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Title RoundRobin Scheduling using c
Author HEMAMALINI.R
Author Email jasmine_hm4021 [at] yahoo.co.in
Description performs round robin scheduling for the given processes

Category C » Beginners / Lab Assignments
Hits 321058
Code Select and Copy the Code
Code : #include<stdio.h> struct rr { int pid; int sertime,cputime,waittime,rcputime,tat; }a[10]; int n,q,k,prev,next,j,i,l,wtime; static float avgtat,avgwaittime; int main(void) { printf("RR SCHEDULING MECHANISM "); printf("ENTER THE NUMBER OF JOBS IN THE READY QUEUE "); scanf("%d",&n); for(i=0;i<n;i++) { printf("ENTER THE PROCESS ID AND SERVICE TIME OF THE JOB "); scanf("%d%d",&a[i].pid,&a[i].sertime); a[i].rcputime=a[i].sertime; } printf("ENTER THE TIME QUANTUM "); scanf("%d",&q); a[0].cputime=0; if(a[0].sertime<q) { a[0].tat=a[0].sertime; a[0].rcputime=a[0].sertime-q; } else { a[0].tat=q; a[0].rcputime=a[0].sertime-q; } a[0].waittime=0; prev=0; next=1; while(1) { k=0; for(j=next;j<n;j++) { if(a[j].rcputime>0) { next=j; a[next].cputime=a[prev].tat; if(a[next].rcputime<q) a[next].tat=a[next].rcputime+a[next].cputime; else a[next].tat=q+a[next].cputime; wtime=a[next].sertime-a[next].rcputime; a[next].waittime=a[next].cputime-wtime; a[next].rcputime=a[next].rcputime-q; prev=next; } else k++; } if(k==n) break; next=0; } for(i=0;i<n;i++) { avgtat+=(float)a[i].tat/n; avgwaittime+=(float)a[i].waittime/n; } printf("PROCESSID SERVICETIME CPUACCESSTIME TURNAROUNDTIME WAITINGTIME "); for(i=0;i<n;i++) { printf("%d %d %d %d %d ",a[i].pid,a[i].sertime,a[i].cputime,a[i].ta t,a[i].waittime); } printf(" THE AVERAGE TURN AROUND TIME IS:%f",avgtat); printf(" THE AVERAGE WAITING TIME IS:%f",avgwaittime); }

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