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

static void *
thread_func(void * _tn)
{
    int seed = 1;
    int i, tn = (int)_tn;
    for (i = 0; i < 3; i++)
        printf("thread=%d rand=%d\n", tn, rand_r(&seed));
    return NULL;
}

int
main()
{
    int i, N = 4;
    pthread_t t[N];
    for (i = 0; i < N; i++)
        pthread_create(t + i, NULL, 
            thread_func, (void *)i);

    for (i = 0; i < N; i++)
        pthread_join(t[i], NULL);
    return 0;
}