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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* philo_eat.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dkaiser <dkaiser@student.42heilbronn.de +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2025/01/21 18:15:40 by dkaiser #+# #+# */
/* Updated: 2025/01/27 14:37:24 by dkaiser ### ########.fr */
/* */
/* ************************************************************************** */
#include "ft_utils.h"
#include "philo.h"
#include <pthread.h>
static void take_fork(t_philo *philo, t_fork *fork)
{
pthread_mutex_lock(&fork->mutex);
if (fork->owner == 0)
{
fork->owner = philo->id;
ft_log(philo->id, "has taken a fork");
}
pthread_mutex_unlock(&fork->mutex);
}
static void release_fork(t_fork *fork)
{
pthread_mutex_lock(&fork->mutex);
fork->owner = 0;
pthread_mutex_unlock(&fork->mutex);
}
static void eat(t_philo *philo, t_fork *left_fork, t_fork *right_fork)
{
int started_eating;
ft_log(philo->id, "is eating");
started_eating = ft_cur_time_in_ms();
while (ft_cur_time_in_ms() < started_eating + philo->data->time_to_eat)
{
if (!philo->data->simulation_running)
return ;
if (philo_die(philo))
return ;
usleep(500);
}
philo->last_time_eaten = ft_cur_time_in_ms();
philo->times_must_eat -= 1;
release_fork(left_fork);
release_fork(right_fork);
}
void philo_eat(t_philo *philo)
{
t_fork *left_fork;
t_fork *right_fork;
left_fork = &philo->data->forks[philo->id - 1];
right_fork = &philo->data->forks[philo->id % philo->data->nbr_of_philos];
while (left_fork->owner != philo->id || right_fork->owner != philo->id)
{
if (philo->id % 2 == 0)
take_fork(philo, right_fork);
else if (philo->id % 2 == 1)
usleep(500);
take_fork(philo, left_fork);
take_fork(philo, right_fork);
if (!philo->data->simulation_running)
return ;
if (philo_die(philo))
return ;
if (left_fork->owner == philo->id && right_fork->owner == philo->id)
break ;
if (philo->id % 2 == 0)
usleep(500);
}
if (philo->data->nbr_of_philos > 1)
eat(philo, left_fork, right_fork);
}
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