libcruft-util/time.cpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
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*/
#include "time.hpp"
#include "debug.hpp"
#include "log.hpp"
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#include "platform.hpp"
#include "types/casts.hpp"
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using namespace util;
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// ----------------------------------------------------------------------------
static const uint64_t SECOND = 1000000000UL;
static const uint64_t MILLISECOND = 1000000UL;
// ----------------------------------------------------------------------------
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#ifdef PLATFORM_WIN32
#include <windows.h>
uint64_t
util::nanoseconds (void) {
LARGE_INTEGER freq, count;
QueryPerformanceFrequency (&freq);
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QueryPerformanceCounter (&count);
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return ((double)count.QuadPart / freq.QuadPart) * SECOND;
}
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void
util::sleep (uint64_t ns) {
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Sleep (ns / MILLISECOND);
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}
#else
#include <ctime>
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uint64_t
util::nanoseconds (void) {
struct timespec t;
clock_gettime (CLOCK_MONOTONIC, &t);
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CHECK_GT (t.tv_sec, 0);
CHECK_GT (t.tv_nsec, 0);
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return static_cast<uint64_t> (t.tv_sec) * SECOND + static_cast<uint64_t> (t.tv_nsec);
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}
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void
util::sleep (uint64_t ns) {
struct timespec req, rem;
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req.tv_sec = sign_cast<time_t> (ns / SECOND);
req.tv_nsec = sign_cast<long> (ns % SECOND);
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while (nanosleep (&req, &rem)) {
req = rem;
}
}
#endif
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// ----------------------------------------------------------------------------
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delta_clock::delta_clock ():
time { util::nanoseconds (), util::nanoseconds () }
{ ; }
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float
delta_clock::seconds (void) {
time.prev = time.curr;
time.curr = nanoseconds ();
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return (time.curr - time.prev) / static_cast<float> (SECOND);
}
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// ----------------------------------------------------------------------------
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util::period_query::period_query (float seconds) {
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m_time.start = nanoseconds ();
m_time.period = static_cast<uint64_t> (seconds * SECOND);
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}
bool
util::period_query::poll (void) {
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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// ----------------------------------------------------------------------------
util::rate_limiter::rate_limiter (unsigned rate):
m_last (nanoseconds ()),
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m_target (SECOND / rate)
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{ ; }
void
util::rate_limiter::poll (void) {
uint64_t now = nanoseconds ();
uint64_t total = now - m_last;
if (total < m_target)
sleep (m_target - total);
m_last = now;
}
// ----------------------------------------------------------------------------
util::polled_duration::polled_duration (std::string name, uint64_t interval):
m_name (name),
m_interval (interval),
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m_next (nanoseconds () + interval)
{ ; }
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void
util::polled_duration::start (void) {
m_last = nanoseconds ();
}
void
util::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) {
LOG_DEBUG ("timing: '%s'. %s", m_name, m_series);
m_series.reset ();
m_next = now + m_interval;
}
}