Common game loop's sleep

SimpleSleepSync.c

#include <windows.h>

void SleepSync(int targetFps)
{
    static DWORD previous = 0;
    if (previous == 0)
        previous = GetTickCount();
    LONGLONG current = GetTickCount();
    LONGLONG sleepTime = (1000 / targetFps) - (current - previous);
    previous = current;
    if (sleepTime > 0)
        Sleep(sleepTime);
}

SleepSync.c

#include <windows.h>

double SleepSyncTime()
{
    double frequency;
    double counter;
    QueryPerformanceFrequency((LARGE_INTEGER*) &frequency);
    QueryPerformanceCounter((LARGE_INTEGER*) &counter);
    return counter / frequency;
}

void SleepSync(double targetFps)
{
    static double previous = 0.0;
    if (previous == 0.0)
        previous = SleepSyncTime();
    double current = SleepSyncTime();
    double sleepTime = (1.0 / targetFps) - (current - previous);
    previous = current;
    if (sleepTime > 0.0)
        Sleep(sleepTime * 1000.0);
}