# include <stdio.h>
# include <pthread.h>
# define BufferSize 10

void *Producer();
void *Consumer();

int BufferIndex=0;
char *BUFFER;

pthread_cond_t Buffer_Not_Full=PTHREAD_COND_INITIALIZER;
pthread_cond_t Buffer_Not_Empty=PTHREAD_COND_INITIALIZER;
pthread_mutex_t mVar=PTHREAD_MUTEX_INITIALIZER;

int main()
{    
    pthread_t ptid,ctid;
    
    BUFFER=(char *) malloc(sizeof(char) * BufferSize);            
    
    pthread_create(&ptid,NULL,Producer,NULL);
    pthread_create(&ctid,NULL,Consumer,NULL);
    
    pthread_join(ptid,NULL);
    pthread_join(ctid,NULL);
        
    
    return 0;
}

void *Producer()
{    
    for(;;)
    {
        pthread_mutex_lock(&mVar);
        if(BufferIndex==BufferSize)
        {                        
            pthread_cond_wait(&Buffer_Not_Full,&mVar);
        }                        
        BUFFER[BufferIndex++]='@';
        printf("Produce : %d \n",BufferIndex);
        pthread_mutex_unlock(&mVar);
        pthread_cond_signal(&Buffer_Not_Empty);        
    }    
    
}

void *Consumer()
{
    for(;;)
    {
        pthread_mutex_lock(&mVar);
        if(BufferIndex==-1)
        {            
            pthread_cond_wait(&Buffer_Not_Empty,&mVar);
        }                
        printf("Consume : %d \n",BufferIndex--);        
        pthread_mutex_unlock(&mVar);        
        pthread_cond_signal(&Buffer_Not_Full);                
    }    
}

/* Output 
[divyen@localhost pp-tw4]$ cc -o Prog08 -lpthread Prog08.c
[divyen@localhost pp-tw4]$ ./Prog08
Produce : 1
Produce : 2
Produce : 3
Produce : 4
Produce : 5
Produce : 6
Produce : 7
Produce : 8
Produce : 9
Produce : 10
Consume : 10
Consume : 9
Consume : 8
Consume : 7
Consume : 6
Consume : 5
Consume : 4
Consume : 3
Consume : 2
Consume : 1
Consume : 0
Produce : 0
Produce : 1
Produce : 2
Produce : 3
Produce : 4
Produce : 5
Produce : 6
Produce : 7
Produce : 8
Produce : 9
Produce : 10
Consume : 10
Consume : 9
Consume : 8
Consume : 7
Consume : 6
Consume : 5
Consume : 4
Consume : 3
Consume : 2
Consume : 1
Consume : 0
Produce : 0
Produce : 1

*/