C语言调用库函数实现生产者消费者问题

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

#define NumOf_Producer 5  //the max num of producer
#define NumOf_Consumer 10  //the max num of consumer
#define Maxnum 10  //  the max num of product
sem_t Empty_sem; //the goal of whether the num of product is null
sem_t Full_sem;  //the goal of whether the num of product is equal to Maxnum

pthread_mutex_t Mutex;  //the goal of whether someone use the buff

int Producer_id = 0;
int Consumer_id = 0;
int NowNumOfProduce = 0;
void *Producer(void *arg)    //the thread of producer
{
    int id = Producer_id++;
    while(1)
    {
        sleep(0.1);
        sem_wait(&Full_sem);   //when it comes to zero ,it means that the num of product is equal to Maxnum
        pthread_mutex_lock(&Mutex);  //lock the buff
        NowNumOfProduce++;
        printf("Producerthread %d product one,the num is:%d 
",id%NumOf_Producer,NowNumOfProduce);
        pthread_mutex_unlock(&Mutex);
        sem_post(&Empty_sem);   //when it comes to ten ,it means there are ten products can be used by consumer
    }

    return ((void *)0);
}

void *Consumer(void *arg)
{
    int id = Consumer_id++;
    while(1)
    {
        sleep(0.2);
        sem_wait(&Empty_sem);
        pthread_mutex_lock(&Mutex);
        NowNumOfProduce--;
        printf("Consumerthread %d use product one,the num is:%d 
",id%NumOf_Consumer,NowNumOfProduce);
        pthread_mutex_unlock(&Mutex);
        sem_post(&Full_sem);
    }
    return ((void *)0);
}

int main()
{
    pthread_t Con[NumOf_Consumer];
    pthread_t Pro[NumOf_Producer];

    int temp1 = sem_init(&Empty_sem,0,0);
    int temp2 = sem_init(&Full_sem,0,Maxnum);
    if(temp1&&temp2!=0)
    {
        printf("sem init failed 
");
        exit(1);
    }

    int temp3 = pthread_mutex_init(&Mutex,NULL);

    if(temp3!=0)
    {
        printf("Mutex init failed 
");
        exit(1);
    }

    for(int i=0 ;i<NumOf_Producer;i++)
    {
        int temp4 = pthread_create(&Pro[i],NULL,Producer,(void *)&i);
        if(temp4!=0)
        {
            printf("thread create failed !
");
            exit(1);
        }
    }

    for(int i=0;i<NumOf_Consumer;i++)
    {
        int temp5 = pthread_create(&Con[i],NULL,Consumer,(void *)&i);
        if(temp5!=0)
        {
            printf("thread create failed !
");
        }
        exit(1);
    }
    //destroy the thread
    for(int i=0;i<NumOf_Consumer;i++)
    {
           pthread_join(Con[i],NULL);
    }

    for(int i=0;i<NumOf_Producer;i++)
    {
        pthread_join(Pro[i],NULL);
    }

    return 0;
}

说明：unisted.h是用来调用sleep，pthread.h是linux系统下线程编程的库，semaphore.h是使用信号灯的函数库，至于那些初始化方法，wait方法，post等可以去查查的。如果在编译程序时候出现类似sem_t未定义等问题，需要设置一下link链接，找到linux系统下安装的lib库中的libpthread.so导入进去就好了。