357 lines
10 KiB
Plaintext
357 lines
10 KiB
Plaintext
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// 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/time.h> //for gettimeofday and timeval
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#include <sys/times.h> //for times
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# include <unistd.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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namespace chrono_detail
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{
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inline long 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)
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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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#if 1
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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (factor != -1)
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{
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return time_point(nanoseconds(c * factor));
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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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#else
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clock_t c = ::clock();
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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (factor != -1)
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{
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return time_point(nanoseconds(c * factor));
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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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#endif
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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(system::error_code & ec)
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{
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#if 1
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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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_real_cpu_clock"));
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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (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(nanoseconds(c * factor));
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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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_real_cpu_clock"));
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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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#else
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clock_t c = ::clock();
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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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_real_cpu_clock"));
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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (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(nanoseconds(c * factor));
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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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_real_cpu_clock"));
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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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#endif
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}
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#endif
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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(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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_user_cpu_clock"));
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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (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(nanoseconds((tm.tms_utime + tm.tms_cutime) * factor));
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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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_user_cpu_clock"));
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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (factor != -1)
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{
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return time_point(nanoseconds((tm.tms_utime + tm.tms_cutime)
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* factor));
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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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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (factor != -1)
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{
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return time_point(nanoseconds((tm.tms_stime + tm.tms_cstime)
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* factor));
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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_system_cpu_clock::time_point process_system_cpu_clock::now(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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_system_cpu_clock"));
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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (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(nanoseconds((tm.tms_stime + tm.tms_cstime) * factor));
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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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_system_cpu_clock"));
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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (factor != -1)
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{
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time_point::rep
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r(c * factor, (tm.tms_utime + tm.tms_cutime) * factor, (tm.tms_stime
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+ tm.tms_cstime) * factor);
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return time_point(duration(r));
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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(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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_clock"));
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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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} else
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{
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long factor = chrono_detail::tick_factor();
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if (factor != -1)
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{
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time_point::rep
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r(c * factor, (tm.tms_utime + tm.tms_cutime) * factor, (tm.tms_stime
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+ tm.tms_cstime) * factor);
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return time_point(duration(r));
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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(system::system_error(errno, BOOST_CHRONO_SYSTEM_CATEGORY, "chrono::process_clock"));
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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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}
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