linux哲学家就餐问题

#include <semaphore.h>
#include <pthread.h>

#define NUM_PHILOSOPHERS 5

sem_t chopsticks[NUM_PHILOSOPHERS];

void* philosopher(void* num) {
    int i = *(int*)num;
    while (1) {
        // 思考
        printf("Philosopher %d is thinking
", i);
        // 饥饿并尝试拿起筷子
        sem_wait(&chopsticks[i]);
        sem_wait(&chopsticks[(i + 1)%NUM_PHILOSOPHERS]);
        // 吃饭
        printf("Philosopher %d is eating
", i);
        // 放下筷子
        sem_post(&chopsticks[i]);
        sem_post(&chopsticks[(i + 1)%NUM_PHILOSOPHERS]);
    }
}

int main() {
    pthread_t philosophers[NUM_PHILOSOPHERS];
    int philosopher_nums[NUM_PHILOSOPHERS];
    for (int i = 0; i < NUM_PHILOSOPHERS; i++) {
        sem_init(&chopsticks[i], 0, 1);
    }
    for (int i = 0; i < NUM_PHILOSOPHERS; i++) {
        philosopher_nums[i] = i;
        pthread_create(&philosophers[i], NULL, philosopher, &philosopher_nums[i]);
    }
    for (int i = 0; i < NUM_PHILOSOPHERS; i++) {
        pthread_join(philosophers[i], NULL);
    }
    for (int i = 0; i < NUM_PHILOSOPHERS; i++) {
        sem_destroy(&chopsticks[i]);
    }
    return 0;
}