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- // Copyright (c) 2005-2010 Hartmut Kaiser
- // Copyright (c) 2009 Edward Grace
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- #if !defined(HIGH_RESOLUTION_TIMER_MAR_24_2008_1222PM)
- #define HIGH_RESOLUTION_TIMER_MAR_24_2008_1222PM
- #include <boost/config.hpp>
- #include <boost/throw_exception.hpp>
- #if defined(BOOST_HAS_UNISTD_H)
- #include <unistd.h>
- #endif
- #include <time.h>
- #include <stdexcept>
- #include <limits>
- #if defined(BOOST_WINDOWS)
- #include <windows.h>
- namespace boost {
- namespace archive {
- namespace xml {
- ///////////////////////////////////////////////////////////////////////////////
- //
- // high_resolution_timer
- // A timer object measures elapsed time.
- // CAUTION: Windows only!
- //
- ///////////////////////////////////////////////////////////////////////////////
- class high_resolution_timer
- {
- public:
- high_resolution_timer()
- {
- restart();
- }
- high_resolution_timer(double t)
- {
- LARGE_INTEGER frequency;
- if (!QueryPerformanceFrequency(&frequency))
- boost::throw_exception(std::runtime_error("Couldn't acquire frequency"));
- start_time.QuadPart = (LONGLONG)(t * frequency.QuadPart);
- }
- high_resolution_timer(high_resolution_timer const& rhs)
- : start_time(rhs.start_time)
- {
- }
- static double now()
- {
- SYSTEMTIME st;
- GetSystemTime(&st);
- FILETIME ft;
- SystemTimeToFileTime(&st, &ft);
- LARGE_INTEGER now;
- now.LowPart = ft.dwLowDateTime;
- now.HighPart = ft.dwHighDateTime;
- // FileTime is in 100ns increments, result needs to be in [s]
- return now.QuadPart * 1e-7;
- }
- void restart()
- {
- if (!QueryPerformanceCounter(&start_time))
- boost::throw_exception(std::runtime_error("Couldn't initialize start_time"));
- }
- double elapsed() const // return elapsed time in seconds
- {
- LARGE_INTEGER now;
- if (!QueryPerformanceCounter(&now))
- boost::throw_exception(std::runtime_error("Couldn't get current time"));
- LARGE_INTEGER frequency;
- if (!QueryPerformanceFrequency(&frequency))
- boost::throw_exception(std::runtime_error("Couldn't acquire frequency"));
- return double(now.QuadPart - start_time.QuadPart) / frequency.QuadPart;
- }
- double elapsed_max() const // return estimated maximum value for elapsed()
- {
- LARGE_INTEGER frequency;
- if (!QueryPerformanceFrequency(&frequency))
- boost::throw_exception(std::runtime_error("Couldn't acquire frequency"));
- return double((std::numeric_limits<LONGLONG>::max)() - start_time.QuadPart) /
- double(frequency.QuadPart);
- }
- double elapsed_min() const // return minimum value for elapsed()
- {
- LARGE_INTEGER frequency;
- if (!QueryPerformanceFrequency(&frequency))
- boost::throw_exception(std::runtime_error("Couldn't acquire frequency"));
- return 1.0 / frequency.QuadPart;
- }
- private:
- LARGE_INTEGER start_time;
- };
- } // xml
- } // archive
- } // boost
- #elif defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0 && defined(_POSIX_THREAD_CPUTIME)
- #if _POSIX_THREAD_CPUTIME > 0 // timer always supported
- namespace boost {
- namespace archive {
- namespace xml {
- ///////////////////////////////////////////////////////////////////////////////
- //
- // high_resolution_timer
- // A timer object measures elapsed time.
- //
- ///////////////////////////////////////////////////////////////////////////////
- class high_resolution_timer
- {
- public:
- high_resolution_timer()
- {
- start_time.tv_sec = 0;
- start_time.tv_nsec = 0;
- restart();
- }
- high_resolution_timer(double t)
- {
- start_time.tv_sec = time_t(t);
- start_time.tv_nsec = (t - start_time.tv_sec) * 1e9;
- }
- high_resolution_timer(high_resolution_timer const& rhs)
- : start_time(rhs.start_time)
- {
- }
- static double now()
- {
- timespec now;
- if (-1 == clock_gettime(CLOCK_REALTIME, &now))
- boost::throw_exception(std::runtime_error("Couldn't get current time"));
- return double(now.tv_sec) + double(now.tv_nsec) * 1e-9;
- }
- void restart()
- {
- if (-1 == clock_gettime(CLOCK_REALTIME, &start_time))
- boost::throw_exception(std::runtime_error("Couldn't initialize start_time"));
- }
- double elapsed() const // return elapsed time in seconds
- {
- timespec now;
- if (-1 == clock_gettime(CLOCK_REALTIME, &now))
- boost::throw_exception(std::runtime_error("Couldn't get current time"));
- if (now.tv_sec == start_time.tv_sec)
- return double(now.tv_nsec - start_time.tv_nsec) * 1e-9;
- return double(now.tv_sec - start_time.tv_sec) +
- (double(now.tv_nsec - start_time.tv_nsec) * 1e-9);
- }
- double elapsed_max() const // return estimated maximum value for elapsed()
- {
- return double((std::numeric_limits<time_t>::max)() - start_time.tv_sec);
- }
- double elapsed_min() const // return minimum value for elapsed()
- {
- timespec resolution;
- if (-1 == clock_getres(CLOCK_REALTIME, &resolution))
- boost::throw_exception(std::runtime_error("Couldn't get resolution"));
- return double(resolution.tv_sec + resolution.tv_nsec * 1e-9);
- }
- private:
- timespec start_time;
- };
- } // xml
- } // archive
- } // boost
- #else // _POSIX_THREAD_CPUTIME > 0
- #include <boost/timer.hpp>
- // availability of high performance timers must be checked at runtime
- namespace boost {
- namespace archive {
- namespace xml {
- ///////////////////////////////////////////////////////////////////////////////
- //
- // high_resolution_timer
- // A timer object measures elapsed time.
- //
- ///////////////////////////////////////////////////////////////////////////////
- class high_resolution_timer
- {
- public:
- high_resolution_timer()
- : use_backup(sysconf(_SC_THREAD_CPUTIME) <= 0)
- {
- if (!use_backup) {
- start_time.tv_sec = 0;
- start_time.tv_nsec = 0;
- }
- restart();
- }
- high_resolution_timer(double t)
- : use_backup(sysconf(_SC_THREAD_CPUTIME) <= 0)
- {
- if (!use_backup) {
- start_time.tv_sec = time_t(t);
- start_time.tv_nsec = (t - start_time.tv_sec) * 1e9;
- }
- }
-
- high_resolution_timer(high_resolution_timer const& rhs)
- : use_backup(sysconf(_SC_THREAD_CPUTIME) <= 0),
- start_time(rhs.start_time)
- {
- }
- static double now()
- {
- if (sysconf(_SC_THREAD_CPUTIME) <= 0)
- return double(std::clock());
- timespec now;
- if (-1 == clock_gettime(CLOCK_REALTIME, &now))
- boost::throw_exception(std::runtime_error("Couldn't get current time"));
- return double(now.tv_sec) + double(now.tv_nsec) * 1e-9;
- }
- void restart()
- {
- if (use_backup)
- start_time_backup.restart();
- else if (-1 == clock_gettime(CLOCK_REALTIME, &start_time))
- boost::throw_exception(std::runtime_error("Couldn't initialize start_time"));
- }
- double elapsed() const // return elapsed time in seconds
- {
- if (use_backup)
- return start_time_backup.elapsed();
- timespec now;
- if (-1 == clock_gettime(CLOCK_REALTIME, &now))
- boost::throw_exception(std::runtime_error("Couldn't get current time"));
- if (now.tv_sec == start_time.tv_sec)
- return double(now.tv_nsec - start_time.tv_nsec) * 1e-9;
-
- return double(now.tv_sec - start_time.tv_sec) +
- (double(now.tv_nsec - start_time.tv_nsec) * 1e-9);
- }
- double elapsed_max() const // return estimated maximum value for elapsed()
- {
- if (use_backup)
- start_time_backup.elapsed_max();
- return double((std::numeric_limits<time_t>::max)() - start_time.tv_sec);
- }
- double elapsed_min() const // return minimum value for elapsed()
- {
- if (use_backup)
- start_time_backup.elapsed_min();
- timespec resolution;
- if (-1 == clock_getres(CLOCK_REALTIME, &resolution))
- boost::throw_exception(std::runtime_error("Couldn't get resolution"));
- return double(resolution.tv_sec + resolution.tv_nsec * 1e-9);
- }
- private:
- bool use_backup;
- timespec start_time;
- boost::timer start_time_backup;
- };
- } // xml
- } // archive
- } // boost
- #endif // _POSIX_THREAD_CPUTIME > 0
- #else // !defined(BOOST_WINDOWS) && (!defined(_POSIX_TIMERS)
- // || _POSIX_TIMERS <= 0
- // || !defined(_POSIX_THREAD_CPUTIME)
- // || _POSIX_THREAD_CPUTIME <= 0)
- #if defined(BOOST_HAS_GETTIMEOFDAY)
- // For platforms that do not support _POSIX_TIMERS but do have
- // GETTIMEOFDAY, which is still preferable to std::clock()
- #include <sys/time.h>
- namespace boost {
- namespace archive {
- namespace xml {
- ///////////////////////////////////////////////////////////////////////////
- //
- // high_resolution_timer
- // A timer object measures elapsed time.
- //
- // Implemented with gettimeofday() for platforms that support it,
- // such as Darwin (OS X) but do not support the previous options.
- //
- // Copyright (c) 2009 Edward Grace
- //
- ///////////////////////////////////////////////////////////////////////////
- class high_resolution_timer
- {
- private:
- template <typename U>
- static inline double unsigned_diff(const U &a, const U &b)
- {
- if (a > b)
- return static_cast<double>(a-b);
- return -static_cast<double>(b-a);
- }
- // @brief Return the difference between two timeval types.
- //
- // @param t1 The most recent timeval.
- // @param t0 The historical timeval.
- //
- // @return The difference between the two in seconds.
- double elapsed(const timeval &t1, const timeval &t0) const
- {
- if (t1.tv_sec == t0.tv_sec)
- return unsigned_diff(t1.tv_usec,t0.tv_usec) * 1e-6;
- // We do it this way as the result of the difference of the
- // microseconds can be negative if the clock is implemented so
- // that the seconds timer increases in large steps.
- //
- // Naive subtraction of the unsigned types and conversion to
- // double can wreak havoc!
- return unsigned_diff(t1.tv_sec,t0.tv_sec) +
- unsigned_diff(t1.tv_usec,t0.tv_usec) * 1e-6;
- }
- public:
- high_resolution_timer()
- {
- start_time.tv_sec = 0;
- start_time.tv_usec = 0;
- restart();
- }
- high_resolution_timer(double t)
- {
- start_time.tv_sec = time_t(t);
- start_time.tv_usec = (t - start_time.tv_sec) * 1e6;
- }
- high_resolution_timer(high_resolution_timer const& rhs)
- : start_time(rhs.start_time)
- {
- }
- static double now()
- {
- // Under some implementations gettimeofday() will always
- // return zero. If it returns anything else however then
- // we accept this as evidence of an error. Note we are
- // not assuming that -1 explicitly indicates the error
- // condition, just that non zero is indicative of the
- // error.
- timeval now;
- if (gettimeofday(&now, NULL))
- boost::throw_exception(std::runtime_error("Couldn't get current time"));
- return double(now.tv_sec) + double(now.tv_usec) * 1e-6;
- }
- void restart()
- {
- if (gettimeofday(&start_time, NULL))
- boost::throw_exception(std::runtime_error("Couldn't initialize start_time"));
- }
- double elapsed() const // return elapsed time in seconds
- {
- timeval now;
- if (gettimeofday(&now, NULL))
- boost::throw_exception(std::runtime_error("Couldn't get current time"));
- return elapsed(now,start_time);
- }
- double elapsed_max() const // return estimated maximum value for elapsed()
- {
- return double((std::numeric_limits<time_t>::max)() - start_time.tv_sec);
- }
- double elapsed_min() const // return minimum value for elapsed()
- {
- // On systems without an explicit clock_getres or similar
- // we can only estimate an upper bound on the resolution
- // by repeatedly calling the gettimeofday function. This
- // is often likely to be indicative of the true
- // resolution.
- timeval t0, t1;
- double delta(0);
- if (gettimeofday(&t0, NULL))
- boost::throw_exception(std::runtime_error("Couldn't get resolution."));
- // Spin around in a tight loop until we observe a change
- // in the reported timer value.
- do {
- if (gettimeofday(&t1, NULL))
- boost::throw_exception(std::runtime_error("Couldn't get resolution."));
- delta = elapsed(t1, t0);
- } while (delta <= 0.0);
- return delta;
- }
- private:
- timeval start_time;
- };
- } // xml
- } // archive
- } // boost
- #else // BOOST_HAS_GETTIMEOFDAY
- // For platforms other than Windows or Linux, or not implementing gettimeofday
- // simply fall back to boost::timer
- #include <boost/timer.hpp>
- namespace boost {
- namespace archive {
- namespace xml {
- struct high_resolution_timer
- : boost::timer
- {
- static double now()
- {
- return double(std::clock());
- }
- };
- } // xml
- } // archive
- } // boost
-
- #endif
- #endif
- #endif // HIGH_RESOLUTION_TIMER_AUG_14_2009_0425PM
- //
- // $Log: high_resolution_timer.hpp,v $
- // Revision 1.4 2009/08/14 15:28:10 graceej
- // * It is entirely possible for the updating clock to increment the
- // * seconds and *decrement* the microseconds field. Consequently
- // * when subtracting these unsigned microseconds fields a wrap-around
- // * error can occur. For this reason elapsed(t1, t0) is used in a
- // * similar maner to cycle.h this preserves the sign of the
- // * difference.
- //
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