68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/*
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RealClock - convenience front-end to access the system clock
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Copyright (C) Lumiera.org
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2012, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file real-clock.cpp
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** Implementation of simplified access to the current wall clock time.
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**
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** @todo just a rough draft as of 2012 / 2017
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** @todo the idea was that the vault has elaborate knowledge about
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** timings and time progression; upper layers should thus be able
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** to fulfil their timing needs by querying the vault layer
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*/
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#include "vault/real-clock.hpp"
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#include <ctime>
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using lib::time::FSecs;
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namespace vault {
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#define MICRO_TICS_PER_NANOSECOND (1000*1000*1000 / TimeValue::SCALE)
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/** events during the last ms are considered "recent" for the purpose of testing */
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const Offset RealClock::CONSIDERED_RECENT{FSecs {1,1000}};
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TimeValue
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RealClock::_readSystemTime()
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{
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timespec now;
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clock_gettime(CLOCK_REALTIME, &now);
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////////////////////////////////////////////TODO shouldn't that be CLOCK_MONOTONIC ?
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////////////////////////////////////////////TODO (what happens on ntp adjustments?)
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////////////////////////////////////////////TICKET #886
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gavl_time_t ticksSince1970 = now.tv_sec * TimeValue::SCALE
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+ now.tv_nsec / MICRO_TICS_PER_NANOSECOND;
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ENSURE (ticksSince1970 == _raw(TimeValue{ticksSince1970}));
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return TimeValue::buildRaw_(ticksSince1970); // bypassing the limit check
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}
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} // namespace vault
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