inlined/win/thread_clock.hpp

0001 //  boost thread_clock.cpp  -----------------------------------------------------------//
0002
0003 //  Copyright 2010 Vicente J. Botet Escriba
0004
0005 //  Distributed under the Boost Software License, Version 1.0.
0006 //  See http://www.boost.org/LICENSE_1_0.txt
0007
0008 //  See http://www.boost.org/libs/chrono for documentation.
0009
0010 //--------------------------------------------------------------------------------------//
0011 #ifndef BOOST_CHRONO_DETAIL_INLINED_WIN_THREAD_CLOCK_HPP
0012 #define BOOST_CHRONO_DETAIL_INLINED_WIN_THREAD_CLOCK_HPP
0013
0014 #include <boost/chrono/config.hpp>
0015 #include <boost/chrono/thread_clock.hpp>
0016 #include <cassert>
0017 #include <boost/assert.hpp>
0018
0019 #include <boost/winapi/get_last_error.hpp>
0020 #include <boost/winapi/get_current_thread.hpp>
0021 #include <boost/winapi/get_thread_times.hpp>
0022
0023 namespace boost
0024 {
0025 namespace chrono
0026 {
0027
0028 #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
0029 thread_clock::time_point thread_clock::now( system::error_code & ec )
0030 {
0031     //  note that Windows uses 100 nanosecond ticks for FILETIME
0032     boost::winapi::FILETIME_ creation, exit, user_time, system_time;
0033
0034     if ( boost::winapi::GetThreadTimes(
0035             boost::winapi::GetCurrentThread (), &creation, &exit,
0036             &system_time, &user_time ) )
0037     {
0038         duration user = duration(
0039                 ((static_cast<duration::rep>(user_time.dwHighDateTime) << 32)
0040                         | user_time.dwLowDateTime) * 100 );
0041
0042         duration system = duration(
0043                 ((static_cast<duration::rep>(system_time.dwHighDateTime) << 32)
0044                         | system_time.dwLowDateTime) * 100 );
0045
0046         if (!::boost::chrono::is_throws(ec))
0047         {
0048             ec.clear();
0049         }
0050         return time_point(system+user);
0051
0052     }
0053     else
0054     {
0055         if (::boost::chrono::is_throws(ec))
0056         {
0057             boost::throw_exception(
0058                     system::system_error(
0059                             boost::winapi::GetLastError(),
0060                             ::boost::system::system_category(),
0061                             "chrono::thread_clock" ));
0062         }
0063         else
0064         {
0065             ec.assign( boost::winapi::GetLastError(), ::boost::system::system_category() );
0066             return thread_clock::time_point(duration(0));
0067         }
0068     }
0069 }
0070 #endif
0071
0072 thread_clock::time_point thread_clock::now() BOOST_NOEXCEPT
0073 {
0074
0075     //  note that Windows uses 100 nanosecond ticks for FILETIME
0076     boost::winapi::FILETIME_ creation, exit, user_time, system_time;
0077
0078     if ( boost::winapi::GetThreadTimes(
0079             boost::winapi::GetCurrentThread (), &creation, &exit,
0080             &system_time, &user_time ) )
0081     {
0082         duration user   = duration(
0083                 ((static_cast<duration::rep>(user_time.dwHighDateTime) << 32)
0084                         | user_time.dwLowDateTime) * 100 );
0085
0086         duration system = duration(
0087                 ((static_cast<duration::rep>(system_time.dwHighDateTime) << 32)
0088                         | system_time.dwLowDateTime) * 100 );
0089
0090         return time_point(system+user);
0091     }
0092     else
0093     {
0094       BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
0095       return time_point();
0096     }
0097
0098 }
0099
0100 } // namespace chrono
0101 } // namespace boost
0102
0103 #endif