calculate average of the elements of an array and then the average deviation using barrier.

Write a program to calculate average of the elements of an array and then the average deviation using barrier.

Code for Program to calculate average of the elements of an array and then the average deviation using barrier in C Programming

# include <stdio.h>
# include <math.h>
# include "/usr/include/sys/types.h"
# include "/usr/include/sys/shm.h"
# include "/usr/include/sys/ipc.h"
# include "/usr/include/sys/sem.h"
# include "forkjoin.h"
# include "sharedlib.h"
# include "spinlock.h"
# include "barrier.h"int main()
{
    int arr[100];
    int *bararr;        // Barrier Arrayint arrSize;        //Size of arrayint iCount;        //Counter Variableint id;            //Process IDint nProc=3;        //number of Processesfloat sum=0;
    
    float *deviation,*avg;  // Shared Variablesint *lock;        // Shared Variable for Spinlockint shmidavg,shmidlock,shmiddeviation,shmidbararr;    // Shmid for Shared Variables
    
    printf("Enter the Size of an Array :");
    scanf("%d",&arrSize);

    for(iCount=0;iCount<arrSize;iCount++)
    {
        printf("Enter arr[%d] :",iCount);
        scanf("%d",&arr[iCount]);
    }

    /* Allocate Shared memory */
    avg=(float*)sshared(sizeof(float),&shmidavg);
    deviation=(float*)sshared(sizeof(float),&shmiddeviation);
    lock=(int*)sshared(sizeof(int),&shmidlock);
    bararr=(int*)sshared(sizeof(int)*4,&shmidbararr);

    spin_lock_init(lock);        // Spin Lock Initialization
    
    barrier_init(bararr,nProc);    // Barrier Initialization
    
    *avg=0;

    id=process_fork(nProc);        // Forking Processes/* Partial Sum using Loop Spliting */for(iCount=id;iCount<arrSize;iCount=iCount+nProc)
    {
        sum = sum + arr[iCount];
    }

    spin_lock(lock);
        /* Critical Region */
        *avg = *avg + ( sum /arrSize);    // Calculate Average from Partial Sums
    spin_unlock(lock);

    /*    ---------------------------------------------------------------------------    Barrier Should be here, So that all Processes have to wait until Final    Average is Calculated.    ---------------------------------------------------------------------------    */
    
    barrier(bararr);    // Barrier Called
    
    
    sum=0;
    /* Calculate Sum(Xi - Mean) Using Loop Spliting */for(iCount=id;iCount<arrSize;iCount=iCount+nProc)
    {
        sum = sum + pow(((float)arr[iCount] - *avg),2);
    }
    
    spin_lock(lock);
        /* Critical Region */
        *deviation = *deviation + (sum / arrSize-1); // Calculate Final Deviation
    spin_unlock(lock);

    
    process_join(nProc,id);        // Joining the Process

    *deviation=sqrt(*deviation);
    printf("Deviation : %f\n",*deviation);

    /* Cleaning the Shared Region */
    cleanup_memory(&shmidavg);
    cleanup_memory(&shmidlock);
    cleanup_memory(&shmiddeviation);
    cleanup_memory(&shmidbararr);
    return 0;
}