159 lines
3.7 KiB
C++
159 lines
3.7 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
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*/
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#include "time.hpp"
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#include "debug.hpp"
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#include "log.hpp"
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#include "platform.hpp"
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#include "types/casts.hpp"
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using namespace util;
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// ----------------------------------------------------------------------------
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static const uint64_t SECOND = 1000000000UL;
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static const uint64_t MILLISECOND = 1000000UL;
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// ----------------------------------------------------------------------------
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#ifdef PLATFORM_WIN32
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#include <windows.h>
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uint64_t
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util::nanoseconds (void) {
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LARGE_INTEGER freq, count;
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QueryPerformanceFrequency (&freq);
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QueryPerformanceCounter (&count);
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return ((double)count.QuadPart / freq.QuadPart) * SECOND;
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}
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void
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util::sleep (uint64_t ns) {
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Sleep (ns / MILLISECOND);
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}
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#else
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#include <ctime>
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uint64_t
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util::nanoseconds (void) {
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struct timespec t;
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clock_gettime (CLOCK_REALTIME, &t);
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CHECK_SOFT (t.tv_sec > 0);
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CHECK_SOFT (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
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util::sleep (uint64_t ns) {
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struct timespec req, rem;
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req.tv_sec = sign_cast<time_t> (ns / SECOND);
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req.tv_nsec = sign_cast<long> (ns % SECOND);
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while (nanosleep (&req, &rem)) {
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req = rem;
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}
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}
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#endif
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// ----------------------------------------------------------------------------
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delta_clock::delta_clock():
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time { util::nanoseconds (), util::nanoseconds () }
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{ ; }
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double
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delta_clock::seconds (void) {
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time.prev = time.curr;
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time.curr = nanoseconds ();
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return (time.curr - time.prev) / static_cast<double> (SECOND);
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}
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// ----------------------------------------------------------------------------
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util::period_query::period_query (double seconds) {
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m_time.start = nanoseconds ();
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m_time.period = seconds * SECOND;
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}
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bool
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util::period_query::poll (void) {
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uint64_t now = nanoseconds ();
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uint64_t diff = now - m_time.start;
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if (diff < m_time.period)
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return false;
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m_time.start += diff % m_time.period;
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return true;
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}
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// ----------------------------------------------------------------------------
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util::rate_limiter::rate_limiter (unsigned rate):
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m_last (nanoseconds ()),
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m_target (static_cast<double> (SECOND) / rate)
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{ ; }
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void
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util::rate_limiter::poll (void) {
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uint64_t now = nanoseconds ();
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uint64_t total = now - m_last;
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if (total < m_target)
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sleep (m_target - total);
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m_last = now;
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}
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// ----------------------------------------------------------------------------
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util::polled_duration::polled_duration (std::string name, uint64_t interval):
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m_name (name),
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m_interval (interval),
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m_next (nanoseconds () + interval)
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{ ; }
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void
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util::polled_duration::start (void) {
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m_last = nanoseconds ();
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}
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void
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util::polled_duration::stop (void) {
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uint64_t now = nanoseconds ();
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uint64_t dt = now - m_last;
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m_series.add (dt / MILLISECOND);
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if (m_next < now) {
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LOG_DEBUG ("timing: '%s'. %s", m_name, m_series);
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m_series.reset ();
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m_next = now + m_interval;
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}
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}
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