716532dd47
Users expect time switches to happen upon system clock times. Calculating the timeout for the next refresh of the shown time via the monotonic clock is wrong: The monotonic clock yields values based upon some arbitrary point in time which might be off a little bit to the system clock, a 'full' minute of the monotonic clock might be in the midst of a system clock minute.
63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
// FbTime.hh for FbTk - Fluxbox Toolkit
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// Copyright (c) 2012 Mathias Gumz (akira at fluxbox dot org)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#ifndef FBTK_FBTIME_HH
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#define FBTK_FBTIME_HH
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif // HAVE_CONFIG_H
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#ifdef HAVE_INTTYPES_H
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#include <inttypes.h>
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#endif // HAVE_INTTYPES_H
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namespace FbTk {
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// time in micro-seconds
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//
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// interesting links:
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//
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// http://www.python.org/dev/peps/pep-0418/#operating-system-time-functions
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// http://en.cppreference.com/w/cpp/chrono
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namespace FbTime {
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const uint64_t IN_MILLISECONDS = 1000L;
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const uint64_t IN_SECONDS = 1000L * IN_MILLISECONDS;
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const uint64_t IN_MINUTES = 60 * IN_SECONDS;
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uint64_t mono(); // point in time, always monotonic
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uint64_t system(); // system time, might jump (DST, leap seconds)
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// calculates the remaining microseconds from 'now' up to the
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// next full 'unit'
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inline uint64_t remainingNext(uint64_t now, uint64_t unit) {
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return (unit - (now % unit) - 1);
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}
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} // namespace FbTime
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} // namespace FbTk
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#endif // FBTK_TIME_HH
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