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Program to find factorial using self scheduling

Posted By: Wagner Fischer     Category: C Programming     Views: 7591

Write a Program to find factorial using self scheduling.

Code for Program to find 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;    
}
/*

Enter Number to Find Factorial :5

Partial Factorial of Process:1 is 120
Partial Factorial of Process:2 is 1
Partial Factorial of Process:3 is 1
Partial Factorial of Process:4 is 1
Partial Factorial of Process:0 is 1
Final Factorial is : 120

*/
  
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Wagner Fischer
Wagner Fischer author of Program to find factorial using self scheduling is from Frankfurt, Germany.
 
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