C++ NS_IsMainThread函数代码示例

  void OnError(BluetoothStatus aStatus) override
  {
    MOZ_ASSERT(NS_IsMainThread());

    mRes->OnError(aStatus);
  }

void
CDMProxy::Shutdown()
{
  MOZ_ASSERT(NS_IsMainThread());
  mKeys.Clear();
}

double HTMLVideoElement::MozFrameDelay()
{
  MOZ_ASSERT(NS_IsMainThread(), "Should be on main thread.");
  VideoFrameContainer* container = GetVideoFrameContainer();
  return container ?  container->GetFrameDelay() : 0;
}

CompositorThreadHolder::CompositorThreadHolder()
  : mCompositorThread(CreateCompositorThread())
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_COUNT_CTOR(CompositorThreadHolder);
}

    static ObjectType* GetInstance()
    {
      MOZ_ASSERT(NS_IsMainThread());

      return sA2dpNotificationHandler;
    }

// https://html.spec.whatwg.org/multipage/embedded-content.html#time-marches-on
void
TextTrackManager::TimeMarchesOn()
{
  NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");

  mTimeMarchesOnDispatched = false;

  // Early return if we don't have any TextTracks.
  if (mTextTracks->Length() == 0) {
    return;
  }

  nsISupports* parentObject =
    mMediaElement->OwnerDoc()->GetParentObject();
  if (NS_WARN_IF(!parentObject)) {
    return;
  }
  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(parentObject);

  if (mMediaElement &&
      (!(mMediaElement->GetPlayedOrSeeked()) || mMediaElement->Seeking())) {
    return;
  }

  // Step 3.
  double currentPlaybackTime = mMediaElement->CurrentTime();
  bool hasNormalPlayback = !mHasSeeked;
  mHasSeeked = false;

  // Step 1, 2.
  RefPtr<TextTrackCueList> currentCues =
    new TextTrackCueList(window);
  RefPtr<TextTrackCueList> otherCues =
    new TextTrackCueList(window);
  bool dummy;
  for (uint32_t index = 0; index < mTextTracks->Length(); ++index) {
    TextTrack* ttrack = mTextTracks->IndexedGetter(index, dummy);
    if (ttrack && dummy) {
      // TODO: call GetCueListByTimeInterval on mNewCues?
      TextTrackCueList* activeCueList = ttrack->GetActiveCues();
      if (activeCueList) {
        for (uint32_t i = 0; i < activeCueList->Length(); ++i) {
          currentCues->AddCue(*((*activeCueList)[i]));
        }
      }
    }
  }
  // Populate otherCues with 'non-active" cues.
  if (hasNormalPlayback) {
    if (currentPlaybackTime < mLastTimeMarchesOnCalled) {
      // TODO: Add log and find the root cause why the
      // playback position goes backward.
      mLastTimeMarchesOnCalled = currentPlaybackTime;
    }
    media::Interval<double> interval(mLastTimeMarchesOnCalled,
                                     currentPlaybackTime);
    otherCues = mNewCues->GetCueListByTimeInterval(interval);;
  } else {
    // Seek case. Put the mLastActiveCues into otherCues.
    otherCues = mLastActiveCues;
  }
  for (uint32_t i = 0; i < currentCues->Length(); ++i) {
    TextTrackCue* cue = (*currentCues)[i];
    otherCues->RemoveCue(*cue);
  }

  // Step 4.
  RefPtr<TextTrackCueList> missedCues = new TextTrackCueList(window);
  if (hasNormalPlayback) {
    for (uint32_t i = 0; i < otherCues->Length(); ++i) {
      TextTrackCue* cue = (*otherCues)[i];
      if (cue->StartTime() >= mLastTimeMarchesOnCalled &&
          cue->EndTime() <= currentPlaybackTime) {
        missedCues->AddCue(*cue);
      }
    }
  }

  // Step 5. Empty now.
  // TODO: Step 6: fire timeupdate?

  // Step 7. Abort steps if condition 1, 2, 3 are satisfied.
  // 1. All of the cues in current cues have their active flag set.
  // 2. None of the cues in other cues have their active flag set.
  // 3. Missed cues is empty.
  bool c1 = true;
  for (uint32_t i = 0; i < currentCues->Length(); ++i) {
    if (!(*currentCues)[i]->GetActive()) {
      c1 = false;
      break;
    }
  }
  bool c2 = true;
  for (uint32_t i = 0; i < otherCues->Length(); ++i) {
    if ((*otherCues)[i]->GetActive()) {
      c2 = false;
      break;
    }
  }
//.........这里部分代码省略.........

already_AddRefed<IDBOpenDBRequest>
IDBFactory::OpenInternal(nsIPrincipal* aPrincipal,
                         const nsAString& aName,
                         const Optional<uint64_t>& aVersion,
                         const Optional<StorageType>& aStorageType,
                         bool aDeleting,
                         ErrorResult& aRv)
{
  MOZ_ASSERT(mWindow || mOwningObject);
  MOZ_ASSERT_IF(!mWindow, !mPrivateBrowsingMode);

  CommonFactoryRequestParams commonParams;
  commonParams.privateBrowsingMode() = mPrivateBrowsingMode;

  PrincipalInfo& principalInfo = commonParams.principalInfo();

  if (aPrincipal) {
    if (!NS_IsMainThread()) {
      MOZ_CRASH("Figure out security checks for workers!");
    }
    MOZ_ASSERT(nsContentUtils::IsCallerChrome());

    if (NS_WARN_IF(NS_FAILED(PrincipalToPrincipalInfo(aPrincipal,
                                                      &principalInfo)))) {
      IDB_REPORT_INTERNAL_ERR();
      aRv.Throw(NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
      return nullptr;
    }

    if (principalInfo.type() != PrincipalInfo::TContentPrincipalInfo &&
        principalInfo.type() != PrincipalInfo::TSystemPrincipalInfo) {
      IDB_REPORT_INTERNAL_ERR();
      aRv.Throw(NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
      return nullptr;
    }
  } else {
    principalInfo = *mPrincipalInfo;
  }

  uint64_t version = 0;
  if (!aDeleting && aVersion.WasPassed()) {
    if (aVersion.Value() < 1) {
      aRv.ThrowTypeError(MSG_INVALID_VERSION);
      return nullptr;
    }
    version = aVersion.Value();
  }

  // Nothing can be done here if we have previously failed to create a
  // background actor.
  if (mBackgroundActorFailed) {
    IDB_REPORT_INTERNAL_ERR();
    aRv.Throw(NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
    return nullptr;
  }

  PersistenceType persistenceType;

  if (principalInfo.type() == PrincipalInfo::TSystemPrincipalInfo) {
    // Chrome privilege always gets persistent storage.
    persistenceType = PERSISTENCE_TYPE_PERSISTENT;
  } else {
    persistenceType = PersistenceTypeFromStorage(aStorageType);
  }

  DatabaseMetadata& metadata = commonParams.metadata();
  metadata.name() = aName;
  metadata.persistenceType() = persistenceType;

  FactoryRequestParams params;
  if (aDeleting) {
    metadata.version() = 0;
    params = DeleteDatabaseRequestParams(commonParams);
  } else {
    metadata.version() = version;
    params = OpenDatabaseRequestParams(commonParams);
  }

  if (!mBackgroundActor && mPendingRequests.IsEmpty()) {
    // We need to start the sequence to create a background actor for this
    // thread.
    BackgroundChildImpl::ThreadLocal* threadLocal =
      BackgroundChildImpl::GetThreadLocalForCurrentThread();

    nsAutoPtr<ThreadLocal> newIDBThreadLocal;
    ThreadLocal* idbThreadLocal;

    if (threadLocal && threadLocal->mIndexedDBThreadLocal) {
      idbThreadLocal = threadLocal->mIndexedDBThreadLocal;
    } else {
      nsCOMPtr<nsIUUIDGenerator> uuidGen =
        do_GetService("@mozilla.org/uuid-generator;1");
      MOZ_ASSERT(uuidGen);

      nsID id;
      MOZ_ALWAYS_TRUE(NS_SUCCEEDED(uuidGen->GenerateUUIDInPlace(&id)));

      newIDBThreadLocal = idbThreadLocal = new ThreadLocal(id);
    }

//.........这里部分代码省略.........

void
MediaDecodeTask::Decode()
{
  MOZ_ASSERT(!mThreadPool == NS_IsMainThread(),
             "We should be on the main thread only if we don't have a thread pool");

  mBufferDecoder->BeginDecoding(NS_GetCurrentThread());

  // Tell the decoder reader that we are not going to play the data directly,
  // and that we should not reject files with more channels than the audio
  // bakend support.
  mDecoderReader->SetIgnoreAudioOutputFormat();

  mDecoderReader->OnDecodeThreadStart();

  MediaInfo mediaInfo;
  nsAutoPtr<MetadataTags> tags;
  nsresult rv = mDecoderReader->ReadMetadata(&mediaInfo, getter_Transfers(tags));
  if (NS_FAILED(rv)) {
    ReportFailureOnMainThread(WebAudioDecodeJob::InvalidContent);
    return;
  }

  if (!mDecoderReader->HasAudio()) {
    ReportFailureOnMainThread(WebAudioDecodeJob::NoAudio);
    return;
  }

  while (mDecoderReader->DecodeAudioData()) {
    // consume all of the buffer
    continue;
  }

  mDecoderReader->OnDecodeThreadFinish();

  MediaQueue<AudioData>& audioQueue = mDecoderReader->AudioQueue();
  uint32_t frameCount = audioQueue.FrameCount();
  uint32_t channelCount = mediaInfo.mAudio.mChannels;
  uint32_t sampleRate = mediaInfo.mAudio.mRate;

  if (!frameCount || !channelCount || !sampleRate) {
    ReportFailureOnMainThread(WebAudioDecodeJob::InvalidContent);
    return;
  }

  const uint32_t destSampleRate = mDecodeJob.mContext->SampleRate();
  AutoResampler resampler;

  uint32_t resampledFrames = frameCount;
  if (sampleRate != destSampleRate) {
    resampledFrames = static_cast<uint32_t>(
        static_cast<uint64_t>(destSampleRate) *
        static_cast<uint64_t>(frameCount) /
        static_cast<uint64_t>(sampleRate)
      );

    resampler = speex_resampler_init(channelCount,
                                     sampleRate,
                                     destSampleRate,
                                     SPEEX_RESAMPLER_QUALITY_DEFAULT, nullptr);
    speex_resampler_skip_zeros(resampler);
    resampledFrames += speex_resampler_get_output_latency(resampler);
  }

  // Allocate the channel buffers.  Note that if we end up resampling, we may
  // write fewer bytes than mResampledFrames to the output buffer, in which
  // case mWriteIndex will tell us how many valid samples we have.
  static const fallible_t fallible = fallible_t();
  bool memoryAllocationSuccess = true;
  if (!mDecodeJob.mChannelBuffers.SetLength(channelCount)) {
    memoryAllocationSuccess = false;
  } else {
    for (uint32_t i = 0; i < channelCount; ++i) {
      mDecodeJob.mChannelBuffers[i] = new(fallible) float[resampledFrames];
      if (!mDecodeJob.mChannelBuffers[i]) {
        memoryAllocationSuccess = false;
        break;
      }
    }
  }
  if (!memoryAllocationSuccess) {
    ReportFailureOnMainThread(WebAudioDecodeJob::UnknownError);
    return;
  }

  nsAutoPtr<AudioData> audioData;
  while ((audioData = audioQueue.PopFront())) {
    audioData->EnsureAudioBuffer(); // could lead to a copy :(
    AudioDataValue* bufferData = static_cast<AudioDataValue*>
      (audioData->mAudioBuffer->Data());

    if (sampleRate != destSampleRate) {
      const uint32_t maxOutSamples = resampledFrames - mDecodeJob.mWriteIndex;

      for (uint32_t i = 0; i < audioData->mChannels; ++i) {
        uint32_t inSamples = audioData->mFrames;
        uint32_t outSamples = maxOutSamples;

        WebAudioUtils::SpeexResamplerProcess(
            resampler, i, &bufferData[i * audioData->mFrames], &inSamples,
//.........这里部分代码省略.........

  void RegisterModule() override
  {
    MOZ_ASSERT(NS_IsMainThread());

    mRes->Init();
  }

 NS_IMETHOD Run() {
   NS_ASSERTION(NS_IsMainThread(), "Must be on main thread.");
   mDXVA2Manager = DXVA2Manager::Create();
   return NS_OK;
 }

OSFileConstantsService::OSFileConstantsService()
{
  MOZ_ASSERT(NS_IsMainThread());
}

/**
 * Perform the part of initialization that can only be
 * executed on the main thread.
 */
nsresult InitOSFileConstants()
{
  MOZ_ASSERT(NS_IsMainThread());
  if (gInitialized) {
    return NS_OK;
  }

  gInitialized = true;

  nsAutoPtr<Paths> paths(new Paths);

  // Initialize paths->libDir
  nsCOMPtr<nsIFile> file;
  nsresult rv = NS_GetSpecialDirectory(NS_XPCOM_LIBRARY_FILE, getter_AddRefs(file));
  if (NS_FAILED(rv)) {
    return rv;
  }

  nsCOMPtr<nsIFile> libDir;
  rv = file->GetParent(getter_AddRefs(libDir));
  if (NS_FAILED(rv)) {
    return rv;
  }

  rv = libDir->GetPath(paths->libDir);
  if (NS_FAILED(rv)) {
    return rv;
  }

  // Setup profileDir and localProfileDir immediately if possible (we
  // assume that NS_APP_USER_PROFILE_50_DIR and
  // NS_APP_USER_PROFILE_LOCAL_50_DIR are set simultaneously)
  rv = GetPathToSpecialDir(NS_APP_USER_PROFILE_50_DIR, paths->profileDir);
  if (NS_SUCCEEDED(rv)) {
    rv = GetPathToSpecialDir(NS_APP_USER_PROFILE_LOCAL_50_DIR, paths->localProfileDir);
  }

  // Otherwise, delay setup of profileDir/localProfileDir until they
  // become available.
  if (NS_FAILED(rv)) {
    nsCOMPtr<nsIObserverService> obsService = do_GetService(NS_OBSERVERSERVICE_CONTRACTID, &rv);
    if (NS_FAILED(rv)) {
      return rv;
    }
    RefPtr<DelayedPathSetter> pathSetter = new DelayedPathSetter();
    rv = obsService->AddObserver(pathSetter, "profile-do-change", false);
    if (NS_FAILED(rv)) {
      return rv;
    }
  }

  // For other directories, ignore errors (they may be undefined on
  // some platforms or in non-Firefox embeddings of Gecko).

  GetPathToSpecialDir(NS_OS_TEMP_DIR, paths->tmpDir);
  GetPathToSpecialDir(NS_OS_HOME_DIR, paths->homeDir);
  GetPathToSpecialDir(NS_OS_DESKTOP_DIR, paths->desktopDir);
  GetPathToSpecialDir(XRE_USER_APP_DATA_DIR, paths->userApplicationDataDir);

#if defined(XP_WIN)
  GetPathToSpecialDir(NS_WIN_APPDATA_DIR, paths->winAppDataDir);
  GetPathToSpecialDir(NS_WIN_PROGRAMS_DIR, paths->winStartMenuProgsDir);
#endif // defined(XP_WIN)

#if defined(XP_MACOSX)
  GetPathToSpecialDir(NS_MAC_USER_LIB_DIR, paths->macUserLibDir);
  GetPathToSpecialDir(NS_OSX_LOCAL_APPLICATIONS_DIR, paths->macLocalApplicationsDir);
  GetPathToSpecialDir(NS_MAC_TRASH_DIR, paths->macTrashDir);
#endif // defined(XP_MACOSX)

  gPaths = paths.forget();

  // Get the umask from the system-info service.
  // The property will always be present, but it will be zero on
  // non-Unix systems.
  nsCOMPtr<nsIPropertyBag2> infoService =
    do_GetService("@mozilla.org/system-info;1");
  MOZ_ASSERT(infoService, "Could not access the system information service");
  rv = infoService->GetPropertyAsUint32(NS_LITERAL_STRING("umask"),
                                        &gUserUmask);
  if (NS_FAILED(rv)) {
    return rv;
  }

  return NS_OK;
}

AbstractThread*
DocGroup::AbstractMainThreadFor(TaskCategory aCategory)
{
  MOZ_RELEASE_ASSERT(NS_IsMainThread());
  return mTabGroup->AbstractMainThreadFor(aCategory);
}

CallbackObject::CallSetup::CallSetup(CallbackObject* aCallback,
                                     ErrorResult& aRv,
                                     const char* aExecutionReason,
                                     ExceptionHandling aExceptionHandling,
                                     JSCompartment* aCompartment,
                                     bool aIsJSImplementedWebIDL)
  : mCx(nullptr)
  , mCompartment(aCompartment)
  , mErrorResult(aRv)
  , mExceptionHandling(aExceptionHandling)
  , mIsMainThread(NS_IsMainThread())
{
  if (mIsMainThread) {
    nsContentUtils::EnterMicroTask();
  }

  // Compute the caller's subject principal (if necessary) early, before we
  // do anything that might perturb the relevant state.
  nsIPrincipal* webIDLCallerPrincipal = nullptr;
  if (aIsJSImplementedWebIDL) {
    webIDLCallerPrincipal = nsContentUtils::SubjectPrincipalOrSystemIfNativeCaller();
  }

  // First, find the real underlying callback.
  JSObject* realCallback = js::UncheckedUnwrap(aCallback->CallbackPreserveColor());
  nsIGlobalObject* globalObject = nullptr;

  JSContext* cx;
  {
    // Bug 955660: we cannot do "proper" rooting here because we need the
    // global to get a context. Everything here is simple getters that cannot
    // GC, so just paper over the necessary dataflow inversion.
    JS::AutoSuppressGCAnalysis nogc;

    // Now get the global for this callback. Note that for the case of
    // JS-implemented WebIDL we never have a window here.
    nsGlobalWindow* win = mIsMainThread && !aIsJSImplementedWebIDL
                        ? xpc::WindowGlobalOrNull(realCallback)
                        : nullptr;
    if (win) {
      MOZ_ASSERT(win->IsInnerWindow());
      // We don't want to run script in windows that have been navigated away
      // from.
      if (!win->AsInner()->HasActiveDocument()) {
        aRv.ThrowDOMException(NS_ERROR_DOM_NOT_SUPPORTED_ERR,
          NS_LITERAL_CSTRING("Refusing to execute function from window "
                             "whose document is no longer active."));
        return;
      }
      globalObject = win;
    } else {
      // No DOM Window. Store the global.
      JSObject* global = js::GetGlobalForObjectCrossCompartment(realCallback);
      globalObject = xpc::NativeGlobal(global);
      MOZ_ASSERT(globalObject);
    }

    // Bail out if there's no useful global. This seems to happen intermittently
    // on gaia-ui tests, probably because nsInProcessTabChildGlobal is returning
    // null in some kind of teardown state.
    if (!globalObject->GetGlobalJSObject()) {
      aRv.ThrowDOMException(NS_ERROR_DOM_NOT_SUPPORTED_ERR,
        NS_LITERAL_CSTRING("Refusing to execute function from global which is "
                           "being torn down."));
      return;
    }

    mAutoEntryScript.emplace(globalObject, aExecutionReason, mIsMainThread);
    mAutoEntryScript->SetWebIDLCallerPrincipal(webIDLCallerPrincipal);
    nsIGlobalObject* incumbent = aCallback->IncumbentGlobalOrNull();
    if (incumbent) {
      // The callback object traces its incumbent JS global, so in general it
      // should be alive here. However, it's possible that we could run afoul
      // of the same IPC global weirdness described above, wherein the
      // nsIGlobalObject has severed its reference to the JS global. Let's just
      // be safe here, so that nobody has to waste a day debugging gaia-ui tests.
      if (!incumbent->GetGlobalJSObject()) {
      aRv.ThrowDOMException(NS_ERROR_DOM_NOT_SUPPORTED_ERR,
        NS_LITERAL_CSTRING("Refusing to execute function because our "
                           "incumbent global is being torn down."));
        return;
      }
      mAutoIncumbentScript.emplace(incumbent);
    }

    cx = mAutoEntryScript->cx();

    // Unmark the callable (by invoking Callback() and not the CallbackPreserveColor()
    // variant), and stick it in a Rooted before it can go gray again.
    // Nothing before us in this function can trigger a CC, so it's safe to wait
    // until here it do the unmark. This allows us to construct mRootedCallable
    // with the cx from mAutoEntryScript, avoiding the cost of finding another
    // JSContext. (Rooted<> does not care about requests or compartments.)
    mRootedCallable.emplace(cx, aCallback->Callback());
  }

  // JS-implemented WebIDL is always OK to run, since it runs with Chrome
  // privileges anyway.
  if (mIsMainThread && !aIsJSImplementedWebIDL) {
    // Check that it's ok to run this callback at all.
//.........这里部分代码省略.........

nsresult
GetFileOrDirectoryTask::Work()
{
  MOZ_ASSERT(FileSystemUtils::IsParentProcess(),
             "Only call from parent process!");
  MOZ_ASSERT(!NS_IsMainThread(), "Only call on worker thread!");

  if (mFileSystem->IsShutdown()) {
    return NS_ERROR_FAILURE;
  }

  // Whether we want to get the root directory.
  bool getRoot = mTargetRealPath.IsEmpty();

  nsCOMPtr<nsIFile> file = mFileSystem->GetLocalFile(mTargetRealPath);
  if (!file) {
    return NS_ERROR_DOM_FILESYSTEM_INVALID_PATH_ERR;
  }

  bool exists;
  nsresult rv = file->Exists(&exists);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (!exists) {
    if (!getRoot) {
      return NS_ERROR_DOM_FILE_NOT_FOUND_ERR;
    }

    // If the root directory doesn't exit, create it.
    rv = file->Create(nsIFile::DIRECTORY_TYPE, 0777);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }
  }

  // Get isDirectory.
  rv = file->IsDirectory(&mIsDirectory);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (mIsDirectory) {
    return NS_OK;
  }

  // Check if the root is a directory.
  if (getRoot) {
    return NS_ERROR_DOM_FILESYSTEM_TYPE_MISMATCH_ERR;
  }

  bool isFile;
  // Get isFile
  rv = file->IsFile(&isFile);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (!isFile) {
    // Neither directory or file.
    return NS_ERROR_DOM_FILESYSTEM_TYPE_MISMATCH_ERR;
  }

  if (!mFileSystem->IsSafeFile(file)) {
    return NS_ERROR_DOM_SECURITY_ERR;
  }

  mTargetFileImpl = new DOMFileImplFile(file);

  return NS_OK;
}