Parallel Processing Tutorial 3


1) write a program to find sum of 10 element of any array      using shared memory.

#include<stdio.h>
#include "head.h"
  int main()
  {
   int id,i,shmid,sum=0,sum1=0,*sum2,a[10];

     for(i=0;i<10;i++)
    {
         scanf("%d",&a[i]);
    }

         sum2=sharem(4,&shmid);
         *sum2=0;
         id=process_fork(2);

           if(id==0)
      {
            for(i=0;i<10;i=i+2)
           {
             sum1+=a[i];
           }
      }

         else
      {

         for(i=1;i<=10;i=i+2)
         {
             *sum2+=a[i];
         }
      }

       process_join(id,2);
       sum=sum1+*sum2;
       printf("sum=%d\n",sum);
       shmdt((void *)sum2);
       shmctl(shmid,IPC_RMID,NULL);
}

OUTPUT :
[08ce55@linux ~]$ vim tuto2.c
[08ce55@linux ~]$ gcc tuto2.c
[08ce55@linux ~]$ ./a.out
1
2
3
4
5
6
7
8
9
10
id=55

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