#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(){
    
}