long page_faults()
{
long _page_faults;
if (lib$stat_timer(&5, &_page_faults)==SS$_NORMAL)
return(timer_initialized?_page_faults:-1);
return(-1);
}
long dio_count()
{
long _dio_count;
if (lib$stat_timer(&4, &_dio_count)==SS$_NORMAL)
return(timer_initialized?_dio_count:-1);
return(-1);
}
long cpu_time()
{
long _cputime;
if (lib$stat_timer(&2, &_cputime)==SS$_NORMAL)
return(timer_initialized?_cputime:-1);
return(-1);
}
char *elapsed_time()
{
static long tbuf[2];
if (lib$stat_timer(&1, tbuf)==SS$_NORMAL) {
if (!timer_initialized)
return(NULL);
return(asc_time(tbuf, 1));
}
return(NULL);
}
void q3(void)
{
int i = 0;
/* initialize the timer to keep track of customers time in shop */
time_in_shop = stat_timer();
/* initialize the counter to keep track of number of customers in the shop */
customer_in_shop = stat_counter();
/* initialize the counter to keep track of status of barber's chair*/
bchair_stat = stat_counter();
/* declaring the barber thread */
pthread_t barber;
/* creating the barber thread */
pthread_create(&barber, NULL, barber_thread, (void*) -1);
/* declaring the customer thread */
pthread_t cust;
for( i=0; i < cust_threads; i++)
{
/* creating the customer thread */
pthread_create(&cust , NULL, customer_thread, (void*) i);
}
wait_until_done();
/* average number of customers turned away */
float avg_cust = (float) cust_turned_away/total_cust_entered;
/* Average number of customers in the shop */
double avg_customer_in_shop = stat_count_mean(customer_in_shop);
/* Average time spent in the shop by a customer who does not find a full shop */
double avg_cust_time_shop = stat_timer_mean(time_in_shop);
/* Fraction of time someone is siting on the barber's chair */
double avg_bchair_stat = stat_count_mean(bchair_stat);
printf("Fraction of customer visits result in turning away due to a full shop = %f \n", avg_cust);
printf("Average time spent in the shop by a customer who does not find a full shop = %f \n", avg_cust_time_shop);
printf("Average number of customers in the shop = %f \n", avg_customer_in_shop);
printf("Fraction of time someone is siting on the barber's chair = %f \n", avg_bchair_stat);
}
