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Diffstat (limited to 'src/VBox/Runtime/r0drv/nt/semfastmutex-r0drv-nt.cpp')
-rw-r--r--src/VBox/Runtime/r0drv/nt/semfastmutex-r0drv-nt.cpp138
1 files changed, 138 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..0780a2dd
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/nt/semfastmutex-r0drv-nt.cpp
@@ -0,0 +1,138 @@
+/* $Id: semfastmutex-r0drv-nt.cpp $ */
+/** @file
+ * IPRT - Fast Mutex Semaphores, Ring-0 Driver, NT.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE 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.
+ */
+
+
+
+/*********************************************************************************************************************************
+* 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;
+}
+