Chris@16: //  win/chrono.cpp  --------------------------------------------------------------//
Chris@16: 
Chris@16: //  Copyright Beman Dawes 2008
Chris@16: //  Copyright 2009-2010 Vicente J. Botet Escriba
Chris@16: 
Chris@16: //  Distributed under the Boost Software License, Version 1.0.
Chris@16: //  See http://www.boost.org/LICENSE_1_0.txt
Chris@16: 
Chris@16: //----------------------------------------------------------------------------//
Chris@16: //                                Windows                                     //
Chris@16: //----------------------------------------------------------------------------//
Chris@16: #ifndef BOOST_CHRONO_DETAIL_INLINED_WIN_CHRONO_HPP
Chris@16: #define BOOST_CHRONO_DETAIL_INLINED_WIN_CHRONO_HPP
Chris@16: 
Chris@16: #include <boost/detail/winapi/time.hpp>
Chris@16: #include <boost/detail/winapi/timers.hpp>
Chris@16: #include <boost/detail/winapi/GetLastError.hpp>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: namespace chrono
Chris@16: {
Chris@16: namespace chrono_detail
Chris@16: {
Chris@16: 
Chris@16:   BOOST_CHRONO_INLINE double get_nanosecs_per_tic() BOOST_NOEXCEPT
Chris@16:   {
Chris@16:       boost::detail::winapi::LARGE_INTEGER_ freq;
Chris@16:       if ( !boost::detail::winapi::QueryPerformanceFrequency( &freq ) )
Chris@16:           return 0.0L;
Chris@16:       return double(1000000000.0L / freq.QuadPart);
Chris@16:   }
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16:   steady_clock::time_point steady_clock::now() BOOST_NOEXCEPT
Chris@16:   {
Chris@101:     double nanosecs_per_tic = chrono_detail::get_nanosecs_per_tic();
Chris@16: 
Chris@16:     boost::detail::winapi::LARGE_INTEGER_ pcount;
Chris@101:     if ( nanosecs_per_tic <= 0.0L )
Chris@16:     {
Chris@101:       BOOST_ASSERT(0 && "Boost::Chrono - get_nanosecs_per_tic Internal Error");
Chris@16:       return steady_clock::time_point();
Chris@16:     }
Chris@101:     unsigned times=0;
Chris@101:     while ( ! boost::detail::winapi::QueryPerformanceCounter( &pcount ) )
Chris@101:     {
Chris@101:       if ( ++times > 3 )
Chris@101:       {
Chris@101:         BOOST_ASSERT(0 && "Boost::Chrono - QueryPerformanceCounter Internal Error");
Chris@101:         return steady_clock::time_point();
Chris@101:       }
Chris@101:     }
Chris@16: 
Chris@16:     return steady_clock::time_point(steady_clock::duration(
Chris@16:       static_cast<steady_clock::rep>((nanosecs_per_tic) * pcount.QuadPart)));
Chris@16:   }
Chris@16: 
Chris@16: 
Chris@16: #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
Chris@16:   steady_clock::time_point steady_clock::now( system::error_code & ec )
Chris@16:   {
Chris@101:     double nanosecs_per_tic = chrono_detail::get_nanosecs_per_tic();
Chris@16: 
Chris@16:     boost::detail::winapi::LARGE_INTEGER_ pcount;
Chris@16:     if ( (nanosecs_per_tic <= 0.0L)
Chris@16:             || (!boost::detail::winapi::QueryPerformanceCounter( &pcount )) )
Chris@16:     {
Chris@16:         boost::detail::winapi::DWORD_ cause =
Chris@16:             ((nanosecs_per_tic <= 0.0L)
Chris@16:                     ? ERROR_NOT_SUPPORTED
Chris@16:                     : boost::detail::winapi::GetLastError());
Chris@16:         if (BOOST_CHRONO_IS_THROWS(ec)) {
Chris@16:             boost::throw_exception(
Chris@16:                     system::system_error(
Chris@16:                             cause,
Chris@16:                             BOOST_CHRONO_SYSTEM_CATEGORY,
Chris@16:                             "chrono::steady_clock" ));
Chris@16:         }
Chris@16:         else
Chris@16:         {
Chris@16:             ec.assign( cause, BOOST_CHRONO_SYSTEM_CATEGORY );
Chris@16:             return steady_clock::time_point(duration(0));
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16:     if (!BOOST_CHRONO_IS_THROWS(ec))
Chris@16:     {
Chris@16:         ec.clear();
Chris@16:     }
Chris@16:     return time_point(duration(
Chris@16:       static_cast<steady_clock::rep>(nanosecs_per_tic * pcount.QuadPart)));
Chris@16:   }
Chris@16: #endif
Chris@16: 
Chris@16:   BOOST_CHRONO_INLINE
Chris@16:   system_clock::time_point system_clock::now() BOOST_NOEXCEPT
Chris@16:   {
Chris@16:     boost::detail::winapi::FILETIME_ ft;
Chris@16:     boost::detail::winapi::GetSystemTimeAsFileTime( &ft );  // never fails
Chris@16:     return system_clock::time_point(
Chris@16:       system_clock::duration(
Chris@16:         ((static_cast<__int64>( ft.dwHighDateTime ) << 32) | ft.dwLowDateTime)
Chris@101:        - 116444736000000000LL
Chris@101:        //- (134775LL*864000000000LL)
Chris@16:       )
Chris@16:     );
Chris@16:   }
Chris@16: 
Chris@16: #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
Chris@16:   BOOST_CHRONO_INLINE
Chris@16:   system_clock::time_point system_clock::now( system::error_code & ec )
Chris@16:   {
Chris@16:     boost::detail::winapi::FILETIME_ ft;
Chris@16:     boost::detail::winapi::GetSystemTimeAsFileTime( &ft );  // never fails
Chris@16:     if (!BOOST_CHRONO_IS_THROWS(ec))
Chris@16:     {
Chris@16:         ec.clear();
Chris@16:     }
Chris@16:     return system_clock::time_point(
Chris@16:       system_clock::duration(
Chris@16:        ((static_cast<__int64>( ft.dwHighDateTime ) << 32) | ft.dwLowDateTime)
Chris@101:        - 116444736000000000LL
Chris@101:        //- (134775LL*864000000000LL)
Chris@16:        ));
Chris@16:   }
Chris@16: #endif
Chris@16: 
Chris@16:   BOOST_CHRONO_INLINE
Chris@16:   std::time_t system_clock::to_time_t(const system_clock::time_point& t) BOOST_NOEXCEPT
Chris@16:   {
Chris@16:       __int64 temp = t.time_since_epoch().count();
Chris@16:       temp /= 10000000;
Chris@16:       return static_cast<std::time_t>( temp );
Chris@16:   }
Chris@16: 
Chris@16:   BOOST_CHRONO_INLINE
Chris@16:   system_clock::time_point system_clock::from_time_t(std::time_t t) BOOST_NOEXCEPT
Chris@16:   {
Chris@16:       __int64 temp = t;
Chris@16:       temp *= 10000000;
Chris@16:       return time_point(duration(temp));
Chris@16:   }
Chris@16: 
Chris@16: }  // namespace chrono
Chris@16: }  // namespace boost
Chris@16: 
Chris@16: #endif