Programming

void *stage3(){
	
	int r;
	char file[] = "sample.txt";
	char *str;
	FILE *fd;
	fd = fopen(file,"r");
	
	while(1){
		
		r = random()%30000;
        usleep(r);
     
		sem_wait(&empty);
		pthread_mutex_lock(&mutex);
	
	    str=(char*)malloc(256*sizeof(char));
	    if(fgets(str,sizeof(str),fd)==NULL)
	    pthread_exit(NULL);
	    //printf("str = %s \n",str);
	         str[strlen(str)-1] = '\0';
	         buffer3[in] = str;
	         //printf("\n buffer3in[%d] = %s\n",in,buffer3[in]);
	         in = (in+1)%10;	           
	    pthread_mutex_unlock(&mutex);
	    sem_post(&full);		    	
	}
	printf("\n buffer3in[3] = %s\n",buffer3[3]);
	pthread_exit(NULL);
}