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-rw-r--r--src/VBox/Runtime/testcase/tstTimer.cpp256
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diff --git a/src/VBox/Runtime/testcase/tstTimer.cpp b/src/VBox/Runtime/testcase/tstTimer.cpp
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+++ b/src/VBox/Runtime/testcase/tstTimer.cpp
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+/* $Id: tstTimer.cpp $ */
+/** @file
+ * IPRT Testcase - Timers.
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include <iprt/timer.h>
+#include <iprt/time.h>
+#include <iprt/thread.h>
+#include <iprt/initterm.h>
+#include <iprt/message.h>
+#include <iprt/stream.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+
+/*********************************************************************************************************************************
+* Global Variables *
+*********************************************************************************************************************************/
+static volatile unsigned gcTicks;
+static volatile uint64_t gu64Min;
+static volatile uint64_t gu64Max;
+static volatile uint64_t gu64Prev;
+static volatile uint64_t gu64Norm;
+
+static uint32_t cFrequency[200];
+
+static DECLCALLBACK(void) TimerCallback(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
+{
+ RT_NOREF_PV(pTimer); 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;
+ int i = (int)( RT_ELEMENTS(cFrequency)
+ - (u64Delta * (RT_ELEMENTS(cFrequency) / 2) / gu64Norm));
+ if (i >= 0 && i < (int)RT_ELEMENTS(cFrequency))
+ cFrequency[i]++;
+ }
+ gu64Prev = u64Now;
+}
+
+
+int main()
+{
+ /*
+ * Init runtime
+ */
+ unsigned cErrors = 0;
+ int rc = RTR3InitExeNoArguments(0);
+ if (RT_FAILURE(rc))
+ return RTMsgInitFailure(rc);
+
+ /*
+ * Check that the clock is reliable.
+ */
+ RTPrintf("tstTimer: TESTING - RTTimeNanoTS() for 2sec\n");
+ 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)
+ {
+ RTPrintf("tstTimer: FAILURE - RTTimeNanoTS() is unreliable. uTS=%RU64 uTSLast=%RU64\n", uTS, uTSLast);
+ cErrors++;
+ }
+ if (++cIterations > (2*1000*1000*1000))
+ {
+ RTPrintf("tstTimer: FAILURE - RTTimeNanoTS() is unreliable. cIterations=%RU64 uTS=%RU64 uTSBegin=%RU64\n", cIterations, uTS, uTSBegin);
+ return 1;
+ }
+ uTSLast = uTS;
+ uTSDiff = uTSLast - uTSBegin;
+ } while (uTSDiff < (2*1000*1000*1000));
+ uTSMillies = RTTimeMilliTS() - uTSMillies;
+ if (uTSMillies >= 2500 || uTSMillies <= 1500)
+ {
+ RTPrintf("tstTimer: FAILURE - uTSMillies=%RI64 uTSBegin=%RU64 uTSLast=%RU64 uTSDiff=%RU64\n",
+ uTSMillies, uTSBegin, uTSLast, uTSDiff);
+ cErrors++;
+ }
+ if (!cErrors)
+ RTPrintf("tstTimer: OK - RTTimeNanoTS()\n");
+
+ /*
+ * Tests.
+ */
+ static struct
+ {
+ unsigned uMicroInterval;
+ unsigned uMilliesWait;
+ unsigned cLower;
+ unsigned cUpper;
+ } aTests[] =
+ {
+ { 32000, 2000, 0, 0 },
+ { 20000, 2000, 0, 0 },
+ { 10000, 2000, 0, 0 },
+ { 8000, 2000, 0, 0 },
+ { 2000, 2000, 0, 0 },
+ { 1000, 2000, 0, 0 },
+ { 500, 5000, 0, 0 },
+ { 200, 5000, 0, 0 },
+ { 100, 5000, 0, 0 }
+ };
+
+ unsigned i = 0;
+ for (i = 0; i < RT_ELEMENTS(aTests); i++)
+ {
+ aTests[i].cLower = (aTests[i].uMilliesWait*1000 - aTests[i].uMilliesWait*100) / aTests[i].uMicroInterval;
+ aTests[i].cUpper = (aTests[i].uMilliesWait*1000 + aTests[i].uMilliesWait*100) / aTests[i].uMicroInterval;
+ gu64Norm = aTests[i].uMicroInterval*1000;
+
+ RTPrintf("\n"
+ "tstTimer: TESTING - %d us interval, %d ms wait, expects %d-%d ticks.\n",
+ aTests[i].uMicroInterval, aTests[i].uMilliesWait, aTests[i].cLower, aTests[i].cUpper);
+
+ /*
+ * Start timer which ticks every 10ms.
+ */
+ gcTicks = 0;
+ PRTTIMER pTimer;
+ gu64Max = 0;
+ gu64Min = UINT64_MAX;
+ gu64Prev = 0;
+ RT_ZERO(cFrequency);
+#ifdef RT_OS_WINDOWS
+ if (aTests[i].uMicroInterval < 1000)
+ continue;
+ rc = RTTimerCreate(&pTimer, aTests[i].uMicroInterval / 1000, TimerCallback, NULL);
+#else
+ rc = RTTimerCreateEx(&pTimer, aTests[i].uMicroInterval * (uint64_t)1000, 0, TimerCallback, NULL);
+#endif
+ if (RT_FAILURE(rc))
+ {
+ RTPrintf("tstTimer: FAILURE - RTTimerCreateEx(,%u*1M,,,) -> %Rrc\n", aTests[i].uMicroInterval, rc);
+ cErrors++;
+ continue;
+ }
+
+ /*
+ * Start the timer and active waiting for the requested test period.
+ */
+ uTSBegin = RTTimeNanoTS();
+#ifndef RT_OS_WINDOWS
+ rc = RTTimerStart(pTimer, 0);
+ if (RT_FAILURE(rc))
+ {
+ RTPrintf("tstTimer: FAILURE - RTTimerStart(,0) -> %Rrc\n", rc);
+ cErrors++;
+ }
+#endif
+
+ while (RTTimeNanoTS() - uTSBegin < (uint64_t)aTests[i].uMilliesWait * 1000000)
+ /* nothing */;
+
+ /* destroy the timer */
+ uint64_t uTSEnd = RTTimeNanoTS();
+ uTSDiff = uTSEnd - uTSBegin;
+ rc = RTTimerDestroy(pTimer);
+ if (RT_FAILURE(rc))
+ {
+ RTPrintf("tstTimer: FAILURE - RTTimerDestroy() -> %d gcTicks=%d\n", rc, gcTicks);
+ cErrors++;
+ }
+
+ RTPrintf("tstTimer: uTS=%RI64 (%RU64 - %RU64)\n", uTSDiff, uTSBegin, uTSEnd);
+ unsigned cTicks = gcTicks;
+ RTThreadSleep(aTests[i].uMicroInterval/1000 * 3);
+ if (gcTicks != cTicks)
+ {
+ RTPrintf("tstTimer: FAILURE - RTTimerDestroy() didn't really stop the timer! gcTicks=%d cTicks=%d\n", gcTicks, cTicks);
+ cErrors++;
+ continue;
+ }
+
+ /*
+ * Check the number of ticks.
+ */
+ if (gcTicks < aTests[i].cLower)
+ {
+ RTPrintf("tstTimer: FAILURE - Too few ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
+ cErrors++;
+ }
+ else if (gcTicks > aTests[i].cUpper)
+ {
+ RTPrintf("tstTimer: FAILURE - Too many ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
+ cErrors++;
+ }
+ else
+ RTPrintf("tstTimer: OK - gcTicks=%d", gcTicks);
+ RTPrintf(" min=%RU64 max=%RU64\n", gu64Min, gu64Max);
+
+ for (int j = 0; j < (int)RT_ELEMENTS(cFrequency); j++)
+ {
+ uint32_t len = cFrequency[j] * 70 / gcTicks;
+ uint32_t deviation = j - RT_ELEMENTS(cFrequency) / 2;
+ uint64_t u64FreqPercent = (uint64_t)cFrequency[j] * 10000 / gcTicks;
+ uint64_t u64FreqPercentFrac = u64FreqPercent % 100;
+ u64FreqPercent = u64FreqPercent / 100;
+ RTPrintf("%+4d%c %6u %3llu.%02llu%% ",
+ deviation, deviation == 0 ? ' ' : '%', cFrequency[j],
+ u64FreqPercent, u64FreqPercentFrac);
+ for (unsigned k = 0; k < len; k++)
+ RTPrintf("*");
+ RTPrintf("\n");
+ }
+ }
+
+ /*
+ * Summary.
+ */
+ if (!cErrors)
+ RTPrintf("tstTimer: SUCCESS\n");
+ else
+ RTPrintf("tstTimer: FAILURE %d errors\n", cErrors);
+ return !!cErrors;
+}
+
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