73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
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/**
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* @file tmv.h
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* @brief Implements an abstract time value type.
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* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef HAVE_TMV_H
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#define HAVE_TMV_H
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#include "ddt.h"
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#include "pdt.h"
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#define NS_PER_SEC 1000000000LL
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/**
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* We implement the time value as a 64 bit signed integer containing
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* nanoseconds. Using this representation, we could really spare the
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* arithmetic functions such as @ref tmv_add() and the like, and just
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* use plain old math operators in the code.
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*
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* However, we are going to be a bit pendandic here and enforce the
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* use of the these functions, so that we can easily upgrade the code
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* to a finer representation later on. In that way, we can make use of
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* the fractional nanosecond parts of the correction fields, if and
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* when people start asking for them.
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*/
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typedef int64_t tmv_t;
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static inline tmv_t tmv_add(tmv_t a, tmv_t b)
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{
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return a + b;
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}
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static inline tmv_t tmv_div(tmv_t a, int divisor)
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{
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return a / divisor;
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}
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static inline tmv_t tmv_sub(tmv_t a, tmv_t b)
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{
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return a - b;
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}
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static inline tmv_t correction_to_tmv(Integer64 c)
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{
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return c >> 16;
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}
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static inline tmv_t timespec_to_tmv(struct timespec ts)
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{
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return ts.tv_sec * NS_PER_SEC + ts.tv_nsec;
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}
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static inline tmv_t timestamp_to_tmv(struct timestamp ts)
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{
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return ts.sec * NS_PER_SEC + ts.nsec;
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}
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#endif
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