float32 Timer::GetTimeDelta(TimerRecord record1, TimerRecord record2)
{
static float32 frequency = 0.0f;
if (frequency == 0.0f)
{
uint64 frequencyU64 = 0;
QueryPerformanceFrequency(PLARGE_INTEGER(&frequencyU64));
frequency = float32(frequencyU64);
}
return float32(record2 - record1) / frequency;
}
void Jtag::Usleep(unsigned int usec)
{
io->flush_tms(false);
io->flush();
#ifdef __WIN32__
if (usec < 11000)
/* Busy wait, as scheduler prolongs all waits for to least 10 ms
http://sourceforge.net/apps/trac/scummvm/browser/vendor/freesci/\
glutton/src/win32/usleep.c?rev=38187
*/
{
LARGE_INTEGER lFrequency;
LARGE_INTEGER lEndTime;
LARGE_INTEGER lCurTime;
QueryPerformanceFrequency (&lFrequency);
if (lFrequency.QuadPart)
{
QueryPerformanceCounter (&lEndTime);
lEndTime.QuadPart += (LONGLONG) usec * lFrequency.QuadPart / 1000000;
do
{
QueryPerformanceCounter (&lCurTime);
Sleep(0);
} while (lCurTime.QuadPart < lEndTime.QuadPart);
}
}
else
{
/* from http://forums.devx.com/showthread.php?p=518756 without overheade calculation*/
HANDLE timer = CreateWaitableTimer( 0, true, 0 ) ;
__int64 due_time = - ( __int64)usec * 10 ; // time in 100 nanosecond units
SetWaitableTimer( timer, PLARGE_INTEGER(&due_time), 0, 0, 0, 0 ) ;
DWORD result = WaitForSingleObject( timer, INFINITE ) ;
CloseHandle( timer ) ;
if(result !=WAIT_OBJECT_0)
fprintf(stderr,"Usleep failed\n");
}
#else
usleep(usec);
#endif
}
void Timer::Initialize()
{
uint64 frequencyU64 = 0;
QueryPerformanceFrequency(PLARGE_INTEGER(&frequencyU64));
frequency = float32(frequencyU64);
}
TimerRecord Timer::GetRecord()
{
uint64 record = 0;
QueryPerformanceCounter(PLARGE_INTEGER(&record));
return TimerRecord(record);
}
