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#include <stdio.h>
#include <semaphore.h>
#include <stdlib.h>
#include <pthread.h>
#include <errno.h>
#include <error.h>
#include <string.h>
#include <unistd.h>
void raler (char * msg)
{
perror(msg);
exit(EXIT_FAILURE);
}
typedef struct {
int compteur;
pthread_mutex_t * mut;
pthread_cond_t *cond ;
} monsem_t;
struct tampon {
char buf[10];
monsem_t *sem_prod;
monsem_t *sem_ecr; // ecrites
monsem_t *sem_libres;
monsem_t * sem_lec;
int id_prod;
int id_cons;
};
struct tampon * tampon;
int monsem_init(monsem_t * sem, int init)
{
int retour =0;
if(init < 0){
retour =-1;
} else {
sem->mut=malloc(sizeof(pthread_mutex_t));
if(sem->mut == NULL) retour =-1;
if((errno =pthread_mutex_init (sem->mut,NULL)) >0 )
retour=-1;
sem->cond=malloc(sizeof(pthread_cond_t));
if(sem->cond == NULL) retour =-1;
if((errno =pthread_cond_init (sem->cond,NULL)) >0 )
retour=-1;
sem->compteur=init;
}
return retour;
}
int monsem_p(monsem_t * sem)
{
int retour =0;
if((errno = pthread_mutex_lock(sem->mut)) >0)
retour =-1;
sem->compteur--;
while(sem->compteur < 0)
pthread_cond_wait(sem->cond,sem->mut);
if((errno = pthread_mutex_unlock(sem->mut)) >0)
retour=-1;
return retour;
}
int monsem_v (monsem_t * sem)
{
int retour =0;
if((errno = pthread_mutex_lock(sem->mut)) >0)
retour =-1;
sem->compteur++;
if(sem->compteur <= 0)
pthread_cond_signal(sem->cond);
if((errno = pthread_mutex_unlock(sem->mut)) >0)
retour=-1;
return retour;
}
void * thread_produit (void * args)
{
struct tampon *ag=(struct tampon *)args;
char d='\0';
int boucle =1;
while(boucle){
read(0,&d,sizeof(char));
if(monsem_p(ag->sem_libres) == -1)
raler("monsem_wait");
if(monsem_p(ag->sem_prod) == -1)
raler("sem_wait");
printf("P %c\n",d);
ag->buf[ag->id_prod]=d;
ag->id_prod=(ag->id_prod+1)%10;
if(monsem_v(ag->sem_prod) == -1)
raler("monsem_wait");
if(monsem_v(ag->sem_ecr) == -1)
raler("sem_wait");
if(d==EOF){
boucle=0;
}
}
pthread_exit(NULL);
}
int main(){
struct tampon * tampon;
if( (tampon=malloc(sizeof (struct tampon)) ) == NULL)
raler("malloc");
monsem_t sem_lec; // Lecteur
monsem_t sem_prod; // Écrivain
monsem_t sem_ecr; // Écrites
monsem_t sem_libres; // Libres
if((errno = monsem_init(&sem_prod,1)) > 0)
raler("sem_init");
if((errno = monsem_init(&sem_lec,1)) > 0)
raler("sem_init");
if((errno = monsem_init(&sem_ecr,0)) > 0)
raler("sem_init");
if((errno = monsem_init(&sem_libres,10)) > 0)
raler("sem_init");
tampon->sem_ecr=&sem_ecr;
tampon->sem_lec=&sem_lec;
tampon->sem_prod=&sem_prod;
tampon->sem_libres=&sem_libres;
tampon->id_prod=0;
tampon->id_cons=0;
pthread_t prod_tid;
if((errno = pthread_create(&prod_tid,NULL,thread_produit,tampon)) > 0)
raler("Erreur prod pthread create ");
int boucle=1;
while(boucle){
if(monsem_p(tampon->sem_ecr) == -1)
raler("sem_wait");
if(monsem_p(tampon->sem_lec) == -1)
raler("sem_wait");
if(tampon->buf[tampon->id_cons] == EOF){
boucle = 0;
} else {
printf("C %c\n",tampon->buf[tampon->id_cons]);
tampon->id_cons=(tampon->id_cons+1)%10;
}
if(monsem_v(tampon->sem_lec) == -1)
raler("sem_post : semaphore invalide");
if(monsem_v(tampon->sem_libres) == -1)
raler("sem_post:semaphore invalide");
}
if((errno=pthread_join(prod_tid,NULL)) > 0)
raler("pthread_join");
if((errno = pthread_cond_destroy(tampon->sem_ecr->cond))!=0)
raler("pthread_cond_destroy");
if((errno = pthread_cond_destroy(tampon->sem_lec->cond))!=0)
raler("pthread_cond_destroy");
if((errno = pthread_cond_destroy(tampon->sem_libres->cond))!=0)
raler("pthread_cond_destroy");
if((errno = pthread_cond_destroy(tampon->sem_prod->cond))!=0)
raler("pthread_cond_destroy");
free(tampon);
return 0;
} |
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