/* the philosopher thread function - create N threads, each of which calls
* this function with its philosopher number 0..N-1
*/
void *philosopher_thread(void *context)
{
int philosopher_num = (int)context; /* hack... */
while (1) {
sleep_exp(4.0);
get_forks(philosopher_num);
sleep_exp(2.5);
release_forks(philosopher_num);
}
return 0;
}
/* the customer thread function - create 10 threads, each of which calls
* this function with its customer number 0..9
*/
void *customer_thread(void *context)
{
int customer_num = (int)context;
while(1){
/* maintaing a 10 secs gap between creation of two customer threads */
sleep_exp(10.0, NULL);
/* calling the customer function with the customer number as the argument */
customer(customer_num);
}
return 0;
}
/* the barber method
*/
void barber(void)
{
/* locking the mutex */
pthread_mutex_lock(&m);
while (1) {
if( customers_in_shop == 0)
{
printf("DEBUG: %f barber goes to sleep \n", timestamp() );
/* barber waiting for a customer to enter the shop */
pthread_cond_wait(&Barber, &m);
/* barber is signaled by the customer to wake up and it wakes up to cut hair */
printf("DEBUG: %f barber wakes up \n", timestamp());
}
// signal to start haircut of customer
pthread_cond_signal(&haircut_start);
/* incerment the barber's chair status to denote that its occupied*/
stat_count_incr(bchair_stat);
/* time what barber takes to cut hair */
sleep_exp(1.2, &m);
/* barber signal the customer on completion of the hair cut */
pthread_cond_signal(&haircut_done);
/* barber waits inorder to check the status of number of customers in shop */
pthread_cond_wait(&c_left, &m);
}
/* unlock the mutex before returning from the function */
pthread_mutex_unlock(&m);
}
