root/library/tests/unittest-cpp/Win32/TimeHelpers.cpp @ 418

#include "TimeHelpers.h"
#include <windows.h>

namespace UnitTest {

Timer::Timer()
        : m_threadHandle(::GetCurrentThread())
        , m_startTime(0)
{
#if defined(_MSC_VER) && (_MSC_VER == 1200) // VC6 doesn't have DWORD_PTR?
        typedef unsigned long DWORD_PTR;
#endif

        DWORD_PTR systemMask;
        ::GetProcessAffinityMask(GetCurrentProcess(), &m_processAffinityMask, &systemMask);
        ::SetThreadAffinityMask(m_threadHandle, 1);
        ::QueryPerformanceFrequency(reinterpret_cast< LARGE_INTEGER* >(&m_frequency));
        ::SetThreadAffinityMask(m_threadHandle, m_processAffinityMask);
}

void Timer::Start()
{
        m_startTime = GetTime();
}

double Timer::GetTimeInMs() const
{
        __int64 const elapsedTime = GetTime() - m_startTime;
        double const seconds = double(elapsedTime) / double(m_frequency);
        return seconds * 1000.0;
}

__int64 Timer::GetTime() const
{
        LARGE_INTEGER curTime;
        ::SetThreadAffinityMask(m_threadHandle, 1);
        ::QueryPerformanceCounter(&curTime);
        ::SetThreadAffinityMask(m_threadHandle, m_processAffinityMask);
        return curTime.QuadPart;
}

void TimeHelpers::SleepMs(int const ms)
{
        ::Sleep(ms);
}

}