From f215e02bf85f68d3a6106c2a1f4f7f063f819064 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:17:27 +0200 Subject: Adding upstream version 7.0.14-dfsg. Signed-off-by: Daniel Baumann --- src/VBox/Runtime/nt/RTSemEventGetResolution-nt.cpp | 95 ++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 src/VBox/Runtime/nt/RTSemEventGetResolution-nt.cpp (limited to 'src/VBox/Runtime/nt/RTSemEventGetResolution-nt.cpp') diff --git a/src/VBox/Runtime/nt/RTSemEventGetResolution-nt.cpp b/src/VBox/Runtime/nt/RTSemEventGetResolution-nt.cpp new file mode 100644 index 00000000..b7fe22aa --- /dev/null +++ b/src/VBox/Runtime/nt/RTSemEventGetResolution-nt.cpp @@ -0,0 +1,95 @@ +/* $Id: RTSemEventGetResolution-nt.cpp $ */ +/** @file + * IPRT - Single Release Event Semaphores, RTSemEventGetResolution. + */ + +/* + * 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 . + * + * 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 RTSEMEVENT_WITHOUT_REMAPPING +#ifdef IN_RING0 +# include "../r0drv/nt/the-nt-kernel.h" +#else +# include +#endif +#include + +#include +#include +#ifdef IN_RING3 +# include +#endif + + +RTDECL(uint32_t) RTSemEventGetResolution(void) +{ + /* + * We need to figure the KeWaitForSingleObject / NtWaitForSingleObject timeout + * resolution, i.e. if we wish to wait for 1000ns how long are we likely to + * actually wait before woken up. + * + * In older versions of NT, these timeout were implemented using KTIMERs and + * have the same resolution as what them. This should be found using + * ExSetTimerResolution or NtQueryTimerResolution. + * + * Probably since windows 8.1 the value returned by NtQueryTimerResolution (and + * set NtSetTimerResolution) have been virtualized and no longer reflects the + * timer wheel resolution, at least from what I can tell. ExSetTimerResolution + * still works as before, but it accesses variable that I cannot find out how + * to access from user land. So, kernel will get (and be able to set) the right + * granularity, while in user land we'll be forced to reporting the max value. + * + * (The reason why I suspect it's since 8.1 is because the high resolution + * ExSetTimer APIs were introduced back then.) + */ +#ifdef IN_RING0 + return RTTimerGetSystemGranularity(); +#else + ULONG cNtTicksMin = 0; + ULONG cNtTicksMax = 0; + ULONG cNtTicksCur = 0; + NTSTATUS rcNt = NtQueryTimerResolution(&cNtTicksMin, &cNtTicksMax, &cNtTicksCur); + if (NT_SUCCESS(rcNt)) + { + Assert(cNtTicksMin >= cNtTicksMax); + if (RTSystemGetNtVersion() >= RTSYSTEM_MAKE_NT_VERSION(6,3,9600)) /** @todo check when the switch happened, might be much later... */ + return cNtTicksMin * 100; + return cNtTicksCur * 100; + } + AssertFailed(); + return 16 * RT_NS_1MS; /* the default on 64-bit windows 10 */ +#endif +} + -- cgit v1.2.3