1 files changed, 95 insertions, 0 deletions
diff --git a/src/VBox/Runtime/testcase/ntGetTimerResolution.cpp b/src/VBox/Runtime/testcase/ntGetTimerResolution.cpp
new file mode 100644
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+++ b/src/VBox/Runtime/testcase/ntGetTimerResolution.cpp
@@ -0,0 +1,95 @@
+/* $Id: ntGetTimerResolution.cpp $ */
+/** @file
+ * IPRT - Win32 (NT) testcase for getting the timer resolution.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   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;
+}
+