生产者消费者算法

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

#define PRODUCER 5
#define CONSUMER 5
#define BUFFER 10

sem_t empty,full;
pthread_mutex_t mutex;
int buffer[BUFFER];
int producer_id=0,consumer_id=0;
int index_in,index_out;

void print()
{
    printf("Buffer:\n");
    for(int i=0;i<BUFFER;i++)
    {
        printf("___");
    }
    printf("\n");
    for(int i=0;i<BUFFER;i++)
    {
        printf("|%d|",buffer[i]);
    }
    printf("\n");
    for(int i=0;i<BUFFER;i++)
    {
        printf("———");
    }
    printf("\n");
    sleep(3);
}

void *Producer()
{
    int id=++producer_id;
    while(1)
    {       
        sem_wait(&empty);
        pthread_mutex_lock(&mutex);
        index_in=index_in%BUFFER;
        printf("producer %d in %d.\n",id,index_in);
        buffer[index_in]=1;
        print();
        index_in++;
        pthread_mutex_unlock(&mutex);
        sem_post(&full);
    }
}

void *Consumer()
{
    int id=++consumer_id;
    while(1)
    {   
        sem_wait(&full);
        pthread_mutex_lock(&mutex);
        index_out=index_out%BUFFER;
        printf("consumer %d in %d.\n",id,index_out);
        buffer[index_out]=0;
        print();
        index_out++;
        pthread_mutex_unlock(&mutex);
        sem_post(&empty);
    }
}

int main()
{
    int thread[15];
    pthread_t producer[PRODUCER];
    pthread_t consumer[CONSUMER];
    int inite1=sem_init(&empty,0,BUFFER);
    int inite2=sem_init(&full,0,0);
    int inite3=pthread_mutex_init(&mutex,NULL);
    if(inite1&&inite2)
    {
        printf("sem initlialize failed \n");
        exit(1);
    }
    if(inite3)
    {
        printf("mutex initlialize failed \n");
        exit(1);
    }
    for(int i=0;i<PRODUCER;i++)
    {
        thread[i]=pthread_create(&producer[i],NULL,Producer,NULL);
        if(thread[i]!=0)
        {
            printf("producer %d fail to create \n",i);
            exit(0);
        }

    }
    for(int i=0;i<CONSUMER;i++)
    {
        thread[i]=pthread_create(&consumer[i],NULL,Consumer,NULL);
        if(thread[i]!=0)
        {
            printf("consumer %d fail to create \n",i);
            exit(1);
        }
    }
    for(int i=0;i<PRODUCER;i++)
    {
        pthread_join(producer[i],NULL);
    }
    for(int i=0;i<CONSUMER;i++)
    {
        pthread_join(consumer[i],NULL);

    }

    return 0;
}