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routine.c
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routine.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* routine.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: yorlians <yorlians@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/06/28 03:36:28 by yorlians #+# #+# */
/* Updated: 2023/06/30 13:47:09 by yorlians ### ########.fr */
/* */
/* ************************************************************************** */
#include "philo.h"
/*
represent the behavior of a philosopher thread. check if philo_id
is even or odd. if it is they wait. This is to ensure that the philosophers
with even IDs don't start eating simultaneously, avoiding a potential
deadlock scenario.
*/
void *philo_routine(void *arg)
{
t_data_philo *philo;
philo = (t_data_philo *)arg;
if (philo -> philo_id % 2 == 0)
new_sleep(philo -> time_to_eat * 0.9);
while (alive_check(philo))
{
if (meal(philo) == -1)
return (NULL);
if (!alive_check(philo))
return (NULL);
print_info(philo, SLEEP);
new_sleep(philo -> time_to_sleep);
print_info(philo, THINK);
}
return (NULL);
}
/*
responsible for updating the meal status of the philosopher
after each meal
*/
void update_meal_status(t_data_philo *philo)
{
pthread_mutex_lock(philo -> priv_lock);
philo -> last_meal_time = get_time_now();
pthread_mutex_unlock(philo -> priv_lock);
if (philo -> eat_x_times != 0)
{
if (++philo -> ate_x_times == philo -> eat_x_times)
{
pthread_mutex_lock(philo -> main_lock);
*philo -> already_ate_max += 1;
pthread_mutex_unlock(philo -> main_lock);
}
}
}
/*
ensure that philosophers take forks only when they are available,
update their meal status, and handle cases where philosophers may
have only one fork.
*/
int meal(t_data_philo *philo)
{
if (!alive_check(philo))
return (-1);
pthread_mutex_lock(philo -> left_fork);
print_info(philo, TAKE_L_FORK);
if (!alive_check(philo))
return (pthread_mutex_unlock(philo -> left_fork), -1);
if (philo -> right_fork == NULL)
return (pthread_mutex_unlock(philo -> left_fork),
new_sleep(philo -> time_to_die * 1.1), -1);
pthread_mutex_lock(philo -> right_fork);
print_info(philo, TAKE_R_FORK);
print_info(philo, EAT);
if (!alive_check(philo))
return (pthread_mutex_unlock(philo -> left_fork),
pthread_mutex_unlock(philo -> right_fork), -1);
update_meal_status(philo);
if (!alive_check(philo))
return (pthread_mutex_unlock(philo -> left_fork),
pthread_mutex_unlock(philo -> right_fork), -1);
new_sleep(philo -> time_to_eat);
pthread_mutex_unlock(philo -> right_fork);
pthread_mutex_unlock(philo -> left_fork);
return (0);
}
/*
check if the philosophers are alive
*/
int alive_check(t_data_philo *philo)
{
pthread_mutex_lock(philo -> main_lock);
if (!philo -> stop)
{
pthread_mutex_unlock(philo -> main_lock);
return (1);
}
pthread_mutex_unlock(philo -> main_lock);
return (0);
}