Demonstrate the concept of Mutual Exclusion in Parallel Processing

For this program you must have some knowledge of mutual exclusion and pointers

#include<stdio.h>
#include "shmlib.h"

main(){
int *lock1,id, sid1, sid2, *i, j;

//this allocates memory of int size and this is a shared memory which is accessed from sd1
lock1 = (int*)shared(sizeof(int),&sid1);

//initializing lock
init_lock(lock1);

//this allocates memory of int size and this is a shared memory which is accessed from sd2
i=(int*)shared(sizeof(int),&sid2);

*i=110;
j=110;

printf("before fork : %d %d\n",*i,j);
id=create_process(2);
lock(lock1);

*i=id;
j=id*2;

printf("After Fork : %d %d\n", i*,j);

//lock released
unlock(lock1);

join_process(3,id);
printf("After Join : %d %d\n",*i,j);

//memory released
free_shm(sid1);
free_shm(sid2);
}