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

pthread_mutex_t mutex[4];
int var[4]={0,0,0,0};
pthread_mutex_t lock=PTHREAD_MUTEX_INITIALIZER;

void *Mult(void *arg)
{
    int k = *((int*)arg);
    pthread_mutex_lock(&mutex[k]);
    k++;
    k*=250;
    int j = k-249;
    pthread_mutex_unlock(&lock);
    for(j;j<=k;j++)
    {
        if(j%3==0||j%5==0)var[(k/250)-1]+=j;
        }
    pthread_mutex_unlock(&mutex[(k/250)-1]);
    }

int main()
{
    int i;
    pthread_t threadid[4];
    for(i=0;i<4;i++)
    {
        pthread_mutex_init(&mutex[i],NULL);
        pthread_mutex_lock(&lock);
        pthread_create(&threadid[i],NULL,&Mult,&i);
        pthread_mutex_lock(&lock);
        pthread_mutex_unlock(&lock);
        }
    for(i=0;i<4;i++)pthread_mutex_lock(&mutex[i]);
    printf("resultado: %i\n",var[0]+var[1]+var[2]+var[3]);
    }