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