VirtualBox

source: vbox/trunk/src/VBox/Runtime/testcase/tstTimer.cpp@ 53401

Last change on this file since 53401 was 48935, checked in by vboxsync, 11 years ago

Runtime: Whitespace and svn:keyword cleanups by scm.
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1/* $Id: tstTimer.cpp 48935 2013-10-07 21:19:37Z vboxsync $ */
2/** @file
3 * IPRT Testcase - Timers.
4 */
5
6/*
7 * Copyright (C) 2006-2011 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27/*******************************************************************************
28* Header Files *
29*******************************************************************************/
30#include <iprt/timer.h>
31#include <iprt/time.h>
32#include <iprt/thread.h>
33#include <iprt/initterm.h>
34#include <iprt/message.h>
35#include <iprt/stream.h>
36#include <iprt/err.h>
37#include <iprt/string.h>
38
39
40
41/*******************************************************************************
42* Global Variables *
43*******************************************************************************/
44static volatile unsigned gcTicks;
45static volatile uint64_t gu64Min;
46static volatile uint64_t gu64Max;
47static volatile uint64_t gu64Prev;
48static volatile uint64_t gu64Norm;
49
50static uint32_t cFrequency[200];
51
52static DECLCALLBACK(void) TimerCallback(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
53{
54 gcTicks++;
55
56 const uint64_t u64Now = RTTimeNanoTS();
57 if (gu64Prev)
58 {
59 const uint64_t u64Delta = u64Now - gu64Prev;
60 if (u64Delta < gu64Min)
61 gu64Min = u64Delta;
62 if (u64Delta > gu64Max)
63 gu64Max = u64Delta;
64 int i = (int)( RT_ELEMENTS(cFrequency)
65 - (u64Delta * (RT_ELEMENTS(cFrequency) / 2) / gu64Norm));
66 if (i >= 0 && i < (int)RT_ELEMENTS(cFrequency))
67 cFrequency[i]++;
68 }
69 gu64Prev = u64Now;
70}
71
72
73int main()
74{
75 /*
76 * Init runtime
77 */
78 unsigned cErrors = 0;
79 int rc = RTR3InitExeNoArguments(0);
80 if (RT_FAILURE(rc))
81 return RTMsgInitFailure(rc);
82
83 /*
84 * Check that the clock is reliable.
85 */
86 RTPrintf("tstTimer: TESTING - RTTimeNanoTS() for 2sec\n");
87 uint64_t uTSMillies = RTTimeMilliTS();
88 uint64_t uTSBegin = RTTimeNanoTS();
89 uint64_t uTSLast = uTSBegin;
90 uint64_t uTSDiff;
91 uint64_t cIterations = 0;
92
93 do
94 {
95 uint64_t uTS = RTTimeNanoTS();
96 if (uTS < uTSLast)
97 {
98 RTPrintf("tstTimer: FAILURE - RTTimeNanoTS() is unreliable. uTS=%RU64 uTSLast=%RU64\n", uTS, uTSLast);
99 cErrors++;
100 }
101 if (++cIterations > (2*1000*1000*1000))
102 {
103 RTPrintf("tstTimer: FAILURE - RTTimeNanoTS() is unreliable. cIterations=%RU64 uTS=%RU64 uTSBegin=%RU64\n", cIterations, uTS, uTSBegin);
104 return 1;
105 }
106 uTSLast = uTS;
107 uTSDiff = uTSLast - uTSBegin;
108 } while (uTSDiff < (2*1000*1000*1000));
109 uTSMillies = RTTimeMilliTS() - uTSMillies;
110 if (uTSMillies >= 2500 || uTSMillies <= 1500)
111 {
112 RTPrintf("tstTimer: FAILURE - uTSMillies=%RI64 uTSBegin=%RU64 uTSLast=%RU64 uTSDiff=%RU64\n",
113 uTSMillies, uTSBegin, uTSLast, uTSDiff);
114 cErrors++;
115 }
116 if (!cErrors)
117 RTPrintf("tstTimer: OK - RTTimeNanoTS()\n");
118
119 /*
120 * Tests.
121 */
122 static struct
123 {
124 unsigned uMicroInterval;
125 unsigned uMilliesWait;
126 unsigned cLower;
127 unsigned cUpper;
128 } aTests[] =
129 {
130 { 32000, 2000, 0, 0 },
131 { 20000, 2000, 0, 0 },
132 { 10000, 2000, 0, 0 },
133 { 8000, 2000, 0, 0 },
134 { 2000, 2000, 0, 0 },
135 { 1000, 2000, 0, 0 },
136 { 500, 5000, 0, 0 },
137 { 200, 5000, 0, 0 },
138 { 100, 5000, 0, 0 }
139 };
140
141 unsigned i = 0;
142 for (i = 0; i < RT_ELEMENTS(aTests); i++)
143 {
144 aTests[i].cLower = (aTests[i].uMilliesWait*1000 - aTests[i].uMilliesWait*100) / aTests[i].uMicroInterval;
145 aTests[i].cUpper = (aTests[i].uMilliesWait*1000 + aTests[i].uMilliesWait*100) / aTests[i].uMicroInterval;
146 gu64Norm = aTests[i].uMicroInterval*1000;
147
148 RTPrintf("\n"
149 "tstTimer: TESTING - %d us interval, %d ms wait, expects %d-%d ticks.\n",
150 aTests[i].uMicroInterval, aTests[i].uMilliesWait, aTests[i].cLower, aTests[i].cUpper);
151
152 /*
153 * Start timer which ticks every 10ms.
154 */
155 gcTicks = 0;
156 PRTTIMER pTimer;
157 gu64Max = 0;
158 gu64Min = UINT64_MAX;
159 gu64Prev = 0;
160 RT_ZERO(cFrequency);
161#ifdef RT_OS_WINDOWS
162 if (aTests[i].uMicroInterval < 1000)
163 continue;
164 rc = RTTimerCreate(&pTimer, aTests[i].uMicroInterval / 1000, TimerCallback, NULL);
165#else
166 rc = RTTimerCreateEx(&pTimer, aTests[i].uMicroInterval * (uint64_t)1000, 0, TimerCallback, NULL);
167#endif
168 if (RT_FAILURE(rc))
169 {
170 RTPrintf("tstTimer: FAILURE - RTTimerCreateEx(,%u*1M,,,) -> %Rrc\n", aTests[i].uMicroInterval, rc);
171 cErrors++;
172 continue;
173 }
174
175 /*
176 * Start the timer and active waiting for the requested test period.
177 */
178 uTSBegin = RTTimeNanoTS();
179#ifndef RT_OS_WINDOWS
180 rc = RTTimerStart(pTimer, 0);
181 if (RT_FAILURE(rc))
182 {
183 RTPrintf("tstTimer: FAILURE - RTTimerStart(,0) -> %Rrc\n", aTests[i].uMicroInterval, rc);
184 cErrors++;
185 }
186#endif
187
188 while (RTTimeNanoTS() - uTSBegin < (uint64_t)aTests[i].uMilliesWait * 1000000)
189 /* nothing */;
190
191 /* destroy the timer */
192 uint64_t uTSEnd = RTTimeNanoTS();
193 uTSDiff = uTSEnd - uTSBegin;
194 rc = RTTimerDestroy(pTimer);
195 if (RT_FAILURE(rc))
196 {
197 RTPrintf("tstTimer: FAILURE - RTTimerDestroy() -> %d gcTicks=%d\n", rc, gcTicks);
198 cErrors++;
199 }
200
201 RTPrintf("tstTimer: uTS=%RI64 (%RU64 - %RU64)\n", uTSDiff, uTSBegin, uTSEnd);
202 unsigned cTicks = gcTicks;
203 RTThreadSleep(aTests[i].uMicroInterval/1000 * 3);
204 if (gcTicks != cTicks)
205 {
206 RTPrintf("tstTimer: FAILURE - RTTimerDestroy() didn't really stop the timer! gcTicks=%d cTicks=%d\n", gcTicks, cTicks);
207 cErrors++;
208 continue;
209 }
210
211 /*
212 * Check the number of ticks.
213 */
214 if (gcTicks < aTests[i].cLower)
215 {
216 RTPrintf("tstTimer: FAILURE - Too few ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
217 cErrors++;
218 }
219 else if (gcTicks > aTests[i].cUpper)
220 {
221 RTPrintf("tstTimer: FAILURE - Too many ticks gcTicks=%d (expected %d-%d)", gcTicks, aTests[i].cUpper, aTests[i].cLower);
222 cErrors++;
223 }
224 else
225 RTPrintf("tstTimer: OK - gcTicks=%d", gcTicks);
226 RTPrintf(" min=%RU64 max=%RU64\n", gu64Min, gu64Max);
227
228 for (int j = 0; j < (int)RT_ELEMENTS(cFrequency); j++)
229 {
230 uint32_t len = cFrequency[j] * 70 / gcTicks;
231 uint32_t deviation = j - RT_ELEMENTS(cFrequency) / 2;
232 uint64_t u64FreqPercent = (uint64_t)cFrequency[j] * 10000 / gcTicks;
233 uint64_t u64FreqPercentFrac = u64FreqPercent % 100;
234 u64FreqPercent = u64FreqPercent / 100;
235 RTPrintf("%+4d%c %6u %3llu.%02llu%% ",
236 deviation, deviation == 0 ? ' ' : '%', cFrequency[j],
237 u64FreqPercent, u64FreqPercentFrac);
238 for (unsigned k = 0; k < len; k++)
239 RTPrintf("*");
240 RTPrintf("\n");
241 }
242 }
243
244 /*
245 * Summary.
246 */
247 if (!cErrors)
248 RTPrintf("tstTimer: SUCCESS\n");
249 else
250 RTPrintf("tstTimer: FAILURE %d errors\n", cErrors);
251 return !!cErrors;
252}
253
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