C++ QThread::setPriority方法代码示例

void SurfaceRenderWidget::setFormula( const QString &formula )
{
	makeCurrent();
	std::string std_formula = QStringToSTDString( formula );

	QThread *currentThread = QThread::currentThread();
	QThread::Priority current_priority = currentThread->priority();
	currentThread->setPriority( QThread::LowPriority );

	ShaderManager::ErrorCode error_code = sm->create_shader( std_formula );

	currentThread->setPriority( current_priority );

	callParsingComplete( error_code );
	update();
}

void batch_download_wechat_msg_list::_downAllArticles()
{
	//todo:加入多线程
	g_nCurArticleLinkIndex = 0;
	int nEachThread = g_urlContainer.size() / g_nThreadCount;
	for (int iTd = 0; iTd < g_nThreadCount; ++iTd)
	{
		download_task* task = new download_task(iTd);
		if (iTd < g_nThreadCount - 1)
			task->setDownloadRange(iTd * nEachThread, (iTd + 1) * nEachThread - 1);
		else if (iTd == g_nThreadCount - 1)
			task->setDownloadRange(iTd * nEachThread, g_urlContainer.size() - 1);

		QEventLoop loop;
		QThread* td = new QThread(this);
		QLabel* label = new QLabel(this);
		td->setPriority(QThread::HighestPriority);
		task->moveToThread(td);
		ui.statusLayout->addWidget(label, Qt::AlignJustify);
		ui.statusLayout->update();
		m_labels[iTd] = label;

		connect(td, SIGNAL(started()), task, SLOT(onThreadTaskStart()));
		connect(task, SIGNAL(downloadFinished()), td, SLOT(quit()));
		connect(task, SIGNAL(notifyUpdateLogUI(const QString&)), this, SLOT(onUpdateLogUI(const QString&)));
		connect(task, SIGNAL(oneArticleFinished()), this, SLOT(onOneArticleFinished()));
		connect(td, SIGNAL(finished()), &loop, SLOT(quit()));
		connect(task, SIGNAL(notifyUpdateStatusLabel(int,int)), this, SLOT(onNotifyUpdateStatusLabel(int,int)));
		td->start();
	}
	ui.statusLabel->setText("准备就绪");
}

TreeItem* TraktorFeature::importLibrary(QString file) {
    //Give thread a low priority
    QThread* thisThread = QThread::currentThread();
    thisThread->setPriority(QThread::LowestPriority);
    //Invisible root item of Traktor's child model
    TreeItem* root = NULL;
    //Delete all table entries of Traktor feature
    ScopedTransaction transaction(m_database);
    clearTable("traktor_playlist_tracks");
    clearTable("traktor_library");
    clearTable("traktor_playlists");
    transaction.commit();

    transaction.transaction();
    QSqlQuery query(m_database);
    query.prepare("INSERT INTO traktor_library (artist, title, album, year,"
                  "genre,comment,tracknumber,bpm, bitrate,duration, location,"
                  "rating,key) VALUES (:artist, :title, :album, :year,:genre,"
                  ":comment, :tracknumber,:bpm, :bitrate,:duration, :location,"
                  ":rating,:key)");

    //Parse Trakor XML file using SAX (for performance)
    QFile traktor_file(file);
    if (!traktor_file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug() << "Cannot open Traktor music collection";
        return NULL;
    }
    QXmlStreamReader xml(&traktor_file);
    bool inCollectionTag = false;
    //TODO(XXX) is this still needed to parse the library correctly?
    bool inEntryTag = false;
    bool inPlaylistsTag = false;
    bool isRootFolderParsed = false;
    int nAudioFiles = 0;

    while (!xml.atEnd() && !m_cancelImport) {
        xml.readNext();
        if (xml.isStartElement()) {
            if (xml.name() == "COLLECTION") {
                inCollectionTag = true;
            }
            // Each "ENTRY" tag in <COLLECTION> represents a track
            if (inCollectionTag && xml.name() == "ENTRY" ) {
                inEntryTag = true;
                //parse track
                parseTrack(xml, query);
                ++nAudioFiles; //increment number of files in the music collection
            }
            if (xml.name() == "PLAYLISTS") {
                inPlaylistsTag = true;
            } if (inPlaylistsTag && !isRootFolderParsed && xml.name() == "NODE") {
                QXmlStreamAttributes attr = xml.attributes();
                QString nodetype = attr.value("TYPE").toString();
                QString name = attr.value("NAME").toString();

                if (nodetype == "FOLDER" && name == "$ROOT") {
                    //process all playlists
                    root = parsePlaylists(xml);
                    isRootFolderParsed = true;
                }
            }
        }
        if (xml.isEndElement()) {
            if (xml.name() == "COLLECTION") {
                inCollectionTag = false;
            }
            if (xml.name() == "ENTRY" && inCollectionTag) {
                inEntryTag = false;
            }
            if (xml.name() == "PLAYLISTS" && inPlaylistsTag) {
                inPlaylistsTag = false;
            }
        }
    }
    if (xml.hasError()) {
         // do error handling
         qDebug() << "Cannot process Traktor music collection";
         if (root)
             delete root;
         return NULL;
    }

    qDebug() << "Found: " << nAudioFiles << " audio files in Traktor";
    //initialize TraktorTableModel
    transaction.commit();

    return root;
}

// This method is executed in a separate thread
// via QtConcurrent::run
TreeItem* ITunesFeature::importLibrary() {
    //Give thread a low priority
    QThread* thisThread = QThread::currentThread();
    thisThread->setPriority(QThread::LowestPriority);

    //Delete all table entries of iTunes feature
    ScopedTransaction transaction(m_database);
    clearTable("itunes_playlist_tracks");
    clearTable("itunes_library");
    clearTable("itunes_playlists");
    transaction.commit();

    qDebug() << "ITunesFeature::importLibrary() ";

    transaction.transaction();

    // By default set m_mixxxItunesRoot and m_dbItunesRoot to strip out
    // file://localhost/ from the URL. When we load the user's iTunes XML
    // configuration we may replace this with something based on the detected
    // location of the user's iTunes path but the defaults are necessary in case
    // their iTunes XML does not include the "Music Folder" key.
    m_mixxxItunesRoot = "";
    m_dbItunesRoot = localhost_token();

    //Parse iTunes XML file using SAX (for performance)
    QFile itunes_file(m_dbfile);
    if (!itunes_file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug() << "Cannot open iTunes music collection";
        return NULL;
    }
    QXmlStreamReader xml(&itunes_file);
    TreeItem* playlist_root = NULL;
    while (!xml.atEnd() && !m_cancelImport) {
        xml.readNext();
        if (xml.isStartElement()) {
            if (xml.name() == "key") {
                QString key = xml.readElementText();
                if (key == "Music Folder") {
                    if (readNextStartElement(xml)) {
                        guessMusicLibraryMountpoint(xml);
                    }
                } else if (key == "Tracks") {
                    parseTracks(xml);
                    playlist_root = parsePlaylists(xml);
                }
            }
        }
    }

    itunes_file.close();

    // Even if an error occured, commit the transaction. The file may have been
    // half-parsed.
    transaction.commit();

    if (xml.hasError()) {
        // do error handling
        qDebug() << "Cannot process iTunes music collection";
        qDebug() << "XML ERROR: " << xml.errorString();
        if (playlist_root)
            delete playlist_root;
        playlist_root = NULL;
    }
    return playlist_root;
}

AssignmentClient::AssignmentClient(Assignment::Type requestAssignmentType, QString assignmentPool,
                                   quint16 listenPort, QUuid walletUUID, QString assignmentServerHostname,
                                   quint16 assignmentServerPort, quint16 assignmentMonitorPort) :
    _assignmentServerHostname(DEFAULT_ASSIGNMENT_SERVER_HOSTNAME)
{
    LogUtils::init();

    QSettings::setDefaultFormat(QSettings::IniFormat);

    DependencyManager::set<AccountManager>();
 
    auto scriptableAvatar = DependencyManager::set<ScriptableAvatar>();
    auto addressManager = DependencyManager::set<AddressManager>();
    auto scriptEngines = DependencyManager::set<ScriptEngines>();

    // create a NodeList as an unassigned client, must be after addressManager
    auto nodeList = DependencyManager::set<NodeList>(NodeType::Unassigned, listenPort);

    auto animationCache = DependencyManager::set<AnimationCache>();
    auto entityScriptingInterface = DependencyManager::set<EntityScriptingInterface>(false);

    DependencyManager::registerInheritance<EntityActionFactoryInterface, AssignmentActionFactory>();
    auto actionFactory = DependencyManager::set<AssignmentActionFactory>();
    DependencyManager::set<ResourceScriptingInterface>();

    // setup a thread for the NodeList and its PacketReceiver
    QThread* nodeThread = new QThread(this);
    nodeThread->setObjectName("NodeList Thread");
    nodeThread->start();

    // make sure the node thread is given highest priority
    nodeThread->setPriority(QThread::TimeCriticalPriority);

    // put the NodeList on the node thread
    nodeList->moveToThread(nodeThread);

    // set the logging target to the the CHILD_TARGET_NAME
    LogHandler::getInstance().setTargetName(ASSIGNMENT_CLIENT_TARGET_NAME);

    // make sure we output process IDs for a child AC otherwise it's insane to parse
    LogHandler::getInstance().setShouldOutputProcessID(true);

    // setup our _requestAssignment member variable from the passed arguments
    _requestAssignment = Assignment(Assignment::RequestCommand, requestAssignmentType, assignmentPool);

    // check for a wallet UUID on the command line or in the config
    // this would represent where the user running AC wants funds sent to
    if (!walletUUID.isNull()) {
        qCDebug(assigmnentclient) << "The destination wallet UUID for credits is" << uuidStringWithoutCurlyBraces(walletUUID);
        _requestAssignment.setWalletUUID(walletUUID);
    }

    // check for an overriden assignment server hostname
    if (assignmentServerHostname != "") {
        // change the hostname for our assignment server
        _assignmentServerHostname = assignmentServerHostname;
    }

    _assignmentServerSocket = HifiSockAddr(_assignmentServerHostname, assignmentServerPort, true);
    _assignmentServerSocket.setObjectName("AssigmentServer");
    nodeList->setAssignmentServerSocket(_assignmentServerSocket);

    qCDebug(assigmnentclient) << "Assignment server socket is" << _assignmentServerSocket;

    // call a timer function every ASSIGNMENT_REQUEST_INTERVAL_MSECS to ask for assignment, if required
    qCDebug(assigmnentclient) << "Waiting for assignment -" << _requestAssignment;

    if (_assignmentServerHostname != "localhost") {
        qCDebug(assigmnentclient) << "- will attempt to connect to domain-server on" << _assignmentServerSocket.getPort();
    }

    connect(&_requestTimer, SIGNAL(timeout()), SLOT(sendAssignmentRequest()));
    _requestTimer.start(ASSIGNMENT_REQUEST_INTERVAL_MSECS);

    // connections to AccountManager for authentication
    connect(DependencyManager::get<AccountManager>().data(), &AccountManager::authRequired,
            this, &AssignmentClient::handleAuthenticationRequest);

    // Create Singleton objects on main thread
    NetworkAccessManager::getInstance();

    // did we get an assignment-client monitor port?
    if (assignmentMonitorPort > 0) {
        _assignmentClientMonitorSocket = HifiSockAddr(DEFAULT_ASSIGNMENT_CLIENT_MONITOR_HOSTNAME, assignmentMonitorPort);
        _assignmentClientMonitorSocket.setObjectName("AssignmentClientMonitor");

        qCDebug(assigmnentclient) << "Assignment-client monitor socket is" << _assignmentClientMonitorSocket;

        // Hook up a timer to send this child's status to the Monitor once per second
        setUpStatusToMonitor();
    }
    auto& packetReceiver = DependencyManager::get<NodeList>()->getPacketReceiver();
    packetReceiver.registerListener(PacketType::CreateAssignment, this, "handleCreateAssignmentPacket");
    packetReceiver.registerListener(PacketType::StopNode, this, "handleStopNodePacket");
}

// This method is executed in a separate thread
// via QtConcurrent::run
TreeItem* ITunesFeature::importLibrary() {
    bool isTracksParsed=false;
    bool isMusicFolderLocatedAfterTracks=false;
  
    //Give thread a low priority
    QThread* thisThread = QThread::currentThread();
    thisThread->setPriority(QThread::LowPriority);

    //Delete all table entries of iTunes feature
    ScopedTransaction transaction(m_database);
    clearTable("itunes_playlist_tracks");
    clearTable("itunes_library");
    clearTable("itunes_playlists");
    transaction.commit();

    qDebug() << "ITunesFeature::importLibrary() ";

    transaction.transaction();

    // By default set m_mixxxItunesRoot and m_dbItunesRoot to strip out
    // file://localhost/ from the URL. When we load the user's iTunes XML
    // configuration we may replace this with something based on the detected
    // location of the user's iTunes path but the defaults are necessary in case
    // their iTunes XML does not include the "Music Folder" key.
    m_mixxxItunesRoot = "";
    m_dbItunesRoot = localhost_token();

    //Parse iTunes XML file using SAX (for performance)
    QFile itunes_file(m_dbfile);
    if (!itunes_file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug() << "Cannot open iTunes music collection";
        return NULL;
    }

    QXmlStreamReader xml(&itunes_file);
    TreeItem* playlist_root = NULL;
    while (!xml.atEnd() && !m_cancelImport) {
        xml.readNext();
        if (xml.isStartElement()) {
            if (xml.name() == "key") {
                QString key = xml.readElementText();
                if (key == "Music Folder") {
                    if (isTracksParsed) isMusicFolderLocatedAfterTracks = true;
                    if (readNextStartElement(xml)) {
                        guessMusicLibraryMountpoint(xml);
                    }
                } else if (key == "Tracks") {
                    parseTracks(xml);
                    if (playlist_root != NULL)
                        delete playlist_root;
                    playlist_root = parsePlaylists(xml);
                    isTracksParsed = true;
                }
            }
        }
    }

    itunes_file.close();
    
    if (isMusicFolderLocatedAfterTracks) {
        qDebug() << "Updating iTunes real path from " << m_dbItunesRoot << " to " << m_mixxxItunesRoot;
        // In some iTunes files "Music Folder" XML node is located at the end of file. So, we need to 
        QSqlQuery query(m_database);
        query.prepare("UPDATE itunes_library SET location = replace( location, :itunes_path, :mixxx_path )");
        query.bindValue(":itunes_path", m_dbItunesRoot.replace(localhost_token(), ""));
        query.bindValue(":mixxx_path", m_mixxxItunesRoot);
        bool success = query.exec();

        if (!success) {
            LOG_FAILED_QUERY(query);
        }
    }

    // Even if an error occurred, commit the transaction. The file may have been
    // half-parsed.
    transaction.commit();

    if (xml.hasError()) {
        // do error handling
        qDebug() << "Cannot process iTunes music collection";
        qDebug() << "XML ERROR: " << xml.errorString();
        if (playlist_root)
            delete playlist_root;
        playlist_root = NULL;
    }
    return playlist_root;
}