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