Chris@16: //  posix/chrono.cpp  --------------------------------------------------------------//
Chris@16: 
Chris@16: //  Copyright Beman Dawes 2008
Chris@16: //  Copyright Vicente J. Botet Escriba 2009
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: //                                POSIX                                     //
Chris@16: //----------------------------------------------------------------------------//
Chris@16: 
Chris@16: #include <time.h>  // for clock_gettime
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: namespace chrono
Chris@16: {
Chris@16: 
Chris@16:   system_clock::time_point system_clock::now() BOOST_NOEXCEPT
Chris@16:   {
Chris@16:     timespec ts;
Chris@16:     if ( ::clock_gettime( CLOCK_REALTIME, &ts ) )
Chris@16:     {
Chris@16:       BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
Chris@16:     }
Chris@16: 
Chris@16:     return time_point(duration(
Chris@16:       static_cast<system_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
Chris@16:   }
Chris@16: 
Chris@16: #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
Chris@16:   system_clock::time_point system_clock::now(system::error_code & ec)
Chris@16:   {
Chris@16:     timespec ts;
Chris@16:     if ( ::clock_gettime( CLOCK_REALTIME, &ts ) )
Chris@16:     {
Chris@16:         if (BOOST_CHRONO_IS_THROWS(ec))
Chris@16:         {
Chris@16:             boost::throw_exception(
Chris@16:                     system::system_error( 
Chris@16:                             errno, 
Chris@16:                             BOOST_CHRONO_SYSTEM_CATEGORY, 
Chris@16:                             "chrono::system_clock" ));
Chris@16:         }
Chris@16:         else
Chris@16:         {
Chris@16:             ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
Chris@16:             return time_point();
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<system_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
Chris@16:   }
Chris@16: #endif
Chris@16: 
Chris@16:   std::time_t system_clock::to_time_t(const system_clock::time_point& t) BOOST_NOEXCEPT
Chris@16:   {
Chris@16:       return static_cast<std::time_t>( t.time_since_epoch().count() / 1000000000 );
Chris@16:   }
Chris@16: 
Chris@16:   system_clock::time_point system_clock::from_time_t(std::time_t t) BOOST_NOEXCEPT
Chris@16:   {
Chris@16:       return time_point(duration(static_cast<system_clock::rep>(t) * 1000000000));
Chris@16:   }
Chris@16: 
Chris@16: #ifdef BOOST_CHRONO_HAS_CLOCK_STEADY
Chris@16: 
Chris@16:   steady_clock::time_point steady_clock::now() BOOST_NOEXCEPT
Chris@16:   {
Chris@16:     timespec ts;
Chris@16:     if ( ::clock_gettime( CLOCK_MONOTONIC, &ts ) )
Chris@16:     {
Chris@16:       BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
Chris@16:     }
Chris@16: 
Chris@16:     return time_point(duration(
Chris@16:       static_cast<steady_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
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@16:     timespec ts;
Chris@16:     if ( ::clock_gettime( CLOCK_MONOTONIC, &ts ) )
Chris@16:     {
Chris@16:         if (BOOST_CHRONO_IS_THROWS(ec))
Chris@16:         {
Chris@16:             boost::throw_exception(
Chris@16:                     system::system_error( 
Chris@16:                             errno, 
Chris@16:                             BOOST_CHRONO_SYSTEM_CATEGORY, 
Chris@16:                             "chrono::steady_clock" ));
Chris@16:         }
Chris@16:         else
Chris@16:         {
Chris@16:             ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
Chris@16:             return time_point();
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>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
Chris@16:   }
Chris@16: #endif
Chris@16: #endif
Chris@16: 
Chris@16: }  // namespace chrono
Chris@16: }  // namespace boost
Chris@16: 
Chris@16: