88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
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//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_DETAIL_TIMEPOINT_TO_TIMESPEC_HPP
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#define BOOST_INTERPROCESS_DETAIL_TIMEPOINT_TO_TIMESPEC_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/interprocess/detail/mpl.hpp>
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#include <boost/interprocess/detail/type_traits.hpp>
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#include <boost/interprocess/detail/timed_utils.hpp>
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namespace boost {
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namespace interprocess {
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namespace ipcdetail {
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template<class TimePoint>
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inline timespec timepoint_to_timespec ( const TimePoint &tm
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, typename enable_if_ptime<TimePoint>::type * = 0)
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{
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typedef typename TimePoint::date_type date_type;
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typedef typename TimePoint::time_duration_type time_duration_type;
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const TimePoint epoch(date_type(1970,1,1));
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//Avoid negative absolute times
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time_duration_type duration = (tm <= epoch) ? time_duration_type(epoch - epoch)
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: time_duration_type(tm - epoch);
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timespec ts;
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ts.tv_sec = static_cast<time_t>(duration.total_seconds());
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ts.tv_nsec = static_cast<long>(duration.total_nanoseconds() % 1000000000);
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return ts;
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}
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inline timespec timepoint_to_timespec (const ustime &tm)
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{
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timespec ts;
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ts.tv_sec = static_cast<time_t>(tm.get_microsecs()/1000000u);
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ts.tv_nsec = static_cast<long>((tm.get_microsecs()%1000000u)*1000u);
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return ts;
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}
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template<class TimePoint>
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inline timespec timepoint_to_timespec ( const TimePoint &tm
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, typename enable_if_time_point<TimePoint>::type * = 0)
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{
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typedef typename TimePoint::duration duration_t;
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duration_t d(tm.time_since_epoch());
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timespec ts;
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BOOST_IF_CONSTEXPR(duration_t::period::num == 1 && duration_t::period::den == 1000000000)
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{
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ts.tv_sec = static_cast<time_t>(d.count()/duration_t::period::den);
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ts.tv_nsec = static_cast<long>(d.count()%duration_t::period::den);
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}
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else
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{
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const double factor = double(duration_t::period::num)/double(duration_t::period::den);
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const double res = d.count()*factor;
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ts.tv_sec = static_cast<time_t>(res);
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ts.tv_nsec = static_cast<long>(res - double(ts.tv_sec));
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}
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return ts;
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}
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} //namespace ipcdetail {
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} //namespace interprocess {
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} //namespace boost {
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#endif //ifndef BOOST_INTERPROCESS_DETAIL_TIMEPOINT_TO_TIMESPEC_HPP
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