| 1 | /* $Id: ntGetTimerResolution.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Win32 (NT) testcase for getting the timer resolution.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2019 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #define _WIN32_WINNT 0x0500
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| 32 | #include <iprt/win/windows.h>
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| 33 | #include <iprt/types.h>
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| 34 | #include <stdio.h>
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| 35 |
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| 36 | extern "C" {
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| 37 | /* from sysinternals. */
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| 38 | NTSYSAPI LONG NTAPI NtQueryTimerResolution(OUT PULONG MaximumResolution, OUT PULONG MinimumResolution, OUT PULONG CurrentResolution);
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| 39 | }
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| 40 |
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| 41 |
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| 42 | int main()
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| 43 | {
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| 44 | ULONG Min = UINT32_MAX;
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| 45 | ULONG Max = UINT32_MAX;
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| 46 | ULONG Cur = UINT32_MAX;
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| 47 | NtQueryTimerResolution(&Max, &Min, &Cur);
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| 48 | printf("NtQueryTimerResolution -> Max=%08luns Min=%08luns Cur=%08luns\n", Min * 100, Max * 100, Cur * 100);
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| 49 |
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| 50 | #if 0
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| 51 | /* figure out the 100ns relative to the 1970 epoc. */
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| 52 | SYSTEMTIME st;
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| 53 | st.wYear = 1970;
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| 54 | st.wMonth = 1;
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| 55 | st.wDayOfWeek = 4; /* Thor's day. */
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| 56 | st.wDay = 1;
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| 57 | st.wHour = 0;
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| 58 | st.wMinute = 0;
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| 59 | st.wSecond = 0;
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| 60 | st.wMilliseconds = 0;
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| 61 |
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| 62 | FILETIME ft;
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| 63 | if (SystemTimeToFileTime(&st, &ft))
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| 64 | {
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| 65 | printf("epoc is %I64u (0x%08x%08x)\n", ft, ft.dwHighDateTime, ft.dwLowDateTime);
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| 66 | if (FileTimeToSystemTime(&ft, &st))
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| 67 | printf("unix epoc: %d-%02d-%02d %02d:%02d:%02d.%03d (week day %d)\n",
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| 68 | st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);
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| 69 | else
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| 70 | printf("FileTimeToSystemTime failed, lasterr=%d\n", GetLastError());
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| 71 | }
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| 72 | else
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| 73 | printf("SystemTimeToFileTime failed, lasterr=%d\n", GetLastError());
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| 74 |
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| 75 | ft.dwHighDateTime = 0;
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| 76 | ft.dwLowDateTime = 0;
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| 77 | if (FileTimeToSystemTime(&ft, &st))
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| 78 | printf("nt time start: %d-%02d-%02d %02d:%02d:%02d.%03d (week day %d)\n",
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| 79 | st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);
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| 80 | else
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| 81 | printf("FileTimeToSystemTime failed, lasterr=%d\n", GetLastError());
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| 82 | #endif
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| 83 | return 0;
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| 84 | }
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| 85 |
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