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# Program to display Factorial using self scheduling

Posted By: Easy Tutor     Category: C Programming     Views: 4824

## Code for Program to display Factorial using self scheduling in C Programming

```# include <stdio.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 iNumber;
int iCount;                // Counter Variableint *fact,*index,*lock;          // Shared Variablesint shmidsum,shmidindex,shmidlock;  // ShmID's For 3 Shared Variables        int i;                    // For Storing Index Value in Processesint id;                    // To Store ID of the Processesint nproc=5;                // Number of Processesint parfact;

fact=(int*)sshared(sizeof(int),&shmidsum);
index=(int*)sshared(sizeof(int),&shmidindex);
lock=(int*)sshared(sizeof(int),&shmidlock);

*fact=1;
*index=2;

printf("Enter Number to Find Factorial :");
scanf("%d",&iNumber);

spin_lock_init(lock);

id=process_fork(nproc);

parfact=1;

while(1)
{
spin_lock(lock);
// Critical Region
i=*index;
*index=*index + 1;
spin_unlock(lock);

if(i>iNumber)
{
break; // Exit the While Loop When// Becomes > arrSize
}
parfact=parfact * i;

}

spin_lock(lock);
// Critical Region
*fact=*fact *  parfact;
spin_unlock(lock);

printf("\nPartial Factorial  of Process:%d is %d",id,parfact);
process_join(nproc,id);

printf("\n Final Factorial is : %d\n", *fact);

// Cleaning Shared Memory
cleanup_memory(&shmidindex);
cleanup_memory(&shmidsum);
cleanup_memory(&shmidlock);

return 0;
}
```
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