生产者消费者问题条件变量和信号量各自实现（C++）

#include
#include
#include
#include
#include
using namespace std;

queue buffer;
pthread_mutex_t mutex;
pthread_cond_t cond;

void* producer(void* arg)
{
    while(1){
        pthread_mutex_lock(&mutex);
        int id = rand() % 100;
        buffer.push(id);
        printf("生产者放入:%dn",id);
        pthread_cond_signal(&cond);
        pthread_mutex_unlock(&mutex);
        sleep(1);
    }
}

void* customer(void* arg)
{
    while(1){
        pthread_mutex_lock(&mutex);
        if(buffer.empty()){
            //阻塞条件：缓冲区为空时,释放互斥锁
            pthread_cond_wait(&cond,&mutex);
        }
        int ret = buffer.front();
        buffer.pop();
        printf("消费者取出:%dn",ret);
        pthread_mutex_unlock(&mutex);
    }
}

int main(int argc, const char* argv[])
{
    pthread_mutex_init(&mutex,nullptr);
    pthread_cond_init(&cond,nullptr);
    pthread_t p1,p2;
    
    pthread_create(&p1,nullptr,producer,nullptr);
    pthread_create(&p2,nullptr,customer,nullptr);

    pthread_join(p1,nullptr);
    pthread_join(p2,nullptr);

    pthread_mutex_destroy(&mutex);
    pthread_cond_destroy(&cond);
    return 0;
}

#include
#include
#include
#include
#include
using namespace std;

sem_t emptyBuffer;
sem_t fullBuffer;
pthread_mutex_t mutex;
queue buffer;

void *producer(void *arg){
    while(1){
        sem_wait(&emptyBuffer);
        pthread_mutex_lock(&mutex);
        int id = (rand() % 100);
        buffer.push(id);
        printf("生产者放入:%dn",id);
        pthread_mutex_unlock(&mutex);
        sem_post(&fullBuffer);
        sleep(1);
    }
}

void *customer(void *arg){
    while(1){
        sem_wait(&fullBuffer);
        pthread_mutex_lock(&mutex);
        int ret = buffer.front();
        buffer.pop();
        printf("消费者取出:%dn",ret);
        pthread_mutex_unlock(&mutex);
        sem_post(&emptyBuffer);
    }
}

int main(){
    pthread_mutex_init(&mutex,NULL);
    sem_init(&emptyBuffer,0,1);
    sem_init(&fullBuffer,0,0);

    pthread_t p1,p2;
    pthread_create(&p1,NULL,producer,NULL);
    pthread_create(&p2,NULL,customer,NULL);

    pthread_join(p1,NULL);
    pthread_join(p2,NULL);

    sem_destroy(&fullBuffer);
    sem_destroy(&emptyBuffer);
    pthread_mutex_destroy(&mutex);

}