performance_counter.hpp

新版本TR1的stl

         _MSC_VER >= 1200)
static stlsoft_ns_qual(class_constructor)<performance_counter>  s_performance_counter_class_constructor(&performance_counter::class_init, NULL);
# endif /* compiler */
#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

/* /////////////////////////////////////////////////////////////////////////
 * Unit-testing
 */

#ifdef STLSOFT_UNITTEST
# include "./unittest/performance_counter_unittest_.h"
#endif /* STLSOFT_UNITTEST */

/* /////////////////////////////////////////////////////////////////////////
 * Implementation
 */

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION

inline /* static */ performance_counter::interval_type performance_counter::query_frequency_()
{
    interval_type   frequency;

    // If no high-performance counter is available ...
    if( !::QueryPerformanceFrequency(reinterpret_cast<LARGE_INTEGER*>(&frequency)) ||
        frequency == 0)
    {
        // ... then set the divisor to be the frequency for GetTickCount(), which is
        // 1000 since it returns intervals in milliseconds.
        frequency = 1000;
    }

    return frequency;
}

inline /* static */ performance_counter::interval_type performance_counter::frequency_()
{
#if defined(STLSOFT_COMPILER_IS_MSVC) && \
    _MSC_VER >= 1310
  // Safe to suppress these warnings, because race-conditions are benign here
# pragma warning(push)
# pragma warning(disable : 4640)
#endif /* compiler */

#if defined(STLSOFT_COMPILER_IS_BORLAND)
    interval_type           s_frequency = query_frequency_();
#else /* ? compiler */
    static interval_type    s_frequency = query_frequency_();
#endif /* compiler */

    WINSTL_ASSERT(0 != s_frequency);

#if defined(STLSOFT_COMPILER_IS_MSVC) && \
    _MSC_VER >= 1310
# pragma warning(pop)
#endif /* compiler */

    return s_frequency;
}

inline /* static */ void performance_counter::qpc_(epoch_type &epoch)
{
    static_cast<void>(::QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER*>(&epoch)));
}

inline /* static */ void performance_counter::gtc_(epoch_type &epoch)
{
    epoch = static_cast<ws_sint32_t>(::GetTickCount());
}

inline /* static */ performance_counter::measure_fn_type performance_counter::get_measure_fn_()
{
    measure_fn_type fn;
    epoch_type      frequency;

    if(QueryPerformanceFrequency(reinterpret_cast<LARGE_INTEGER*>(&frequency)))
    {
        fn = qpc_;
    }
    else
    {
        fn = gtc_;
    }

    return fn;
}

inline /* static */ void performance_counter::measure_(epoch_type &epoch)
{
#if defined(STLSOFT_COMPILER_IS_MSVC) && \
    _MSC_VER >= 1310
  // Safe to suppress these warnings, because race-conditions are benign here
# pragma warning(push)
# pragma warning(disable : 4640)
#endif /* compiler */

    static measure_fn_type  fn  =   get_measure_fn_();

#if defined(STLSOFT_COMPILER_IS_MSVC) && \
    _MSC_VER >= 1310
# pragma warning(pop)
#endif /* compiler */

    fn(epoch);
}

// Operations
inline void performance_counter::start()
{
    measure_(m_start);
}

inline void performance_counter::stop()
{
    measure_(m_end);
}

inline void performance_counter::restart()
{
    measure_(m_start);
    m_end = m_start;
}

// Attributes

inline /* static */ performance_counter::epoch_type performance_counter::get_epoch()
{
    epoch_type  epoch;

    measure_(epoch);

    return epoch;
}

inline /* static */ performance_counter::interval_type performance_counter::get_seconds(performance_counter::epoch_type start, performance_counter::epoch_type end)
{
    interval_type   period_count    =   static_cast<interval_type>(end - start);

    return period_count / frequency_();
}

inline /* static */ performance_counter::interval_type performance_counter::get_milliseconds(performance_counter::epoch_type start, performance_counter::epoch_type end)
{
    interval_type   result;
    interval_type   count   =   static_cast<interval_type>(end - start);

#ifdef STLSOFT_CF_64BIT_INT_SUPPORT
    if(count < STLSOFT_GEN_SINT64_SUFFIX(0x20C49BA5E353F7))
#else /* ? STLSOFT_CF_64BIT_INT_SUPPORT */
    if(count < interval_type(0x20C49B, 0xA5E353F7))
#endif /* !STLSOFT_CF_64BIT_INT_SUPPORT */
    {
        result = (count * interval_type(1000)) / frequency_();
    }
    else
    {
        result = (count / frequency_()) * interval_type(1000);
    }

    return result;
}

inline /* static */ performance_counter::interval_type performance_counter::get_microseconds(performance_counter::epoch_type start, performance_counter::epoch_type end)
{
    interval_type   result;
    interval_type   count   =   static_cast<interval_type>(end - start);

#ifdef STLSOFT_CF_64BIT_INT_SUPPORT
    if(count < STLSOFT_GEN_SINT64_SUFFIX(0x8637BD05AF6))
#else /* ? STLSOFT_CF_64BIT_INT_SUPPORT */
    if(count < interval_type(0x863, 0x7BD05AF6))
#endif /* !STLSOFT_CF_64BIT_INT_SUPPORT */
    {
        result = (count * interval_type(1000000)) / frequency_();
    }
    else
    {
        result = (count / frequency_()) * interval_type(1000000);
    }

    return result;
}

inline performance_counter::interval_type performance_counter::get_period_count() const
{
    return static_cast<interval_type>(m_end - m_start);
}

inline performance_counter::interval_type performance_counter::get_seconds() const
{
    return get_period_count() / frequency_();
}

inline performance_counter::interval_type performance_counter::get_milliseconds() const
{
    interval_type   result;
    interval_type   count   =   get_period_count();

#ifdef STLSOFT_CF_64BIT_INT_SUPPORT
    if(count < STLSOFT_GEN_SINT64_SUFFIX(0x20C49BA5E353F7))
#else /* ? STLSOFT_CF_64BIT_INT_SUPPORT */
    if(count < interval_type(0x20C49B, 0xA5E353F7))
#endif /* !STLSOFT_CF_64BIT_INT_SUPPORT */
    {
        result = (count * interval_type(1000)) / frequency_();
    }
    else
    {
        result = (count / frequency_()) * interval_type(1000);
    }

    return result;
}

inline performance_counter::interval_type performance_counter::get_microseconds() const
{
    interval_type   result;
    interval_type   count   =   get_period_count();

#ifdef STLSOFT_CF_64BIT_INT_SUPPORT
    if(count < STLSOFT_GEN_SINT64_SUFFIX(0x8637BD05AF6))
#else /* ? STLSOFT_CF_64BIT_INT_SUPPORT */
    if(count < interval_type(0x863, 0x7BD05AF6))
#endif /* !STLSOFT_CF_64BIT_INT_SUPPORT */
    {
        result = (count * interval_type(1000000)) / frequency_();
    }
    else
    {
        result = (count / frequency_()) * interval_type(1000000);
    }

    return result;
}


inline performance_counter::interval_type performance_counter::stop_get_period_count_and_restart()
{
    stop();

    interval_type   interval    =   get_period_count();

    m_start = m_end;

    return interval;
}

inline performance_counter::interval_type performance_counter::stop_get_seconds_and_restart()
{
    stop();

    interval_type   interval    =   get_seconds();

    m_start = m_end;

    return interval;
}

inline performance_counter::interval_type performance_counter::stop_get_milliseconds_and_restart()
{
    stop();

    interval_type   interval    =   get_milliseconds();

    m_start = m_end;

    return interval;
}

inline performance_counter::interval_type performance_counter::stop_get_microseconds_and_restart()
{
    stop();

    interval_type   interval    =   get_microseconds();

    m_start = m_end;

    return interval;
}

#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

/* ////////////////////////////////////////////////////////////////////// */

#ifndef _WINSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
} // namespace winstl
# else
} // namespace winstl_project
} // namespace stlsoft
# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_WINSTL_NO_NAMESPACE */

/* ////////////////////////////////////////////////////////////////////// */

#endif /* !WINSTL_INCL_WINSTL_PERFORMANCE_HPP_PERFORMANCE_COUNTER */

/* ////////////////////////////////////////////////////////////////////// */