Logo 
Search:

C Programming Articles

Submit Article
Home » Articles » C Programming » Parallel Processing ProgramsRSS Feeds

Program to find standard deviation strdev using thread

Posted By: George Evans     Category: C Programming     Views: 6606

Write a Program to find standard deviation strdev using thread.

Code for Program to find standard deviation strdev using thread in C Programming

#include <stdio.h>
#include <pthread.h>

int a[100];
int nproc=3,N=10;
int barcount,over,count,total;
pthread_mutex_t lock,condlock;
pthread_cond_t co1,co2;
float average,final_dev;
void *work(void *arg);

main()
{
    int bar,k,ctr,i,j;
    pthread_t id;
    void **p;

    for(i=0;i<N;i++)
        scanf("%d",a+i);

    total=0;count=0;over=0;
    final_dev=0.0;barcount=0;
    pthread_mutex_init(&lock,NULL);
    pthread_mutex_init(&condlock,NULL);
    pthread_cond_init(&co1,NULL);
    pthread_cond_init(&co2,NULL);

    for(i=0;i<nproc;i++)
    {
        if(0==pthread_create(&id,NULL,work,(void *)i))
            continue;
        else
            printf("Thread creation failure....\n");
    }

    pthread_mutex_lock(&condlock);
        over=1;//printf("mainlock\n");if(0!=pthread_cond_broadcast(&co1))
             printf("ERR1...\n");
    pthread_mutex_unlock(&condlock);

    while(barcount!=nproc) sleep(1);

    count=0;average=total*1.0/N;

    pthread_mutex_lock(&condlock);
        barcount=0;
        //printf("main lock");
    pthread_cond_broadcast(&co2);
    pthread_mutex_unlock(&condlock);

    while(barcount!=nproc) sleep(1);

    printf("The Total is %d\n",total);
    printf("The Average is %f\n",average);
    printf("The Standard devn is %f\n",final_dev);

}

void *work(void *arg)
{
    int sum=0;
    int i,id;float dev=0;void *stat;

    pthread_mutex_lock(&condlock);
        if(over==0) 
        {
//            printf("lock\n");
            pthread_cond_wait(&co1,&condlock);
//            printf("unlock");
        }
    pthread_mutex_unlock(&condlock);

    id=(int) arg;
//        printf("thread id %d\n",pthread_self());while(1)
    {
        pthread_mutex_lock(&condlock);
            i=count;count+=5;
        pthread_mutex_unlock(&condlock);

        if(i<N)
        {
            int bound;
            bound=(N<i+5) ? N:i+5;
            for(;i<bound;i++)
                sum+=a[i];
            sleep(1);
        }
        elsebreak;

    }

    pthread_mutex_lock(&condlock);
        total+=sum;
    pthread_mutex_unlock(&condlock);

//    printf("%d did  %d  of  %d \n",id,sum,total);

    pthread_mutex_lock(&condlock);
        barcount++;
        if (barcount>0) pthread_cond_wait(&co2,&condlock);
    pthread_mutex_unlock(&condlock);

    while(1)
    {
        pthread_mutex_lock(&condlock);
            i=count;count+=5;
        pthread_mutex_unlock(&condlock);
        if(i<N)
        {
            int bound;
            bound=(N<i+5) ? N:i+5;
            for(;i<bound;i++)
                dev+=(average>a[i])?average-a[i]:a[i]-average;
            sleep(1);
        }
        elsebreak;

    }

        pthread_mutex_lock(&condlock);
            final_dev+=dev;
            barcount++;
        pthread_mutex_unlock(&condlock);
    
//        printf("Therad %d did %f of %f\n",id,dev,final_dev);

        pthread_exit(&stat);


}
  
Share: 


Didn't find what you were looking for? Find more on Program to find standard deviation strdev using thread Or get search suggestion and latest updates.

George Evans
George Evans author of Program to find standard deviation strdev using thread is from London, United Kingdom.
 
View All Articles

Related Articles and Code:


 
Please enter your Comment

  • Comment should be atleast 30 Characters.
  • Please put code inside [Code] your code [/Code].

 
No Comment Found, Be the First to post comment!