diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/nt/semfastmutex-r0drv-nt.cpp')
-rw-r--r-- | src/VBox/Runtime/r0drv/nt/semfastmutex-r0drv-nt.cpp | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/nt/semfastmutex-r0drv-nt.cpp b/src/VBox/Runtime/r0drv/nt/semfastmutex-r0drv-nt.cpp new file mode 100644 index 00000000..0758f1e1 --- /dev/null +++ b/src/VBox/Runtime/r0drv/nt/semfastmutex-r0drv-nt.cpp @@ -0,0 +1,148 @@ +/* $Id: semfastmutex-r0drv-nt.cpp $ */ +/** @file + * IPRT - Fast Mutex Semaphores, Ring-0 Driver, NT. + */ + +/* + * 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 * +*********************************************************************************************************************************/ +#include "the-nt-kernel.h" +#include <iprt/semaphore.h> +#include <iprt/alloc.h> +#include <iprt/assert.h> +#include <iprt/asm.h> +#include <iprt/errcore.h> + +#include "internal/magics.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * Wrapper for the linux semaphore structure. + */ +typedef struct RTSEMFASTMUTEXINTERNAL +{ + /** Magic value (RTSEMFASTMUTEX_MAGIC). */ + uint32_t u32Magic; + /** the NT fast mutex. */ + FAST_MUTEX Mutex; +} RTSEMFASTMUTEXINTERNAL, *PRTSEMFASTMUTEXINTERNAL; + + + +RTDECL(int) RTSemFastMutexCreate(PRTSEMFASTMUTEX phFastMtx) +{ + /* + * Allocate. + */ + PRTSEMFASTMUTEXINTERNAL pThis; + Assert(sizeof(*pThis) > sizeof(void *)); + pThis = (PRTSEMFASTMUTEXINTERNAL)RTMemAlloc(sizeof(*pThis)); + if (!pThis) + return VERR_NO_MEMORY; + + /* + * Initialize. + */ + pThis->u32Magic = RTSEMFASTMUTEX_MAGIC; + ExInitializeFastMutex(&pThis->Mutex); + + *phFastMtx = pThis; + return VINF_SUCCESS; +} + + +RTDECL(int) RTSemFastMutexDestroy(RTSEMFASTMUTEX hFastMtx) +{ + /* + * Validate. + */ + PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx; + if (pThis == NIL_RTSEMFASTMUTEX) + return VINF_SUCCESS; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE); + + ASMAtomicWriteU32(&pThis->u32Magic, RTSEMFASTMUTEX_MAGIC_DEAD); + Assert(pThis->Mutex.Count == 1); + RTMemFree(pThis); + return VINF_SUCCESS; +} + + +RTDECL(int) RTSemFastMutexRequest(RTSEMFASTMUTEX hFastMtx) +{ + /* + * Validate. + */ + PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE); + +#if 1 + /* + * ExAcquireFastMutex will set the IRQL to APC regardless of our current + * level. Lowering the IRQL may screw things up, so do not allow this. + */ +# if 0 /** @todo enable this when the logger has been fixed. */ + AssertMsg(KeGetCurrentIrql() <= APC_LEVEL, ("%d\n", KeGetCurrentIrql()), VERR_INVALID_STATE); +# else /* the gentler approach. */ + KIRQL Irql = KeGetCurrentIrql(); + if (Irql > APC_LEVEL) + return VERR_INVALID_STATE; +# endif +#endif + + ExAcquireFastMutex(&pThis->Mutex); + return VINF_SUCCESS; +} + + +RTDECL(int) RTSemFastMutexRelease(RTSEMFASTMUTEX hFastMtx) +{ + /* + * Validate. + */ + PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE); + + ExReleaseFastMutex(&pThis->Mutex); + return VINF_SUCCESS; +} + |