42_Philosopher/philo.c

#include "philo.h"
#include "struct.h"
#include "time.h"
#include "data.h"
#include <pthread.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <unistd.h>
#include "./print.h"

void	philo_destroyer(t_philo *philo)
{
	pthread_mutex_destroy(&philo->nb_meal_mutex);
	pthread_mutex_destroy(&philo->last_sleep_mutex);
	pthread_mutex_destroy(&philo->last_eat_mutex);
	free(philo);
}

bool	check(t_philo *philo, t_data *data)
{
	bool	stop;

	pthread_mutex_lock(&data->stop_mutex);
	stop = data->stop;
	pthread_mutex_unlock(&data->stop_mutex);
	if (stop)
	{
		pthread_mutex_lock(&philo->stop_mutex);
		philo->stop = 1;
		pthread_mutex_unlock(&philo->stop_mutex);
	}
	return (stop);
}

void	eat(t_philo *philo, t_data *data)
{
	print_take_a_fork(philo);
	print_take_a_fork(philo);
	print_eating(philo);
	usleep(data->eat_time * 1000);
	pthread_mutex_lock(&philo->nb_meal_mutex);
	philo->nb_meal++;
	pthread_mutex_unlock(&philo->nb_meal_mutex);
	pthread_mutex_lock(&data->forks_mutex);
	data->forks[philo->id] = 1;
	data->forks[(philo->id + 1) % data->nb_philos] = 1;
	pthread_mutex_unlock(&data->forks_mutex);
}

bool	philo_eat(t_philo *philo, t_data *data)
{
	bool	left_fork;
	bool	right_fork;

	left_fork = 0;
	right_fork = 0;
	while (left_fork == 0 || right_fork == 0)
	{
		if (check(philo, data))
			return (1);
		pthread_mutex_lock(&data->forks_mutex);
		left_fork = data->forks[philo->id]; 
		if (((philo->id + 1) % data->nb_philos) != philo->id)
			right_fork = data->forks[(philo->id + 1) % data->nb_philos];
		if (right_fork && left_fork)
		{
			data->forks[philo->id] = 0;
			data->forks[(philo->id + 1) % data->nb_philos] = 0;
		}
		pthread_mutex_unlock(&data->forks_mutex);
		usleep(10);
	}
	eat(philo, data);
	pthread_mutex_lock(&philo->last_eat_mutex);
	philo->last_eat = get_time();
	pthread_mutex_unlock(&philo->last_eat_mutex);
	return (0);
}

void	philo_sleep(t_data *data, t_philo *philo)
{
	print_sleeping(philo);
	usleep(data->sleep_time * 1000);
}


void	*philo_routine(void *arg)
{
	t_philo		*philo;
	t_data		*data;

	philo = arg;
	data = philo->data;
	print_thinking(philo);
	usleep(philo->id * (data->life_expectency / data->nb_philos));
	while (true)
	{
		if (check(philo, data))
			return (NULL);
		if (philo_eat(philo, data))
			return (NULL);
		if (check(philo, data))
			return (NULL);
		philo_sleep(data, philo);
		if (check(philo, data))
			return (NULL);
		print_thinking(philo);
	}
	return (NULL);
}

t_philo	*philo_init(t_data *data)
{
	t_philo			*philo;
	static size_t	id = 0;

	philo = malloc(sizeof(t_philo));
	if (philo == NULL)
		return (NULL);
	philo->id = id++;
	philo->data = data;
	philo->nb_meal = 0;
	philo->last_eat = get_time();
	pthread_mutex_init(&philo->nb_meal_mutex, NULL);
	pthread_mutex_init(&philo->last_eat_mutex, NULL);
	pthread_mutex_init(&philo->last_sleep_mutex, NULL);
	pthread_mutex_init(&philo->stop_mutex, NULL);
	return (philo);
}