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/* $Id: ntGetTimerResolution.cpp $ */
/** @file
* IPRT - Win32 (NT) testcase for getting the timer resolution.
*/
/*
* Copyright (C) 2006-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define _WIN32_WINNT 0x0500
#include <iprt/win/windows.h>
#include <iprt/types.h>
#include <stdio.h>
extern "C" {
/* from sysinternals. */
NTSYSAPI LONG NTAPI NtQueryTimerResolution(OUT PULONG MaximumResolution, OUT PULONG MinimumResolution, OUT PULONG CurrentResolution);
}
int main()
{
ULONG Min = UINT32_MAX;
ULONG Max = UINT32_MAX;
ULONG Cur = UINT32_MAX;
NtQueryTimerResolution(&Max, &Min, &Cur);
printf("NtQueryTimerResolution -> Max=%08luns Min=%08luns Cur=%08luns\n", Min * 100, Max * 100, Cur * 100);
#if 0
/* figure out the 100ns relative to the 1970 epoc. */
SYSTEMTIME st;
st.wYear = 1970;
st.wMonth = 1;
st.wDayOfWeek = 4; /* Thor's day. */
st.wDay = 1;
st.wHour = 0;
st.wMinute = 0;
st.wSecond = 0;
st.wMilliseconds = 0;
FILETIME ft;
if (SystemTimeToFileTime(&st, &ft))
{
printf("epoc is %I64u (0x%08x%08x)\n", ft, ft.dwHighDateTime, ft.dwLowDateTime);
if (FileTimeToSystemTime(&ft, &st))
printf("unix epoc: %d-%02d-%02d %02d:%02d:%02d.%03d (week day %d)\n",
st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);
else
printf("FileTimeToSystemTime failed, lasterr=%d\n", GetLastError());
}
else
printf("SystemTimeToFileTime failed, lasterr=%d\n", GetLastError());
ft.dwHighDateTime = 0;
ft.dwLowDateTime = 0;
if (FileTimeToSystemTime(&ft, &st))
printf("nt time start: %d-%02d-%02d %02d:%02d:%02d.%03d (week day %d)\n",
st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);
else
printf("FileTimeToSystemTime failed, lasterr=%d\n", GetLastError());
#endif
return 0;
}
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