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144 lines
3.7 KiB
144 lines
3.7 KiB
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* philo_threads.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: narnaud <narnaud@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2021/11/26 07:43:48 by narnaud #+# #+# */
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/* Updated: 2022/05/16 22:28:37 by narnaud ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "philosophers.h"
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static int safe_print(char *str, t_room *room, int id)
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{
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int ret;
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if (!room->running)
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return (0);
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pthread_mutex_lock(room->lock);
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printf(str, room_clock(), id);
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ret = room->running;
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pthread_mutex_unlock(room->lock);
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return (ret);
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}
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int safe_wait(t_room *room, int start, int duration)
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{
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int ret;
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ret = room->running;
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while (ret && (room_clock() < (start + duration)))
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{
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pthread_mutex_lock(room->lock);
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ret = room->running;
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pthread_mutex_unlock(room->lock);
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usleep(50);
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}
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return (ret);
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}
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int waiter(t_room *room)
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{
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int *param;
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int i;
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int starvest;
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t_philo *philo;
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int ret;
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ret = 1;
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pthread_mutex_lock(room->lock);
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i = 0;
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param = room->param;
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starvest = param[MEALS_AMOUNT];
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while (ret && i < param[PHILO_AMOUNT])
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{
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philo = room->philos[i];
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pthread_mutex_lock(philo->lock);
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if (philo->eat_time + param[DIE_TIME] < room_clock())
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{
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printf("%d %d died\n", room_clock(), i);
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ret = 0;
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}
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if (philo->eat_amount < starvest)
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starvest = philo->eat_amount;
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pthread_mutex_unlock(philo->lock);
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i++;
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}
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pthread_mutex_unlock(room->lock);
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if (starvest == param[MEALS_AMOUNT])
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ret = 0;
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return (ret);
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}
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void *philos_life(void *r)
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{
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t_room *room;
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int *param;
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t_philo *philo;
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int id;
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int id_p;
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room = (t_room *)r;
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param = room->param;
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pthread_mutex_lock(room->lock);
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id = room->i;
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printf("Philo %d: \n", id);
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philo = room->philos[id];
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philo->eat_time = room_clock();
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id_p = (id + 1) % param[PHILO_AMOUNT];
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pthread_mutex_unlock(room->lock);
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while (1)
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{
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pthread_mutex_lock(philo->fork);
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if (!safe_print("%d %d has taken a fork\n", room, id))
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{
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pthread_mutex_unlock(philo->fork);
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break ;
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}
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pthread_mutex_lock(room->philos[id_p]->fork);
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safe_print("%d %d has taken a fork\n", room, id);
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if(!safe_print("%d %d is eating\n", room, id))
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{
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pthread_mutex_unlock(philo->fork);
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pthread_mutex_unlock(room->philos[id_p]->fork);
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break;
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}
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pthread_mutex_lock(philo->lock);
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philo->eat_time = room_clock();
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pthread_mutex_unlock(philo->lock);
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if (!safe_wait(room, room_clock(), param[EAT_DURATION]))
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{
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pthread_mutex_unlock(philo->fork);
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pthread_mutex_unlock(room->philos[id_p]->fork);
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break;
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}
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pthread_mutex_unlock(philo->fork);
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pthread_mutex_unlock(room->philos[id_p]->fork);
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if(!safe_print("%d %d is sleeping\n", room, id))
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break ;
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pthread_mutex_lock(philo->lock);
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philo->eat_amount++;
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pthread_mutex_unlock(philo->lock);
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if (!safe_wait(room, room_clock(), param[SLEEP_DURATION]))
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break ;
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if (!safe_print("%d %d is thinking\n", room, id))
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break ;
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}
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return (NULL);
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}
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int room_clock()
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{
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struct timeval time;
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int ret;
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static long int start_time = 0;
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gettimeofday(&time, NULL);
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if (!start_time)
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start_time = time.tv_sec * 1000 + time.tv_usec / 1000;
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ret = (int)(time.tv_sec * 1000 + time.tv_usec / 1000 - start_time);
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return (ret);
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}
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