1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* child.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <me@cacharle.xyz> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/09/30 14:36:16 by cacharle #+# #+# */
/* Updated: 2021/01/10 14:24:05 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include "philo_three.h"
static void *st_routine_death(t_philo *philo)
{
while (true)
{
sem_wait(philo->sem_eat);
if (h_time_now() - philo->time_last_eat > philo->conf->timeout_death)
break ;
sem_post(philo->sem_eat);
usleep(2000);
}
event_die(philo);
return (NULL);
}
static void st_child_loop(t_philo *philo)
{
long int eat_counter;
eat_counter = 0;
philo->time_last_eat = h_time_now();
while (true)
{
sem_wait(philo->sem_grab);
event_take_fork(philo);
event_take_fork(philo);
sem_post(philo->sem_grab);
event_eat(philo);
eat_counter++;
if (philo->conf->meal_num != -1 && eat_counter == philo->conf->meal_num)
{
sem_wait(philo->sem_stdout);
sem_post(philo->sem_meal_num);
sem_post(philo->sem_stdout);
}
event_sleep(philo);
event_think(philo);
}
}
#define PHILO_SEM_EAT_PREFIX "semaphore_philo_three_eat_"
static bool st_child_setup(t_philo *philo)
{
if (!h_sem_create(PHILO_SEM_FINISH_NAME, 0, &philo->sem_finish) ||
!h_sem_create(philo_sem_eat_name(PHILO_SEM_EAT_PREFIX, philo->id),
1, &philo->sem_eat) ||
!h_sem_create(PHILO_SEM_NAME, 0, &philo->forks) ||
!h_sem_create(PHILO_SEM_STDOUT_NAME, 0, &philo->sem_stdout) ||
!h_sem_create(PHILO_SEM_MEAL_NUM_NAME, 0, &philo->sem_meal_num) ||
!h_sem_create(PHILO_SEM_START_NAME, 0, &philo->sem_start) ||
!h_sem_create(PHILO_SEM_GRAB_NAME, 0, &philo->sem_grab))
return (false);
return (true);
}
pid_t child_start(t_philo *philo)
{
pthread_t thread_death;
pid_t pid;
if ((pid = fork()) == -1)
return (-1);
if (pid == 0)
{
philo->sem_finish = SEM_FAILED;
if (!st_child_setup(philo))
{
if (philo->sem_finish != SEM_FAILED)
sem_post(philo->sem_finish);
exit(1);
}
sem_wait(philo->sem_start);
philo->time_last_eat = h_time_now();
if (pthread_create(&thread_death, NULL,
(t_routine)st_routine_death, philo) != 0)
exit(sem_post(philo->sem_finish));
pthread_detach(thread_death);
st_child_loop(philo);
exit(0);
}
return (pid);
}
|
