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#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <mmsystem.h>
#include <sys/time.h>
static LARGE_INTEGER qwTimerFrequency;
static LARGE_INTEGER qwTimerStart;
static LARGE_INTEGER m_lStartTime;
static float m_fuSecsPerTick;
static unsigned long RelativeTime = 0;
int usec_sleep(int usec_delay)
{
LARGE_INTEGER qwStartTicks, qwCurrTicks;
double dResult;
long lTick;
double fuSecDelay = ((float) usec_delay) / 1000000.0;
QueryPerformanceCounter(&qwStartTicks);
do {
QueryPerformanceCounter(&qwCurrTicks);
dResult =
((double) (qwCurrTicks.QuadPart - qwStartTicks.QuadPart)) /
((double) (qwTimerFrequency.QuadPart));
} while (dResult < fuSecDelay);
}
// Returns current time in microseconds
unsigned long GetTimer()
{
LARGE_INTEGER qwTime;
FLOAT fTime;
UINT64 uiQuadPart;
QueryPerformanceCounter(&qwTime);
qwTime.QuadPart -= m_lStartTime.QuadPart;
uiQuadPart = (UINT64) qwTime.QuadPart;
uiQuadPart /= ((UINT64) 10); // prevent overflow after 4294.1 secs, now overflows after 42941 secs
fTime = ((FLOAT) (uiQuadPart)) / m_fuSecsPerTick;
return (unsigned long) fTime;
}
// Returns current time in microseconds
float GetRelativeTime()
{
unsigned long t, r;
t = GetTimer();
r = t - RelativeTime;
RelativeTime = t;
return (float) r *0.000001F;
}
// Returns current time in milliseconds
unsigned int GetTimerMS()
{
return GetTimer() / 1000;
}
void InitTimer()
{
FLOAT t;
QueryPerformanceFrequency(&qwTimerFrequency); // ticks/sec
m_fuSecsPerTick = (FLOAT) (((FLOAT) (qwTimerFrequency.QuadPart)) / 1000.0); // tics/msec
m_fuSecsPerTick = (FLOAT) (m_fuSecsPerTick / 1000.0); // ticks/usec
m_fuSecsPerTick /= 10.0;
QueryPerformanceCounter(&m_lStartTime);
t = GetRelativeTime();
}
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