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// win/chrono.cpp --------------------------------------------------------------//
// Copyright Beman Dawes 2008
// Copyright 2009-2010 Vicente J. Botet Escriba
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
//----------------------------------------------------------------------------//
// Windows //
//----------------------------------------------------------------------------//
#ifndef BOOST_CHRONO_DETAIL_INLINED_WIN_CHRONO_HPP
#define BOOST_CHRONO_DETAIL_INLINED_WIN_CHRONO_HPP
#include <boost/detail/win/time.hpp>
#include <boost/detail/win/timers.hpp>
#include <boost/detail/win/GetLastError.hpp>
namespace boost
{
namespace chrono
{
namespace chrono_detail
{
BOOST_CHRONO_INLINE double get_nanosecs_per_tic() BOOST_NOEXCEPT
{
boost::detail::win32::LARGE_INTEGER_ freq;
if ( !boost::detail::win32::QueryPerformanceFrequency( &freq ) )
return 0.0L;
return double(1000000000.0L / freq.QuadPart);
}
}
steady_clock::time_point steady_clock::now() BOOST_NOEXCEPT
{
static double nanosecs_per_tic = chrono_detail::get_nanosecs_per_tic();
boost::detail::win32::LARGE_INTEGER_ pcount;
if ( (nanosecs_per_tic <= 0.0L) ||
(!boost::detail::win32::QueryPerformanceCounter( &pcount )) )
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
return steady_clock::time_point();
}
return steady_clock::time_point(steady_clock::duration(
static_cast<steady_clock::rep>((nanosecs_per_tic) * pcount.QuadPart)));
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
steady_clock::time_point steady_clock::now( system::error_code & ec )
{
static double nanosecs_per_tic = chrono_detail::get_nanosecs_per_tic();
boost::detail::win32::LARGE_INTEGER_ pcount;
if ( (nanosecs_per_tic <= 0.0L)
|| (!boost::detail::win32::QueryPerformanceCounter( &pcount )) )
{
boost::detail::win32::DWORD_ cause =
((nanosecs_per_tic <= 0.0L)
? ERROR_NOT_SUPPORTED
: boost::detail::win32::GetLastError());
if (BOOST_CHRONO_IS_THROWS(ec)) {
boost::throw_exception(
system::system_error(
cause,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::steady_clock" ));
}
else
{
ec.assign( cause, BOOST_CHRONO_SYSTEM_CATEGORY );
return steady_clock::time_point(duration(0));
}
}
if (!BOOST_CHRONO_IS_THROWS(ec))
{
ec.clear();
}
return time_point(duration(
static_cast<steady_clock::rep>(nanosecs_per_tic * pcount.QuadPart)));
}
#endif
BOOST_CHRONO_INLINE
system_clock::time_point system_clock::now() BOOST_NOEXCEPT
{
boost::detail::win32::FILETIME_ ft;
#if defined(UNDER_CE)
// Windows CE does not define GetSystemTimeAsFileTime so we do it in two steps.
boost::detail::win32::SYSTEMTIME_ st;
boost::detail::win32::GetSystemTime( &st );
boost::detail::win32::SystemTimeToFileTime( &st, &ft );
#else
boost::detail::win32::GetSystemTimeAsFileTime( &ft ); // never fails
#endif
return system_clock::time_point(system_clock::duration(
(static_cast<__int64>( ft.dwHighDateTime ) << 32) | ft.dwLowDateTime));
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
BOOST_CHRONO_INLINE
system_clock::time_point system_clock::now( system::error_code & ec )
{
boost::detail::win32::FILETIME_ ft;
#if defined(UNDER_CE)
// Windows CE does not define GetSystemTimeAsFileTime so we do it in two steps.
boost::detail::win32::SYSTEMTIME_ st;
boost::detail::win32::GetSystemTime( &st );
boost::detail::win32::SystemTimeToFileTime( &st, &ft );
#else
boost::detail::win32::GetSystemTimeAsFileTime( &ft ); // never fails
#endif
if (!BOOST_CHRONO_IS_THROWS(ec))
{
ec.clear();
}
return time_point(duration(
(static_cast<__int64>( ft.dwHighDateTime ) << 32) | ft.dwLowDateTime));
}
#endif
BOOST_CHRONO_INLINE
std::time_t system_clock::to_time_t(const system_clock::time_point& t) BOOST_NOEXCEPT
{
__int64 temp = t.time_since_epoch().count();
# if (!defined( BOOST_MSVC )) || (BOOST_MSVC > 1300) // > VC++ 7.0
temp -= 116444736000000000LL; // delta from epoch in microseconds
# else
temp -= 116444736000000000;
# endif
temp /= 10000000;
return static_cast<std::time_t>( temp );
}
BOOST_CHRONO_INLINE
system_clock::time_point system_clock::from_time_t(std::time_t t) BOOST_NOEXCEPT
{
__int64 temp = t;
temp *= 10000000;
# if (!defined( BOOST_MSVC )) || (BOOST_MSVC > 1300) // > VC++ 7.0
temp += 116444736000000000LL;
# else
temp += 116444736000000000;
# endif
return time_point(duration(temp));
}
} // namespace chrono
} // namespace boost
#endif
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