VirtualBox

source: vbox/trunk/src/VBox/Runtime/testcase/tstRTTime.cpp

Last change on this file was 106061, checked in by vboxsync, 2 months ago

Copyright year updates by scm.

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1/* $Id: tstRTTime.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2/** @file
3 * IPRT Testcase - Simple RTTime tests (requires GIP).
4 */
5
6/*
7 * Copyright (C) 2006-2024 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include <iprt/time.h>
42
43#include <iprt/errcore.h>
44#include <iprt/initterm.h>
45#include <iprt/message.h>
46#include <iprt/test.h>
47#include <iprt/thread.h>
48
49int main()
50{
51 /*
52 * Init.
53 */
54 RTTEST hTest;
55 RTEXITCODE rcExit = RTTestInitExAndCreate(0, NULL, RTR3INIT_FLAGS_SUPLIB, "tstRTTime", &hTest);
56 if (rcExit != RTEXITCODE_SUCCESS)
57 return rcExit;
58 RTTestBanner(hTest);
59
60 /*
61 * RTNanoTimeTS() shall never return something which
62 * is less or equal to the return of the previous call.
63 */
64
65 /* Take down the start time of both sources, try get them w/o being rescheduled. */
66 RTTimeSystemNanoTS(); RTTimeNanoTS(); RTThreadYield();
67 uint64_t u64RTStartTS = RTTimeNanoTS();
68 uint64_t u64OSStartTS = RTTimeSystemNanoTS();
69 uint64_t const cNsMaxTolerance = 256 * RT_NS_1US;
70 for (unsigned cTries = 0; cTries < 32 && RTTimeNanoTS() - u64RTStartTS > cNsMaxTolerance; cTries++)
71 {
72 RTThreadYield();
73 u64RTStartTS = RTTimeNanoTS();
74 u64OSStartTS = RTTimeSystemNanoTS();
75 }
76
77 /* Test loop. */
78 uint32_t i;
79 uint64_t u64Prev = RTTimeNanoTS();
80 for (i = 0; i < 100*_1M; i++)
81 {
82 uint64_t u64 = RTTimeNanoTS();
83 if (u64 <= u64Prev)
84 {
85 /** @todo wrapping detection. */
86 RTTestFailed(hTest, "i=%#010x u64=%#llx u64Prev=%#llx (1)\n", i, u64, u64Prev);
87 if (RTTestErrorCount(hTest) >= 256)
88 break;
89 RTThreadYield();
90 u64 = RTTimeNanoTS();
91 }
92 else if (u64 - u64Prev > 1000000000 /* 1sec */)
93 {
94 RTTestFailed(hTest, "i=%#010x u64=%#llx u64Prev=%#llx delta=%lld\n", i, u64, u64Prev, u64 - u64Prev);
95 if (RTTestErrorCount(hTest) >= 256)
96 break;
97 RTThreadYield();
98 u64 = RTTimeNanoTS();
99 }
100 if (!(i & (_1M*2 - 1)))
101 {
102 RTTestPrintf(hTest, RTTESTLVL_INFO, "i=%#010x u64=%#llx u64Prev=%#llx delta=%lld\n", i, u64, u64Prev, u64 - u64Prev);
103 RTThreadYield();
104 u64 = RTTimeNanoTS();
105 }
106 u64Prev = u64;
107 }
108
109 /* Take down the stop time of both sources, again try get them w/o being rescheduled. */
110 RTTimeSystemNanoTS(); RTTimeNanoTS(); RTThreadYield();
111 uint64_t u64RTElapsedTS = RTTimeNanoTS();
112 uint64_t u64OSElapsedTS = RTTimeSystemNanoTS();
113 for (unsigned cTries = 0; cTries < 32 && RTTimeNanoTS() - u64RTElapsedTS > cNsMaxTolerance; cTries++)
114 {
115 RTThreadYield();
116 u64RTElapsedTS = RTTimeNanoTS();
117 u64OSElapsedTS = RTTimeSystemNanoTS();
118 }
119 u64RTElapsedTS -= u64RTStartTS;
120 u64OSElapsedTS -= u64OSStartTS;
121
122 /* Check the runtime difference between the two sources. */
123 int64_t i64Diff = u64OSElapsedTS >= u64RTElapsedTS ? u64OSElapsedTS - u64RTElapsedTS : u64RTElapsedTS - u64OSElapsedTS;
124 if (i64Diff > (int64_t)(RT_MAX(u64OSElapsedTS / 1000, cNsMaxTolerance)))
125 RTTestFailed(hTest, "total time differs too much! u64OSElapsedTS=%#llx u64RTElapsedTS=%#llx delta=%lld\n",
126 u64OSElapsedTS, u64RTElapsedTS, u64OSElapsedTS - u64RTElapsedTS);
127 else
128 {
129 if (u64OSElapsedTS >= u64RTElapsedTS)
130 RTTestValue(hTest, "Total time delta", u64OSElapsedTS - u64RTElapsedTS, RTTESTUNIT_NS);
131 else
132 RTTestValue(hTest, "Total time delta", u64RTElapsedTS - u64OSElapsedTS, RTTESTUNIT_NS);
133 RTTestPrintf(hTest, RTTESTLVL_INFO, "total time difference: u64OSElapsedTS=%#llx u64RTElapsedTS=%#llx delta=%lld\n",
134 u64OSElapsedTS, u64RTElapsedTS, u64OSElapsedTS - u64RTElapsedTS);
135 }
136
137 /* Report debug details: */
138#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) /** @todo This isn't really x86 or AMD64 specific... */
139 RTTestValue(hTest, "RTTimeDbgSteps", RTTimeDbgSteps(), RTTESTUNIT_OCCURRENCES);
140 RTTestValue(hTest, "RTTimeDbgSteps pp", ((uint64_t)RTTimeDbgSteps() * 1000) / i, RTTESTUNIT_PP1K);
141 RTTestValue(hTest, "RTTimeDbgExpired", RTTimeDbgExpired(), RTTESTUNIT_OCCURRENCES);
142 RTTestValue(hTest, "RTTimeDbgExpired pp", ((uint64_t)RTTimeDbgExpired() * 1000) / i, RTTESTUNIT_PP1K);
143 RTTestValue(hTest, "RTTimeDbgBad", RTTimeDbgBad(), RTTESTUNIT_OCCURRENCES);
144 RTTestValue(hTest, "RTTimeDbgBad pp", ((uint64_t)RTTimeDbgBad() * 1000) / i, RTTESTUNIT_PP1K);
145 RTTestValue(hTest, "RTTimeDbgRaces", RTTimeDbgRaces(), RTTESTUNIT_OCCURRENCES);
146 RTTestValue(hTest, "RTTimeDbgRaces pp", ((uint64_t)RTTimeDbgRaces() * 1000) / i, RTTESTUNIT_PP1K);
147#endif
148
149 return RTTestSummaryAndDestroy(hTest);
150}
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