#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);


}