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/* $Id: tstR0ThreadPreemption.cpp $ */
/** @file
* IPRT R0 Testcase - Thread Preemption.
*/
/*
* Copyright (C) 2009-2011 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <iprt/thread.h>
#include <iprt/asm-amd64-x86.h>
#include <iprt/err.h>
#include <iprt/time.h>
#include <iprt/string.h>
#include <VBox/sup.h>
#include "tstR0ThreadPreemption.h"
/**
* Service request callback function.
*
* @returns VBox status code.
* @param pSession The caller's session.
* @param u64Arg 64-bit integer argument.
* @param pReqHdr The request header. Input / Output. Optional.
*/
DECLEXPORT(int) TSTR0ThreadPreemptionSrvReqHandler(PSUPDRVSESSION pSession, uint32_t uOperation,
uint64_t u64Arg, PSUPR0SERVICEREQHDR pReqHdr)
{
NOREF(pSession);
if (u64Arg)
return VERR_INVALID_PARAMETER;
if (!VALID_PTR(pReqHdr))
return VERR_INVALID_PARAMETER;
char *pszErr = (char *)(pReqHdr + 1);
size_t cchErr = pReqHdr->cbReq - sizeof(*pReqHdr);
if (cchErr < 32 || cchErr >= 0x10000)
return VERR_INVALID_PARAMETER;
*pszErr = '\0';
/*
* The big switch.
*/
switch (uOperation)
{
case TSTR0THREADPREMEPTION_SANITY_OK:
break;
case TSTR0THREADPREMEPTION_SANITY_FAILURE:
RTStrPrintf(pszErr, cchErr, "!42failure42%1024s", "");
break;
case TSTR0THREADPREMEPTION_BASIC:
{
if (!ASMIntAreEnabled())
RTStrPrintf(pszErr, cchErr, "!Interrupts disabled");
else if (!RTThreadPreemptIsEnabled(NIL_RTTHREAD))
RTStrPrintf(pszErr, cchErr, "!RTThreadPreemptIsEnabled returns false by default");
else
{
RTTHREADPREEMPTSTATE State = RTTHREADPREEMPTSTATE_INITIALIZER;
RTThreadPreemptDisable(&State);
if (RTThreadPreemptIsEnabled(NIL_RTTHREAD))
RTStrPrintf(pszErr, cchErr, "!RTThreadPreemptIsEnabled returns true after RTThreadPreemptDisable");
else if (!ASMIntAreEnabled())
RTStrPrintf(pszErr, cchErr, "!Interrupts disabled");
RTThreadPreemptRestore(&State);
}
break;
}
case TSTR0THREADPREMEPTION_IS_PENDING:
{
RTTHREADPREEMPTSTATE State = RTTHREADPREEMPTSTATE_INITIALIZER;
RTThreadPreemptDisable(&State);
if (!RTThreadPreemptIsEnabled(NIL_RTTHREAD))
{
if (ASMIntAreEnabled())
{
uint64_t u64StartTS = RTTimeNanoTS();
uint64_t u64StartSysTS = RTTimeSystemNanoTS();
uint64_t cLoops = 0;
uint64_t cNanosSysElapsed;
uint64_t cNanosElapsed;
bool fPending;
do
{
fPending = RTThreadPreemptIsPending(NIL_RTTHREAD);
cNanosElapsed = RTTimeNanoTS() - u64StartTS;
cNanosSysElapsed = RTTimeSystemNanoTS() - u64StartSysTS;
cLoops++;
} while ( !fPending
&& cNanosElapsed < UINT64_C(2)*1000U*1000U*1000U
&& cNanosSysElapsed < UINT64_C(2)*1000U*1000U*1000U
&& cLoops < 100U*_1M);
if (!fPending)
RTStrPrintf(pszErr, cchErr, "!Preempt not pending after %'llu loops / %'llu ns / %'llu ns (sys)",
cLoops, cNanosElapsed, cNanosSysElapsed);
else if (cLoops == 1)
RTStrPrintf(pszErr, cchErr, "!cLoops=1\n");
else
RTStrPrintf(pszErr, cchErr, "RTThreadPreemptIsPending returned true after %'llu loops / %'llu ns / %'llu ns (sys)",
cLoops, cNanosElapsed, cNanosSysElapsed);
}
else
RTStrPrintf(pszErr, cchErr, "!Interrupts disabled");
}
else
RTStrPrintf(pszErr, cchErr, "!RTThreadPreemptIsEnabled returns true after RTThreadPreemptDisable");
RTThreadPreemptRestore(&State);
break;
}
case TSTR0THREADPREMEPTION_NESTED:
{
bool const fDefault = RTThreadPreemptIsEnabled(NIL_RTTHREAD);
RTTHREADPREEMPTSTATE State1 = RTTHREADPREEMPTSTATE_INITIALIZER;
RTThreadPreemptDisable(&State1);
if (!RTThreadPreemptIsEnabled(NIL_RTTHREAD))
{
RTTHREADPREEMPTSTATE State2 = RTTHREADPREEMPTSTATE_INITIALIZER;
RTThreadPreemptDisable(&State2);
if (!RTThreadPreemptIsEnabled(NIL_RTTHREAD))
{
RTTHREADPREEMPTSTATE State3 = RTTHREADPREEMPTSTATE_INITIALIZER;
RTThreadPreemptDisable(&State3);
if (RTThreadPreemptIsEnabled(NIL_RTTHREAD))
RTStrPrintf(pszErr, cchErr, "!RTThreadPreemptIsEnabled returns true after 3rd RTThreadPreemptDisable");
RTThreadPreemptRestore(&State3);
if (RTThreadPreemptIsEnabled(NIL_RTTHREAD) && !*pszErr)
RTStrPrintf(pszErr, cchErr, "!RTThreadPreemptIsEnabled returns true after 1st RTThreadPreemptRestore");
}
else
RTStrPrintf(pszErr, cchErr, "!RTThreadPreemptIsEnabled returns true after 2nd RTThreadPreemptDisable");
RTThreadPreemptRestore(&State2);
if (RTThreadPreemptIsEnabled(NIL_RTTHREAD) && !*pszErr)
RTStrPrintf(pszErr, cchErr, "!RTThreadPreemptIsEnabled returns true after 2nd RTThreadPreemptRestore");
}
else
RTStrPrintf(pszErr, cchErr, "!RTThreadPreemptIsEnabled returns true after 1st RTThreadPreemptDisable");
RTThreadPreemptRestore(&State1);
if (RTThreadPreemptIsEnabled(NIL_RTTHREAD) != fDefault && !*pszErr)
RTStrPrintf(pszErr, cchErr, "!RTThreadPreemptIsEnabled returns false after 3rd RTThreadPreemptRestore");
break;
}
default:
RTStrPrintf(pszErr, cchErr, "!Unknown test #%d", uOperation);
break;
}
/* The error indicator is the '!' in the message buffer. */
return VINF_SUCCESS;
}
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