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diff --git a/src/VBox/Runtime/testcase/tstRTTimerLR.cpp b/src/VBox/Runtime/testcase/tstRTTimerLR.cpp
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+/* $Id: tstRTTimerLR.cpp $ */
+/** @file
+ * IPRT Testcase - Low Resolution Timers.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include <iprt/timer.h>
+
+#include <iprt/errcore.h>
+#include <iprt/message.h>
+#include <iprt/stream.h>
+#include <iprt/test.h>
+#include <iprt/thread.h>
+#include <iprt/time.h>
+
+
+/*********************************************************************************************************************************
+* Global Variables *
+*********************************************************************************************************************************/
+static volatile unsigned gcTicks;
+static volatile uint64_t gu64Min;
+static volatile uint64_t gu64Max;
+static volatile uint64_t gu64Prev;
+
+
+static DECLCALLBACK(void) TimerLRCallback(RTTIMERLR hTimerLR, void *pvUser, uint64_t iTick)
+{
+ RT_NOREF_PV(hTimerLR); RT_NOREF_PV(pvUser); RT_NOREF_PV(iTick);
+
+ gcTicks++;
+
+ const uint64_t u64Now = RTTimeNanoTS();
+ if (gu64Prev)
+ {
+ const uint64_t u64Delta = u64Now - gu64Prev;
+ if (u64Delta < gu64Min)
+ gu64Min = u64Delta;
+ if (u64Delta > gu64Max)
+ gu64Max = u64Delta;
+ }
+ gu64Prev = u64Now;
+}
+
+
+int main()
+{
+ /*
+ * Init runtime
+ */
+ RTTEST hTest;
+ RTEXITCODE rcExit = RTTestInitAndCreate("tstRTTimerLR", &hTest);
+ if (rcExit != RTEXITCODE_SUCCESS)
+ return rcExit;
+
+ /*
+ * Check that the clock is reliable.
+ */
+ RTTestSub(hTest, "RTTimeNanoTS() for 2sec");
+ uint64_t uTSMillies = RTTimeMilliTS();
+ uint64_t uTSBegin = RTTimeNanoTS();
+ uint64_t uTSLast = uTSBegin;
+ uint64_t uTSDiff;
+ uint64_t cIterations = 0;
+
+ do
+ {
+ uint64_t uTS = RTTimeNanoTS();
+ if (uTS < uTSLast)
+ RTTestFailed(hTest, "RTTimeNanoTS() is unreliable. uTS=%RU64 uTSLast=%RU64", uTS, uTSLast);
+ if (++cIterations > 2*1000*1000*1000)
+ {
+ RTTestFailed(hTest, "RTTimeNanoTS() is unreliable. cIterations=%RU64 uTS=%RU64 uTSBegin=%RU64",
+ cIterations, uTS, uTSBegin);
+ return RTTestSummaryAndDestroy(hTest);
+ }
+ uTSLast = uTS;
+ uTSDiff = uTSLast - uTSBegin;
+ } while (uTSDiff < (2*1000*1000*1000));
+ uTSMillies = RTTimeMilliTS() - uTSMillies;
+ if (uTSMillies >= 2500 || uTSMillies <= 1500)
+ RTTestFailed(hTest, "uTSMillies=%RI64 uTSBegin=%RU64 uTSLast=%RU64 uTSDiff=%RU64",
+ uTSMillies, uTSBegin, uTSLast, uTSDiff);
+
+ /*
+ * Tests.
+ */
+ static struct
+ {
+ unsigned uMilliesInterval;
+ unsigned uMilliesWait;
+ unsigned cLower;
+ unsigned cUpper;
+ } aTests[] =
+ {
+ { 1000, 2500, 3, 3 }, /* (keep in mind the immediate first tick) */
+ { 250, 2000, 6, 10 },
+ { 100, 2000, 17, 23 },
+ };
+
+ int rc;
+ unsigned i = 0;
+ for (i = 0; i < RT_ELEMENTS(aTests); i++)
+ {
+ //aTests[i].cLower = (aTests[i].uMilliesWait - aTests[i].uMilliesWait / 10) / aTests[i].uMilliesInterval;
+ //aTests[i].cUpper = (aTests[i].uMilliesWait + aTests[i].uMilliesWait / 10) / aTests[i].uMilliesInterval;
+
+ RTTestSubF(hTest, "%d ms interval, %d ms wait, expects %d-%d ticks",
+ aTests[i].uMilliesInterval, aTests[i].uMilliesWait, aTests[i].cLower, aTests[i].cUpper);
+
+ /*
+ * Start timer which ticks every 10ms.
+ */
+ gcTicks = 0;
+ RTTIMERLR hTimerLR;
+ gu64Max = 0;
+ gu64Min = UINT64_MAX;
+ gu64Prev = 0;
+ rc = RTTimerLRCreateEx(&hTimerLR, aTests[i].uMilliesInterval * (uint64_t)1000000, 0, TimerLRCallback, NULL);
+ if (RT_FAILURE(rc))
+ {
+ RTTestFailed(hTest, "RTTimerLRCreateEX(,%u*1M,,,) -> %Rrc", aTests[i].uMilliesInterval, rc);
+ continue;
+ }
+
+ /*
+ * Start the timer an actively wait for it for the period requested.
+ */
+ uTSBegin = RTTimeNanoTS();
+ rc = RTTimerLRStart(hTimerLR, 0);
+ if (RT_FAILURE(rc))
+ RTTestFailed(hTest, "RTTimerLRStart() -> %Rrc", rc);
+
+ while (RTTimeNanoTS() - uTSBegin < (uint64_t)aTests[i].uMilliesWait * 1000000)
+ RTThreadSleep(1);
+
+ /* don't stop it, destroy it because there are potential races in destroying an active timer. */
+ rc = RTTimerLRDestroy(hTimerLR);
+ if (RT_FAILURE(rc))
+ RTTestFailed(hTest, "RTTimerLRDestroy() -> %Rrc gcTicks=%d", rc, gcTicks);
+
+ uint64_t uTSEnd = RTTimeNanoTS();
+ uTSDiff = uTSEnd - uTSBegin;
+ RTTestPrintf(hTest, RTTESTLVL_ALWAYS, "uTS=%'RI64 (%'RU64 - %'RU64) gcTicks=%u min=%'RU64 max=%'RU64\n",
+ uTSDiff, uTSBegin, uTSEnd, gcTicks, gu64Min, gu64Max);
+
+ /* Check that it really stopped. */
+ unsigned cTicks = gcTicks;
+ RTThreadSleep(aTests[i].uMilliesInterval * 2);
+ if (gcTicks != cTicks)
+ {
+ RTTestFailed(hTest, "RTTimerLRDestroy() didn't really stop the timer! gcTicks=%d cTicks=%d", gcTicks, cTicks);
+ continue;
+ }
+
+ /*
+ * Check the number of ticks.
+ */
+ if (gcTicks < aTests[i].cLower)
+ RTTestFailed(hTest, "Too few ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
+ else if (gcTicks > aTests[i].cUpper)
+ RTTestFailed(hTest, "Too many ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
+ }
+
+ /*
+ * Test changing the interval dynamically
+ */
+ RTTestSub(hTest, "RTTimerLRChangeInterval");
+ do
+ {
+ RTTIMERLR hTimerLR;
+ rc = RTTimerLRCreateEx(&hTimerLR, aTests[0].uMilliesInterval * (uint64_t)1000000, 0, TimerLRCallback, NULL);
+ if (RT_FAILURE(rc))
+ {
+ RTTestFailed(hTest, "RTTimerLRCreateEX(,%u*1M,,,) -> %Rrc", aTests[0].uMilliesInterval, rc);
+ break;
+ }
+
+ for (i = 0; i < RT_ELEMENTS(aTests); i++)
+ {
+ RTTestPrintf(hTest, RTTESTLVL_ALWAYS, "%d ms interval, %d ms wait, expects %d-%d ticks.\n",
+ aTests[i].uMilliesInterval, aTests[i].uMilliesWait, aTests[i].cLower, aTests[i].cUpper);
+
+ gcTicks = 0;
+ gu64Max = 0;
+ gu64Min = UINT64_MAX;
+ gu64Prev = 0;
+
+ /*
+ * Start the timer an actively wait for it for the period requested.
+ */
+ uTSBegin = RTTimeNanoTS();
+ if (i == 0)
+ {
+ rc = RTTimerLRStart(hTimerLR, 0);
+ if (RT_FAILURE(rc))
+ RTTestFailed(hTest, "RTTimerLRStart() -> %Rrc", rc);
+ }
+ else
+ {
+ rc = RTTimerLRChangeInterval(hTimerLR, aTests[i].uMilliesInterval * RT_NS_1MS_64);
+ if (RT_FAILURE(rc))
+ RTTestFailed(hTest, "RTTimerLRChangeInterval() -> %d gcTicks=%d", rc, gcTicks);
+ }
+
+ while (RTTimeNanoTS() - uTSBegin < (uint64_t)aTests[i].uMilliesWait * RT_NS_1MS_64)
+ RTThreadSleep(1);
+
+ uint64_t uTSEnd = RTTimeNanoTS();
+ uTSDiff = uTSEnd - uTSBegin;
+ RTTestPrintf(hTest, RTTESTLVL_ALWAYS, "uTS=%'RI64 (%'RU64 - %'RU64) gcTicks=%u min=%'RU64 max=%'RU64\n",
+ uTSDiff, uTSBegin, uTSEnd, gcTicks, gu64Min, gu64Max);
+
+ /*
+ * Check the number of ticks.
+ */
+ if (gcTicks < aTests[i].cLower)
+ RTTestFailed(hTest, "Too few ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
+ else if (gcTicks > aTests[i].cUpper)
+ RTTestFailed(hTest, "Too many ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
+ }
+
+ /* don't stop it, destroy it because there are potential races in destroying an active timer. */
+ rc = RTTimerLRDestroy(hTimerLR);
+ if (RT_FAILURE(rc))
+ RTTestFailed(hTest, "RTTimerLRDestroy() -> %d gcTicks=%d", rc, gcTicks);
+ } while (0);
+
+ /*
+ * Test multiple timers running at once.
+ */
+ /** @todo multiple LR timer testcase. */
+
+ /*
+ * Summary.
+ */
+ return RTTestSummaryAndDestroy(hTest);
+}
+
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