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// boost thread_clock.cpp -----------------------------------------------------------//
// Copyright Beman Dawes 1994, 2006, 2008
// Copyright Vicente J. Botet Escriba 2009-2011
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
// See http://www.boost.org/libs/chrono for documentation.
//--------------------------------------------------------------------------------------//
#include <boost/chrono/config.hpp>
#include <boost/chrono/thread_clock.hpp>
#include <cassert>
# include <sys/times.h>
# include <unistd.h>
namespace boost { namespace chrono {
thread_clock::time_point thread_clock::now( ) BOOST_NOEXCEPT
{
struct timespec ts;
#if defined CLOCK_THREAD_CPUTIME_ID
// get the timespec associated to the thread clock
if ( ::clock_gettime( CLOCK_THREAD_CPUTIME_ID, &ts ) )
#else
// get the current thread
pthread_t pth=pthread_self();
// get the clock_id associated to the current thread
clockid_t clock_id;
pthread_getcpuclockid(pth, &clock_id);
// get the timespec associated to the thread clock
if ( ::clock_gettime( clock_id, &ts ) )
#endif
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
// transform to nanoseconds
return time_point(duration(
static_cast<thread_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
thread_clock::time_point thread_clock::now( system::error_code & ec )
{
struct timespec ts;
#if defined CLOCK_THREAD_CPUTIME_ID
// get the timespec associated to the thread clock
if ( ::clock_gettime( CLOCK_THREAD_CPUTIME_ID, &ts ) )
#else
// get the current thread
pthread_t pth=pthread_self();
// get the clock_id associated to the current thread
clockid_t clock_id;
pthread_getcpuclockid(pth, &clock_id);
// get the timespec associated to the thread clock
if ( ::clock_gettime( clock_id, &ts ) )
#endif
{
if (BOOST_CHRONO_IS_THROWS(ec))
{
boost::throw_exception(
system::system_error(
errno,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::thread_clock" ));
}
else
{
ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
return time_point();
}
}
if (!BOOST_CHRONO_IS_THROWS(ec))
{
ec.clear();
}
// transform to nanoseconds
return time_point(duration(
static_cast<thread_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
}
#endif
} }
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