// posix/chrono.cpp --------------------------------------------------------------//
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// Copyright Beman Dawes 2008
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// Copyright Vicente J. Botet Escriba 2009
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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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// POSIX //
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//----------------------------------------------------------------------------//
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#include <time.h> // for clock_gettime
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#include <boost/assert.hpp>
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#include <boost/predef/os.h>
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namespace boost
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{
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namespace chrono
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{
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system_clock::time_point system_clock::now() BOOST_NOEXCEPT
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{
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timespec ts;
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if ( ::clock_gettime( CLOCK_REALTIME, &ts ) )
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{
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BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
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}
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return time_point(duration(
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static_cast<system_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
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}
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#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
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system_clock::time_point system_clock::now(system::error_code & ec)
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{
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timespec ts;
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if ( ::clock_gettime( CLOCK_REALTIME, &ts ) )
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{
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if (::boost::chrono::is_throws(ec))
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{
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boost::throw_exception(
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system::system_error(
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errno,
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::boost::system::system_category(),
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"chrono::system_clock" ));
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}
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else
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{
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ec.assign( errno, ::boost::system::system_category() );
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return time_point();
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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<system_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
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}
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#endif
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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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return static_cast<std::time_t>( t.time_since_epoch().count() / 1000000000 );
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}
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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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return time_point(duration(static_cast<system_clock::rep>(t) * 1000000000));
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}
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#ifdef BOOST_CHRONO_HAS_CLOCK_STEADY
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steady_clock::time_point steady_clock::now() BOOST_NOEXCEPT
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{
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timespec ts;
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#if BOOST_OS_CYGWIN
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// lack of thread safety in high resolution timer initialization
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// can lead to a timespec of zero without an error; was reported
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// to the cygwin mailing list and can be removed once fixed
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do
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{
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#endif
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if ( ::clock_gettime( CLOCK_MONOTONIC, &ts ) )
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{
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BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
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}
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#if BOOST_OS_CYGWIN
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} while (ts.tv_sec == 0 && ts.tv_nsec == 0);
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#endif
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return time_point(duration(
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static_cast<steady_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
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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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timespec ts;
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#if BOOST_OS_CYGWIN
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// lack of thread safety in high resolution timer initialization
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// can lead to a timespec of zero without an error; was reported
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// to the cygwin mailing list and can be removed once fixed
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do
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{
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#endif
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if ( ::clock_gettime( CLOCK_MONOTONIC, &ts ) )
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{
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if (::boost::chrono::is_throws(ec))
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{
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boost::throw_exception(
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system::system_error(
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errno,
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::boost::system::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( errno, ::boost::system::system_category() );
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return time_point();
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}
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}
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#if BOOST_OS_CYGWIN
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} while (ts.tv_sec == 0 && ts.tv_nsec == 0);
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#endif
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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>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
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}
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#endif
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#endif
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} // namespace chrono
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} // namespace boost
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