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diff --git a/src/VBox/Runtime/testcase/tstRTR0Thread.cpp b/src/VBox/Runtime/testcase/tstRTR0Thread.cpp
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+/* $Id: tstRTR0Thread.cpp $ */
+/** @file
+ * IPRT R0 Testcase - Kernel thread.
+ */
+
+/*
+ * Copyright (C) 2015-2020 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 <iprt/thread.h>
+
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/errcore.h>
+#include <VBox/sup.h>
+#include "tstRTR0Thread.h"
+#include "tstRTR0Common.h"
+
+#define TSTRTR0THREADDATA_MAGIC 0xcececece
+
+/**
+ * State structure for tstRTR0ThreadCallback().
+ */
+typedef struct TSTRTR0THREADDATA
+{
+ /** The magic value. */
+ uint32_t uMagic;
+ /** Sample counter. */
+ uint32_t volatile cCounter;
+ /** The thread handle. */
+ RTTHREAD hThread;
+} TSTRTR0THREADDATA;
+/** Pointer to state structure for tstRTR0ThreadCallback(). */
+typedef TSTRTR0THREADDATA *PTSTRTR0THREADDATA;
+
+
+static DECLCALLBACK(int) tstRTR0ThreadCallback(RTTHREAD hThread, void *pvUser)
+{
+ PTSTRTR0THREADDATA pData = (PTSTRTR0THREADDATA)pvUser;
+ RT_NOREF1(hThread);
+ if (RT_LIKELY(pData))
+ {
+ if (pData->uMagic == TSTRTR0THREADDATA_MAGIC)
+ pData->uMagic = ~pData->uMagic;
+ if (pData->cCounter == 127)
+ pData->cCounter = 196;
+ }
+ RTThreadUserSignal(RTThreadSelf());
+ return VINF_SUCCESS;
+}
+
+
+/**
+ * Service request callback function.
+ *
+ * @returns VBox status code.
+ * @param pSession The caller's session.
+ * @param u64Arg 64-bit integer argument.
+ * @param pReqHdr The request header. Input / Output. Optional.
+ */
+DECLEXPORT(int) TSTRTR0ThreadSrvReqHandler(PSUPDRVSESSION pSession, uint32_t uOperation,
+ uint64_t u64Arg, PSUPR0SERVICEREQHDR pReqHdr)
+{
+ RTR0TESTR0_SRV_REQ_PROLOG_RET(pReqHdr);
+ RT_NOREF2(pSession, u64Arg);
+
+ /*
+ * The big switch.
+ */
+ switch (uOperation)
+ {
+ RTR0TESTR0_IMPLEMENT_SANITY_CASES();
+ RTR0TESTR0_IMPLEMENT_DEFAULT_CASE(uOperation);
+
+ case TSTRTR0THREAD_BASIC:
+ {
+ TSTRTR0THREADDATA Data;
+ RT_ZERO(Data);
+ Data.uMagic = TSTRTR0THREADDATA_MAGIC;
+ Data.cCounter = 127;
+
+ /* Create the kernel thread. */
+ RTR0TESTR0_CHECK_RC_BREAK(RTThreadCreate(&Data.hThread, tstRTR0ThreadCallback, &Data, 0 /* cbStack */,
+ RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "tstRTR0Thr"), VINF_SUCCESS);
+
+ /* Wait for thread to signal. */
+ RTR0TESTR0_CHECK_RC(RTThreadUserWait(Data.hThread, 500 /* ms */), VINF_SUCCESS);
+
+ /* Reset the semaphore. */
+ RTR0TESTR0_CHECK_RC(RTThreadUserReset(Data.hThread), VINF_SUCCESS);
+
+ /* Check if the thread has modified data as expected. */
+ RTR0TESTR0_CHECK_MSG_BREAK(Data.cCounter = 196 && Data.uMagic == ~TSTRTR0THREADDATA_MAGIC,
+ ("Thread didn't modify data as expected.\n"));
+ break;
+ }
+ }
+
+ RTR0TESTR0_SRV_REQ_EPILOG(pReqHdr);
+ /* The error indicator is the '!' in the message buffer. */
+ return VINF_SUCCESS;
+}
+