void barber() {
while(true) {
sem_wait(customer_waiting);
cut_hair();
sem_signal(barber_sleeping);
}
}
static void *
machine(void *arg)
{
int id;
pthread_mutex_lock(&mut);
id = machine_id++;
pthread_mutex_unlock(&mut);
printf("Peluquero %d: creado\n", id);
while ( 1 )
{
int n;
pthread_mutex_lock(&mut);
/* Si hay algún cliente esperando, despertarlo */
while ( !(n = get_client()) )
{
/* Si no, a dormir */
printf("Peluquero %d: esperando cliente\n", id);
pthread_cond_wait(&clients_waiting, &mut);
}
pthread_mutex_unlock(&mut);
/* Cortar el pelo */
cut_hair(id, n);
}
return NULL;
}
void barber() {
while(true) {
sem_wait(customer_waiting);
sem_wait(seats_mutex);
free_seats++;
cut_hair();
sem_signal(barber_sleeping);
sem_signal(seats_mutex);
}
}
void *barber_thread(void *arg) {
for (;;) {
sem_wait(&customer);
printf("%s\n", "Barber: Next customer!");
printf("%s\n", "Barber: Good morning, sir");
sem_post(&barber);
cut_hair();
sem_wait(&customer_done);
printf("%s\n", "Barber: Very funny sir!");
sem_post(&barber_done);
printf("%s\n", "Barber: You're done!");
}
}
/* Thread defining Barber's behavior */
void* thread_barber (void* param)
{
struct shop_data* shop;
struct barber_data* barber;
void(*cut_hair)(int min, int max);
shop = (struct shop_data*)param;
barber = shop->barber;
cut_hair = sleep_within;
while (!shop->empty) {
printf("Barber -- sleeping\n");
sem_wait(&barber->awake);
printf("Barber -- cuttting hair\n");
cut_hair(MIN_TIME, MAX_TIME);
sem_post(&barber->done_cutting);
}
}
main () {
pid_t child;
int i;
int nop=0;
mutexid = semget(IPC_PRIVATE, 1, SEM_MODE);
customers = semget(IPC_PRIVATE, 1, SEM_MODE);
barbers = semget(IPC_PRIVATE, 1, SEM_MODE);
if( (mutexid == -1) || (customers == -1) || (barbers == -1))
printf("semget error");
initial_value.val = 1;
if( semctl(mutexid, 0, SETVAL, initial_value) == -1)
printf("semctl error \n");
initial_value.val = 0;
if( semctl(customers, 0, SETVAL, initial_value) == -1)
printf("semctl error \n");
initial_value.val = 0;
if( semctl(barbers, 0, SETVAL, initial_value) == -1)
printf("semctl error \n");
if( (child = fork() ) < 0) { printf("fork error"); }
if(child){
// child acts as producer
for(i=1; i <= CUS_NUM; i++){
usleep(10000);
printf("A Customer has Entered the store \n");
down(mutexid);
if(waiting<waitingchairs){
waiting=waiting+1;
up(customers);
printf("Customer is waiting \n");
up(mutexid);
down(barbers);
}//endif
else
{
up(mutexid);
left=left+1;
printf("Customer Left the shop \n");
}
} //endfor
}//end Child Process
else {
for(i=1; i<CUS_NUM; i++) {
down(customers);
down(mutexid);
waiting=waiting-1;
up(barbers);
up(mutexid);
cut_hair();
}//endwhile
printf("Customers who left %d",left);
if(semctl(mutexid, 0, IPC_RMID, nop) == -1)
printf("semctl error");
if(semctl(customers, 0, IPC_RMID, nop) == -1)
printf("semctl error");
if(semctl(barbers, 0, IPC_RMID, nop) == -1)
printf("semctl error");
}
return(EXIT_SUCCESS);
} //End of main
