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- // boost process_cpu_clocks.cpp -----------------------------------------------------------//
- // Copyright Beman Dawes 1994, 2006, 2008
- // Copyright Vicente J. Botet Escriba 2009
- // 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/process_cpu_clocks.hpp>
- #include <boost/assert.hpp>
- #include <sys/times.h>
- #include <unistd.h>
- #include <time.h> // for clock_gettime
- namespace boost { namespace chrono {
- namespace chrono_detail
- {
- inline nanoseconds::rep tick_factor() // multiplier to convert ticks
- // to nanoseconds; -1 if unknown
- {
- long factor = 0;
- if ( !factor )
- {
- if ( (factor = ::sysconf( _SC_CLK_TCK )) <= 0 )
- factor = -1;
- else
- {
- BOOST_ASSERT( factor <= 1000000000l ); // doesn't handle large ticks
- factor = 1000000000l / factor; // compute factor
- if ( !factor ) factor = -1;
- }
- }
- return factor;
- }
- }
- process_real_cpu_clock::time_point process_real_cpu_clock::now() BOOST_NOEXCEPT
- {
- tms tm;
- clock_t c = ::times( &tm );
- if ( c == clock_t(-1) ) // error
- {
- BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
- }
- else
- {
- if ( chrono_detail::tick_factor() != -1 )
- {
- return time_point(
- nanoseconds(c*chrono_detail::tick_factor()));
- }
- else
- {
- BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
- }
- }
- return time_point();
- }
- #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
- process_real_cpu_clock::time_point process_real_cpu_clock::now(
- system::error_code & ec)
- {
- tms tm;
- clock_t c = ::times( &tm );
- if ( c == clock_t(-1) ) // error
- {
- if (::boost::chrono::is_throws(ec))
- {
- boost::throw_exception(
- system::system_error(
- errno,
- ::boost::system::system_category(),
- "chrono::process_real_cpu_clock" ));
- }
- else
- {
- ec.assign( errno, ::boost::system::system_category() );
- return time_point();
- }
- }
- else
- {
- if ( chrono_detail::tick_factor() != -1 )
- {
- if (!::boost::chrono::is_throws(ec))
- {
- ec.clear();
- }
- return time_point(
- nanoseconds(c*chrono_detail::tick_factor()));
- }
- else
- {
- if (::boost::chrono::is_throws(ec))
- {
- boost::throw_exception(
- system::system_error(
- errno,
- ::boost::system::system_category(),
- "chrono::process_real_cpu_clock" ));
- }
- else
- {
- ec.assign( errno, ::boost::system::system_category() );
- return time_point();
- }
- }
- }
- }
- #endif
- process_user_cpu_clock::time_point process_user_cpu_clock::now() BOOST_NOEXCEPT
- {
- tms tm;
- clock_t c = ::times( &tm );
- if ( c == clock_t(-1) ) // error
- {
- BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
- }
- else
- {
- if ( chrono_detail::tick_factor() != -1 )
- {
- return time_point(
- nanoseconds((tm.tms_utime + tm.tms_cutime)*chrono_detail::tick_factor()));
- }
- else
- {
- BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
- }
- }
- return time_point();
- }
- #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
- process_user_cpu_clock::time_point process_user_cpu_clock::now(
- system::error_code & ec)
- {
- tms tm;
- clock_t c = ::times( &tm );
- if ( c == clock_t(-1) ) // error
- {
- if (::boost::chrono::is_throws(ec))
- {
- boost::throw_exception(
- system::system_error(
- errno,
- ::boost::system::system_category(),
- "chrono::process_user_cpu_clock" ));
- }
- else
- {
- ec.assign( errno, ::boost::system::system_category() );
- return time_point();
- }
- }
- else
- {
- if ( chrono_detail::tick_factor() != -1 )
- {
- if (!::boost::chrono::is_throws(ec))
- {
- ec.clear();
- }
- return time_point(
- nanoseconds((tm.tms_utime + tm.tms_cutime)*chrono_detail::tick_factor()));
- }
- else
- {
- if (::boost::chrono::is_throws(ec))
- {
- boost::throw_exception(
- system::system_error(
- errno,
- ::boost::system::system_category(),
- "chrono::process_user_cpu_clock" ));
- }
- else
- {
- ec.assign( errno, ::boost::system::system_category() );
- return time_point();
- }
- }
- }
- }
- #endif
- process_system_cpu_clock::time_point process_system_cpu_clock::now() BOOST_NOEXCEPT
- {
- tms tm;
- clock_t c = ::times( &tm );
- if ( c == clock_t(-1) ) // error
- {
- BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
- return time_point();
- }
- else
- {
- if ( chrono_detail::tick_factor() != -1 )
- {
- return time_point(
- nanoseconds((tm.tms_stime + tm.tms_cstime)*chrono_detail::tick_factor()));
- }
- else
- {
- BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
- return time_point();
- }
- }
- }
- #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
- process_system_cpu_clock::time_point process_system_cpu_clock::now(
- system::error_code & ec)
- {
- tms tm;
- clock_t c = ::times( &tm );
- if ( c == clock_t(-1) ) // error
- {
- if (::boost::chrono::is_throws(ec))
- {
- boost::throw_exception(
- system::system_error(
- errno,
- ::boost::system::system_category(),
- "chrono::process_system_cpu_clock" ));
- }
- else
- {
- ec.assign( errno, ::boost::system::system_category() );
- return time_point();
- }
- }
- else
- {
- if ( chrono_detail::tick_factor() != -1 )
- {
- if (!::boost::chrono::is_throws(ec))
- {
- ec.clear();
- }
- return time_point(
- nanoseconds((tm.tms_stime + tm.tms_cstime)*chrono_detail::tick_factor()));
- }
- else
- {
- if (::boost::chrono::is_throws(ec))
- {
- boost::throw_exception(
- system::system_error(
- errno,
- ::boost::system::system_category(),
- "chrono::process_system_cpu_clock" ));
- }
- else
- {
- ec.assign( errno, ::boost::system::system_category() );
- return time_point();
- }
- }
- }
- }
- #endif
- process_cpu_clock::time_point process_cpu_clock::now() BOOST_NOEXCEPT
- {
- tms tm;
- clock_t c = ::times( &tm );
- if ( c == clock_t(-1) ) // error
- {
- BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
- }
- else
- {
- nanoseconds::rep factor = chrono_detail::tick_factor();
- if ( factor != -1 )
- {
- time_point::rep r(
- c*factor,
- (tm.tms_utime + tm.tms_cutime)*factor,
- (tm.tms_stime + tm.tms_cstime)*factor);
- return time_point(duration(r));
- }
- else
- {
- BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
- }
- }
- return time_point();
- }
- #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
- process_cpu_clock::time_point process_cpu_clock::now(
- system::error_code & ec )
- {
- tms tm;
- clock_t c = ::times( &tm );
- if ( c == clock_t(-1) ) // error
- {
- if (::boost::chrono::is_throws(ec))
- {
- boost::throw_exception(
- system::system_error(
- errno,
- ::boost::system::system_category(),
- "chrono::process_clock" ));
- }
- else
- {
- ec.assign( errno, ::boost::system::system_category() );
- return time_point();
- }
- }
- else
- {
- if ( chrono_detail::tick_factor() != -1 )
- {
- time_point::rep r(
- c*chrono_detail::tick_factor(),
- (tm.tms_utime + tm.tms_cutime)*chrono_detail::tick_factor(),
- (tm.tms_stime + tm.tms_cstime)*chrono_detail::tick_factor());
- return time_point(duration(r));
- }
- else
- {
- if (::boost::chrono::is_throws(ec))
- {
- boost::throw_exception(
- system::system_error(
- errno,
- ::boost::system::system_category(),
- "chrono::process_clock" ));
- }
- else
- {
- ec.assign( errno, ::boost::system::system_category() );
- return time_point();
- }
- }
- }
- }
- #endif
- } }
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