作业调度之先来先服务算法C语言实现

言曌 2017年06月07日19:00:44 2 9375 views

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代码如下

/*
@author WellsLiu
@url liuyanzhao.com
*/
#include"stdio.h"
#include"stdlib.h"
typedef struct PCB //定义进程控制块
{ char name[10]; //进程名
char state; //运行状态
int ArriveTime; //到达时间
int StartTime; //进程开始时间
int FinishTime; //进程结束时间
int ServiceTime; //服务时间
float WholeTime;//周转时间
float WeightWholeTime;//带权周转时间
double AverageWT_FCFS; //平均周转时间
double AverageWWT_FCFS;//带权平均周转时间
struct PCB *next; //指向下个进程
}pcb;
double x=0,y=0;
int i;
int time; //计时器
int n; //进程个数
pcb *head=NULL,*p,*q; //进程链表指针
void run_FCFS(pcb *p1) //运行未完成的进程
{
time = p1->ArriveTime > time? p1->ArriveTime:time;
p1->StartTime=time;
// printf("\n时刻：%d, 当前开始运行作业%s\n\n",time,p1->name);
time+=p1->ServiceTime;
p1->state='T';
p1->FinishTime=time;
p1->WholeTime=p1->FinishTime-p1->ArriveTime;
p1->WeightWholeTime=p1->WholeTime/p1->ServiceTime;
x+=p1->WholeTime;
y+=p1->WeightWholeTime;
p1->AverageWT_FCFS=p1->WholeTime/n;
p1->AverageWWT_FCFS=p1->WeightWholeTime/n;
printf("%4s %6d %10d %10d %8d %10.1f %10.2f %12.2f %14.2f\n",p1->name,p1->ArriveTime,p1->StartTime,p1->ServiceTime,p1->FinishTime,p1->WholeTime,p1->WeightWholeTime,p1->AverageWT_FCFS,p1->AverageWWT_FCFS);
}
void FCFS() //找到当前未完成的进程
{
int i;
p=head;
printf("\n============================================================================================================\n");
printf("作业名到达时间开始时间服务时间完成时间周转时间带权周转时间平均周转时间平均带权周转时间 \n");
printf("------------------------------------------------------------------------------------------------------------\n");
for(i=0;i<n;i++)
{
if(p->state=='F')
{
q=p; //标记当前未完成的进程
run_FCFS(q);
}
p=p->next;
}
printf("\n============================================================================================================\n");
}
void getInfo() //获得进程信息并创建进程
{
int num;
printf("\n进程个数:");
scanf("%d",&n);
for(num=0;num<n;num++)
{
p=(pcb *)malloc(sizeof(pcb));
printf("依次输入：进程名到达时间服务时间\n");
scanf("%s\t%d\t%d",&p->name,&p->ArriveTime,&p->ServiceTime);
if(head==NULL)
{head=p;q=p;time=p->ArriveTime;}
if(p->ArriveTime < time) time=p->ArriveTime;
q->next=p;
p->StartTime=0;
p->FinishTime=0;
p->WholeTime=0;
p->WeightWholeTime=0;
p->next=NULL;
p->state='F';
q=p;
}
}
void main()
{ printf("先来先服务FCFS算法模拟\n");
getInfo();
p=head;
FCFS();
}