C++ Microseconds函数代码示例

/* If this function is NULL, polling is not needed */
static int display_update(void *handle, void *device,
    int x, int y, int w, int h)
{
    UInt64 t1;
    UInt64 t2;
    int delta;
    IMAGE *img = image_find(handle, device);
    if (img == NULL)
       return -1;

    Microseconds((UnsignedWide*)&t1);
    delta = (t1 - img->update_time) / 1000000L;
    if (img->update_interval < 1)
    img->update_interval = 1;    /* seconds */
    if (delta < 0)
        img->update_time = t1;
    else if (delta > img->update_interval)
    {
        /* redraw window */
        window_invalidate(img->windowRef);

        /* Make sure the update interval is at least 10 times
         * what it takes to paint the window
         */
        Microseconds((UnsignedWide*)&t2);
        delta = (t2 - t1) / 1000;
        if (delta < 0)
            delta += 60000;    /* delta = time to redraw */
        if (delta > img->update_interval * 100)
            img->update_interval = delta/100;
        img->update_time = t2;
    }

    return gsdll_poll(handle);
}

/* _GSocket_Output_Timeout:
 *  For blocking sockets, wait until data can be sent without
 *  blocking or until timeout ellapses.
 */
GSocketError _GSocket_Output_Timeout(GSocket *socket)
{
  if ( !socket->m_non_blocking )
  {
    UnsignedWide now , start ;
    short formerTakesEvents = socket->m_takesEvents ;
    Microseconds(&start);
    now = start ;
    socket->m_takesEvents = FALSE ;

    while( (now.hi * 4294967296.0 + now.lo) - (start.hi * 4294967296.0 + start.lo) < socket->m_timeout * 1000.0 )
    {
    	OTResult state ;
 		state = OTGetEndpointState(socket->m_endpoint);

  		if ( state == T_DATAXFER || state == T_INREL )
 		{
        	socket->m_takesEvents = formerTakesEvents ;
  			return GSOCK_NOERROR;
    	}
    	Microseconds(&now);
    }
    socket->m_takesEvents = formerTakesEvents ;
    socket->m_error = GSOCK_TIMEDOUT;
    return GSOCK_TIMEDOUT;
  }
  return GSOCK_NOERROR;
}

TEST(DurationTest, Timeval)
{
  EXPECT_EQ(Duration(timeval{10, 0}), Seconds(10));
  EXPECT_EQ(Duration(timeval{0, 7}), Microseconds(7));
  EXPECT_EQ(Duration(timeval{2, 123}), Seconds(2) + Microseconds(123));

  timeval t{2, 123};
  Duration d(t);
  EXPECT_EQ(d.timeval().tv_sec, t.tv_sec);
  EXPECT_EQ(d.timeval().tv_usec, t.tv_usec);

  t.tv_usec = 0;
  d = Duration(t);
  EXPECT_EQ(d.timeval().tv_sec, t.tv_sec);
  EXPECT_EQ(d.timeval().tv_usec, t.tv_usec);

  // Negative times.
  t.tv_sec = 0;
  t.tv_usec = -1;
  d = Duration(t);
  EXPECT_EQ(d.timeval().tv_sec, t.tv_sec);
  EXPECT_EQ(d.timeval().tv_usec, t.tv_usec);

  d = Microseconds(-1);
  EXPECT_EQ(d.timeval().tv_sec, t.tv_sec);
  EXPECT_EQ(d.timeval().tv_usec, t.tv_usec);

  t.tv_sec = -1;
  t.tv_usec = -30;
  d = Duration(t);
  EXPECT_EQ(d.timeval().tv_sec, t.tv_sec);
  EXPECT_EQ(d.timeval().tv_usec, t.tv_usec);
}

static void * SoundTask(void *)
{
	long long			curt;
	static long long	last;

	Microseconds((UnsignedWide *) &last);

	while (!stopNow)
	{
		if (!mboxPause)
		{
			if (musicboxmode == kMBXSoundEmulation)
				SPCPlayExec();
			else
				S9xMainLoop();
		}

		last += (1000000 / Memory.ROMFramesPerSecond);
		Microseconds((UnsignedWide *) &curt);

		if (last > curt)
			usleep(last - curt);
	}

	return nil;
}

int main(int argc, char *argv[]) {
    int i, j, k, ret, loops, freq, log2_N, jobs, N, mb = mbox_open();
    unsigned t[2];
    double tsq[2];

    GPU_FFT_COMPLEX *base;
    struct GPU_FFT *fft;

    log2_N = argc>1? atoi(argv[1]) : 12; // 8 <= log2_N <= 21
    jobs   = argc>2? atoi(argv[2]) : 1;  // transforms per batch
    loops  = argc>3? atoi(argv[3]) : 1;  // test repetitions

    if (argc<2 || jobs<1 || loops<1) {
        printf(Usage);
        return -1;
    }

    N = 1<<log2_N; // FFT length
    ret = gpu_fft_prepare(mb, log2_N, GPU_FFT_REV, jobs, &fft); // call once

    switch(ret) {
        case -1: printf("Unable to enable V3D. Please check your firmware is up to date.\n"); return -1;
        case -2: printf("log2_N=%d not supported.  Try between 8 and 21.\n", log2_N);         return -1;
        case -3: printf("Out of memory.  Try a smaller batch or increase GPU memory.\n");     return -1;
        case -4: printf("Unable to map Videocore peripherals into ARM memory space.\n");      return -1;
    }

    for (k=0; k<loops; k++) {

        for (j=0; j<jobs; j++) {
            base = fft->in + j*fft->step; // input buffer
            for (i=0; i<N; i++) base[i][0] = base[i][1] = 0;
            freq = j+1;
            base[freq][0] = base[N-freq][0] = 0.5;
        }

        usleep(1); // Yield to OS
        t[0] = Microseconds();
        gpu_fft_execute(fft); // call one or many times
        t[1] = Microseconds();

        tsq[0]=tsq[1]=0;
        for (j=0; j<jobs; j++) {
            base = fft->out + j*fft->step; // output buffer
            freq = j+1;
            for (i=0; i<N; i++) {
                double re = cos(2*GPU_FFT_PI*freq*i/N);
                tsq[0] += pow(re, 2);
                tsq[1] += pow(re - base[i][0], 2) + pow(base[i][1], 2);
            }
        }

        printf("rel_rms_err = %0.2g, usecs = %d, k = %d\n",
            sqrt(tsq[1]/tsq[0]), (t[1]-t[0])/jobs, k);
    }

    gpu_fft_release(fft); // Videocore memory lost if not freed !
    return 0;
}

void
TclpGetTime(
    Tcl_Time *timePtr)		/* Location to store time information. */
{
    UnsignedWide micro;
#ifndef NO_LONG_LONG
    long long *microPtr;
#endif
	
    if (initalized == false) {
        MachineLocation loc;
        long int offset;
    
        ReadLocation(&loc);
        offset = loc.u.gmtDelta & 0x00ffffff;
        if (offset & 0x00800000) {
            offset = offset | 0xff000000;
	}
	if (ReadDateTime(&baseSeconds) != noErr) {
	    /*
	     * This should never happen!
	     */
	    return;
	}
	/*
	 * Remove the local offset that ReadDateTime() adds.
	 */
	baseSeconds -= offset;
	Microseconds(&microOffset);
	initalized = true;
    }

    Microseconds(&micro);

#ifndef NO_LONG_LONG
    microPtr = (long long *) µ
    *microPtr -= *((long long *) &microOffset);
    timePtr->sec = baseSeconds + (*microPtr / 1000000);
    timePtr->usec = *microPtr % 1000000;
#else
    SubtractUnsignedWide(&micro, &microOffset, &micro);

    /*
     * This lovely computation is equal to: base + (micro / 1000000)
     * For the .hi part the ratio of 0x100000000 / 1000000 has been
     * reduced to avoid overflow.  This computation certainly has 
     * problems as the .hi part gets large.  However, your application
     * would have to run for a long time to make that happen.
     */

    timePtr->sec = baseSeconds + (micro.lo / 1000000) + 
    	(long) (micro.hi * ((double) 33554432.0 / 15625.0));
    timePtr->usec = micro.lo % 1000000;
#endif
}

float Sys_Timer(void) {
    static UInt64 start = 0;
    UInt64 counter = 0;

    if (start == 0) {
        Microseconds((UnsignedWide *)&start);
        return 0.0f;
    }

    Microseconds((UnsignedWide *)&counter);
    return (counter - start) / 1000000.0f;
}

	void GLtexture::copyFramebuffer(const Rect& r)
	{
		glBindTexture(GL_TEXTURE_2D, getObject());

		glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, r.x, r.y, r.width, r.height);
#if 0
		ulonglong_t start = Microseconds();

		ulonglong_t end = Microseconds();
		Printf("GLtexture::copyFramebuffer: %d microseconds\n", end - start);
		GLrender::checkErrors();
#endif
	}

void flext::Sleep(double s)
{
    if(s <= 0) return;
#if FLEXT_OS == FLEXT_OS_WIN
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x400
#if 0
    LARGE_INTEGER liDueTime;
    liDueTime.QuadPart = (LONGLONG)(-1.e7*s);

    // Create a waitable timer.
    HANDLE hTimer = CreateWaitableTimer(NULL,TRUE,NULL);
    if(hTimer) {
        if(SetWaitableTimer(hTimer,&liDueTime,0,NULL,NULL,0))
            // Wait for the timer.
            WaitForSingleObject(hTimer,INFINITE); // != WAIT_OBJECT_0)
        else
            ::Sleep((long)(s*1000.));
        CloseHandle(hTimer);
    }
    else
#else
    LARGE_INTEGER cnt;
    if(perffrq && QueryPerformanceCounter(&cnt)) {
        LONGLONG dst = (LONGLONG)(cnt.QuadPart+perffrq*s);
        for(;;) {
            SwitchToThread(); // while waiting switch to another thread
            QueryPerformanceCounter(&cnt);
            if(cnt.QuadPart > dst) break;
        }
    }
    else
#endif
#endif
        // last resort....
        ::Sleep((long)(s*1000.));
#elif FLEXT_OS == FLEXT_OS_LINUX || FLEXT_OS == FLEXT_OS_IRIX || FLEXT_OSAPI == FLEXT_OSAPI_MAC_MACH // POSIX
    usleep((long)(s*1000000.));
#elif FLEXT_OS == FLEXT_OS_MAC // that's just for OS9 & Carbon!
    UnsignedWide tick;
    Microseconds(&tick);
    double target = tick.hi*((double)(1L<<((sizeof tick.lo)*4))*(double)(1L<<((sizeof tick.lo)*4)))+tick.lo+s*1.e6; 
    for(;;) {
        // this is just a loop running until the time has passed - stone age (but we yield at least)
        Microseconds(&tick);
        if(target <= tick.hi*((double)(1L<<((sizeof tick.lo)*4))*(double)(1L<<((sizeof tick.lo)*4)))+tick.lo) break;
        YieldToAnyThread(); // yielding surely reduces the timing precision (but we're civilized)
    }
#else
    #error Not implemented
#endif
}

void ProfileOperaPop() // PROFILE_OPERA_POP(x)
{
	if (s_profile_opera_file && s_profile_opera_data.GetCount())
	{
		unsigned long long current_time;
		Microseconds((UnsignedWide*) &current_time);

		ProfileOperaData* data = s_profile_opera_data.Remove(s_profile_opera_data.GetCount()-1);

		unsigned long long long_delta = current_time - data->m_start_time;
		unsigned int delta = (unsigned long)((long_delta+500)/1000);

		if (delta >= 10)
		{
			for (UINT32 i = 0; i < s_profile_opera_data.GetCount(); i++)
			{
				fprintf(s_profile_opera_file, "    ");
			}
			fprintf(s_profile_opera_file,"%08llu: %4u\n", data->m_unique_id, delta);
			fflush(s_profile_opera_file);
		}

		delete data;
	}
}

/*
 * This function is called every time the random pool needs
 * stirring, and will acquire the system time.
 */
void noise_get_light(void (*func) (void *, int))
{
    UnsignedWide utc;

    Microseconds(&utc);
    func(&utc, sizeof(utc));
}

NMUInt32 GetTimestampMilliseconds()
{
	NMUInt32		timestamp = 0;
	NMUInt32 		clocksPerSec;
	
#ifdef OP_PLATFORM_MAC_CFM
	double		clocks;
#else
	clock_t		clocks;
#endif


#ifdef OP_PLATFORM_MAC_CFM
	UnsignedWide mSeconds;
	clocksPerSec = 1000000;  // Magic Number = Microseconds
	Microseconds( &mSeconds );
    
	// Convert to appropriate type in the floating point domain
	clocks = ( mSeconds.hi * 4294967296.0 + mSeconds.lo );
	 
#else
	clocksPerSec = MACHINE_TICKS_PER_SECOND;
	clocks = machine_tick_count();

#endif

	timestamp = (NMUInt32)((clocks / (double)clocksPerSec) * (double)MILLISECS_PER_SEC);

	return timestamp;
}

globle double gentime()
  {
#if   MAC
   UnsignedWide result;

   Microseconds(&result);

   return(((((double) result.hi) * kTwoPower32) + result.lo) / 1000000.0);
#endif

#if IBM_MCW
   unsigned long int result;

   result = GetTickCount();

   return((double) result / 1000.0);
#endif

#if   IBM_TBC && (! WINDOW_INTERFACE)
   unsigned long int result;

   result = biostime(0,(long int) 0);

   return((double) result / 18.2);
#endif

#if GENERIC || (! MAC)
   return((double) clock() / (double) CLOCKS_PER_SEC);
#endif
  }

double flext::GetOSTime()
{
    double tm;

#if FLEXT_OS == FLEXT_OS_WIN
    LARGE_INTEGER cnt;
    if(perffrq && QueryPerformanceCounter(&cnt))
        tm = cnt.QuadPart/perffrq;
    else {
        SYSTEMTIME systm;
        FILETIME fltm;
        GetSystemTime(&systm);
        SystemTimeToFileTime(&systm,&fltm);
        tm = ((LARGE_INTEGER *)&fltm)->QuadPart*1.e-7;
    }
#elif FLEXT_OS == FLEXT_OS_LINUX || FLEXT_OS == FLEXT_OS_IRIX || FLEXT_OSAPI == FLEXT_OSAPI_MAC_MACH // POSIX
    timeval tmv;
    gettimeofday(&tmv,NULL);
    tm = tmv.tv_sec+tmv.tv_usec*1.e-6;
#elif FLEXT_OS == FLEXT_OS_MAC // that's just for OS9 & Carbon!
    UnsignedWide tick;
    Microseconds(&tick);
    tm = (tick.hi*((double)(1L<<((sizeof tick.lo)*4))*(double)(1L<<((sizeof tick.lo)*4)))+tick.lo)*1.e-6; 
#else
    #error Not implemented
#endif
    return tm-starttime;
}

UINT32 macos_gettick(void) {

	UnsignedWide current;

	Microseconds(&current);
	return((UINT32)((current.hi * 4294967) + (current.lo / 1000)));
}