libcruft-util/time.cpp

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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
* Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
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*/
#include "time.hpp"
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#include "log.hpp"
#include <chrono>
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using cruft::delta_clock;
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///////////////////////////////////////////////////////////////////////////////
static const uint64_t SECOND = 1'000'000'000UL;
static const uint64_t MILLISECOND = 1'000'000UL;
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///////////////////////////////////////////////////////////////////////////////
uintmax_t
cruft::nanoseconds (void)
{
return std::chrono::duration_cast<
std::chrono::duration<uintmax_t, std::nano>
> (
std::chrono::high_resolution_clock::now ().time_since_epoch ()
).count ();
}
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///////////////////////////////////////////////////////////////////////////////
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delta_clock::delta_clock ():
time { cruft::nanoseconds (), cruft::nanoseconds () }
{ ; }
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//-----------------------------------------------------------------------------
std::chrono::nanoseconds
delta_clock::dt (void)
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{
time.prev = time.curr;
time.curr = nanoseconds ();
return std::chrono::nanoseconds (time.curr - time.prev);
}
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///////////////////////////////////////////////////////////////////////////////
cruft::period_query::period_query (float seconds)
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{
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m_time.start = nanoseconds ();
m_time.period = static_cast<uint64_t> (seconds * SECOND);
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}
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//-----------------------------------------------------------------------------
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bool
cruft::period_query::poll (void)
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{
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uint64_t now = nanoseconds ();
uint64_t diff = now - m_time.start;
if (diff < m_time.period)
return false;
m_time.start += diff % m_time.period;
return true;
}
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///////////////////////////////////////////////////////////////////////////////
cruft::rate_limiter::rate_limiter (unsigned rate):
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m_last (nanoseconds ()),
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m_target (SECOND / rate)
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{ ; }
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//-----------------------------------------------------------------------------
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void
cruft::rate_limiter::poll (void)
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{
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uint64_t now = nanoseconds ();
uint64_t total = now - m_last;
if (total < m_target)
sleep (m_target - total);
m_last = now;
}
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///////////////////////////////////////////////////////////////////////////////
cruft::polled_duration::polled_duration (std::string name, uint64_t interval):
m_name (std::move (name)),
m_interval (interval),
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m_next (nanoseconds () + interval)
{ ; }
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//-----------------------------------------------------------------------------
void
cruft::polled_duration::start (void)
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{
m_last = nanoseconds ();
}
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//-----------------------------------------------------------------------------
void
cruft::polled_duration::stop (void) {
uint64_t now = nanoseconds ();
uint64_t dt = now - m_last;
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m_series.add (dt / MILLISECOND);
if (m_next < now) {
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LOG_DEBUG ("timing: '{:s}'. {:s}", m_name, m_series);
m_series.reset ();
m_next = now + m_interval;
}
}