#include <stdio.h>   
#include <stdlib.h>   
#include <pthread.h>   
#include <unistd.h>   
#include <sys/types.h>   
#include <semaphore.h>   
int n=10, in=0,out=0,buffer[10];
sem_t empty,full;
void* producer(void *arg){
    int tag= pthread_self()%100;
    int nextPro;
    srand(time(NULL)+tag);
    while(1){
        nextPro = rand()%97;
        sem_wait(&empty);
        buffer[in] = nextPro;
        printf("production:%d %d\n",nextPro,buffer[in]); 
usleep(1000*1000/20);
        in = (in+1)%n;
        sem_post(&full);
        usleep(1000*1000/2);
    }
} 
void* consumer(void *arg)  {
    int item;
    while(1){
        sem_wait(&full);
        item = buffer[out];
        sem_post(&empty);
        printf("consume:%d\n",buffer[out]);
        out = (out+1)%n;
        usleep(1000*1000/10);
    }
}
int main()  {  
	pthread_t tid[7];  
    //��ʼ��10��������
    sem_init( &empty, 0,10);
    sem_init( &full, 0,0);
    //pthread_create(&tid[0], NULL, producer, NULL); 
    for(int i=0;i<6;i++){
        pthread_create(&tid[i], NULL, producer,NULL); 
    }
	pthread_create(&tid[6], NULL, consumer, NULL);  
	for(int i = 0; i < 7; i++)  
		pthread_join(tid[i], NULL);      
	printf("main is over\n");
}