PROGRAM TO UNDERSTAND PRIORITY SCHEDULING ALGORITHM
/*
* C program to implement priority scheduling
*/
#include <stdio.h>
//Function to swap two variables
void swap(int *a,int *b)
{
int temp=*a;
*a=*b;
*b=temp;
}
int main()
{
int n;
printf("Enter Number of Processes: ");
scanf("%d",&n);
// b is array for burst time, p for priority and index for process id
int b[n],p[n],index[n];
for(int i=0;i<n;i++)
{
printf("Enter Burst Time and Priority Value for Process %d: ",i+1);
scanf("%d %d",&b[i],&p[i]);
index[i]=i+1;
}
for(int i=0;i<n;i++)
{
int a=p[i],m=i;
//Finding out highest priority element and placing it at its desired position
for(int j=i;j<n;j++)
{
if(p[j] > a)
{
a=p[j];
m=j;
}
}
//Swapping processes
swap(&p[i], &p[m]);
swap(&b[i], &b[m]);
swap(&index[i],&index[m]);
}
// T stores the starting time of process
int t=0;
//Printing scheduled process
printf("Order of process Execution is\n");
for(int i=0;i<n;i++)
{
printf("P%d is executed from %d to %d\n",index[i],t,t+b[i]);
t+=b[i];
}
printf("\n");
printf("Process Id Burst Time Wait Time TurnAround Time\n");
int wait_time=0;
for(int i=0;i<n;i++)
{
printf("P%d %d %d %d\n",index[i],b[i],wait_time,wait_time + b[i]);
wait_time += b[i];
}
return 0;
}
Output:
Enter Number of Processes: 3
Enter Burst Time and Priority Value for Process 1: 10 2
Enter Burst Time and Priority Value for Process 2: 5 0
Enter Burst Time and Priority Value for Process 3: 8 1
Order of process Execution is
P1 is executed from 0 to 10
P3 is executed from 10 to 18
P2 is executed from 18 to 23
Process Id Burst Time Wait Time TurnAround Time
P1 10 0 10
P3 8 10 18
P2 5 18 23
Comments
Post a Comment