linux c 条件变量

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define BUFFER_SIZE 5

int buffer[BUFFER_SIZE];
int count = 0;

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond_full = PTHREAD_COND_INITIALIZER;
pthread_cond_t cond_empty = PTHREAD_COND_INITIALIZER;

void* producer(void* arg) {
    while (1) {
        int item = rand() % 100;
        pthread_mutex_lock(&mutex);
        while (count == BUFFER_SIZE) {
            pthread_cond_wait(&cond_full, &mutex);
        }
        buffer[count++] = item;
        printf("Produced: %d
", item);
        pthread_cond_signal(&cond_empty);
        pthread_mutex_unlock(&mutex);
        sleep(1);
    }
}

void* consumer(void* arg) {
    while (1) {
        pthread_mutex_lock(&mutex);
        while (count == 0) {
            pthread_cond_wait(&cond_empty, &mutex);
        }
        int item = buffer[--count];
        printf("Consumed: %d
", item);
        pthread_cond_signal(&cond_full);
        pthread_mutex_unlock(&mutex);
        sleep(1);
    }
}

int main() {
    pthread_t producer_thread, consumer_thread;
    pthread_create(&producer_thread, NULL, producer, NULL);
    pthread_create(&consumer_thread, NULL, consumer, NULL);
    pthread_join(producer_thread, NULL);
    pthread_join(consumer_thread, NULL);
    return 0;
}