Quiz on Condition Variables

What would be printed when running the following code? Assume ‘done’ is a shared variable initialized to 0.

void *child(void *arg) {
    printf("3");
    done = 1;
    return NULL;
}

int main(int argc, char *argv[]) {
    pthread_t p;
    printf("1");
    Pthread_create(&p, NULL, child, NULL);
    while (done == 0); 
    printf("2");
    return 0;
}