| 1 | /* $Id: tstRTTime.cpp 98637 2023-02-20 08:58:45Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT Testcase - Simple RTTime tests (requires GIP).
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <iprt/time.h>
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| 42 |
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| 43 | #include <iprt/errcore.h>
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| 44 | #include <iprt/initterm.h>
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| 45 | #include <iprt/message.h>
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| 46 | #include <iprt/test.h>
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| 47 | #include <iprt/thread.h>
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| 48 |
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| 49 | int main()
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| 50 | {
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| 51 | /*
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| 52 | * Init.
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| 53 | */
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| 54 | RTTEST hTest;
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| 55 | RTEXITCODE rcExit = RTTestInitExAndCreate(0, NULL, RTR3INIT_FLAGS_SUPLIB, "tstRTTime", &hTest);
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| 56 | if (rcExit != RTEXITCODE_SUCCESS)
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| 57 | return rcExit;
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| 58 | RTTestBanner(hTest);
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| 59 |
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| 60 | /*
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| 61 | * RTNanoTimeTS() shall never return something which
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| 62 | * is less or equal to the return of the previous call.
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| 63 | */
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| 64 |
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| 65 | /* Take down the start time of both sources, try get them w/o being rescheduled. */
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| 66 | RTTimeSystemNanoTS(); RTTimeNanoTS(); RTThreadYield();
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| 67 | uint64_t u64RTStartTS = RTTimeNanoTS();
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| 68 | uint64_t u64OSStartTS = RTTimeSystemNanoTS();
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| 69 | uint64_t const cNsMaxTolerance = 256 * RT_NS_1US;
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| 70 | for (unsigned cTries = 0; cTries < 32 && RTTimeNanoTS() - u64RTStartTS > cNsMaxTolerance; cTries++)
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| 71 | {
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| 72 | RTThreadYield();
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| 73 | u64RTStartTS = RTTimeNanoTS();
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| 74 | u64OSStartTS = RTTimeSystemNanoTS();
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| 75 | }
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| 76 |
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| 77 | /* Test loop. */
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| 78 | uint32_t i;
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| 79 | uint64_t u64Prev = RTTimeNanoTS();
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| 80 | for (i = 0; i < 100*_1M; i++)
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| 81 | {
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| 82 | uint64_t u64 = RTTimeNanoTS();
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| 83 | if (u64 <= u64Prev)
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| 84 | {
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| 85 | /** @todo wrapping detection. */
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| 86 | RTTestFailed(hTest, "i=%#010x u64=%#llx u64Prev=%#llx (1)\n", i, u64, u64Prev);
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| 87 | if (RTTestErrorCount(hTest) >= 256)
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| 88 | break;
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| 89 | RTThreadYield();
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| 90 | u64 = RTTimeNanoTS();
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| 91 | }
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| 92 | else if (u64 - u64Prev > 1000000000 /* 1sec */)
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| 93 | {
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| 94 | RTTestFailed(hTest, "i=%#010x u64=%#llx u64Prev=%#llx delta=%lld\n", i, u64, u64Prev, u64 - u64Prev);
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| 95 | if (RTTestErrorCount(hTest) >= 256)
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| 96 | break;
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| 97 | RTThreadYield();
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| 98 | u64 = RTTimeNanoTS();
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| 99 | }
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| 100 | if (!(i & (_1M*2 - 1)))
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| 101 | {
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| 102 | RTTestPrintf(hTest, RTTESTLVL_INFO, "i=%#010x u64=%#llx u64Prev=%#llx delta=%lld\n", i, u64, u64Prev, u64 - u64Prev);
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| 103 | RTThreadYield();
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| 104 | u64 = RTTimeNanoTS();
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| 105 | }
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| 106 | u64Prev = u64;
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| 107 | }
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| 108 |
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| 109 | /* Take down the stop time of both sources, again try get them w/o being rescheduled. */
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| 110 | RTTimeSystemNanoTS(); RTTimeNanoTS(); RTThreadYield();
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| 111 | uint64_t u64RTElapsedTS = RTTimeNanoTS();
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| 112 | uint64_t u64OSElapsedTS = RTTimeSystemNanoTS();
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| 113 | for (unsigned cTries = 0; cTries < 32 && RTTimeNanoTS() - u64RTElapsedTS > cNsMaxTolerance; cTries++)
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| 114 | {
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| 115 | RTThreadYield();
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| 116 | u64RTElapsedTS = RTTimeNanoTS();
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| 117 | u64OSElapsedTS = RTTimeSystemNanoTS();
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| 118 | }
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| 119 | u64RTElapsedTS -= u64RTStartTS;
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| 120 | u64OSElapsedTS -= u64OSStartTS;
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| 121 |
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| 122 | /* Check the runtime difference between the two sources. */
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| 123 | int64_t i64Diff = u64OSElapsedTS >= u64RTElapsedTS ? u64OSElapsedTS - u64RTElapsedTS : u64RTElapsedTS - u64OSElapsedTS;
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| 124 | if (i64Diff > (int64_t)(RT_MAX(u64OSElapsedTS / 1000, cNsMaxTolerance)))
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| 125 | RTTestFailed(hTest, "total time differs too much! u64OSElapsedTS=%#llx u64RTElapsedTS=%#llx delta=%lld\n",
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| 126 | u64OSElapsedTS, u64RTElapsedTS, u64OSElapsedTS - u64RTElapsedTS);
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| 127 | else
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| 128 | {
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| 129 | if (u64OSElapsedTS >= u64RTElapsedTS)
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| 130 | RTTestValue(hTest, "Total time delta", u64OSElapsedTS - u64RTElapsedTS, RTTESTUNIT_NS);
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| 131 | else
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| 132 | RTTestValue(hTest, "Total time delta", u64RTElapsedTS - u64OSElapsedTS, RTTESTUNIT_NS);
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| 133 | RTTestPrintf(hTest, RTTESTLVL_INFO, "total time difference: u64OSElapsedTS=%#llx u64RTElapsedTS=%#llx delta=%lld\n",
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| 134 | u64OSElapsedTS, u64RTElapsedTS, u64OSElapsedTS - u64RTElapsedTS);
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| 135 | }
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| 136 |
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| 137 | /* Report debug details: */
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| 138 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) /** @todo This isn't really x86 or AMD64 specific... */
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| 139 | RTTestValue(hTest, "RTTimeDbgSteps", RTTimeDbgSteps(), RTTESTUNIT_OCCURRENCES);
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| 140 | RTTestValue(hTest, "RTTimeDbgSteps pp", ((uint64_t)RTTimeDbgSteps() * 1000) / i, RTTESTUNIT_PP1K);
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| 141 | RTTestValue(hTest, "RTTimeDbgExpired", RTTimeDbgExpired(), RTTESTUNIT_OCCURRENCES);
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| 142 | RTTestValue(hTest, "RTTimeDbgExpired pp", ((uint64_t)RTTimeDbgExpired() * 1000) / i, RTTESTUNIT_PP1K);
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| 143 | RTTestValue(hTest, "RTTimeDbgBad", RTTimeDbgBad(), RTTESTUNIT_OCCURRENCES);
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| 144 | RTTestValue(hTest, "RTTimeDbgBad pp", ((uint64_t)RTTimeDbgBad() * 1000) / i, RTTESTUNIT_PP1K);
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| 145 | RTTestValue(hTest, "RTTimeDbgRaces", RTTimeDbgRaces(), RTTESTUNIT_OCCURRENCES);
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| 146 | RTTestValue(hTest, "RTTimeDbgRaces pp", ((uint64_t)RTTimeDbgRaces() * 1000) / i, RTTESTUNIT_PP1K);
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| 147 | #endif
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| 148 |
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| 149 | return RTTestSummaryAndDestroy(hTest);
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| 150 | }
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