Program to demonstrate the shared memory model of programming in parallel processing

#include <stdio.h>
#include “shmlib.h”
#include <stdlib.h>

int main()
{
  int id, id1, a,b,c,d, *sum0, *sum1;
 
  sum0=(int *) shared(sizeof(int), &id1);
  sum1=(int *) shared(sizeof(int), &id1);
 
  *sum0= *sum1= 0;

  printf(“n n this program performs addition of four numbers entered by the user two child processes are created and each of them adds 2 numbers. at the end the child processes are killed and the parent processes adds the answer returned by both the child processes and display the final output n”);

  printf(“***********************”);
printf(“n Enter any four number:”);
scanf(“%d%d%d%d”, &a, &b, &c, &d);

id=create_process(3);

if(id==1)
  *sum0=a+b;
else
  *sum1=c+d;

join_process(3,id);

printf(“n All the child processes are killed”);
printf(“n n Sum of four numbers %d n n “,(*sum0 + *sum1));
free_shm(id1);

 return 0;
}