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diff --git a/src/VBox/Runtime/testcase/tstRTR0ThreadPreemption.h b/src/VBox/Runtime/testcase/tstRTR0ThreadPreemption.h
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+++ b/src/VBox/Runtime/testcase/tstRTR0ThreadPreemption.h
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+/* $Id: tstRTR0ThreadPreemption.h $ */
+/** @file
+ * IPRT R0 Testcase - Thread Preemption, common header.
+ */
+
+/*
+ * Copyright (C) 2009-2020 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.
+ */
+
+#ifndef IPRT_INCLUDED_SRC_testcase_tstRTR0ThreadPreemption_h
+#define IPRT_INCLUDED_SRC_testcase_tstRTR0ThreadPreemption_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#ifdef IN_RING0
+RT_C_DECLS_BEGIN
+DECLEXPORT(int) TSTRTR0ThreadPreemptionSrvReqHandler(PSUPDRVSESSION pSession, uint32_t uOperation,
+                                                     uint64_t u64Arg, PSUPR0SERVICEREQHDR pReqHdr);
+RT_C_DECLS_END
+#endif
+
+typedef enum TSTRTR0THREADPREEMPTION
+{
+    TSTRTR0THREADPREEMPTION_SANITY_OK = 1,
+    TSTRTR0THREADPREEMPTION_SANITY_FAILURE,
+    TSTRTR0THREADPREEMPTION_BASIC,
+    TSTRTR0THREADPREEMPTION_IS_TRUSTY,
+    TSTRTR0THREADPREEMPTION_IS_PENDING,
+    TSTRTR0THREADPREEMPTION_NESTED,
+    TSTRTR0THREADPREEMPTION_CTXHOOKS
+} TSTRTR0THREADPREEMPTION;
+
+#endif /* !IPRT_INCLUDED_SRC_testcase_tstRTR0ThreadPreemption_h */
+