#include <stdio.h>
    #include <pthread.h>
    #include <unistd.h>
    static void * sum_line(int nr_line);

    int Sum;
    int A[4][4];

    int main() {
    pthread_t tid;
    Sum=0;
    printf("\nOrig thread tid(%d) Sum=%d", pthread_self(), Sum);
    pthread_create(&tid, NULL, &sum_line(0), NULL);
    printf("\nChild thread was created tid(%d)", tid);
    pthread_join(tid,NULL);
    printf("\nOrig thread tid(%d)-->Child thread ended tid(%d) Sum=%d",pthread_self(), tid, Sum);
    printf("\n");

    }

    static void * sum_line(int nr_line) {
        int i;
        for(i=0;i<4;i++) {
            Sum=Sum+A[i];
            printf("\nChild thread tid(%d), i=%d, Sum=%d",pthread_self(),i,Sum);
            sleep(2);
        }
        printf("\nChild thread tid(%d)--> ending", pthread_self());
    }