCB);
    fscanf(fp,"%s%d%d%s",&p->name,&p->ts,&p->ntime,&p->resource);

        p->state='W';
        p->link=NULL;
        if(head==NULL)  head=q=p;
        else{
            q->link=p;
            q=p;
            }
}
   fclose(fp);
}



void print(JCB *pr,int m){
JCB *p;
    printf("\ntime=%d",time);
    if(m==3){
        printf("\nname\tstate\tts\tntime\tsuper\tsource\ttb\ttc\tti\twi\n");

        printf("%s\t%c\t%d\t%d\t%4.2f\t%s\t%d\t%d\t%4.2f\t%4.2f\n",
        pr->name,pr->state,pr->ts,pr->ntime,pr->super,pr->resource,pr->tb,pr->tc,pr->ti,pr->wi);
    }
    else {
        printf("\nname\tstate\tts\tntime\tsuper\tsource\ttb\ttc\tti\twi\n");

        printf("%s\t%c\t%d\t%d\t%s\t%d\t%d\t%4.2f\t%4.2f\n",
        pr->name,pr->state,pr->ts,pr->ntime,pr->resource,pr->tb,pr->tc,pr->ti,pr->wi);
    }
    p=head;
    do{
            if(p->state=='W')
                if(m==3){
                    printf("%s\t%c\t%d\t%d\t%4.2f\t%s\n",
                    p->name,p->state,p->ts,p->ntime,p->super,p->resource);
                }
                else{
                    printf("%s\t%c\t%d\t%d\t%s\n",
                    p->name,p->state,p->ts,p->ntime,p->resource);
                }
            p=p->link;
        }while(p!=NULL);
    p=head;
    do{
            if(p->state=='F')
                if(m==3){
                    printf("%s\t%c\t%d\t%d\t%4.2f\t%s\t%d\t%d\t%4.2f\t%4.2f\n",
                    p->name,p->state,p->ts,p->ntime,p->super,p->resource,p->tb,p->tc,p->ti,p->wi);
                }
                else{
                    printf("%s\t%c\t%d\t%d\t%s\t%d\t%d\t%4.2f\t%4.2f\n",
                    p->name,p->state,p->ts,p->ntime,p->resource,p->tb,p->tc,p->ti,p->wi);
                }
                p=p->link;
    }while(p!=NULL);
}

void last(){
    eti/=n;ewi/=n;
    printf("\neti=%7.3f\tewi=%7.3f\n",eti,ewi);
}

void super(){
JCB *padv;
padv=head;

do{
    if(padv->state=='W'&&padv->ts<=time)
    padv->super=(float)(time-padv->ts+padv->ntime)/padv->ntime;
    padv=padv->link;
}while(padv!=NULL);

}

void running(JCB *p,int m){
            p->tb=time;p->state='R';
            p->tc=p->tb+p->ntime;
            p->ti=(float)(p->tc-p->ts);
            p->wi=(float)(p->ti/p->ntime);
            eti+=p->ti;
            ewi+=p->wi;
            print(p,m);
            time+=p->ntime;
            p->state='F';
            printf("\n%s 已经完成!\n 按下键盘继续...\n",p->name);
            getchar();
 
}
void hrn(int m){
JCB *min;
int i,iden;
for(i=0;i<n;i++){
        p=min=head;iden=1;
        super();
        do{
            if(p->state=='W'&&p->ts<=time)
                if(iden){
                        min=p;iden=0;
                    }
                else if(p->super>min->super) min=p;
            p=p->link;
        }while(p!=NULL);
        if(iden) {
            i--;time++;printf("\ntime=%d:\tno JCB submib...wait...",time);
            if(time>1000){printf("\nruntime is too long...error...");getchar();}
            }
        else{
        running(min,m);
        }
}
}

void sjf(int m){
    JCB *min;
    int i,iden;
    for(i=0;i<n;i++){
        p=min=head;iden=1;
        do{
            if(p->state=='W'&&p->ts<=time)
                if(iden){
                        min=p;iden=0;
                    }
                else if(p->ntime<min->ntime) min=p;
            p=p->link;
        }while(p!=NULL) ;
        if(iden) {
            i--;printf("\ntime=%d:\tno JCB submib...wait...",time);time++;
            if(time>100){printf("\nruntime is too long...error");getchar();}
            }
        else{
            running(min,m);
        }
    }
}

void fcfs(int m){
    int i,iden;
    printf("\n\nthe jcb is runing...");
    for(i=0;i<n;i++){
        p=head;iden=1;
        do{
            if(p->state=='W'&&p->ts<=time)  iden=0;
            if(iden)p=p->link;
        }while(p!=NULL&&iden) ;
        if(iden) {
            i--;printf("\ntime=%d:\tno JCB submib...wait...",time);time++;
            if(time>100){printf("\nruntime is too long...error");getchar();}
            }
        else{
            running(p,m);
        }
    }
}



void runjcb(int m){

    printf("\n\n 开始运行作业...");
    switch(m){
        case 1:fcfs(m);break;
        case 2:sjf(m);break;
        case 3:hrn(m);break;
        default:printf("\n运行作业错误...\n");exit(0);
    }
}

void fileway(){
    printf("\nadopts the file way to input the datas...y/n:") ;
    if(getchar()=='y') fileinput();
    else inital();
}

void start(){
    int m;
    char str[100]="\n选择操作:\n1.FCFS(先来先服务)\n2.SJF(最短作业优先)\n3.HRN(响应比高者优先)\n" ;
    printf("%s",str);
    m=getchar()-48;

    fileway();
    if(1<=m&&m<=3) runjcb(m);
    else {
        printf("\n选择错误 再输入...\n");
        start();
    }
    last();

}


void main(){



start();
    printf("\n完成!");
    getchar();
}