1 | /* $Id: ntGetTimerResolution.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
|
---|
2 | /** @file
|
---|
3 | * IPRT - Win32 (NT) testcase for getting the timer resolution.
|
---|
4 | */
|
---|
5 |
|
---|
6 | /*
|
---|
7 | * Copyright (C) 2006-2022 Oracle and/or its affiliates.
|
---|
8 | *
|
---|
9 | * This file is part of VirtualBox base platform packages, as
|
---|
10 | * available from https://www.virtualbox.org.
|
---|
11 | *
|
---|
12 | * This program is free software; you can redistribute it and/or
|
---|
13 | * modify it under the terms of the GNU General Public License
|
---|
14 | * as published by the Free Software Foundation, in version 3 of the
|
---|
15 | * License.
|
---|
16 | *
|
---|
17 | * This program is distributed in the hope that it will be useful, but
|
---|
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
---|
20 | * General Public License for more details.
|
---|
21 | *
|
---|
22 | * You should have received a copy of the GNU General Public License
|
---|
23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
|
---|
24 | *
|
---|
25 | * The contents of this file may alternatively be used under the terms
|
---|
26 | * of the Common Development and Distribution License Version 1.0
|
---|
27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
|
---|
28 | * in the VirtualBox distribution, in which case the provisions of the
|
---|
29 | * CDDL are applicable instead of those of the GPL.
|
---|
30 | *
|
---|
31 | * You may elect to license modified versions of this file under the
|
---|
32 | * terms and conditions of either the GPL or the CDDL or both.
|
---|
33 | *
|
---|
34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
|
---|
35 | */
|
---|
36 |
|
---|
37 |
|
---|
38 | /*********************************************************************************************************************************
|
---|
39 | * Header Files *
|
---|
40 | *********************************************************************************************************************************/
|
---|
41 | #define _WIN32_WINNT 0x0500
|
---|
42 | #include <iprt/win/windows.h>
|
---|
43 | #include <iprt/types.h>
|
---|
44 | #include <stdio.h>
|
---|
45 |
|
---|
46 | extern "C" {
|
---|
47 | /* from sysinternals. */
|
---|
48 | NTSYSAPI LONG NTAPI NtQueryTimerResolution(OUT PULONG MaximumResolution, OUT PULONG MinimumResolution, OUT PULONG CurrentResolution);
|
---|
49 | }
|
---|
50 |
|
---|
51 |
|
---|
52 | int main()
|
---|
53 | {
|
---|
54 | ULONG Min = UINT32_MAX;
|
---|
55 | ULONG Max = UINT32_MAX;
|
---|
56 | ULONG Cur = UINT32_MAX;
|
---|
57 | NtQueryTimerResolution(&Max, &Min, &Cur);
|
---|
58 | printf("NtQueryTimerResolution -> Max=%08luns Min=%08luns Cur=%08luns\n", Min * 100, Max * 100, Cur * 100);
|
---|
59 |
|
---|
60 | #if 0
|
---|
61 | /* figure out the 100ns relative to the 1970 epoc. */
|
---|
62 | SYSTEMTIME st;
|
---|
63 | st.wYear = 1970;
|
---|
64 | st.wMonth = 1;
|
---|
65 | st.wDayOfWeek = 4; /* Thor's day. */
|
---|
66 | st.wDay = 1;
|
---|
67 | st.wHour = 0;
|
---|
68 | st.wMinute = 0;
|
---|
69 | st.wSecond = 0;
|
---|
70 | st.wMilliseconds = 0;
|
---|
71 |
|
---|
72 | FILETIME ft;
|
---|
73 | if (SystemTimeToFileTime(&st, &ft))
|
---|
74 | {
|
---|
75 | printf("epoc is %I64u (0x%08x%08x)\n", ft, ft.dwHighDateTime, ft.dwLowDateTime);
|
---|
76 | if (FileTimeToSystemTime(&ft, &st))
|
---|
77 | printf("unix epoc: %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 | }
|
---|
82 | else
|
---|
83 | printf("SystemTimeToFileTime failed, lasterr=%d\n", GetLastError());
|
---|
84 |
|
---|
85 | ft.dwHighDateTime = 0;
|
---|
86 | ft.dwLowDateTime = 0;
|
---|
87 | if (FileTimeToSystemTime(&ft, &st))
|
---|
88 | printf("nt time start: %d-%02d-%02d %02d:%02d:%02d.%03d (week day %d)\n",
|
---|
89 | st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);
|
---|
90 | else
|
---|
91 | printf("FileTimeToSystemTime failed, lasterr=%d\n", GetLastError());
|
---|
92 | #endif
|
---|
93 | return 0;
|
---|
94 | }
|
---|
95 |
|
---|