巧用chatGPT解决生产者消费者问题

背景

学校的操作系统课程布置了一项实验，是关于生产者消费者问题的，一开始毫无头绪，通过搜索引擎搜索出来的内容也五花八门，之后就想着能不能借助chatGPT解决这一个实验。

实验要求

1.编写程序解决生产者与消费者问题；

2.显示生产，消费物资的过程及缓冲区状态变化；

3.生产者与消费者需用进程或线程进行模拟。

使用chatGPT

我们先来看一下如何对chatGPT进行提问，提问的方法和好坏也会影响chatGPT回答的结果，所以要有一定的提问技巧。

来看一下GPT的回答

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>#define BUFFER_SIZE 5
#define NUM_ITEMS 10int buffer[BUFFER_SIZE];
int in = 0, out = 0, count = 0;pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t full = PTHREAD_COND_INITIALIZER;
pthread_cond_t empty = PTHREAD_COND_INITIALIZER;void *producer(void *arg) {int i;for (i = 0; i < NUM_ITEMS; i++) {pthread_mutex_lock(&mutex);while (count == BUFFER_SIZE) {pthread_cond_wait(&empty, &mutex);}buffer[in] = i;in = (in + 1) % BUFFER_SIZE;count++;printf("Produced item %d\n", i);printf("Buffer contents:");int j;for (j = 0; j < BUFFER_SIZE; j++) {printf(" %d", buffer[j]);}printf("\n\n");pthread_cond_signal(&full);pthread_mutex_unlock(&mutex);}return NULL;
}void *consumer(void *arg) {int i;for (i = 0; i < NUM_ITEMS; i++) {pthread_mutex_lock(&mutex);while (count == 0) {pthread_cond_wait(&full, &mutex);}int item = buffer[out];out = (out + 1) % BUFFER_SIZE;count--;printf("Consumed item %d\n", item);printf("Buffer contents:");int j;for (j = 0; j < BUFFER_SIZE; j++) {printf(" %d", buffer[j]);}printf("\n\n");pthread_cond_signal(&empty);pthread_mutex_unlock(&mutex);}return NULL;
}int main() {pthread_t prod_tid, cons_tid;pthread_create(&prod_tid, NULL, producer, NULL);pthread_create(&cons_tid, NULL, consumer, NULL);pthread_join(prod_tid, NULL);pthread_join(cons_tid, NULL);return 0;
}