151 lines
4.6 KiB
Plaintext
151 lines
4.6 KiB
Plaintext
// win/chrono.cpp --------------------------------------------------------------//
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// Copyright Beman Dawes 2008
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// Copyright 2009-2010 Vicente J. Botet Escriba
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt
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//----------------------------------------------------------------------------//
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// Windows //
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//----------------------------------------------------------------------------//
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#ifndef BOOST_CHRONO_DETAIL_INLINED_WIN_CHRONO_HPP
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#define BOOST_CHRONO_DETAIL_INLINED_WIN_CHRONO_HPP
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#include <boost/detail/winapi/time.hpp>
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#include <boost/detail/winapi/timers.hpp>
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#include <boost/detail/winapi/get_last_error.hpp>
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#include <boost/assert.hpp>
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namespace boost
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{
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namespace chrono
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{
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namespace chrono_detail
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{
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BOOST_CHRONO_INLINE double get_nanosecs_per_tic() BOOST_NOEXCEPT
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{
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boost::detail::winapi::LARGE_INTEGER_ freq;
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if ( !boost::detail::winapi::QueryPerformanceFrequency( &freq ) )
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return 0.0L;
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return double(1000000000.0L / freq.QuadPart);
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}
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}
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steady_clock::time_point steady_clock::now() BOOST_NOEXCEPT
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{
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double nanosecs_per_tic = chrono_detail::get_nanosecs_per_tic();
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boost::detail::winapi::LARGE_INTEGER_ pcount;
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if ( nanosecs_per_tic <= 0.0L )
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{
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BOOST_ASSERT(0 && "Boost::Chrono - get_nanosecs_per_tic Internal Error");
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return steady_clock::time_point();
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}
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unsigned times=0;
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while ( ! boost::detail::winapi::QueryPerformanceCounter( &pcount ) )
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{
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if ( ++times > 3 )
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{
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BOOST_ASSERT(0 && "Boost::Chrono - QueryPerformanceCounter Internal Error");
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return steady_clock::time_point();
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}
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}
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return steady_clock::time_point(steady_clock::duration(
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static_cast<steady_clock::rep>((nanosecs_per_tic) * pcount.QuadPart)));
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}
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#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
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steady_clock::time_point steady_clock::now( system::error_code & ec )
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{
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double nanosecs_per_tic = chrono_detail::get_nanosecs_per_tic();
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boost::detail::winapi::LARGE_INTEGER_ pcount;
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if ( (nanosecs_per_tic <= 0.0L)
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|| (!boost::detail::winapi::QueryPerformanceCounter( &pcount )) )
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{
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boost::detail::winapi::DWORD_ cause =
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((nanosecs_per_tic <= 0.0L)
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? ERROR_NOT_SUPPORTED
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: boost::detail::winapi::GetLastError());
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if (BOOST_CHRONO_IS_THROWS(ec)) {
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boost::throw_exception(
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system::system_error(
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cause,
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BOOST_CHRONO_SYSTEM_CATEGORY,
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"chrono::steady_clock" ));
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}
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else
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{
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ec.assign( cause, BOOST_CHRONO_SYSTEM_CATEGORY );
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return steady_clock::time_point(duration(0));
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}
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}
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if (!BOOST_CHRONO_IS_THROWS(ec))
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{
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ec.clear();
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}
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return time_point(duration(
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static_cast<steady_clock::rep>(nanosecs_per_tic * pcount.QuadPart)));
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}
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#endif
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BOOST_CHRONO_INLINE
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system_clock::time_point system_clock::now() BOOST_NOEXCEPT
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{
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boost::detail::winapi::FILETIME_ ft;
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boost::detail::winapi::GetSystemTimeAsFileTime( &ft ); // never fails
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return system_clock::time_point(
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system_clock::duration(
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((static_cast<__int64>( ft.dwHighDateTime ) << 32) | ft.dwLowDateTime)
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- 116444736000000000LL
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//- (134775LL*864000000000LL)
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)
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);
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}
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#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
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BOOST_CHRONO_INLINE
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system_clock::time_point system_clock::now( system::error_code & ec )
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{
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boost::detail::winapi::FILETIME_ ft;
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boost::detail::winapi::GetSystemTimeAsFileTime( &ft ); // never fails
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if (!BOOST_CHRONO_IS_THROWS(ec))
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{
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ec.clear();
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}
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return system_clock::time_point(
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system_clock::duration(
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((static_cast<__int64>( ft.dwHighDateTime ) << 32) | ft.dwLowDateTime)
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- 116444736000000000LL
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//- (134775LL*864000000000LL)
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));
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}
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#endif
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BOOST_CHRONO_INLINE
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std::time_t system_clock::to_time_t(const system_clock::time_point& t) BOOST_NOEXCEPT
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{
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__int64 temp = t.time_since_epoch().count();
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temp /= 10000000;
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return static_cast<std::time_t>( temp );
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}
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BOOST_CHRONO_INLINE
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system_clock::time_point system_clock::from_time_t(std::time_t t) BOOST_NOEXCEPT
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{
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__int64 temp = t;
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temp *= 10000000;
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return time_point(duration(temp));
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}
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} // namespace chrono
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} // namespace boost
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#endif
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