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Diffstat (limited to 'src/VBox/Runtime/testcase/tstTimer.cpp')
| -rw-r--r-- | src/VBox/Runtime/testcase/tstTimer.cpp | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/src/VBox/Runtime/testcase/tstTimer.cpp b/src/VBox/Runtime/testcase/tstTimer.cpp new file mode 100644 index 00000000..d179fdeb --- /dev/null +++ b/src/VBox/Runtime/testcase/tstTimer.cpp @@ -0,0 +1,261 @@ +/* $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; +} + |