| 1 | /* $Id: tstSemMutex.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT Testcase - Simple Mutex Semaphore Smoke Test.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 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 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/semaphore.h>
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| 32 | #include <iprt/string.h>
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| 33 | #include <iprt/thread.h>
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| 34 | #include <iprt/stream.h>
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| 35 | #include <iprt/time.h>
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| 36 | #include <iprt/initterm.h>
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| 37 | #include <iprt/asm.h>
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| 38 | #include <iprt/assert.h>
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| 39 |
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| 40 |
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| 41 | /*********************************************************************************************************************************
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| 42 | * Global Variables *
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| 43 | *********************************************************************************************************************************/
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| 44 | static RTSEMMUTEX g_hMutex = NIL_RTSEMMUTEX;
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| 45 | static bool volatile g_fTerminate;
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| 46 | static bool g_fYield;
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| 47 | static bool g_fQuiet;
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| 48 | static uint32_t volatile g_cbConcurrent;
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| 49 | static uint32_t volatile g_cErrors;
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| 50 |
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| 51 |
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| 52 | int PrintError(const char *pszFormat, ...)
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| 53 | {
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| 54 | ASMAtomicIncU32(&g_cErrors);
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| 55 |
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| 56 | RTPrintf("tstSemMutex: FAILURE - ");
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| 57 | va_list va;
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| 58 | va_start(va, pszFormat);
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| 59 | RTPrintfV(pszFormat, va);
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| 60 | va_end(va);
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| 61 |
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| 62 | return 1;
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| 63 | }
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| 64 |
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| 65 |
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| 66 | static DECLCALLBACK(int) ThreadTest1(RTTHREAD ThreadSelf, void *pvUser)
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| 67 | {
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| 68 | uint64_t *pu64 = (uint64_t *)pvUser;
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| 69 | for (;;)
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| 70 | {
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| 71 | int rc = RTSemMutexRequestNoResume(g_hMutex, RT_INDEFINITE_WAIT);
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| 72 | if (RT_FAILURE(rc))
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| 73 | {
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| 74 | PrintError("%x: RTSemMutexRequestNoResume failed with %Rrc\n", rc);
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| 75 | break;
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| 76 | }
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| 77 | if (ASMAtomicIncU32(&g_cbConcurrent) != 1)
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| 78 | {
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| 79 | PrintError("g_cbConcurrent=%d after request!\n", g_cbConcurrent);
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| 80 | break;
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| 81 | }
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| 82 |
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| 83 | /*
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| 84 | * Check for fairness: The values of the threads should not differ too much
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| 85 | */
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| 86 | (*pu64)++;
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| 87 |
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| 88 | /*
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| 89 | * Check for correctness: Give other threads a chance. If the implementation is
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| 90 | * correct, no other thread will be able to enter this lock now.
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| 91 | */
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| 92 | if (g_fYield)
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| 93 | RTThreadYield();
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| 94 | if (ASMAtomicDecU32(&g_cbConcurrent) != 0)
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| 95 | {
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| 96 | PrintError("g_cbConcurrent=%d before release!\n", g_cbConcurrent);
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| 97 | break;
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| 98 | }
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| 99 | rc = RTSemMutexRelease(g_hMutex);
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| 100 | if (RT_FAILURE(rc))
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| 101 | {
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| 102 | PrintError("%x: RTSemMutexRelease failed with %Rrc\n", rc);
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| 103 | break;
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| 104 | }
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| 105 | if (g_fTerminate)
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| 106 | break;
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| 107 | }
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| 108 | if (!g_fQuiet)
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| 109 | RTPrintf("tstSemMutex: Thread %08x exited with %lld\n", ThreadSelf, *pu64);
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| 110 | return VINF_SUCCESS;
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| 111 | }
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| 112 |
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| 113 |
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| 114 | static int Test1(unsigned cThreads, unsigned cSeconds, bool fYield, bool fQuiet)
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| 115 | {
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| 116 | int rc;
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| 117 | unsigned i;
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| 118 | uint64_t g_au64[32];
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| 119 | RTTHREAD aThreads[RT_ELEMENTS(g_au64)];
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| 120 | AssertRelease(cThreads <= RT_ELEMENTS(g_au64));
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| 121 |
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| 122 | /*
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| 123 | * Init globals.
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| 124 | */
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| 125 | g_fYield = fYield;
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| 126 | g_fQuiet = fQuiet;
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| 127 | g_fTerminate = false;
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| 128 |
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| 129 | rc = RTSemMutexCreate(&g_hMutex);
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| 130 | if (RT_FAILURE(rc))
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| 131 | return PrintError("RTSemMutexCreate failed (rc=%Rrc)\n", rc);
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| 132 |
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| 133 | /*
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| 134 | * Create the threads and let them block on the mutex.
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| 135 | */
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| 136 | rc = RTSemMutexRequest(g_hMutex, RT_INDEFINITE_WAIT);
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| 137 | if (RT_FAILURE(rc))
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| 138 | return PrintError("RTSemMutexRequest failed (rc=%Rrc)\n", rc);
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| 139 |
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| 140 | for (i = 0; i < cThreads; i++)
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| 141 | {
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| 142 | g_au64[i] = 0;
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| 143 | rc = RTThreadCreate(&aThreads[i], ThreadTest1, &g_au64[i], 0, RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "test");
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| 144 | if (RT_FAILURE(rc))
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| 145 | return PrintError("RTThreadCreate failed for thread %u (rc=%Rrc)\n", i, rc);
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| 146 | }
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| 147 |
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| 148 | if (!fQuiet)
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| 149 | RTPrintf("tstSemMutex: %zu Threads created. Racing them for %u seconds (%s) ...\n",
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| 150 | cThreads, cSeconds, g_fYield ? "yielding" : "no yielding");
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| 151 |
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| 152 | uint64_t u64StartTS = RTTimeNanoTS();
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| 153 | rc = RTSemMutexRelease(g_hMutex);
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| 154 | if (RT_FAILURE(rc))
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| 155 | PrintError("RTSemMutexRelease failed (rc=%Rrc)\n", rc);
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| 156 | RTThreadSleep(cSeconds * 1000);
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| 157 | ASMAtomicXchgBool(&g_fTerminate, true);
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| 158 | uint64_t ElapsedNS = RTTimeNanoTS() - u64StartTS;
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| 159 |
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| 160 | for (i = 0; i < cThreads; i++)
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| 161 | {
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| 162 | rc = RTThreadWait(aThreads[i], 5000, NULL);
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| 163 | if (RT_FAILURE(rc))
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| 164 | PrintError("RTThreadWait failed for thread %u (rc=%Rrc)\n", i, rc);
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| 165 | }
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| 166 |
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| 167 | rc = RTSemMutexDestroy(g_hMutex);
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| 168 | if (RT_FAILURE(rc))
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| 169 | PrintError("RTSemMutexDestroy failed - %Rrc\n", rc);
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| 170 | g_hMutex = NIL_RTSEMMUTEX;
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| 171 | if (g_cErrors)
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| 172 | RTThreadSleep(100);
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| 173 |
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| 174 | /*
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| 175 | * Collect and display the results.
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| 176 | */
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| 177 | uint64_t Total = g_au64[0];
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| 178 | for (i = 1; i < cThreads; i++)
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| 179 | Total += g_au64[i];
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| 180 |
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| 181 | uint64_t Normal = Total / cThreads;
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| 182 | uint64_t MaxDeviation = 0;
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| 183 | for (i = 0; i < cThreads; i++)
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| 184 | {
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| 185 | uint64_t Delta = RT_ABS((int64_t)(g_au64[i] - Normal));
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| 186 | if (Delta > Normal / 2)
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| 187 | RTPrintf("tstSemMutex: Warning! Thread %d deviates by more than 50%% - %llu (it) vs. %llu (avg)\n",
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| 188 | i, g_au64[i], Normal);
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| 189 | if (Delta > MaxDeviation)
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| 190 | MaxDeviation = Delta;
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| 191 |
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| 192 | }
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| 193 |
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| 194 | RTPrintf("tstSemMutex: Threads: %u Total: %llu Per Sec: %llu Avg: %llu ns Max dev: %llu%%\n",
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| 195 | cThreads,
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| 196 | Total,
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| 197 | Total / cSeconds,
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| 198 | ElapsedNS / Total,
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| 199 | MaxDeviation * 100 / Normal
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| 200 | );
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| 201 | return 0;
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| 202 | }
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| 203 |
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| 204 |
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| 205 | int main(int argc, char **argv)
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| 206 | {
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| 207 | int rc = RTR3InitExe(argc, &argv, 0);
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| 208 | if (RT_FAILURE(rc))
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| 209 | {
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| 210 | RTPrintf("tstSemMutex: RTR3InitExe failed (rc=%Rrc)\n", rc);
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| 211 | return 1;
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| 212 | }
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| 213 | RTPrintf("tstSemMutex: TESTING...\n");
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| 214 |
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| 215 | if (argc == 1)
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| 216 | {
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| 217 | /* threads, seconds, yield, quiet */
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| 218 | Test1( 1, 1, true, false);
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| 219 | Test1( 2, 1, true, false);
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| 220 | Test1( 10, 1, true, false);
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| 221 | Test1( 10, 10, false, false);
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| 222 |
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| 223 | RTPrintf("tstSemMutex: benchmarking...\n");
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| 224 | for (unsigned cThreads = 1; cThreads < 32; cThreads++)
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| 225 | Test1(cThreads, 2, false, true);
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| 226 |
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| 227 | /** @todo add a testcase where some stuff times out. */
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| 228 | }
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| 229 | else
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| 230 | {
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| 231 | /* threads, seconds, yield, quiet */
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| 232 | RTPrintf("tstSemMutex: benchmarking...\n");
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| 233 | Test1( 1, 3, false, true);
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| 234 | Test1( 1, 3, false, true);
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| 235 | Test1( 1, 3, false, true);
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| 236 | Test1( 2, 3, false, true);
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| 237 | Test1( 2, 3, false, true);
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| 238 | Test1( 2, 3, false, true);
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| 239 | Test1( 3, 3, false, true);
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| 240 | Test1( 3, 3, false, true);
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| 241 | Test1( 3, 3, false, true);
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| 242 | }
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| 243 |
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| 244 | if (!g_cErrors)
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| 245 | RTPrintf("tstSemMutex: SUCCESS\n");
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| 246 | else
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| 247 | RTPrintf("tstSemMutex: FAILURE - %u errors\n", g_cErrors);
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| 248 | return g_cErrors != 0;
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| 249 | }
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| 250 |
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