///********************************************************************/
///* IUT NICE-COTE D'AZUR - Departement INFORMATIQUE - R. CHIGNOLI    */
///* Module DUT M311                                Theme PTHREADS    */
///********************************************************************/
/// demo_mutex.c : Demonstration simple d'utilisation des
///                pthreads-mutex rapides.
///                Utiliser par exemple les séquences LU0 LL0 LULU0 LUUL0

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>
#include <assert.h>

pthread_t filsA;
pthread_mutex_t fastmutex = PTHREAD_MUTEX_INITIALIZER;
char *sequence;

void* action (void* name) {
    int encore = 0;
    while (sequence [encore] != '0') {
       switch (sequence [encore]) {
         case 'L': printf("L ... ");
                 if (pthread_mutex_lock (&fastmutex) != 0)
                 printf("... L PB.\n"); else printf("... L OK.\n"); break;
         case 'U': printf("U ... ");
                 if (pthread_mutex_unlock (&fastmutex) != 0)
                 printf("... U PB.\n");  else printf("... U OK.\n"); break;
         case 'X': printf("X ... ");
                 if (pthread_mutex_destroy (&fastmutex) != 0)
                 printf("... X PB.\n");  else printf("... X OK.\n"); break;
         default: printf("... Commande incorrecte\n");
       }
     encore ++;
  }
  printf("... Bye\n");
  return 0;
}

int main (int argc, char* argv[]) {
    pthread_t filsA;
    assert (argc ==2);
    sequence = argv[1];
    printf ("\nEssayer avec les sequences : LU0 LL0 LULU0 LUUL0\n\n");

    if (pthread_create(&filsA, NULL, action, "filsA")) {x
        perror("pthread_create");
        exit(-1);
        }

    printf("\nPERE (Thread principal) : boucle infinie\n\n") ;
    for(;;);
    return (0);
    }