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/* $Id: tstSemMutex.cpp $ */
/** @file
* IPRT Testcase - Simple Mutex Semaphore Smoke Test.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/semaphore.h>
#include <iprt/string.h>
#include <iprt/thread.h>
#include <iprt/stream.h>
#include <iprt/time.h>
#include <iprt/initterm.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
static RTSEMMUTEX g_hMutex = NIL_RTSEMMUTEX;
static bool volatile g_fTerminate;
static bool g_fYield;
static bool g_fQuiet;
static uint32_t volatile g_cbConcurrent;
static uint32_t volatile g_cErrors;
int PrintError(const char *pszFormat, ...)
{
ASMAtomicIncU32(&g_cErrors);
RTPrintf("tstSemMutex: FAILURE - ");
va_list va;
va_start(va, pszFormat);
RTPrintfV(pszFormat, va);
va_end(va);
return 1;
}
static DECLCALLBACK(int) ThreadTest1(RTTHREAD ThreadSelf, void *pvUser)
{
uint64_t *pu64 = (uint64_t *)pvUser;
for (;;)
{
int rc = RTSemMutexRequestNoResume(g_hMutex, RT_INDEFINITE_WAIT);
if (RT_FAILURE(rc))
{
PrintError("%x: RTSemMutexRequestNoResume failed with %Rrc\n", rc);
break;
}
if (ASMAtomicIncU32(&g_cbConcurrent) != 1)
{
PrintError("g_cbConcurrent=%d after request!\n", g_cbConcurrent);
break;
}
/*
* Check for fairness: The values of the threads should not differ too much
*/
(*pu64)++;
/*
* Check for correctness: Give other threads a chance. If the implementation is
* correct, no other thread will be able to enter this lock now.
*/
if (g_fYield)
RTThreadYield();
if (ASMAtomicDecU32(&g_cbConcurrent) != 0)
{
PrintError("g_cbConcurrent=%d before release!\n", g_cbConcurrent);
break;
}
rc = RTSemMutexRelease(g_hMutex);
if (RT_FAILURE(rc))
{
PrintError("%x: RTSemMutexRelease failed with %Rrc\n", rc);
break;
}
if (g_fTerminate)
break;
}
if (!g_fQuiet)
RTPrintf("tstSemMutex: Thread %08x exited with %lld\n", ThreadSelf, *pu64);
return VINF_SUCCESS;
}
static int Test1(unsigned cThreads, unsigned cSeconds, bool fYield, bool fQuiet)
{
int rc;
unsigned i;
uint64_t g_au64[32];
RTTHREAD aThreads[RT_ELEMENTS(g_au64)];
AssertRelease(cThreads <= RT_ELEMENTS(g_au64));
/*
* Init globals.
*/
g_fYield = fYield;
g_fQuiet = fQuiet;
g_fTerminate = false;
rc = RTSemMutexCreate(&g_hMutex);
if (RT_FAILURE(rc))
return PrintError("RTSemMutexCreate failed (rc=%Rrc)\n", rc);
/*
* Create the threads and let them block on the mutex.
*/
rc = RTSemMutexRequest(g_hMutex, RT_INDEFINITE_WAIT);
if (RT_FAILURE(rc))
return PrintError("RTSemMutexRequest failed (rc=%Rrc)\n", rc);
for (i = 0; i < cThreads; i++)
{
g_au64[i] = 0;
rc = RTThreadCreate(&aThreads[i], ThreadTest1, &g_au64[i], 0, RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "test");
if (RT_FAILURE(rc))
return PrintError("RTThreadCreate failed for thread %u (rc=%Rrc)\n", i, rc);
}
if (!fQuiet)
RTPrintf("tstSemMutex: %zu Threads created. Racing them for %u seconds (%s) ...\n",
cThreads, cSeconds, g_fYield ? "yielding" : "no yielding");
uint64_t u64StartTS = RTTimeNanoTS();
rc = RTSemMutexRelease(g_hMutex);
if (RT_FAILURE(rc))
PrintError("RTSemMutexRelease failed (rc=%Rrc)\n", rc);
RTThreadSleep(cSeconds * 1000);
ASMAtomicXchgBool(&g_fTerminate, true);
uint64_t ElapsedNS = RTTimeNanoTS() - u64StartTS;
for (i = 0; i < cThreads; i++)
{
rc = RTThreadWait(aThreads[i], 5000, NULL);
if (RT_FAILURE(rc))
PrintError("RTThreadWait failed for thread %u (rc=%Rrc)\n", i, rc);
}
rc = RTSemMutexDestroy(g_hMutex);
if (RT_FAILURE(rc))
PrintError("RTSemMutexDestroy failed - %Rrc\n", rc);
g_hMutex = NIL_RTSEMMUTEX;
if (g_cErrors)
RTThreadSleep(100);
/*
* Collect and display the results.
*/
uint64_t Total = g_au64[0];
for (i = 1; i < cThreads; i++)
Total += g_au64[i];
uint64_t Normal = Total / cThreads;
uint64_t MaxDeviation = 0;
for (i = 0; i < cThreads; i++)
{
uint64_t Delta = RT_ABS((int64_t)(g_au64[i] - Normal));
if (Delta > Normal / 2)
RTPrintf("tstSemMutex: Warning! Thread %d deviates by more than 50%% - %llu (it) vs. %llu (avg)\n",
i, g_au64[i], Normal);
if (Delta > MaxDeviation)
MaxDeviation = Delta;
}
RTPrintf("tstSemMutex: Threads: %u Total: %llu Per Sec: %llu Avg: %llu ns Max dev: %llu%%\n",
cThreads,
Total,
Total / cSeconds,
ElapsedNS / Total,
MaxDeviation * 100 / Normal
);
return 0;
}
int main(int argc, char **argv)
{
int rc = RTR3InitExe(argc, &argv, 0);
if (RT_FAILURE(rc))
{
RTPrintf("tstSemMutex: RTR3InitExe failed (rc=%Rrc)\n", rc);
return 1;
}
RTPrintf("tstSemMutex: TESTING...\n");
if (argc == 1)
{
/* threads, seconds, yield, quiet */
Test1( 1, 1, true, false);
Test1( 2, 1, true, false);
Test1( 10, 1, true, false);
Test1( 10, 10, false, false);
RTPrintf("tstSemMutex: benchmarking...\n");
for (unsigned cThreads = 1; cThreads < 32; cThreads++)
Test1(cThreads, 2, false, true);
/** @todo add a testcase where some stuff times out. */
}
else
{
/* threads, seconds, yield, quiet */
RTPrintf("tstSemMutex: benchmarking...\n");
Test1( 1, 3, false, true);
Test1( 1, 3, false, true);
Test1( 1, 3, false, true);
Test1( 2, 3, false, true);
Test1( 2, 3, false, true);
Test1( 2, 3, false, true);
Test1( 3, 3, false, true);
Test1( 3, 3, false, true);
Test1( 3, 3, false, true);
}
if (!g_cErrors)
RTPrintf("tstSemMutex: SUCCESS\n");
else
RTPrintf("tstSemMutex: FAILURE - %u errors\n", g_cErrors);
return g_cErrors != 0;
}
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