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diff --git a/src/VBox/Runtime/include/internal/lockvalidator.h b/src/VBox/Runtime/include/internal/lockvalidator.h
new file mode 100644
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+++ b/src/VBox/Runtime/include/internal/lockvalidator.h
@@ -0,0 +1,119 @@
+/* $Id: lockvalidator.h $ */
+/** @file
+ * IPRT - Internal RTLockValidator header.
+ */
+
+/*
+ * Copyright (C) 2006-2019 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.
+ */
+
+#ifndef IPRT_INCLUDED_INTERNAL_lockvalidator_h
+#define IPRT_INCLUDED_INTERNAL_lockvalidator_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/types.h>
+#include <iprt/lockvalidator.h>
+
+RT_C_DECLS_BEGIN
+
+
+/**
+ * Record used only on the lock stack for recording the stack and source
+ * position of a recursive lock acquisition.
+ */
+typedef struct RTLOCKVALRECNEST
+{
+    RTLOCKVALRECCORE                Core;
+    /** The recursion level at this point in the stack. */
+    uint32_t                        cRecursion;
+    /** Pointer to the next record on the stack. */
+    PRTLOCKVALRECUNION volatile     pDown;
+    /** Pointer to the first recursion. */
+    PRTLOCKVALRECUNION volatile     pRec;
+    /** Pointer to the next free record when in the
+     *  RTLOCKVALPERTHREAD::pFreeNestRecs list. */
+    struct RTLOCKVALRECNEST        *pNextFree;
+    /** The source position. */
+    RTLOCKVALSRCPOS                 SrcPos;
+} RTLOCKVALRECNEST;
+/** Pointer to a recursion record. */
+typedef RTLOCKVALRECNEST *PRTLOCKVALRECNEST;
+
+
+/**
+ * Record union for simplifying internal processing.
+ */
+typedef union RTLOCKVALRECUNION
+{
+    RTLOCKVALRECCORE                Core;
+    RTLOCKVALRECEXCL                Excl;
+    RTLOCKVALRECSHRD                Shared;
+    RTLOCKVALRECSHRDOWN             ShrdOwner;
+    RTLOCKVALRECNEST                Nest;
+} RTLOCKVALRECUNION;
+
+
+/**
+ * Per thread data for the lock validator.
+ *
+ * This is part of the RTTHREADINT structure.
+ */
+typedef struct RTLOCKVALPERTHREAD
+{
+    /** Where we are blocking. */
+    RTLOCKVALSRCPOS                 SrcPos;
+    /** Top of the lock stack. */
+    PRTLOCKVALRECUNION volatile     pStackTop;
+    /** List of free recursion (nesting) record. */
+    PRTLOCKVALRECNEST               pFreeNestRecs;
+    /** What we're blocking on.
+     * The lock validator sets this, RTThreadUnblock clears it. */
+    PRTLOCKVALRECUNION volatile     pRec;
+    /** The state in which pRec that goes with pRec.
+     * RTThreadUnblocking uses this to figure out when to clear pRec. */
+    RTTHREADSTATE volatile          enmRecState;
+    /** The thread is running inside the lock validator. */
+    bool volatile                   fInValidator;
+    /** Reserved for alignment purposes. */
+    bool                            afReserved[3];
+    /** Number of registered write locks, mutexes and critsects that this thread owns. */
+    int32_t volatile                cWriteLocks;
+    /** Number of registered read locks that this thread owns, nesting included. */
+    int32_t volatile                cReadLocks;
+    /** Bitmap indicating which entires are free (set) and allocated (clear). */
+    uint32_t volatile               bmFreeShrdOwners;
+    /** Reserved for alignment purposes. */
+    uint32_t                        u32Reserved;
+    /** Statically allocated shared owner records */
+    RTLOCKVALRECSHRDOWN             aShrdOwners[32];
+} RTLOCKVALPERTHREAD;
+
+
+DECLHIDDEN(void)    rtLockValidatorInitPerThread(RTLOCKVALPERTHREAD *pPerThread);
+DECLHIDDEN(void)    rtLockValidatorDeletePerThread(RTLOCKVALPERTHREAD *pPerThread);
+DECLHIDDEN(void)    rtLockValidatorSerializeDestructEnter(void);
+DECLHIDDEN(void)    rtLockValidatorSerializeDestructLeave(void);
+
+RT_C_DECLS_END
+
+#endif /* !IPRT_INCLUDED_INTERNAL_lockvalidator_h */
+