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/* $Id: tstRTTimerLR.cpp $ */
/** @file
* IPRT Testcase - Low Resolution Timers.
*/
/*
* Copyright (C) 2006-2020 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/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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