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C++ Program For PRIORITY WITH PREEMPTIVE Scheduling Algorithm

C++ Program For PRIORITY WITH PREEMPTIVE Scheduling Algorithm

Priority Based Scheduling

  • Priority scheduling is a non-preemptive algorithm and one of the most common scheduling algorithms in batch systems.
  • Each process is assigned a priority. Process with highest priority is to be executed first and so on.
  • Processes with same priority are executed on first come first served basis.
  • Priority can be decided based on memory requirements, time requirements or any other resource requirement.
Priority Scheduling always selects the process(es) with the highest priority currently ready to run. If there is more than one process having the currently highest priority, you need a second scheduling algorithm to choose among these processes. Non-preemptive Priority Scheduling only selects a new process to run if the running process finished its work or yields (voluntarily) to the scheduler.
Preemptive Priority Scheduling is the same algorithm but if a new process having a higher priority than the currently running process arrives, it gets selected immediately. The new process has not to wait until the currently running process finishes or yields.

Source Code

  1. //C++ Program For PRIORITY WITH PREEMPTIVE Scheduling Algorithm
  2. #include<iostream>
  3. using namespace std;
  4. int main()
  5.  {

  7.    int x,n,p[10],pp[10],pt[10],w[10],t[10],awt,atat,i;
  8.    cout<<"Enter the number of process : ";
  9.    cin>>n;
  10.    cout<<"\n Enter process : time priorities \n";
  11.    for(i=0;i<n;i++)
  12.     {
  13.       cout<<"\nProcess no  : "<<i+1<<" : ";
  14.       cin>>pt[i]>>pp[i];
  15.       p[i]=i+1;
  16.     }
  17.   for(i=0;i<n-1;i++)
  18.    {
  19.      for(int j=i+1;j<n;j++)
  20.      {
  21.        if(pp[i]<pp[j])
  22.        {
  23.          x=pp[i];
  24.          pp[i]=pp[j];
  25.          pp[j]=x;
  26.          x=pt[i];
  27.          pt[i]=pt[j];
  28.          pt[j]=x;
  29.          x=p[i];
  30.          p[i]=p[j];
  31.          p[j]=x;
  32.       }
  33.    }
  34. }
  35. w[0]=0;
  36. awt=0;
  37. t[0]=pt[0];
  38. atat=t[0];
  39. for(i=1;i<n;i++)
  40.  {
  41.    w[i]=t[i-1];
  42.    awt+=w[i];
  43.    t[i]=w[i]+pt[i];
  44.    atat+=t[i];
  45.  }
  46. cout<<"\n\n Job \t Burst Time \t Wait Time \t Turn Around Time   Priority \n";
  47. for(i=0;i<n;i++)
  48.   cout<<"\n"<<"\t\t"<<p[i]<<"\t\t"<<pt[i]<<"\t\t"<<w[i]<<"\t\t"<<t[i]<<"\t\t"<<pp[i];
  49. awt/=n;
  50. atat/=n;
  51. cout<<"\n Average Wait Time : %d \n"<<awt;
  52. cout<<"\n Average Turn Around Time : %d \n"<<atat;
  53. return 0;
  54. }

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