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 = ;
 int Consumer_id = ;
 int NowNumOfProduce = ;
 void *Producer(void *arg)    //the thread of producer
 {
     int id = Producer_id++;
     while()
     {
         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 \n",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 *));
 }

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

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

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

     int temp3 = pthread_mutex_init(&Mutex,NULL);

     if(temp3!=)
     {
         printf("Mutex init failed \n");
         exit();
     }

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

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

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

     return ;
 }

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。