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# Program to calculate average of the elements of an array and then the average deviation using race condition

Posted By: Lola Hughes     Category: C Programming     Views: 32392

## Code for Program to calculate average of the elements of an array and then the average deviation using race condition 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"int main()
{
int arr;
int 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;    // 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);

spin_lock_init(lock);        // Spin Lock 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.    ---------------------------------------------------------------------------    */

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);
return 0;
}

/* Output[divyen@localhost pp-tw3]\$ cc -o Prog01 -lm Prog01.c[divyen@localhost pp-tw3]\$ ./Prog01Enter the Size of an Array :5Enter arr :10Enter arr :20Enter arr :30Enter arr :40Enter arr :50Deviation : 19.580603*/```
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