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/* $Id: tstTimer.cpp $ */
/** @file
* IPRT Testcase - 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/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++;
if (iTick != gcTicks)
RTPrintf("tstTimer: FAILURE - iTick=%llu expected %u\n", 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);
rc = RTTimerCreateEx(&pTimer, aTests[i].uMicroInterval * (uint64_t)1000, 0, TimerCallback, NULL);
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();
rc = RTTimerStart(pTimer, 0);
if (RT_FAILURE(rc))
{
RTPrintf("tstTimer: FAILURE - RTTimerStart(,0) -> %Rrc\n", rc);
cErrors++;
}
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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