Problème de threads

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

int tab_heure[5];

void heure(){ 
  for(;;) {
    tab_heure[0] = (tab_heure[0] + 1) mod 1000;
    if (tab_heure[0] = 0    
    tab_heure[1] = (tab_heure[1] + 1) mod 60;
    if (tab_heure[1] = 0    
    tab_heure[2] = (tab_heure[2] + 1) mod 60;
    if (tab_heure[2] = 0    
    tab_heure[3] = (tab_heure[3] + 1) mod 24;
    if (tab_heure[3] = 0    
    tab_heure[4] = tab_heure[4] + 1; attendre (1 seconde); }
}

main()
{
  pthread_t num_thread;
  if (pthread_create(&num_thread, NULL, (void *(*)())heure, NULL) == -1)
    perror ("pb pthread_create\n");
    for(;;) {
      printf(
        "L’heure du système est : %d jour,%d heure;%d minutes,%d secondes,%d, millisecondes",
        tab_heure[4],
        tab_heure[3],
        tab_heure[2],
        tab_heure[1],
        tab_heure[0]
      )
    };
  attendre (5 secondes)
  }