91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
/*
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* \brief A duration type for both highly precise and long durations
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* \author Martin Stein
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* \date 2017-03-21
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*/
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/*
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* Copyright (C) 2016-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <os/duration.h>
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using namespace Genode;
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void Duration::_raise_hours(unsigned long hours)
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{
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unsigned long const old_hours = _hours;
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_hours += hours;
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if (_hours < old_hours) {
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throw Overflow(); }
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}
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void Duration::_add_us_less_than_an_hour(unsigned long us)
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{
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unsigned long const us_until_next_hr =
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(unsigned long)US_PER_HOUR - _microseconds;
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if (us >= us_until_next_hr) {
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_raise_hours(1);
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_microseconds = us - us_until_next_hr;
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} else {
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_microseconds += us;
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}
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}
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void Duration::add(Microseconds us)
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{
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/* filter out hours if any */
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if (us.value >= (unsigned long)US_PER_HOUR) {
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unsigned long const hours = us.value / US_PER_HOUR;
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_raise_hours(hours);
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us.value -= hours * US_PER_HOUR;
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}
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/* add the rest */
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_add_us_less_than_an_hour(us.value);
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}
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void Duration::add(Milliseconds ms)
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{
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/* filter out hours if any */
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if (ms.value >= MS_PER_HOUR) {
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unsigned long const hours = ms.value / MS_PER_HOUR;
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_raise_hours(hours);
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ms.value -= hours * MS_PER_HOUR;
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}
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/* add the rest as microseconds value */
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_add_us_less_than_an_hour(ms.value * US_PER_MS);
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}
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bool Duration::less_than(Duration &other) const
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{
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if (_hours != other._hours) {
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return _hours < other._hours; }
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if (_microseconds != other._microseconds) {
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return _microseconds < other._microseconds; }
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return false;
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}
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Microseconds Duration::trunc_to_plain_us() const
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{
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return Microseconds(_microseconds + (_hours ? _hours * US_PER_HOUR : 0));
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}
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Milliseconds Duration::trunc_to_plain_ms() const
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{
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return Milliseconds(trunc_to_plain_us().value / 1000);
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}
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