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time: add update_monotonic to RateEstimator

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update_monotonic does not reset the counter if a new count is smaller than
earlier counts.  Useful when consuming an unsorted stream of eveent counts.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2018-01-28 23:08:50 -05:00
parent d367c6364c
commit 2aacdcd95f
2 changed files with 14 additions and 0 deletions
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11
lib/time.cc
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@ -188,6 +188,17 @@ namespace crucible {
return update_unlocked(new_count);
}
void
RateEstimator::update_monotonic(uint64_t new_count)
{
unique_lock<mutex> lock(m_mutex);
if (m_last_count == numeric_limits<uint64_t>::max() || new_count > m_last_count) {
return update_unlocked(new_count);
} else {
return update_unlocked(m_last_count);
}
}
uint64_t
RateEstimator::count() const
{