Thanks a lot jim.
Can I have a question that if some threads end before another is create, can I join them in some way please?

[I]there I create some

for (i = 0; i < NUM_E; i++)
{
pthread_create(&t_elves, NULL, f_elves, (void *)i);
}

and while are some threads creating, another can end but still isn't join, becouse I join these threads after I create them

- only one solution I have in my mind, that I can join that thread in another. Or is there other solution please ?