1 | /* $Id: tstRTTime.cpp 106061 2024-09-16 14:03:52Z 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) 2006-2024 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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