VirtualBox

source: vbox/trunk/src/VBox/Runtime/testcase/ntGetTimerResolution.cpp@ 30552

Last change on this file since 30552 was 28800, checked in by vboxsync, 15 years ago

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1/* $Id: ntGetTimerResolution.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */
2/** @file
3 * IPRT - Win32 (NT) testcase for getting the timer resolution.
4 */
5
6/*
7 * Copyright (C) 2006-2007 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*******************************************************************************
29* Header Files *
30*******************************************************************************/
31#define _WIN32_WINNT 0x0500
32#include <Windows.h>
33#include <stdio.h>
34
35extern "C" {
36/* from sysinternals. */
37NTSYSAPI LONG NTAPI NtQueryTimerResolution(OUT PULONG MaximumResolution, OUT PULONG MinimumResolution, OUT PULONG CurrentResolution);
38}
39
40
41int main()
42{
43 ULONG Min = ~0;
44 ULONG Max = ~0;
45 ULONG Cur = ~0;
46 NtQueryTimerResolution(&Max, &Min, &Cur);
47 printf("NtQueryTimerResolution -> Max=%08luns Min=%08luns Cur=%08luns\n", Min * 100, Max * 100, Cur * 100);
48
49#if 0
50 /* figure out the 100ns relative to the 1970 epoc. */
51 SYSTEMTIME st;
52 st.wYear = 1970;
53 st.wMonth = 1;
54 st.wDayOfWeek = 4; /* Thor's day. */
55 st.wDay = 1;
56 st.wHour = 0;
57 st.wMinute = 0;
58 st.wSecond = 0;
59 st.wMilliseconds = 0;
60
61 FILETIME ft;
62 if (SystemTimeToFileTime(&st, &ft))
63 {
64 printf("epoc is %I64u (0x%08x%08x)\n", ft, ft.dwHighDateTime, ft.dwLowDateTime);
65 if (FileTimeToSystemTime(&ft, &st))
66 printf("unix epoc: %d-%02d-%02d %02d:%02d:%02d.%03d (week day %d)\n",
67 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);
68 else
69 printf("FileTimeToSystemTime failed, lasterr=%d\n", GetLastError());
70 }
71 else
72 printf("SystemTimeToFileTime failed, lasterr=%d\n", GetLastError());
73
74 ft.dwHighDateTime = 0;
75 ft.dwLowDateTime = 0;
76 if (FileTimeToSystemTime(&ft, &st))
77 printf("nt time start: %d-%02d-%02d %02d:%02d:%02d.%03d (week day %d)\n",
78 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);
79 else
80 printf("FileTimeToSystemTime failed, lasterr=%d\n", GetLastError());
81#endif
82 return 0;
83}
84
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