diff options
Diffstat (limited to 'src/VBox/Runtime/testcase/tstRTR0ThreadPreemption.cpp')
| -rw-r--r-- | src/VBox/Runtime/testcase/tstRTR0ThreadPreemption.cpp | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/src/VBox/Runtime/testcase/tstRTR0ThreadPreemption.cpp b/src/VBox/Runtime/testcase/tstRTR0ThreadPreemption.cpp new file mode 100644 index 00000000..3dfc9154 --- /dev/null +++ b/src/VBox/Runtime/testcase/tstRTR0ThreadPreemption.cpp @@ -0,0 +1,463 @@ +/* $Id: tstRTR0ThreadPreemption.cpp $ */ +/** @file + * IPRT R0 Testcase - Thread Preemption. + */ + +/* + * Copyright (C) 2009-2020 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/errcore.h> +#include <iprt/mem.h> +#include <iprt/time.h> +#include <iprt/string.h> +#include <VBox/sup.h> +#include "tstRTR0ThreadPreemption.h" + + +#define TSTRTR0THREADCTXDATA_MAGIC 0xc01a50da + +/** + * Thread-context hook data. + */ +typedef struct TSTRTR0THREADCTXDATA +{ + uint32_t volatile u32Magic; + RTCPUID uSourceCpuId; + RTNATIVETHREAD hSourceThread; + + /* For RTTHREADCTXEVENT_PREEMPTING. */ + bool fPreemptingSuccess; + volatile bool fPreemptingInvoked; + + /* For RTTHREADCTXEVENT_RESUMED. */ + bool fResumedSuccess; + volatile bool fResumedInvoked; + + char achResult[512]; +} TSTRTR0THREADCTXDATA, *PTSTRTR0THREADCTXDATA; + + +/** + * Thread-context hook function. + * + * @param enmEvent The thread-context event. + * @param pvUser Pointer to the user argument. + */ +static DECLCALLBACK(void) tstRTR0ThreadCtxHook(RTTHREADCTXEVENT enmEvent, void *pvUser) +{ + PTSTRTR0THREADCTXDATA pData = (PTSTRTR0THREADCTXDATA)pvUser; + AssertPtrReturnVoid(pData); + + if (pData->u32Magic != TSTRTR0THREADCTXDATA_MAGIC) + { + RTStrPrintf(pData->achResult, sizeof(pData->achResult), "!tstRTR0ThreadCtxHook: Invalid magic."); + return; + } + + switch (enmEvent) + { + case RTTHREADCTXEVENT_OUT: + { + ASMAtomicWriteBool(&pData->fPreemptingInvoked, true); + + /* We've already been called once, we now might very well be on another CPU. Nothing to do here. */ + if (pData->fPreemptingSuccess) + return; + + if (RTThreadPreemptIsEnabled(NIL_RTTHREAD)) + { + RTStrPrintf(pData->achResult, sizeof(pData->achResult), + "!tstRTR0ThreadCtxHook[RTTHREADCTXEVENT_PREEMPTING]: Called with preemption enabled"); + break; + } + + RTNATIVETHREAD hCurrentThread = RTThreadNativeSelf(); + if (pData->hSourceThread != hCurrentThread) + { + RTStrPrintf(pData->achResult, sizeof(pData->achResult), + "!tstRTR0ThreadCtxHook[RTTHREADCTXEVENT_PREEMPTING]: Thread switched! Source=%RTnthrd Current=%RTnthrd.", + pData->hSourceThread, hCurrentThread); + break; + } + + RTCPUID uCurrentCpuId = RTMpCpuId(); + if (pData->uSourceCpuId != uCurrentCpuId) + { + RTStrPrintf(pData->achResult, sizeof(pData->achResult), + "!tstRTR0ThreadCtxHook[RTTHREADCTXEVENT_PREEMPTING]: migrated uSourceCpuId=%RU32 uCurrentCpuId=%RU32", + pData->uSourceCpuId, uCurrentCpuId); + break; + } + + pData->fPreemptingSuccess = true; + break; + } + + case RTTHREADCTXEVENT_IN: + { + ASMAtomicWriteBool(&pData->fResumedInvoked, true); + + /* We've already been called once successfully, nothing more to do. */ + if (ASMAtomicReadBool(&pData->fResumedSuccess)) + return; + + if (!pData->fPreemptingSuccess) + { + RTStrPrintf(pData->achResult, sizeof(pData->achResult), + "!tstRTR0ThreadCtxHook[RTTHREADCTXEVENT_RESUMED]: Called before preempting callback was invoked."); + break; + } + + RTNATIVETHREAD hCurrentThread = RTThreadNativeSelf(); + if (pData->hSourceThread != hCurrentThread) + { + RTStrPrintf(pData->achResult, sizeof(pData->achResult), + "!tstRTR0ThreadCtxHook[RTTHREADCTXEVENT_RESUMED]: Thread switched! Source=%RTnthrd Current=%RTnthrd.", + pData->hSourceThread, hCurrentThread); + break; + } + + ASMAtomicWriteBool(&pData->fResumedSuccess, true); + break; + } + + default: + AssertMsgFailed(("Invalid event %#x\n", enmEvent)); + break; + } +} + + +/** + * 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) TSTRTR0ThreadPreemptionSrvReqHandler(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 TSTRTR0THREADPREEMPTION_SANITY_OK: + break; + + case TSTRTR0THREADPREEMPTION_SANITY_FAILURE: + RTStrPrintf(pszErr, cchErr, "!42failure42%1024s", ""); + break; + + case TSTRTR0THREADPREEMPTION_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 TSTRTR0THREADPREEMPTION_IS_TRUSTY: + if (!RTThreadPreemptIsPendingTrusty()) + RTStrPrintf(pszErr, cchErr, "!Untrusty"); + break; + + case TSTRTR0THREADPREEMPTION_IS_PENDING: + { + RTTHREADPREEMPTSTATE State = RTTHREADPREEMPTSTATE_INITIALIZER; + RTThreadPreemptDisable(&State); + if (!RTThreadPreemptIsEnabled(NIL_RTTHREAD)) + { +#ifdef RT_OS_DARWIN + uint64_t const cNsMax = UINT64_C(8)*1000U*1000U*1000U; +#else + uint64_t const cNsMax = UINT64_C(2)*1000U*1000U*1000U; +#endif + 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 < cNsMax + && cNanosSysElapsed < cNsMax + && 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 TSTRTR0THREADPREEMPTION_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; + } + + case TSTRTR0THREADPREEMPTION_CTXHOOKS: + { + if (!RTThreadPreemptIsEnabled(NIL_RTTHREAD)) + { + RTStrPrintf(pszErr, cchErr, "!RTThreadCtxHooksCreate must be called with preemption enabled"); + break; + } + + bool fRegistered = RTThreadCtxHookIsEnabled(NIL_RTTHREADCTXHOOK); + if (fRegistered) + { + RTStrPrintf(pszErr, cchErr, "!RTThreadCtxHookIsEnabled returns true before creating any hooks"); + break; + } + + PTSTRTR0THREADCTXDATA pCtxData = (PTSTRTR0THREADCTXDATA)RTMemAllocZ(sizeof(*pCtxData)); + AssertReturn(pCtxData, VERR_NO_MEMORY); + pCtxData->u32Magic = TSTRTR0THREADCTXDATA_MAGIC; + pCtxData->fPreemptingSuccess = false; + pCtxData->fPreemptingInvoked = false; + pCtxData->fResumedInvoked = false; + pCtxData->fResumedSuccess = false; + pCtxData->hSourceThread = RTThreadNativeSelf(); + RT_ZERO(pCtxData->achResult); + + RTTHREADCTXHOOK hThreadCtx; + int rc = RTThreadCtxHookCreate(&hThreadCtx, 0, tstRTR0ThreadCtxHook, pCtxData); + if (RT_FAILURE(rc)) + { + if (rc == VERR_NOT_SUPPORTED) + RTStrPrintf(pszErr, cchErr, "RTThreadCtxHooksCreate returns VERR_NOT_SUPPORTED"); + else + RTStrPrintf(pszErr, cchErr, "!RTThreadCtxHooksCreate returns %Rrc", rc); + RTMemFree(pCtxData); + break; + } + + fRegistered = RTThreadCtxHookIsEnabled(hThreadCtx); + if (fRegistered) + { + RTStrPrintf(pszErr, cchErr, "!RTThreadCtxHookIsEnabled returns true before registering any hooks"); + RTThreadCtxHookDestroy(hThreadCtx); + break; + } + + RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER; + RTThreadPreemptDisable(&PreemptState); + Assert(!RTThreadPreemptIsEnabled(NIL_RTTHREAD)); + + pCtxData->uSourceCpuId = RTMpCpuId(); + + rc = RTThreadCtxHookEnable(hThreadCtx); + if (RT_FAILURE(rc)) + { + RTThreadPreemptRestore(&PreemptState); + RTMemFree(pCtxData); + RTStrPrintf(pszErr, cchErr, "!RTThreadCtxHookEnable returns %Rrc", rc); + break; + } + + fRegistered = RTThreadCtxHookIsEnabled(hThreadCtx); + if (!fRegistered) + { + RTThreadPreemptRestore(&PreemptState); + RTThreadCtxHookDestroy(hThreadCtx); + RTMemFree(pCtxData); + RTStrPrintf(pszErr, cchErr, "!RTThreadCtxHookIsEnabled return false when hooks are supposed to be enabled"); + break; + } + + RTThreadPreemptRestore(&PreemptState); + + /* Check if the preempting callback has/will been invoked. */ + const uint32_t cMsTimeout = 10000; + const uint32_t cMsSleepGranularity = 50; + uint32_t cMsSlept = 0; + RTCPUID uCurrentCpuId = NIL_RTCPUID; + for (;;) + { + RTThreadYield(); + RTThreadPreemptDisable(&PreemptState); + uCurrentCpuId = RTMpCpuId(); + RTThreadPreemptRestore(&PreemptState); + + if ( pCtxData->uSourceCpuId != uCurrentCpuId + || cMsSlept >= cMsTimeout) + { + break; + } + + RTThreadSleep(cMsSleepGranularity); + cMsSlept += cMsSleepGranularity; + } + + if (!ASMAtomicReadBool(&pCtxData->fPreemptingInvoked)) + { + if (pCtxData->uSourceCpuId != uCurrentCpuId) + { + RTStrPrintf(pszErr, cchErr, + "!tstRTR0ThreadCtxHooks[RTTHREADCTXEVENT_OUT] not invoked before migrating from CPU %RU32 to %RU32", + pCtxData->uSourceCpuId, uCurrentCpuId); + } + else + { + RTStrPrintf(pszErr, cchErr, "!tstRTR0ThreadCtxHooks[RTTHREADCTXEVENT_OUT] not invoked after ca. %u ms", + cMsSlept); + } + } + else if (!pCtxData->fPreemptingSuccess) + RTStrCopy(pszErr, cchErr, pCtxData->achResult); + else + { + /* Preempting callback succeeded, now check if the resumed callback has/will been invoked. */ + cMsSlept = 0; + for (;;) + { + if ( ASMAtomicReadBool(&pCtxData->fResumedInvoked) + || cMsSlept >= cMsTimeout) + { + break; + } + + RTThreadSleep(cMsSleepGranularity); + cMsSlept += cMsSleepGranularity; + } + + if (!ASMAtomicReadBool(&pCtxData->fResumedInvoked)) + { + RTStrPrintf(pszErr, cchErr, "!tstRTR0ThreadCtxHooks[RTTHREADCTXEVENT_IN] not invoked after ca. %u ms", + cMsSlept); + } + else if (!pCtxData->fResumedSuccess) + RTStrCopy(pszErr, cchErr, pCtxData->achResult); + } + + rc = RTThreadCtxHookDisable(hThreadCtx); + if (RT_SUCCESS(rc)) + { + fRegistered = RTThreadCtxHookIsEnabled(hThreadCtx); + if (fRegistered) + { + RTThreadCtxHookDestroy(hThreadCtx); + RTMemFree(pCtxData); + RTStrPrintf(pszErr, cchErr, "!RTThreadCtxHookIsEnabled return true when hooks are disabled"); + break; + } + } + else + RTStrPrintf(pszErr, cchErr, "!RTThreadCtxHookDisable failed, returns %Rrc!", rc); + + Assert(RTThreadPreemptIsEnabled(NIL_RTTHREAD)); + rc = RTThreadCtxHookDestroy(hThreadCtx); + if (RT_FAILURE(rc)) + RTStrPrintf(pszErr, cchErr, "!RTThreadCtxHooksRelease returns %Rrc!", rc); + + RTMemFree(pCtxData); + break; + } + + default: + RTStrPrintf(pszErr, cchErr, "!Unknown test #%d", uOperation); + break; + } + + /* The error indicator is the '!' in the message buffer. */ + return VINF_SUCCESS; +} + |