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diff --git a/src/VBox/Runtime/testcase/tstRTThreadExecutionTime.cpp b/src/VBox/Runtime/testcase/tstRTThreadExecutionTime.cpp
new file mode 100644
index 00000000..6ea1ff03
--- /dev/null
+++ b/src/VBox/Runtime/testcase/tstRTThreadExecutionTime.cpp
@@ -0,0 +1,93 @@
+/* $Id: tstRTThreadExecutionTime.cpp $ */
+/** @file
+ * IPRT Testcase - RTThreadGetExecution.
+ */
+
+/*
+ * Copyright (C) 2010-2020 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.h>
+#include <iprt/test.h>
+#include <iprt/string.h>
+#include <iprt/stream.h>
+#include <iprt/time.h>
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+static RTTEST g_hTest;
+static volatile uint64_t g_kernel, g_user;
+
+
+static DECLCALLBACK(int) testThread(RTTHREAD hSelf, void *pvUser)
+{
+    RT_NOREF_PV(hSelf); RT_NOREF_PV(pvUser);
+
+    uint64_t u64Now = RTTimeMilliTS();
+    uint64_t kernel, kernelStart, user, userStart;
+    RTThreadGetExecutionTimeMilli(&kernelStart, &userStart);
+    while (RTTimeMilliTS() < u64Now + 1000)
+        ;
+    RTThreadGetExecutionTimeMilli(&kernel, &user);
+    RTPrintf("kernel = %4lldms, user = %4lldms\n", kernel - kernelStart, user - userStart);
+    ASMAtomicAddU64(&g_kernel, kernel);
+    ASMAtomicAddU64(&g_user, user);
+
+    return VINF_SUCCESS;
+}
+
+
+static void test1(void)
+{
+    RTTestSub(g_hTest, "Interrupt RTThreadSleep");
+    RTTHREAD hThread[16];
+    RTMSINTERVAL msWait = 1000;
+    for (unsigned i = 0; i < RT_ELEMENTS(hThread); i++)
+    {
+        RTTESTI_CHECK_RC_RETV(RTThreadCreate(&hThread[i], testThread, NULL, 0, RTTHREADTYPE_DEFAULT,
+                              RTTHREADFLAGS_WAITABLE, "test"), VINF_SUCCESS);
+    }
+    RTThreadSleep(500);
+    RTPrintf("Waiting for %dms ...\n", msWait);
+    RTThreadSleep(msWait);
+    for (unsigned i = 0; i < RT_ELEMENTS(hThread); i++)
+        RTTESTI_CHECK_RC(RTThreadWait(hThread[i], RT_INDEFINITE_WAIT, NULL), VINF_SUCCESS);
+
+    RTPrintf("sum kernel = %lldms, sum user = %lldms\n", g_kernel, g_user);
+}
+
+
+int main()
+{
+    RTEXITCODE rcExit = RTTestInitAndCreate("tstRTThreadExecutionTime", &g_hTest);
+    if (rcExit != RTEXITCODE_SUCCESS)
+        return rcExit;
+    test1();
+
+    return RTTestSummaryAndDestroy(g_hTest);
+}