PROGRAM TO UNDERSTAND ROUND ROBIN SCHEDULING ALGORITHM
/*
* Round Robin Scheduling Program in C
*/
#include<stdio.h>
int main()
{
//Input no of processed
int n;
printf("Enter Total Number of Processes:");
scanf("%d", &n);
int wait_time = 0, ta_time = 0, arr_time[n], burst_time[n], temp_burst_time[n];
int x = n;
//Input details of processes
for(int i = 0; i < n; i++)
{
printf("Enter Details of Process %d \n", i + 1);
printf("Arrival Time: ");
scanf("%d", &arr_time[i]);
printf("Burst Time: ");
scanf("%d", &burst_time[i]);
temp_burst_time[i] = burst_time[i];
}
//Input time slot
int time_slot;
printf("Enter Time Slot:");
scanf("%d", &time_slot);
//Total indicates total time
//counter indicates which process is executed
int total = 0, counter = 0,i;
printf("Process ID Burst Time Turnaround Time Waiting Time\n");
for(total=0, i = 0; x!=0; )
{
// define the conditions
if(temp_burst_time[i] <= time_slot && temp_burst_time[i] > 0)
{
total = total + temp_burst_time[i];
temp_burst_time[i] = 0;
counter=1;
}
else if(temp_burst_time[i] > 0)
{
temp_burst_time[i] = temp_burst_time[i] - time_slot;
total += time_slot;
}
if(temp_burst_time[i]==0 && counter==1)
{
x--; //decrement the process no.
printf("\nProcess No %d \t\t %d\t\t\t\t %d\t\t\t %d", i+1, burst_time[i],
total-arr_time[i], total-arr_time[i]-burst_time[i]);
wait_time = wait_time+total-arr_time[i]-burst_time[i];
ta_time += total -arr_time[i];
counter =0;
}
if(i==n-1)
{
i=0;
}
else if(arr_time[i+1]<=total)
{
i++;
}
else
{
i=0;
}
}
float average_wait_time = wait_time * 1.0 / n;
float average_turnaround_time = ta_time * 1.0 / n;
printf("\nAverage Waiting Time:%f", average_wait_time);
printf("\nAvg Turnaround Time:%f", average_turnaround_time);
return 0;
}
Output:
Enter Total Number of Processes:3
Enter Details of Process 1
Arrival Time: 0
Burst Time: 10
Enter Details of Process 2
Arrival Time: 1
Burst Time: 8
Enter Details of Process 3
Arrival Time: 2
Burst Time: 7
Enter Time Slot:5
Process ID Burst Time Turnaround Time Waiting Time
Process No 1 10 20 10
Process No 2 8 22 14
Process No 3 7 23 16
Average Waiting Time: 13.333333
Avg Turnaround Time: 21.666666
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