1 | /* $Id: tstTimerLR.cpp 38636 2011-09-05 13:49:45Z vboxsync $ */
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2 | /** @file
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3 | * IPRT Testcase - Low Resolution Timers.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2008 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 | /*******************************************************************************
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28 | * Header Files *
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29 | *******************************************************************************/
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30 | #include <iprt/timer.h>
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31 | #include <iprt/time.h>
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32 | #include <iprt/thread.h>
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33 | #include <iprt/initterm.h>
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34 | #include <iprt/message.h>
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35 | #include <iprt/stream.h>
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36 | #include <iprt/err.h>
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37 |
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38 |
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39 |
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40 | /*******************************************************************************
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41 | * Global Variables *
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42 | *******************************************************************************/
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43 | static volatile unsigned gcTicks;
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44 | static volatile uint64_t gu64Min;
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45 | static volatile uint64_t gu64Max;
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46 | static volatile uint64_t gu64Prev;
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47 |
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48 | static DECLCALLBACK(void) TimerLRCallback(RTTIMERLR hTimerLR, void *pvUser, uint64_t iTick)
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49 | {
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50 | gcTicks++;
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51 |
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52 | const uint64_t u64Now = RTTimeNanoTS();
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53 | if (gu64Prev)
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54 | {
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55 | const uint64_t u64Delta = u64Now - gu64Prev;
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56 | if (u64Delta < gu64Min)
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57 | gu64Min = u64Delta;
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58 | if (u64Delta > gu64Max)
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59 | gu64Max = u64Delta;
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60 | }
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61 | gu64Prev = u64Now;
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62 | }
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63 |
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64 |
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65 | int main()
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66 | {
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67 | /*
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68 | * Init runtime
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69 | */
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70 | unsigned cErrors = 0;
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71 | int rc = RTR3InitExeNoArguments(0);
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72 | if (RT_FAILURE(rc))
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73 | return RTMsgInitFailure(rc);
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74 |
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75 | /*
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76 | * Check that the clock is reliable.
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77 | */
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78 | RTPrintf("tstTimer: TESTING - RTTimeNanoTS() for 2sec\n");
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79 | uint64_t uTSMillies = RTTimeMilliTS();
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80 | uint64_t uTSBegin = RTTimeNanoTS();
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81 | uint64_t uTSLast = uTSBegin;
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82 | uint64_t uTSDiff;
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83 | uint64_t cIterations = 0;
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84 |
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85 | do
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86 | {
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87 | uint64_t uTS = RTTimeNanoTS();
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88 | if (uTS < uTSLast)
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89 | {
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90 | RTPrintf("tstTimer: FAILURE - RTTimeNanoTS() is unreliable. uTS=%RU64 uTSLast=%RU64\n", uTS, uTSLast);
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91 | cErrors++;
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92 | }
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93 | if (++cIterations > (2*1000*1000*1000))
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94 | {
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95 | RTPrintf("tstTimer: FAILURE - RTTimeNanoTS() is unreliable. cIterations=%RU64 uTS=%RU64 uTSBegin=%RU64\n", cIterations, uTS, uTSBegin);
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96 | return 1;
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97 | }
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98 | uTSLast = uTS;
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99 | uTSDiff = uTSLast - uTSBegin;
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100 | } while (uTSDiff < (2*1000*1000*1000));
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101 | uTSMillies = RTTimeMilliTS() - uTSMillies;
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102 | if (uTSMillies >= 2500 || uTSMillies <= 1500)
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103 | {
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104 | RTPrintf("tstTimer: FAILURE - uTSMillies=%RI64 uTSBegin=%RU64 uTSLast=%RU64 uTSDiff=%RU64\n",
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105 | uTSMillies, uTSBegin, uTSLast, uTSDiff);
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106 | cErrors++;
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107 | }
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108 | if (!cErrors)
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109 | RTPrintf("tstTimer: OK - RTTimeNanoTS()\n");
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110 |
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111 | /*
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112 | * Tests.
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113 | */
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114 | static struct
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115 | {
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116 | unsigned uMilliesInterval;
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117 | unsigned uMilliesWait;
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118 | unsigned cLower;
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119 | unsigned cUpper;
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120 | } aTests[] =
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121 | {
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122 | { 1000, 2500, 3, 3 }, /* (keep in mind the immediate first tick) */
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123 | { 250, 2000, 6, 10 },
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124 | { 100, 2000, 17, 23 },
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125 | };
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126 |
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127 | unsigned i = 0;
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128 | for (i = 0; i < RT_ELEMENTS(aTests); i++)
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129 | {
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130 | //aTests[i].cLower = (aTests[i].uMilliesWait - aTests[i].uMilliesWait / 10) / aTests[i].uMilliesInterval;
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131 | //aTests[i].cUpper = (aTests[i].uMilliesWait + aTests[i].uMilliesWait / 10) / aTests[i].uMilliesInterval;
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132 |
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133 | RTPrintf("\n"
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134 | "tstTimer: TESTING - %d ms interval, %d ms wait, expects %d-%d ticks.\n",
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135 | aTests[i].uMilliesInterval, aTests[i].uMilliesWait, aTests[i].cLower, aTests[i].cUpper);
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136 |
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137 | /*
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138 | * Start timer which ticks every 10ms.
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139 | */
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140 | gcTicks = 0;
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141 | RTTIMERLR hTimerLR;
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142 | gu64Max = 0;
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143 | gu64Min = UINT64_MAX;
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144 | gu64Prev = 0;
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145 | rc = RTTimerLRCreateEx(&hTimerLR, aTests[i].uMilliesInterval * (uint64_t)1000000, 0, TimerLRCallback, NULL);
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146 | if (RT_FAILURE(rc))
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147 | {
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148 | RTPrintf("RTTimerLRCreateEX(,%u*1M,,,) -> %d\n", aTests[i].uMilliesInterval, rc);
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149 | cErrors++;
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150 | continue;
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151 | }
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152 |
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153 | /*
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154 | * Start the timer an actively wait for it for the period requested.
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155 | */
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156 | uTSBegin = RTTimeNanoTS();
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157 | rc = RTTimerLRStart(hTimerLR, 0);
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158 | if (RT_FAILURE(rc))
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159 | {
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160 | RTPrintf("tstTimer: FAILURE - RTTimerLRStart() -> %Rrc\n", rc);
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161 | cErrors++;
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162 | }
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163 |
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164 | while (RTTimeNanoTS() - uTSBegin < (uint64_t)aTests[i].uMilliesWait * 1000000)
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165 | /* nothing */;
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166 |
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167 | /* don't stop it, destroy it because there are potential races in destroying an active timer. */
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168 | rc = RTTimerLRDestroy(hTimerLR);
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169 | if (RT_FAILURE(rc))
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170 | {
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171 | RTPrintf("tstTimer: FAILURE - RTTimerLRDestroy() -> %d gcTicks=%d\n", rc, gcTicks);
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172 | cErrors++;
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173 | }
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174 |
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175 | uint64_t uTSEnd = RTTimeNanoTS();
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176 | uTSDiff = uTSEnd - uTSBegin;
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177 | RTPrintf("uTS=%RI64 (%RU64 - %RU64)\n", uTSDiff, uTSBegin, uTSEnd);
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178 |
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179 | /* Check that it really stopped. */
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180 | unsigned cTicks = gcTicks;
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181 | RTThreadSleep(aTests[i].uMilliesInterval * 2);
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182 | if (gcTicks != cTicks)
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183 | {
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184 | RTPrintf("tstTimer: FAILURE - RTTimerLRDestroy() didn't really stop the timer! gcTicks=%d cTicks=%d\n", gcTicks, cTicks);
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185 | cErrors++;
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186 | continue;
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187 | }
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188 |
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189 | /*
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190 | * Check the number of ticks.
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191 | */
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192 | if (gcTicks < aTests[i].cLower)
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193 | {
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194 | RTPrintf("tstTimer: FAILURE - Too few ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
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195 | cErrors++;
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196 | }
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197 | else if (gcTicks > aTests[i].cUpper)
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198 | {
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199 | RTPrintf("tstTimer: FAILURE - Too many ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
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200 | cErrors++;
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201 | }
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202 | else
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203 | RTPrintf("tstTimer: OK - gcTicks=%d", gcTicks);
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204 | RTPrintf(" min=%RU64 max=%RU64\n", gu64Min, gu64Max);
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205 | }
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206 |
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207 | /*
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208 | * Test multiple timers running at once.
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209 | */
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210 | /** @todo multiple LR timer testcase. */
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211 |
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212 | /*
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213 | * Summary.
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214 | */
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215 | if (!cErrors)
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216 | RTPrintf("tstTimer: SUCCESS\n");
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217 | else
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218 | RTPrintf("tstTimer: FAILURE %d errors\n", cErrors);
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219 | return !!cErrors;
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220 | }
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221 |
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