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|
/* $Id: tstRTSemEvent.cpp $ */
/** @file
* IPRT Testcase - Multiple Release Event Semaphores.
*/
/*
* Copyright (C) 2009-2023 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/asm.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/rand.h>
#include <iprt/stream.h>
#include <iprt/string.h>
#include <iprt/test.h>
#include <iprt/thread.h>
#include <iprt/time.h>
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** The test handle. */
static RTTEST g_hTest;
/** Use to stop test loops. */
static volatile bool g_fStop = false;
/*********************************************************************************************************************************
* Benchmark #1: Two thread pinging each other on two event sempahores. *
*********************************************************************************************************************************/
/** Pair of event semphores for the first benchmark test. */
static RTSEMEVENT g_ahEvtBench1[2];
static uint64_t g_uTimeoutBench1;
static uint64_t g_fWaitBench1;
static uint64_t volatile g_cBench1Iterations;
static DECLCALLBACK(int) bench1Thread(RTTHREAD hThreadSelf, void *pvUser)
{
uintptr_t const idxThread = (uintptr_t)pvUser;
RT_NOREF(hThreadSelf);
uint64_t cIterations = 0;
for (;; cIterations++)
{
int rc = RTSemEventWaitEx(g_ahEvtBench1[idxThread], g_fWaitBench1, g_uTimeoutBench1);
if (RT_SUCCESS(rc))
RTTEST_CHECK_RC(g_hTest, RTSemEventSignal(g_ahEvtBench1[(idxThread + 1) & 1]), VINF_SUCCESS);
else if ( rc == VERR_TIMEOUT
&& g_uTimeoutBench1 == 0
&& (g_fWaitBench1 & RTSEMWAIT_FLAGS_RELATIVE) )
{ /* likely */ }
else
RTTestFailed(g_hTest, "rc=%Rrc g_fWaitBench1=%#x g_uTimeoutBench1=%#RX64 (now=%#RX64)",
rc, g_fWaitBench1, g_uTimeoutBench1, RTTimeSystemNanoTS());
if (g_fStop)
{
RTTEST_CHECK_RC(g_hTest, RTSemEventSignal(g_ahEvtBench1[(idxThread + 1) & 1]), VINF_SUCCESS);
break;
}
}
if (idxThread == 0)
g_cBench1Iterations = cIterations;
return VINF_SUCCESS;
}
static void bench1(const char *pszTest, uint32_t fFlags, uint64_t uTimeout)
{
RTTestISub(pszTest);
/*
* Create the two threads and make the wait on one another's sempahore.
*/
g_fStop = false;
g_uTimeoutBench1 = uTimeout;
g_fWaitBench1 = fFlags;
RTTESTI_CHECK_RC_RETV(RTSemEventCreate(&g_ahEvtBench1[0]), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventCreate(&g_ahEvtBench1[1]), VINF_SUCCESS);
RTTHREAD hThread1;
RTTESTI_CHECK_RC_RETV(RTThreadCreate(&hThread1, bench1Thread, (void *)0, 0, RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "bench1t1"), VINF_SUCCESS);
RTTHREAD hThread2;
RTTESTI_CHECK_RC_RETV(RTThreadCreate(&hThread2, bench1Thread, (void *)1, 0, RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "bench1t2"), VINF_SUCCESS);
RTThreadSleep(256);
/*
* Kick off the first thread and wait for 5 seconds before stopping them
* and seeing how many iterations they managed to perform.
*/
uint64_t const nsStart = RTTimeNanoTS();
RTTESTI_CHECK_RC(RTSemEventSignal(g_ahEvtBench1[0]), VINF_SUCCESS);
RTThreadSleep(RT_MS_5SEC);
ASMAtomicWriteBool(&g_fStop, true);
uint64_t const cNsElapsed = RTTimeNanoTS() - nsStart;
RTTESTI_CHECK_RC(RTSemEventSignal(g_ahEvtBench1[0]), VINF_SUCCESS); /* paranoia */
RTTESTI_CHECK_RC(RTThreadWait(hThread1, RT_MS_5SEC, NULL), VINF_SUCCESS);
RTTESTI_CHECK_RC(RTSemEventSignal(g_ahEvtBench1[1]), VINF_SUCCESS);
RTTESTI_CHECK_RC(RTThreadWait(hThread2, RT_MS_5SEC, NULL), VINF_SUCCESS);
RTTESTI_CHECK_RC(RTSemEventDestroy(g_ahEvtBench1[0]), VINF_SUCCESS);
RTTESTI_CHECK_RC(RTSemEventDestroy(g_ahEvtBench1[1]), VINF_SUCCESS);
/*
* Report the result.
*/
uint64_t cIterations = g_cBench1Iterations;
RTTestValue(g_hTest, "Throughput", cIterations * RT_NS_1SEC / cNsElapsed, RTTESTUNIT_OCCURRENCES_PER_SEC);
RTTestValue(g_hTest, "Roundtrip", cNsElapsed / RT_MAX(cIterations, 1), RTTESTUNIT_NS_PER_OCCURRENCE);
}
/*********************************************************************************************************************************
* Test #1: Simple setup checking wakup order of two waiting thread. *
*********************************************************************************************************************************/
static DECLCALLBACK(int) test1Thread(RTTHREAD hThreadSelf, void *pvUser)
{
RTSEMEVENT hSem = *(PRTSEMEVENT)pvUser;
RTTEST_CHECK_RC(g_hTest, RTThreadUserSignal(hThreadSelf), VINF_SUCCESS);
RTTEST_CHECK_RC(g_hTest, RTSemEventWait(hSem, RT_INDEFINITE_WAIT), VINF_SUCCESS);
return VINF_SUCCESS;
}
static void test1(void)
{
RTTestISub("Two threads");
/*
* Create the threads and let them block on the event semaphore one
* after the other.
*/
RTSEMEVENT hSem;
RTTESTI_CHECK_RC_RETV(RTSemEventCreate(&hSem), VINF_SUCCESS);
RTTHREAD hThread1;
RTTESTI_CHECK_RC_RETV(RTThreadCreate(&hThread1, test1Thread, &hSem, 0, RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "test1t1"), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTThreadUserWait(hThread1, RT_MS_30SEC), VINF_SUCCESS);
RTThreadSleep(256);
RTTHREAD hThread2;
RTTESTI_CHECK_RC_RETV(RTThreadCreate(&hThread2, test1Thread, &hSem, 0, RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "test1t2"), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTThreadUserWait(hThread2, RT_MS_30SEC), VINF_SUCCESS);
RTThreadSleep(256);
#if defined(RT_OS_SOLARIS)
/*
* The Single UNIX Specification v2 states: "If more than one thread is blocked on a
* condition variable, the scheduling policy determines the order in which threads
* are unblocked." On Solaris, the default scheduling policy, SCHED_OTHER, does not
* specify the order in which multiple threads blocked on a condition variable are
* awakened. Thus we can't guarantee which thread will wake up when the condition
* variable is signalled so instead of verifying the order of thread wakeup we
* simply verify that two signals wake both threads.
*/
/* Signal twice to wake up both threads */
RTTESTI_CHECK_RC(RTSemEventSignal(hSem), VINF_SUCCESS);
RTThreadSleep(256);
RTTESTI_CHECK_RC(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC(RTThreadWait(hThread1, 5000, NULL), VINF_SUCCESS);
RTTESTI_CHECK_RC(RTThreadWait(hThread2, 5000, NULL), VINF_SUCCESS);
#else
/*
* The Linux sched(7) man page states: "SCHED_OTHER is the standard Linux
* time-sharing scheduler ... the thread chosen to run is based on a dynamic
* priority that ... is based on the nice value and is increased for each time
* quantum the thread is ready to run, but denied to run by the scheduler." This
* means that in practice the thread blocked longest on the condition variable will
* be awakened first and thus we can verify the ordering below. FreeBSD and macOS
* don't seem to document their implementations for this scenario but empirically
* they behave similar to Linux.
*/
/* Signal once, hopefully waking up thread1: */
RTTESTI_CHECK_RC(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC(RTThreadWait(hThread1, 5000, NULL), VINF_SUCCESS);
/* Signal once more, hopefully waking up thread2: */
RTTESTI_CHECK_RC(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC(RTThreadWait(hThread2, 5000, NULL), VINF_SUCCESS);
#endif
RTTESTI_CHECK_RC(RTSemEventDestroy(hSem), VINF_SUCCESS);
}
/*********************************************************************************************************************************
* Basic tests *
*********************************************************************************************************************************/
/**
* Just do a number of short waits and calculate min, max and average.
*/
static void resolution(void)
{
RTTestISub("Timeout resolution");
RTSEMEVENT hSem;
RTTESTI_CHECK_RC_RETV(RTSemEventCreate(&hSem), VINF_SUCCESS);
uint64_t cNsMin = UINT64_MAX;
uint64_t cNsMax = 0;
uint64_t cNsTotal = 0;
uint32_t cLoops;
for (cLoops = 0; cLoops < 256; cLoops++)
{
uint64_t const nsStart = RTTimeNanoTS();
int rc = RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_NORESUME | RTSEMWAIT_FLAGS_RELATIVE | RTSEMWAIT_FLAGS_NANOSECS, RT_NS_1US);
uint64_t const cNsElapsed = RTTimeNanoTS() - nsStart;
RTTESTI_CHECK_RC(rc, VERR_TIMEOUT);
cNsTotal += cNsElapsed;
if (cNsElapsed < cNsMin)
cNsMin = cNsElapsed;
if (cNsElapsed > cNsMax)
cNsMax = cNsElapsed;
}
RTTestIValue("min", cNsMin, RTTESTUNIT_NS);
RTTestIValue("max", cNsMax, RTTESTUNIT_NS);
RTTestIValue("average", cNsTotal / cLoops, RTTESTUNIT_NS);
RTTestIValue("RTSemEventGetResolution", RTSemEventGetResolution(), RTTESTUNIT_NS);
RTTESTI_CHECK_RC_RETV(RTSemEventDestroy(hSem), VINF_SUCCESS);
}
static void testBasicsWaitTimeout(RTSEMEVENT hSem, unsigned i)
{
RTTESTI_CHECK_RC_RETV(RTSemEventWait(hSem, 0), VERR_TIMEOUT);
#if 0
RTTESTI_CHECK_RC_RETV(RTSemEventWaitNoResume(hSem, 0), VERR_TIMEOUT);
#else
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_RELATIVE,
0), VERR_TIMEOUT);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE,
RTTimeSystemNanoTS() + 1000*i), VERR_TIMEOUT);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE,
RTTimeNanoTS() + 1000*i), VERR_TIMEOUT);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_RELATIVE,
0), VERR_TIMEOUT);
#endif
}
static void testBasics(void)
{
RTTestISub("Basics");
RTSEMEVENT hSem;
RTTESTI_CHECK_RC_RETV(RTSemEventCreate(&hSem), VINF_SUCCESS);
/* The semaphore is created in a non-signalled state. */
testBasicsWaitTimeout(hSem, 0);
testBasicsWaitTimeout(hSem, 1);
if (RTTestIErrorCount())
return;
/* When signalling the semaphore, only the next waiter call shall
success, all subsequent ones should timeout as above. */
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWait(hSem, 0), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 0);
if (RTTestIErrorCount())
return;
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWait(hSem, 2), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 2);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWait(hSem, RT_INDEFINITE_WAIT), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
if (RTTestIErrorCount())
return;
/* Now do all the event wait ex variations: */
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_RELATIVE,
0),
VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_INDEFINITE, 0), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_NORESUME | RTSEMWAIT_FLAGS_INDEFINITE, 0), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE,
RTTimeSystemNanoTS() + RT_NS_1US), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE,
RTTimeNanoTS() + RT_NS_1US), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 0);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE,
RTTimeNanoTS() + RT_NS_1HOUR), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 0);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE,
0), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE,
_1G), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE,
UINT64_MAX), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 10);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_ABSOLUTE,
RTTimeSystemMilliTS() + RT_MS_1SEC), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_ABSOLUTE,
RTTimeMilliTS() + RT_MS_1SEC), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_ABSOLUTE,
0), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 0);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_ABSOLUTE,
_1M), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventWaitEx(hSem, RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_ABSOLUTE,
UINT64_MAX), VINF_SUCCESS);
testBasicsWaitTimeout(hSem, 1);
/* Destroy it. */
RTTESTI_CHECK_RC_RETV(RTSemEventDestroy(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventDestroy(NIL_RTSEMEVENT), VINF_SUCCESS);
/* Whether it is signalled or not used shouldn't matter. */
RTTESTI_CHECK_RC_RETV(RTSemEventCreate(&hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventSignal(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventDestroy(hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventCreate(&hSem), VINF_SUCCESS);
RTTESTI_CHECK_RC_RETV(RTSemEventDestroy(hSem), VINF_SUCCESS);
RTTestISubDone();
}
int main(int argc, char **argv)
{
RT_NOREF_PV(argc); RT_NOREF_PV(argv);
RTEXITCODE rcExit = RTTestInitAndCreate("tstRTSemEvent", &g_hTest);
if (rcExit != RTEXITCODE_SUCCESS)
return rcExit;
testBasics();
if (!RTTestErrorCount(g_hTest))
{
test1();
resolution();
}
if (!RTTestErrorCount(g_hTest))
{
bench1("Benchmark: Ping Pong, spin", RTSEMWAIT_FLAGS_NORESUME | RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_RELATIVE,
0);
bench1("Benchmark: Ping Pong, indefinite", RTSEMWAIT_FLAGS_NORESUME | RTSEMWAIT_FLAGS_INDEFINITE,
0);
bench1("Benchmark: Ping Pong, absolute", RTSEMWAIT_FLAGS_NORESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE,
RTTimeSystemNanoTS() + RT_NS_1HOUR);
bench1("Benchmark: Ping Pong, relative", RTSEMWAIT_FLAGS_NORESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_RELATIVE,
RT_NS_1HOUR);
bench1("Benchmark: Ping Pong, relative, resume", RTSEMWAIT_FLAGS_RESUME | RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_RELATIVE,
RT_NS_1HOUR);
}
return RTTestSummaryAndDestroy(g_hTest);
}
|
