/* 
 * Programme simulant la gestion d'une imprimante
 *
 * Paradigme d'exclusion mutuelle.
 *
 * Utilisation de mutex
 *
 */
#include <pthread.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#define NBMAXTHREADS 100
#define NOMFICHIERMAX 80

pthread_mutex_t mutex;

void impression(char *nomFic){
  pthread_mutex_lock(&mutex);
  
  printf("Debut d'impression de \"%s\"...\n", nomFic);
  sleep(5); /* Simule la lenteur de l'impression */
  printf("...Fin d'impression de \"%s\"...\n", nomFic);

  pthread_mutex_unlock(&mutex);
}

void *imprimeur(void *args)
{
  char *nomFic;

  nomFic = (char *)args;
  impression(nomFic);

  free(nomFic);
  pthread_exit(NULL);
}


int main(){
  int i;
  pthread_t threadTab[NBMAXTHREADS];
  int nbThreads = 0;

  pthread_mutex_init(&mutex, NULL);

  do {
    int retcode;
    char *nomFic;
    
    nomFic = malloc(NOMFICHIERMAX * sizeof(char));
    if (nomFic == NULL)
      {
	perror("malloc");
	exit(EXIT_FAILURE);
      }

    printf("Nom du fichier a imprimer (taper '0' pour terminer) ? ");
    scanf("%s", nomFic);
    if (strcmp(nomFic,"0") == 0)
      {
	break;
      }

    retcode = pthread_create(&(threadTab[nbThreads]), NULL, imprimeur, nomFic);
    if (retcode != 0)
      {
	perror("pthread_create");
	exit(EXIT_FAILURE);
      }

    nbThreads ++;

  } while (nbThreads < NBMAXTHREADS);

  printf("Au revoir\n");

  
  for (i = 0; i < nbThreads; i ++)
    pthread_join(threadTab[i], NULL);

  pthread_mutex_destroy(&mutex);

  return EXIT_SUCCESS;
}