89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
// boost thread_clock.cpp -----------------------------------------------------------//
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// Copyright Beman Dawes 1994, 2006, 2008
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// Copyright Vicente J. Botet Escriba 2009-2011
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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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// See http://www.boost.org/libs/chrono for documentation.
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//--------------------------------------------------------------------------------------//
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#include <boost/chrono/config.hpp>
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#include <boost/chrono/thread_clock.hpp>
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#include <cassert>
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# include <sys/times.h>
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# include <unistd.h>
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namespace boost { namespace chrono {
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thread_clock::time_point thread_clock::now( ) BOOST_CHRONO_NOEXCEPT
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{
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struct timespec ts;
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#if defined CLOCK_THREAD_CPUTIME_ID
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// get the timespec associated to the thread clock
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if ( ::clock_gettime( CLOCK_THREAD_CPUTIME_ID, &ts ) )
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#else
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// get the current thread
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pthread_t pth=pthread_self();
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// get the clock_id associated to the current thread
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clockid_t clock_id;
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pthread_getcpuclockid(pth, &clock_id);
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// get the timespec associated to the thread clock
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if ( ::clock_gettime( clock_id, &ts ) )
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#endif
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{
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BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
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}
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// transform to nanoseconds
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return time_point(duration(
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static_cast<thread_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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thread_clock::time_point thread_clock::now( system::error_code & ec )
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{
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struct timespec ts;
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#if defined CLOCK_THREAD_CPUTIME_ID
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// get the timespec associated to the thread clock
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if ( ::clock_gettime( CLOCK_THREAD_CPUTIME_ID, &ts ) )
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#else
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// get the current thread
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pthread_t pth=pthread_self();
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// get the clock_id associated to the current thread
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clockid_t clock_id;
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pthread_getcpuclockid(pth, &clock_id);
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// get the timespec associated to the thread clock
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if ( ::clock_gettime( clock_id, &ts ) )
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#endif
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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_CHRONO_SYSTEM_CATEGORY,
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"chrono::thread_clock" ));
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}
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else
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{
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ec.assign( errno, BOOST_CHRONO_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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// transform to nanoseconds
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return time_point(duration(
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static_cast<thread_clock::rep>( ts.tv_sec ) * 1000000000 + ts.tv_nsec));
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}
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#endif
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} }
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