操作系統實驗——和尚打水問題

代碼在gcc運行

#include <stdio.h>  
#include <pthread.h>  
#include<semaphore.h>
#include<unistd.h>
sem_t empty, full, bucket;
pthread_mutex_t well, jar;
int jar_count = 0;
void *producer(void *arg) {
	while (1) {
		sleep(1);
		sem_wait(&empty);
		sem_wait(&bucket);
		pthread_mutex_lock(&well);
		printf("get water from well.");
		pthread_mutex_unlock(&well);
		pthread_mutex_lock(&jar);
		jar_count++;
		printf("put water in jar.the jar_count is %d\n", jar_count);
		pthread_mutex_unlock(&jar);
		sem_post(&full);
		sem_post(&bucket);
	}
}
void *consumer(void *arg) {
	while (1)
	{
		sleep(2);
		sem_wait(&full);
		sem_wait(&bucket);
		pthread_mutex_lock(&jar);
		jar_count--;
		printf("get water from jar.the jar_count is %d\n", jar_count);
		pthread_mutex_unlock(&jar);
		sem_post(&empty);
		sem_post(&bucket);
	}
}
int main(int argc, char *argv[]) {
	pthread_t thrd_producer, thrd_consumer;
	pthread_mutex_init(&well, NULL);
	pthread_mutex_init(&jar, NULL);
	sem_init(&empty, 0, 10);
	sem_init(&full, 0, 0);
	sem_init(&bucket, 0, 3);
	if (pthread_create(&thrd_producer, NULL, producer, NULL) != 0)
		printf("thread create failed.");
	if (pthread_create(&thrd_consumer, NULL, consumer, NULL) != 0)
		printf("thread create failed.");
	if (pthread_join(thrd_producer, NULL) != 0)
		printf(" wait thread failed.");
	if (pthread_join(thrd_consumer, NULL) != 0)
		printf(" wait thread failed.");
	sem_destroy(&full);
	sem_destroy(&empty);
	sem_destroy(&bucket);
	pthread_mutex_destroy(&well);
	pthread_mutex_destroy(&jar);
	return 0;
}