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|
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#if defined (Win32)
# include <windows.h>
# define psleep(sec) Sleep ((sec) * 1000)
#elif defined (Linux)
# include <unistd.h>
# define psleep(sec) sleep ((sec))
#endif
#define INITIAL_STOCK 20
#define NB_CLIENTS 5
/* Structure stockant les informations des threads clients et du magasin. */
typedef struct
{
int stock;
pthread_t thread_store;
pthread_t thread_clients [NB_CLIENTS];
}
store_t;
static store_t store =
{
.stock = INITIAL_STOCK,
};
/* Fonction pour tirer un nombre au sort entre 0 et max. */
static int get_random (int max)
{
double val;
val = (double) max * rand ();
val = val / (RAND_MAX + 1.0);
return ((int) val);
}
/* Fonction pour le thread du magasin. */
static void * fn_store (void * p_data)
{
while (1)
{
if (store.stock <= 0)
{
store.stock = INITIAL_STOCK;
printf ("Remplissage du stock de %d articles !\n", store.stock);
}
}
return NULL;
}
/* Fonction pour les threads des clients. */
static void * fn_clients (void * p_data)
{
int nb = (int) p_data;
while (1)
{
int val = get_random (6);
psleep (get_random (3));
store.stock = store.stock - val;
printf (
"Client %d prend %d du stock, reste %d en stock !\n",
nb, val, store.stock
);
}
return NULL;
}
int main (void)
{
int i = 0;
int ret = 0;
/* Creation du thread du magasin. */
printf ("Creation du thread du magasin !\n");
ret = pthread_create (
& store.thread_store, NULL,
fn_store, NULL
);
/* Creation des threads des clients si celui du magasin a reussi. */
if (! ret)
{
printf ("Creation des threads clients !\n");
for (i = 0; i < NB_CLIENTS; i++)
{
ret = pthread_create (
& store.thread_clients [i], NULL,
fn_clients, (void *) i
);
if (ret)
{
fprintf (stderr, "%s", strerror (ret));
}
}
}
else
{
fprintf (stderr, "%s", strerror (ret));
}
/* Attente de la fin des threads. */
i = 0;
for (i = 0; i < NB_CLIENTS; i++)
{
pthread_join (store.thread_clients [i], NULL);
}
pthread_join (store.thread_store, NULL);
return EXIT_SUCCESS;
} |
