操作系统：The Dining Philosophers Problem

哲学家进餐问题

#include
#include
#include
#includepthread_mutex_t chopstick[5]; //5把锁，也就是5根筷子。void*tfn(void *arg)
{int i = (int)arg;int left,right;  //左右筷子的编号。if(i == 4){left = 0;right = i;}else{left = i;right = i+1;}while(1){sleep(1);  //思考pthread_mutex_lock(&chopstick[left]); //拿到左手的筷子。printf("philosopher %d fetches chopstick %d\n",i,left);if(pthread_mutex_trylock(&chopstick[right]) != 0 )//拿右手的筷子失败{pthread_mutex_unlock(&chopstick[left]); //右手筷子被拿走，放下左手的筷子。continue;}printf("philosopher %d fetches chopstick %d\n",i,right);printf("philosopher %d is eating.\n",i);sleep(2);  //吃饭pthread_mutex_unlock(&chopstick[right]); //放下右手的筷子。printf("philosopher %d release chopstick %d\n",i,right);pthread_mutex_unlock(&chopstick[left]); //放下右手的筷子。printf("philosopher %d release chopstick %d\n",i,left);}
}int main()
{pthread_t tid[5]; //5个哲学家int i ;for(i = 0; i < 5; ++i){pthread_mutex_init(&chopstick[i],NULL);pthread_create(&tid[i],NULL,tfn,(void*)i);}for( i = 0; i < 5; ++i){pthread_join(tid[i],NULL);}return 0;
}

运行结果：

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