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

static pthread_mutex_t my_mutex;
static int tab[5];

void *read_tab_process(void * arg) {
    int i;

    pthread_mutex_lock(&my_mutex);

    for (i = 0 ; i != 5 ; i++)
        printf("read_process, tab[%d] vaut %d\n", i, tab[i]);

    pthread_mutex_unlock(&my_mutex);
    pthread_exit(0);
}

void *write_tab_process(void * arg) {
    int i;

    pthread_mutex_lock(&my_mutex);

    for (i = 0 ; i != 5 ; i++) {
        tab[i] = 2 * i;
        printf ("write_process, tab[%d] vaut %d\n", i, tab[i]);
        sleep (1); /* Relentit le thread d'ecriture... */
    }

    pthread_mutex_unlock(&my_mutex);
    pthread_exit(0);
}

int main (int ac, char **av) {
    pthread_t th1, th2;
    void *ret;

    pthread_mutex_init(&my_mutex, NULL);

    if (pthread_create(&th1, NULL, write_tab_process, NULL) < 0) {
        fprintf(stderr, "pthread_create error for thread 1\n");
        exit (1);
    }
    if (pthread_create(&th2, NULL, read_tab_process, NULL) < 0) {
        fprintf(stderr, "pthread_create error for thread 2\n");
        exit (1);
    }

    (void) pthread_join(th1, &ret);
    (void) pthread_join(th2, &ret);

    return 0;
}