Ichthyostega
48a829d544
effectively we rely in the micro tick timescale promoted by libGAVL, but it seems indicated to introduce our own constant definition. And also clarify some comments and tests. (this changeset does not change any values or functionality)
63 lines
2.1 KiB
C++
63 lines
2.1 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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namespace vault {
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#define MICRO_TICS_PER_NANOSECOND (1000*1000*1000 / TimeValue::SCALE)
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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 == Time::limited (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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