C++ QueryPerformanceFrequency函数代码示例

StopWatch::StopWatch()
{
	timer.start.QuadPart = 0;
	timer.stop.QuadPart = 0; 
	QueryPerformanceFrequency(&frequency);
}

void InitCPUTicks()
{
    QueryPerformanceFrequency( &lfreq );
}

BOOL CSoundDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	

	ant_k_freq = _k_freq = 1;
	m_freq.SetRange(0,100);
	m_freq.SetPos(100-_k_freq*50);

	_volumen = 1;
	_left = 0.5;
	_right = 0.5;
	m_vol.SetRange(0,100);
	m_vol.SetPos((1-_volumen)*100);
	m_left.SetRange(0,100);
	m_left.SetPos((1-_left)*100);
	m_right.SetRange(0,100);
	m_right.SetPos((1-_right)*100);



	// Cargo el wav que voy a usar de muestreo
	char wav = QUE_WAV;
	switch(wav)
	{
		case 0:
			_cant_samples = generateWav("jet.wav",&_pcm);
			break;
		case 1:
			_cant_samples = generateWav("engine1.wav",&_pcm);
			break;
		case 2:
			_cant_samples = generateWav("spaceship.wav",&_pcm)*0.5;
			break;
	}
			

	_index = 0;
	WAVEFORMATEX   Format; 
	Format.cbSize = sizeof(WAVEFORMATEX);
	Format.wFormatTag = WAVE_FORMAT_PCM;
	Format.nChannels = 2;
	Format.nSamplesPerSec = SAMPLE_RATE;
	Format.wBitsPerSample = 16;
	Format.nBlockAlign = 4;
	Format.nAvgBytesPerSec = Format.nSamplesPerSec*Format.nBlockAlign;

	if(waveOutOpen(&hWaveOut, WAVE_MAPPER, &Format, (DWORD)GetSafeHwnd() , 
			0L,CALLBACK_WINDOW)!=MMSYSERR_NOERROR)
	{       
		return TRUE;
	}


	QueryPerformanceFrequency(&F);
	QueryPerformanceCounter(&T0);

	// Genereo el timer 
	SetTimer(999,lap=TIME_LAP,NULL);


	return TRUE;  // return TRUE  unless you set the focus to a control
}

void TEST_SPEED_FILE_IO()
{
	LARGE_INTEGER freq, perf_start, perf_end;
	float freqms;
	QueryPerformanceFrequency(&freq);
	freqms = freq.QuadPart / 1000.0f;

	std::cout << "Testing file read" << '\n';
	float arr1[10267 * 3];
	float arr2[10267 * 3];
	float arr3[10267 * 3];


	// C style
	QueryPerformanceCounter(&perf_start);
	FILE* fr = fopen("test.bufa", "r");
	for (int i = 0; i < 10267 * 3; i++)
	{
		float temp;
		fscanf(fr, "%f", &temp);
		arr1[i] = temp;
	}
	QueryPerformanceCounter(&perf_end);
	float elapsedC = (perf_end.QuadPart - perf_start.QuadPart) / freqms;
	std::cout << "C style read\n";
	std::cout << "Total duration = " << elapsedC << "ms\n";
	fclose(fr);

	// C buffer style
	QueryPerformanceCounter(&perf_start);
	fr = fopen("test.bufa", "r");
	fseek(fr, 0, SEEK_END);
	long lSize = ftell(fr);
	rewind(fr);
	char* buffer = (char*)malloc(sizeof(char)*lSize);
	fread(buffer, 1, lSize, fr);
	std::stringstream ss(buffer);
	for (int i = 0; i < 10267 * 3; i++)
	{
		float temp;
		ss >> temp;
		arr2[i] = temp;
	}
	QueryPerformanceCounter(&perf_end);
	float elapsedCbuf = (perf_end.QuadPart - perf_start.QuadPart) / freqms;
	std::cout << "C buffer with stringstream style read\n";
	std::cout << "Total duration = " << elapsedCbuf << "ms\n";
	fclose(fr);

	// C++ style
	std::ifstream f;
	const int N = sizeof(float) * 10267 * 3;
	char buff[N];
	f.rdbuf()->pubsetbuf(buff, N);
	f.open("test.bufa", std::ios::in | std::ios::binary);
	QueryPerformanceCounter(&perf_start);
	for (int i = 0; i < 10267 * 3; i++)
	{
		float temp;
		f >> temp;
		arr3[i] = temp;
	}
	QueryPerformanceCounter(&perf_end);
	float elapsedCpp = (perf_end.QuadPart - perf_start.QuadPart) / freqms;
	std::cout << "C++ style read\n";
	std::cout << "Total duration = " << elapsedCpp << "ms\n";
	f.close();
}

//程序运行  
int CCApplication::run()  
{  
    //设置注册表PVRFrame隐藏  
    PVRFrameEnableControlWindow(false);  
    //主消息循环  
    MSG msg;  
    LARGE_INTEGER nFreq;  
    LARGE_INTEGER nLast;  
    LARGE_INTEGER nNow;  
//WINDOWS高精度定时器的用法，先获取频率  
QueryPerformanceFrequency(&nFreq);  
//获取当前的计数值,即频率x当前时间  
    QueryPerformanceCounter(&nLast);  
	//initInstance函数为虚函数，由派生类AppDelegate进行了重载。此段代码在调用AppDelegate重载的initInstance函数之后调用applicationDidFinishLaunching函数完成一些初始化处理。  
	//注:AppDelegate重载initInstance函数做了什么我们暂且只先认为它如平时我们WINDOWS基本框架程序一样创建了一个Windows窗口。【伏笔1后面会有讲解】。  
    if (! initInstance() || ! applicationDidFinishLaunching())  
    {  
        return 0;  
    }  
//取得当前使用的OPENGL窗口管理实例对象  
CCEGLView& mainWnd = CCEGLView::sharedOpenGLView();  
//将窗口居中显示  
    mainWnd.centerWindow();  
    ShowWindow(mainWnd.getHWnd(), SW_SHOW);  
//非常熟悉!进入WINDOWS消息循环  
    while (1)  
{  
   //如果没有获取到WINDOWS消息  
        if (! PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))  
        {  
            // 取得当前的计数值,即频率x当前时间  
            QueryPerformanceCounter(&nNow);  
            //m_nAnimationInterval.QuadPart的值 为setAnimationInterval函数进行设置的固定值。此处是为了判断时间流逝了多久，是否应该更新显示设备  
            if (nNow.QuadPart - nLast.QuadPart > m_nAnimationInterval.QuadPart)  
            {  
  //如果时间流逝达到了设定的FPS时间差，则更新计数值。  
                nLast.QuadPart = nNow.QuadPart;  
  //这里是设备渲染场景的函数，【伏笔2后面会有讲解】   
                CCDirector::sharedDirector()->mainLoop();  
            }  
            else  
            {  
  //sleep0秒的意义是让CPU做下时间片切换，防止死循环而使系统其它程序得不到响应。  
                Sleep(0);  
            }  
            continue;  
        }  
   //有消息获取到  
        if (WM_QUIT == msg.message)  
        {  
   // 如果获取的消息是退出则退出循环。  
            break;  
        }  
        // 如果没有定义加速键或者处理完加速键信息  
        if (! m_hAccelTable || ! TranslateAccelerator(msg.hwnd, m_hAccelTable, &msg))  
        {  
   //处理Windows消息  
            TranslateMessage(&msg);  
            DispatchMessage(&msg);  
        }  
    }  
    return (int) msg.wParam;  
}  

//.........这里部分代码省略.........
        {
            int i;
            ERR_RPT(("Creation of requested Audio Output device '%s' failed.\n",
                     ((pad->pad_lpGUID == NULL) ? "Default" : pad->pad_Info.name) ));
            for( i=0; i<Pa_CountDevices(); i++ )
            {
                pad = Pa_GetInternalDevice( i );
                if( pad->pad_Info.maxOutputChannels >= past->past_NumOutputChannels )
                {
                    DBUG(("Try device '%s' instead.\n", pad->pad_Info.name ));
                    hr = DirectSoundCreate( pad->pad_lpGUID, &dsw->dsw_pDirectSound,   NULL );
                    if( hr == DS_OK )
                    {
                        ERR_RPT(("Using device '%s' instead.\n", pad->pad_Info.name ));
                        break;
                    }
                }
            }
        }
        if( hr != DS_OK )
        {
            ERR_RPT(("PortAudio: DirectSoundCreate() failed!\n"));
            result = paHostError;
            sPaHostError = hr;
            goto error;
        }
        hr = DSW_InitOutputBuffer( dsw,
                                   (unsigned long) (past->past_SampleRate + 0.5),
                                   past->past_NumOutputChannels, numBytes );
        DBUG(("DSW_InitOutputBuffer() returns %x\n", hr));
        if( hr != DS_OK )
        {
            result = paHostError;
            sPaHostError = hr;
            goto error;
        }
        past->past_FrameCount = pahsc->pahsc_DSoundWrapper.dsw_FramesWritten;
    }
#if SUPPORT_AUDIO_CAPTURE
    /* ------------------ INPUT */
    if( (past->past_InputDeviceID >= 0) && (past->past_NumInputChannels > 0) )
    {
        pad = Pa_GetInternalDevice( past->past_InputDeviceID );
        hr = DirectSoundCaptureCreate( pad->pad_lpGUID, &dsw->dsw_pDirectSoundCapture,   NULL );
        /* If this fails, then try each input device until we find one that works. */
        if( hr != DS_OK )
        {
            int i;
            ERR_RPT(("Creation of requested Audio Capture device '%s' failed.\n",
                     ((pad->pad_lpGUID == NULL) ? "Default" : pad->pad_Info.name) ));
            for( i=0; i<Pa_CountDevices(); i++ )
            {
                pad = Pa_GetInternalDevice( i );
                if( pad->pad_Info.maxInputChannels >= past->past_NumInputChannels )
                {
                    PRINT(("Try device '%s' instead.\n", pad->pad_Info.name ));
                    hr = DirectSoundCaptureCreate( pad->pad_lpGUID, &dsw->dsw_pDirectSoundCapture,   NULL );
                    if( hr == DS_OK ) break;
                }
            }
        }
        if( hr != DS_OK )
        {
            ERR_RPT(("PortAudio: DirectSoundCaptureCreate() failed!\n"));
            result = paHostError;
            sPaHostError = hr;
            goto error;
        }
        hr = DSW_InitInputBuffer( dsw,
                                  (unsigned long) (past->past_SampleRate + 0.5),
                                  past->past_NumInputChannels, numBytes );
        DBUG(("DSW_InitInputBuffer() returns %x\n", hr));
        if( hr != DS_OK )
        {
            ERR_RPT(("PortAudio: DSW_InitInputBuffer() returns %x\n", hr));
            result = paHostError;
            sPaHostError = hr;
            goto error;
        }
    }
#endif /* SUPPORT_AUDIO_CAPTURE */
    /* Calculate scalar used in CPULoad calculation. */
    {
        LARGE_INTEGER frequency;
        if( QueryPerformanceFrequency( &frequency ) == 0 )
        {
            pahsc->pahsc_InverseTicksPerUserBuffer = 0.0;
        }
        else
        {
            pahsc->pahsc_InverseTicksPerUserBuffer = past->past_SampleRate /
                    ( (double)frequency.QuadPart * past->past_FramesPerUserBuffer );
            DBUG(("pahsc_InverseTicksPerUserBuffer = %g\n", pahsc->pahsc_InverseTicksPerUserBuffer ));
        }
    }
    return result;
error:
    PaHost_CloseStream( past );
    return result;
}

//.........这里部分代码省略.........
		queue.enqueueWriteBuffer(bufferD,CL_TRUE,0,n*d*sizeof(float),data);
		queue.enqueueWriteBuffer(bufferC,CL_TRUE,0,d*k*sizeof(float),centroid);

		//read the program source
		std::ifstream sourceFile("kmeans_kernel.cl");
		std::string sourceCode(std::istreambuf_iterator<char>(sourceFile),(std::istreambuf_iterator<char>()));
		cl::Program::Sources source(1,std::make_pair(sourceCode.c_str(),sourceCode.length()+1));

		//make program from source code
		cl::Program program=cl::Program(context,source);

		//build the program for the devices
		program.build(devices);

		//make kernel
		//cl::Kernel vecadd_kernel(program,"kmeans");
		cl::Kernel vecadd_kernel(program,"kmeans2");

		//set the kernel arguments
		vecadd_kernel.setArg(0,bufferD);
		vecadd_kernel.setArg(1,bufferC);
		//vecadd_kernel.setArg(2,bufferDS); //kmeans
		vecadd_kernel.setArg(2,bufferClusterI); //kmeans2
		vecadd_kernel.setArg(3,n);
		vecadd_kernel.setArg(4,d);
		vecadd_kernel.setArg(5,k);

		//execute the kernel
		cl::NDRange global(n);
		cl::NDRange local(256);
		cl::Event timing_event; //perf
		//cl_int err_code; //perf
		queue.enqueueNDRangeKernel(vecadd_kernel,cl::NullRange,global,local,NULL,&timing_event);
		queue.finish();

		cl_ulong gpu_starttime;
		cl_ulong gpu_endtime;
		gpu_starttime = timing_event.getProfilingInfo<CL_PROFILING_COMMAND_START>();
		gpu_endtime = timing_event.getProfilingInfo<CL_PROFILING_COMMAND_END>();

		double gpu_ms = 1e-6 * (gpu_endtime-gpu_starttime); //not sure where the 1e-6 came from, but AMD used 1e-9 for seconds
		std::cout<<"GPU kmeans time="<<gpu_ms<<" milliseconds"<<std::endl;

		//copy the output data back to the host
		//queue.enqueueReadBuffer(bufferDS,CL_TRUE,0,n*k*sizeof(float),dist2); //kmeans
		queue.enqueueReadBuffer(bufferClusterI,CL_TRUE,0,n*sizeof(int),clusterI); //kmeans2

		//check the output - kmeans
		//for (int i=0; i<n; i++) { //loop through all data lines
		//	std::cout<<"dist2 i="<<i<<" : ";
		//	for (int c=0; c<k; c++) { //loop through all centroids and compare this line to each
		//		float sum=0;
		//		for (int j=0; j<d; j++) { //loop through all values on each data line (dimensionality of data points)
		//			sum+=pow(data[i*d+j]-centroid[c*d+j],2);
		//		}
		//		float gpu_value = dist2[i*k+c];
		//		float error = gpu_value-sum; //error between this data point and centroid c location
		//		std::cout<<error<<"  ";
		//	}
		//	std::cout<<std::endl;
		//}

		//Do a CPU version of kmeans to check the GPU data against
		int *cpu_clusterI=new int[n];
		LARGE_INTEGER frequency,counter1,counter2;
		QueryPerformanceFrequency(&frequency); //returns counts per second
		QueryPerformanceCounter(&counter1);
		kmeans_cpu(data,centroid,cpu_clusterI,n,d,k);
		QueryPerformanceCounter(&counter2);
		float t_ms=((float)(counter2.LowPart-counter1.LowPart))/(float)(frequency.LowPart)*1000; //milliseconds
		std::cout<<"CPU kmeans time="<<t_ms<<" milliseconds"<<std::endl;

		//check output - kmeans2
		bool result=true;
		for (int i=0; i<n; i++) { //loop through all data lines
			int gpu_index = clusterI[i]; //cluster index as calculated by the gpu
			int cpu_index = cpu_clusterI[i]; //cluster index as calculated by the cpu
			//std::cout<<"output i="<<i<<" : "<<gpu_index<<" "<<cpu_index<<std::endl;
			if (gpu_index!=cpu_index) {
				std::cout<<"Failed: "<<"output i="<<i<<" : "<<gpu_index<<" "<<cpu_index<<std::endl;
				result=false;
				break;
			}
		}
		if (result)
			std::cout<<"Success"<<std::endl;

		//and don't forget to clean up here
		delete [] data;
		delete [] centroid;
		//delete [] dist2;
		delete [] clusterI;
		delete [] cpu_clusterI;

	}
	catch (cl::Error error) {
		std::cout<<error.what()<<"("<<error.err()<<")"<<std::endl;
	}
	return 0;
}

//.........这里部分代码省略.........
	player.SetCurrentPort(eMapDest::South);
	Item* itemCi = new Item("Iron Ore", 1);
	player.getItems()->addItem(itemCi);
	Item* itemCb = new Item("Bronze Ore", 1);
	player.getItems()->addItem(itemCb);

	Vendor vN;
	Item* itemG = new Item("Gold Ore", 1000);
	vN.getItems()->addItem(itemG);
	Vendor vS;
	Item* itemI = new Item("Iron Ore", 1000);
	vS.getItems()->addItem(itemI);
	Vendor vE;
	Item* itemB = new Item("Bronze Ore", 1000);
	vE.getItems()->addItem(itemB);

	// Make the menus
	MainMenu mainMenu(device);

	MapMenu mapMenu(device, driver);
	mapMenu.SetPlayer(&player);

	TradeMenu tradeMenu(device, driver);
	tradeMenu.SetPlayer(&player);
	tradeMenu.SetVendor(&vS);

	CraftingMenu craftMenu(device, driver);
	craftMenu.SetPlayer(&player);

	//////////////////////////////////////////////////////////////////////////
	// Initialize timer to compute elapsed time between frames
	//////////////////////////////////////////////////////////////////////////
	__int64 cntsPerSec = 0;
	QueryPerformanceFrequency((LARGE_INTEGER*)&cntsPerSec);
	float secsPerCnt = 1.0f / (float)cntsPerSec;

	__int64 prevTimeStamp = 0;
	QueryPerformanceCounter((LARGE_INTEGER*)&prevTimeStamp);

	while (device->run())
	{
		//for scaling animation by time, not by frame
		__int64 currTimeStamp = 0;
		QueryPerformanceCounter((LARGE_INTEGER*)&currTimeStamp);
		float dt = (currTimeStamp - prevTimeStamp) * secsPerCnt;

		sun_node->setRotation(vector3df(sun_angle, 0.0f, 0.0f));
		sun_angle += dt;
		if ((sun_angle > 0 && sun_angle < 109) || (sun_angle>350))
		{
			timer++;
			if (timer > 10)
			{
				if (skyR < 100) skyR += 1;
				if (skyG < 100) skyG += 1;
				if (skyB < 140) skyB += 1;
				timer = 0;
			}
		}
		if (sun_angle > 170 && sun_angle < 330)
		{
			timer++;
			if (timer > 10)
			{
				if (skyR > 0) skyR -= 1;
				if (skyG > 0) skyG -= 1;

int __cdecl main(int argc,char *argv[])
{
	int i,arg, currit, modes, modenr;
	paramT *p;

#ifdef SHAREDMEM
	int shmid;
#endif

#ifdef WIN32
	DWORD procID;
	HANDLE hProcess;
	HANDLE hThread[10];
	DWORD IDThread;
	LARGE_INTEGER lpFrequency;
#endif

	p = (paramT*) malloc(MXPROC*sizeof(paramT));

	/* default initialisation */
	modes=0;
	p[0].mode=0;
	p[0].npes=NPES;
	p[0].mxsize=MXRUNSZ;
	p[0].minsize=MINRUNSZ;
	p[0].mxstrds=MXSTRDS;
	p[0].mxiters=MXIT;
	p[0].currentrep=1;
#ifdef HAVEOPT
	p[0].useoptasm=OPTASM;
#else
	p[0].useoptasm=0;
#endif
	arg=1;
	chartrev=CHARTREV;
	printf("\nECT memperf - Extended Copy Transfer Characterization\n");
	printf("Memory Performance Characterization Toolkit %s\n\n",VERSION);

#ifdef WIN32
	/* lookup clock frequency */
	QueryPerformanceFrequency(&lpFrequency);
	tic = (lpFrequency.LowPart / 1000000.0);
	tic += (lpFrequency.HighPart * (2^32) / 1000000.0);
#else
	tic=getcpufrequency();
#endif

	if (argc<2) {
#ifdef WIN32
		printf("Usage: %s -m <mode> [-p] [-s] [-n] [-r] [-i] [-c] [-o]\n",argv[0]);
#elif defined HAVEOPT
		printf("Usage: %s -m <mode> [-p] [-s] [-n] [-r] [-i] [-t] [-c] [-a] [-o]\n",argv[0]);
#else
		printf("Usage: %s -m <mode> [-p] [-s] [-n] [-r] [-i] [-t] [-c] [-o]\n",argv[0]);
#endif /*WIN32*/
		printf("       -m <mode>    :   0 = load sum test\n");
		printf("                        1 = const store test\n");
		printf("                        2 = load copy test\n");
		printf("                        3 = copy store test\n");
		printf("                        9 = all tests\n");
		printf("       [-c <nofrep> ]   Default: %d\n", NROFREP);
#ifdef HAVEOPT
		printf("       [-a <optasm> ]   0/1 = use/don't use special instructions\n");
		printf("                        2 = both methods, Default: %d\n", OPTASM);
#endif
		printf("       [-p <nProc>  ]   Default: %d\n",NPES);
		printf("       [-s <mxstrds>]   Default: %d\n",MXSTRDS);
		printf("       [-n <mxsize> ]   Default: %d (%d Bytes)\n",MXRUNSZ,8<<MXRUNSZ);
		printf("       [-r <minsize>]   Default: %d (%d Bytes)\n",MINRUNSZ,8<<MINRUNSZ);
		printf("       [-i <mxiters>]   Default: %d\n",MXIT);
		printf("       [-o          ]   Reversed Output\n");
#ifdef WIN32
		printf("       Evaluated clock resolution [MHz]: %.2f\n",tic);
#else
		printf("       [-t <tics/us>]   Default: %.2f\n",tic);
#endif
		exit(2);
	}

	while (arg<argc) {
		if (argv[arg][0]=='-') {
			if (argv[arg][1]=='p' && (arg+1)<argc) {
				arg++; p[0].npes=atoi(argv[arg]);
			}
			if (argv[arg][1]=='s' && (arg+1)<argc) {
				arg++; p[0].mxstrds=atoi(argv[arg]);
			}
			if (argv[arg][1]=='m' && (arg+1)<argc) {
				arg++; modes=atoi(argv[arg]);
			}
			if (argv[arg][1]=='n' && (arg+1)<argc) {
				arg++; p[0].mxsize=atoi(argv[arg]);
			}
			if (argv[arg][1]=='r' && (arg+1)<argc) {
				arg++; p[0].minsize=atoi(argv[arg]);
			}
			if (argv[arg][1]=='i' && (arg+1)<argc) {
				arg++; p[0].mxiters=atoi(argv[arg]);
			}
			if (argv[arg][1]=='o') {
//.........这里部分代码省略.........

// utilities
double claw_get_seconds (void) {
	LARGE_INTEGER count, frequency;
	QueryPerformanceFrequency (&frequency);
	QueryPerformanceCounter (&count);
	return (double)count.QuadPart/frequency.QuadPart;
}

RakNetTimeNS RakNet::GetTimeNS( void )
{
#if defined(_PS3)
	uint64_t curTime;
	if ( initialized == false)
	{
		ticksPerSecond = _PS3_GetTicksPerSecond();
		// Use the function to get elapsed ticks, this is a macro.
		_PS3_GetElapsedTicks(curTime);
		uint64_t quotient, remainder;
		quotient=(curTime / ticksPerSecond);
		remainder=(curTime % ticksPerSecond);
		initialTime = (RakNetTimeNS) quotient*(RakNetTimeNS)1000000 + (remainder*(RakNetTimeNS)1000000 / ticksPerSecond);
		initialized = true;
	}
#elif defined(_WIN32)
	// Win32
	if ( initialized == false)
	{
		initialized = true;

#if !defined(_WIN32_WCE)
		// Save the current process
		HANDLE mProc = GetCurrentProcess();

		// Get the current Affinity
#if _MSC_VER >= 1400 && defined (_M_X64)
		GetProcessAffinityMask(mProc, (PDWORD_PTR)&mProcMask, (PDWORD_PTR)&mSysMask);
#else
		GetProcessAffinityMask(mProc, &mProcMask, &mSysMask);
#endif

		mThread = GetCurrentThread();

#endif // !defined(_WIN32_WCE)

		QueryPerformanceFrequency( &yo );
	}
	// 01/12/08 - According to the docs "The frequency cannot change while the system is running." so this shouldn't be necessary
	/*
	if (++queryCount==200)
	{
		// Set affinity to the first core
		SetThreadAffinityMask(mThread, 1);

		QueryPerformanceFrequency( &yo );

		// Reset affinity
		SetThreadAffinityMask(mThread, mProcMask);

		queryCount=0;
	}
	*/

#elif (defined(__GNUC__)  || defined(__GCCXML__))
	if ( initialized == false)
	{
		gettimeofday( &tp, 0 );
		initialized=true;
		// I do this because otherwise RakNetTime in milliseconds won't work as it will underflow when dividing by 1000 to do the conversion
		initialTime = ( tp.tv_sec ) * (RakNetTimeNS) 1000000 + ( tp.tv_usec );
	}
#endif

#if defined(_PS3)
	// Use the function to get elapsed ticks, this is a macro.
	_PS3_GetElapsedTicks(curTime);
	uint64_t quotient, remainder;
	quotient=(curTime / ticksPerSecond);
	remainder=(curTime % ticksPerSecond);
	curTime = (RakNetTimeNS) quotient*(RakNetTimeNS)1000000 + (remainder*(RakNetTimeNS)1000000 / ticksPerSecond);
	// Subtract from initialTime so the millisecond conversion does not underflow
	return curTime - initialTime;
#elif defined(_WIN32)

	RakNetTimeNS curTime;
	static RakNetTimeNS lastQueryVal=(RakNetTimeNS)0;
//	static unsigned long lastTickCountVal = GetTickCount();

	LARGE_INTEGER PerfVal;

#if !defined(_WIN32_WCE)
	// Set affinity to the first core
	SetThreadAffinityMask(mThread, 1);
#endif // !defined(_WIN32_WCE)

	// Docs: On a multiprocessor computer, it should not matter which processor is called.
	// However, you can get different results on different processors due to bugs in the basic input/output system (BIOS) or the hardware abstraction layer (HAL). To specify processor affinity for a thread, use the SetThreadAffinityMask function.
	// Query the timer
	QueryPerformanceCounter( &PerfVal );

#if !defined(_WIN32_WCE)
	// Reset affinity
	SetThreadAffinityMask(mThread, mProcMask);
#endif // !defined(_WIN32_WCE)

	__int64 quotient, remainder;
	quotient=((PerfVal.QuadPart) / yo.QuadPart);
	remainder=((PerfVal.QuadPart) % yo.QuadPart);
	curTime = (RakNetTimeNS) quotient*(RakNetTimeNS)1000000 + (remainder*(RakNetTimeNS)1000000 / yo.QuadPart);
//.........这里部分代码省略.........

 CStopwatch() { QueryPerformanceFrequency(&m_liPerfFreq); Start(); }

CmcDateTime CmcDateTime::GetTimeNow ()
  {
static bool bFirstTime = true;

static CmcDateTime last_date;
static LARGE_INTEGER last_time;
static LONGLONG iCounterFrequency = 0;

  if (bFirstTime)
    {
    bFirstTime = false;
    LARGE_INTEGER large_int_frequency;
    if (QueryPerformanceFrequency (&large_int_frequency))
      {
      iCounterFrequency = large_int_frequency.QuadPart;
      QueryPerformanceCounter (&last_time);
      }
    }

  double secs = 0;
  LARGE_INTEGER time_now;

  if (iCounterFrequency)
    {
    QueryPerformanceCounter (&time_now);

    LONGLONG offset = time_now.QuadPart - last_time.QuadPart;
    secs = (double) offset / (double) iCounterFrequency;
//    TRACE ("Secs = %10.4f\n", secs);
    }
  else
    {
    time_now.QuadPart = 0;
    time_now.QuadPart = 0;
    }


  // if no high-performance counter, just query the time each time
  if (iCounterFrequency == 0 || 
      last_date.m_dt == 0 ||
      secs > RESYNC_EVERY_SECS)
    {
    SYSTEMTIME systime;
    GetLocalTime (&systime);
 	  last_date = CmcDateTime(systime.wYear, systime.wMonth,
		                  systime.wDay, systime.wHour, systime.wMinute,
		                  (double) systime.wSecond + ( (double) systime.wMilliseconds / 1000.0) );
    secs = 0;
    last_time = time_now;
    }

  CmcDateTime this_date (last_date);

  this_date.m_dt += secs / SECS_IN_DAY;

  // ---- debugging
#if 0
    {
    SYSTEMTIME systime;
    GetSystemTime (&systime);
 	  CmcDateTime test = CmcDateTime(systime.wYear, systime.wMonth,
		                  systime.wDay, systime.wHour, systime.wMinute,
		                  (double) systime.wSecond + ( (double) systime.wMilliseconds / 1000.0) );
    double diff = test.m_dt - this_date.m_dt;

    TRACE1 ("Time difference = %10.8f\n", diff);
    }

#endif
  // --- end debugging

  return this_date; 

  }

		PerformanceFreqHolder()
		{
			LARGE_INTEGER freq;
			QueryPerformanceFrequency(&freq);
			value = freq.QuadPart;
		}

int gettimeofday(struct timeval* tp, int* /*tz*/) {
  static LARGE_INTEGER tickFrequency, epochOffset;

  static Boolean isInitialized = False;

  LARGE_INTEGER tickNow;

#if !defined(_WIN32_WCE)
  QueryPerformanceCounter(&tickNow);
#else
  tickNow.QuadPart = GetTickCount();
#endif
 
  if (!isInitialized) {
    if(1 == InterlockedIncrement(&initializeLock_gettimeofday)) {
#if !defined(_WIN32_WCE)
      // For our first call, use "ftime()", so that we get a time with a proper epoch.
      // For subsequent calls, use "QueryPerformanceCount()", because it's more fine-grain.
      struct timeb tb;
      ftime(&tb);
      tp->tv_sec = tb.time;
      tp->tv_usec = 1000*tb.millitm;

      // Also get our counter frequency:
      QueryPerformanceFrequency(&tickFrequency);
#else
      /* FILETIME of Jan 1 1970 00:00:00. */
      const LONGLONG epoch = 116444736000000000LL;
      FILETIME fileTime;
      LARGE_INTEGER time;
      GetSystemTimeAsFileTime(&fileTime);

      time.HighPart = fileTime.dwHighDateTime;
      time.LowPart = fileTime.dwLowDateTime;

      // convert to from 100ns time to unix timestamp in seconds, 1000*1000*10
      tp->tv_sec = (long)((time.QuadPart - epoch) / 10000000L);

      /*
        GetSystemTimeAsFileTime has just a seconds resolution,
        thats why wince-version of gettimeofday is not 100% accurate, usec accuracy would be calculated like this:
        // convert 100 nanoseconds to usec
        tp->tv_usec= (long)((time.QuadPart - epoch)%10000000L) / 10L;
      */
      tp->tv_usec = 0;

      // resolution of GetTickCounter() is always milliseconds
      tickFrequency.QuadPart = 1000;
#endif     
      // compute an offset to add to subsequent counter times, so we get a proper epoch:
      epochOffset.QuadPart
          = tp->tv_sec * tickFrequency.QuadPart + (tp->tv_usec * tickFrequency.QuadPart) / 1000000L - tickNow.QuadPart;
      
      // next caller can use ticks for time calculation
      isInitialized = True; 
      return 0;
    } else {
        InterlockedDecrement(&initializeLock_gettimeofday);
        // wait until first caller has initialized static values
        while(!isInitialized){
          Sleep(1);
        }
    }
  }

  // adjust our tick count so that we get a proper epoch:
  tickNow.QuadPart += epochOffset.QuadPart;

  tp->tv_sec =  (long)(tickNow.QuadPart / tickFrequency.QuadPart);
  tp->tv_usec = (long)(((tickNow.QuadPart % tickFrequency.QuadPart) * 1000000L) / tickFrequency.QuadPart);

  return 0;
}