cdtime_t latency_counter_get_percentile (latency_counter_t *lc,
double percent)
{
double percent_upper;
double percent_lower;
double ms_upper;
double ms_lower;
double ms_interpolated;
int sum;
size_t i;
if ((lc == NULL) || (lc->num == 0) || !((percent > 0.0) && (percent < 100.0)))
return (0);
/* Find index i so that at least "percent" events are within i+1 ms. */
percent_upper = 0.0;
percent_lower = 0.0;
sum = 0;
for (i = 0; i < LATENCY_HISTOGRAM_SIZE; i++)
{
percent_lower = percent_upper;
sum += lc->histogram[i];
if (sum == 0)
percent_upper = 0.0;
else
percent_upper = 100.0 * ((double) sum) / ((double) lc->num);
if (percent_upper >= percent)
break;
}
if (i >= LATENCY_HISTOGRAM_SIZE)
return (0);
assert (percent_upper >= percent);
assert (percent_lower < percent);
ms_upper = (double) (i + 1);
ms_lower = (double) i;
if (i == 0)
return (MS_TO_CDTIME_T (ms_upper));
ms_interpolated = (((percent_upper - percent) * ms_lower)
+ ((percent - percent_lower) * ms_upper))
/ (percent_upper - percent_lower);
return (MS_TO_CDTIME_T (ms_interpolated));
} /* }}} cdtime_t latency_counter_get_percentile */
static int statsd_handle_timer (char const *name, /* {{{ */
char const *value_str,
char const *extra)
{
statsd_metric_t *metric;
value_t value_ms;
value_t scale;
cdtime_t value;
int status;
if ((extra != NULL) && (extra[0] != '@'))
return (-1);
scale.gauge = 1.0;
if (extra != NULL)
{
status = statsd_parse_value (extra + 1, &scale);
if (status != 0)
return (status);
if (!isfinite (scale.gauge) || (scale.gauge <= 0.0) || (scale.gauge > 1.0))
return (-1);
}
value_ms.derive = 0;
status = statsd_parse_value (value_str, &value_ms);
if (status != 0)
return (status);
value = MS_TO_CDTIME_T (value_ms.gauge / scale.gauge);
pthread_mutex_lock (&metrics_lock);
metric = statsd_metric_lookup_unsafe (name, STATSD_TIMER);
if (metric == NULL)
{
pthread_mutex_unlock (&metrics_lock);
return (-1);
}
if (metric->latency == NULL)
metric->latency = latency_counter_create ();
if (metric->latency == NULL)
{
pthread_mutex_unlock (&metrics_lock);
return (-1);
}
latency_counter_add (metric->latency, value);
metric->updates_num++;
pthread_mutex_unlock (&metrics_lock);
return (0);
} /* }}} int statsd_handle_timer */
/**
* Non blocking pause for the thread.
*/
static int cgps_thread_pause(cdtime_t pTime)
{
cdtime_t now;
now = cdtime ();
struct timespec pause_th;
CDTIME_T_TO_TIMESPEC (MS_TO_CDTIME_T(10), &pause_th);
while (CGPS_TRUE)
{
if ( (cdtime () - now) > pTime )
{
break;
}
pthread_mutex_lock (&cgps_thread_lock);
if (cgps_thread_shutdown == CGPS_TRUE)
{
return CGPS_FALSE;
}
pthread_mutex_unlock (&cgps_thread_lock);
nanosleep (&pause_th, NULL);
}
return CGPS_TRUE;
}
