#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sem.h>
#include <assert.h>
#include <time.h>
#define N 5
#define LEFT (i - 1) % N
#define RIGHT (i + 1) % N

#define THINKING 0
#define HUNGRY 1
#define EATING 2
#define MAX_TIME 5
int key1, key2;
typedef int semaphore;
int state[N];
semaphore mutex = 1;
semaphore s[N];

void down(int semdec)
{
    struct sembuf semd;
    semd.sem_num = 0;
    semd.sem_op = -1;
    semd.sem_flg = 0;
    semop(semdec, &semd, 1);
}

void up(int semdec)
{
    struct sembuf semd;
    semd.sem_num = 0;
    semd.sem_op = 1;
    semd.sem_flg = 0;
    semop(semdec, &semd, 1);
}


void Test(int i){
    if(state[i] == HUNGRY && state[LEFT] != EATING && state[RIGHT] != EATING){
        state[i] = EATING;
        up(&s[i]);
    }
}


void TakesForks(int i){
    down(&mutex);
    state[i] = HUNGRY;
    Test(i);
    up(&mutex);
    down(&s[i]);
    printf("%d ", i);
    printf("КУШАЕТ\n");
    fflush(stdout);
}

void PutForks(int i){
    down(&mutex);
    state[i] = THINKING;
    Test(LEFT);
    Test(RIGHT);
    up(&mutex);
    printf("%d ", i);
    printf("ЧИЛЛИТ\n");
    fflush(stdout);
}


void philosopher(int i){
    while(1){
        int th_time = rand() % MAX_TIME;
        sleep(th_time); //размышления
        TakesForks(i);
        int eat_time = rand() % MAX_TIME;
        sleep(eat_time); //кушает
        PutForks(i);
    }
}



int main(){
    key1 = ftok("./6tsk.c", 'S');
    int mutex = semget(key1, 0, 0);
    key2 = ftok("./6tsk.c", 'S');
    int s = semget(key2, 2, 0);
    if(fork() == 0){
        philosopher(1);
    }
    if(fork() == 0){
        philosopher(2);
    }
    if(fork() == 0){
        philosopher(3);
    }
    if(fork() == 0){
        philosopher(4);
    }
    if(fork() == 0){
        philosopher(5);
    }
    char c;
    if (c = getchar() == EOF){
        return 0;
    }
};