C++ QAtomicInt::fetchAndAddRelaxed方法代码示例

/**
 * Network streaming request
 */
NetStream::NetStream(const QUrl &url, EMode mode /*= kPreferCache*/) :
    m_id(s_nRequest.fetchAndAddRelaxed(1)),
    m_state(kClosed),
    m_pending(0),
    m_reply(0),
    m_nRedirections(0),
    m_size(-1),
    m_pos(0)
{
    setObjectName("NetStream " + url.toString());

    m_request.setAttribute(QNetworkRequest::CacheLoadControlAttribute,
        mode == kAlwaysCache ? QNetworkRequest::AlwaysCache :
        mode == kPreferCache ? QNetworkRequest::PreferCache :
        mode == kNeverCache ? QNetworkRequest::AlwaysNetwork :
            QNetworkRequest::PreferNetwork );

    // Receive requestStarted signals from NAMThread when it processes a NetStreamRequest
    connect(&NAMThread::manager(), SIGNAL(requestStarted(int, QNetworkReply*)),
        this, SLOT(slotRequestStarted(int, QNetworkReply*)), Qt::DirectConnection );

    QMutexLocker locker(&m_mutex);

    if (Request(url))
        m_state = kPending;
}

/*!
    Looks up the IP address(es) associated with host name \a name, and
    returns an ID for the lookup. When the result of the lookup is
    ready, the slot or signal \a member in \a receiver is called with
    a QHostInfo argument. The QHostInfo object can then be inspected
    to get the results of the lookup.

    The lookup is performed by a single function call, for example:

    \snippet doc/src/snippets/code/src_network_kernel_qhostinfo.cpp 2

    The implementation of the slot prints basic information about the
    addresses returned by the lookup, or reports an error if it failed:

    \snippet doc/src/snippets/code/src_network_kernel_qhostinfo.cpp 3

    If you pass a literal IP address to \a name instead of a host name,
    QHostInfo will search for the domain name for the IP (i.e., QHostInfo will
    perform a \e reverse lookup). On success, the resulting QHostInfo will
    contain both the resolved domain name and IP addresses for the host
    name. Example:

    \snippet doc/src/snippets/code/src_network_kernel_qhostinfo.cpp 4

    \note There is no guarantee on the order the signals will be emitted
    if you start multiple requests with lookupHost().

    \sa abortHostLookup(), addresses(), error(), fromName()
*/
int QHostInfo::lookupHost(const QString &name, QObject *receiver,
                          const char *member)
{
#if defined QHOSTINFO_DEBUG
    qDebug("QHostInfo::lookupHost(\"%s\", %p, %s)",
           name.toLatin1().constData(), receiver, member ? member + 1 : 0);
#endif

    if (!QAbstractEventDispatcher::instance(QThread::currentThread())) {
        qWarning("QHostInfo::lookupHost() called with no event dispatcher");
        return -1;
    }

    qRegisterMetaType<QHostInfo>("QHostInfo");

    int id = theIdCounter.fetchAndAddRelaxed(1); // generate unique ID

    if (name.isEmpty()) {
        if (!receiver)
            return -1;

        QHostInfo hostInfo(id);
        hostInfo.setError(QHostInfo::HostNotFound);
        hostInfo.setErrorString(QCoreApplication::translate("QHostInfo", "No host name given"));
        QScopedPointer<QHostInfoResult> result(new QHostInfoResult);
        QObject::connect(result.data(), SIGNAL(resultsReady(QHostInfo)),
                         receiver, member, Qt::QueuedConnection);
        result.data()->emitResultsReady(hostInfo);
        return id;
    }

    QHostInfoLookupManager *manager = theHostInfoLookupManager();

    if (manager) {
        // the application is still alive
        if (manager->cache.isEnabled()) {
            // check cache first
            bool valid = false;
            QHostInfo info = manager->cache.get(name, &valid);
            if (valid) {
                if (!receiver)
                    return -1;

                info.setLookupId(id);
                QHostInfoResult result;
                QObject::connect(&result, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
                result.emitResultsReady(info);
                return id;
            }
        }

        // cache is not enabled or it was not in the cache, do normal lookup
        QHostInfoRunnable* runnable = new QHostInfoRunnable(name, id);
        if (receiver)
            QObject::connect(&runnable->resultEmitter, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
        manager->scheduleLookup(runnable);
    }

    return id;
}

static LoggingItem *createItem(
    const char *_file, const char *_function,
    int _line, LogLevel_t _level, int _type)
{
    LoggingItem *item = new LoggingItem(
        _file, _function, _line, _level, _type);

    malloc_count.ref();

#if DEBUG_MEMORY
    int val = item_count.fetchAndAddRelaxed(1) + 1;
    if (val == 0)
        memory_time.start();
    max_count = (val > max_count) ? val : max_count;
    if (memory_time.elapsed() > 1000)
    {
        cout<<"current memory usage: "
            <<val<<" * "<<sizeof(LoggingItem)<<endl;
        cout<<"max memory usage: "
            <<max_count<<" * "<<sizeof(LoggingItem)<<endl;
        cout<<"malloc count: "<<(int)malloc_count<<endl;
        memory_time.start();
    }
#else
    item_count.ref();
#endif

    return item;
}

    bool runIterations(TestIterator/*beginIterator*/, int begin, int end, void *)
    {
        iterations.fetchAndAddRelaxed(end - begin);
#ifdef PRINT
        qDebug() << QThread::currentThread() << "iteration" << begin <<  "to" << end << "(exclusive)";
#endif
        return false;
    }

QT_BEGIN_NAMESPACE

QFbWindow::QFbWindow(QWindow *window)
    : QPlatformWindow(window), mBackingStore(0)
{
    static QAtomicInt winIdGenerator(1);
    mWindowId = winIdGenerator.fetchAndAddRelaxed(1);

    platformScreen()->addWindow(this);
}

			QDBusConnection trackerBus(bool is_thread_private)
			{
				if(!is_thread_private)
					return QDBusConnection::sessionBus();

				// Create a separate D-Bus connection for each thread. Use ClosingDBusConnection so
				// that the bus gets disconnected when the thread storage is deleted.
				if (!dbus_tls.hasLocalData()) {
					QString id = QString::number(counter.fetchAndAddRelaxed(1))
							.prepend("libqttracker-dbus-");
					dbus_tls.setLocalData(new ClosingDBusConnection
							(QDBusConnection::connectToBus(QDBusConnection::SessionBus, id)));
				}
				return *dbus_tls.localData();
			}

bool PropertyCacheCreator::createMetaObject(int objectIndex, const QmlIR::Object *obj, QQmlPropertyCache *baseTypeCache)
{
    QQmlPropertyCache *cache = baseTypeCache->copyAndReserve(QQmlEnginePrivate::get(enginePrivate),
                                                             obj->propertyCount(),
                                                             obj->functionCount() + obj->propertyCount() + obj->signalCount(),
                                                             obj->signalCount() + obj->propertyCount());
    propertyCaches[objectIndex] = cache;

    struct TypeData {
        QV4::CompiledData::Property::Type dtype;
        int metaType;
    } builtinTypes[] = {
        { QV4::CompiledData::Property::Var, qMetaTypeId<QJSValue>() },
        { QV4::CompiledData::Property::Variant, QMetaType::QVariant },
        { QV4::CompiledData::Property::Int, QMetaType::Int },
        { QV4::CompiledData::Property::Bool, QMetaType::Bool },
        { QV4::CompiledData::Property::Real, QMetaType::Double },
        { QV4::CompiledData::Property::String, QMetaType::QString },
        { QV4::CompiledData::Property::Url, QMetaType::QUrl },
        { QV4::CompiledData::Property::Color, QMetaType::QColor },
        { QV4::CompiledData::Property::Font, QMetaType::QFont },
        { QV4::CompiledData::Property::Time, QMetaType::QTime },
        { QV4::CompiledData::Property::Date, QMetaType::QDate },
        { QV4::CompiledData::Property::DateTime, QMetaType::QDateTime },
        { QV4::CompiledData::Property::Rect, QMetaType::QRectF },
        { QV4::CompiledData::Property::Point, QMetaType::QPointF },
        { QV4::CompiledData::Property::Size, QMetaType::QSizeF },
        { QV4::CompiledData::Property::Vector2D, QMetaType::QVector2D },
        { QV4::CompiledData::Property::Vector3D, QMetaType::QVector3D },
        { QV4::CompiledData::Property::Vector4D, QMetaType::QVector4D },
        { QV4::CompiledData::Property::Matrix4x4, QMetaType::QMatrix4x4 },
        { QV4::CompiledData::Property::Quaternion, QMetaType::QQuaternion }
    };
    static const uint builtinTypeCount = sizeof(builtinTypes) / sizeof(TypeData);

    QByteArray newClassName;

    if (objectIndex == compiler->rootObjectIndex()) {
        QString path = compiler->data()->url.path();
        int lastSlash = path.lastIndexOf(QLatin1Char('/'));
        if (lastSlash > -1) {
            QString nameBase = path.mid(lastSlash + 1, path.length()-lastSlash-5);
            if (!nameBase.isEmpty() && nameBase.at(0).isUpper())
                newClassName = nameBase.toUtf8() + "_QMLTYPE_" +
                               QByteArray::number(classIndexCounter.fetchAndAddRelaxed(1));
        }
    }
    if (newClassName.isEmpty()) {
        newClassName = QQmlMetaObject(baseTypeCache).className();
        newClassName.append("_QML_");
        newClassName.append(QByteArray::number(classIndexCounter.fetchAndAddRelaxed(1)));
    }

    cache->_dynamicClassName = newClassName;

    int aliasCount = 0;
    int varPropCount = 0;

    QmlIR::PropertyResolver resolver(baseTypeCache);

    for (const QmlIR::Property *p = obj->firstProperty(); p; p = p->next) {
        if (p->type == QV4::CompiledData::Property::Alias)
            aliasCount++;
        else if (p->type == QV4::CompiledData::Property::Var)
            varPropCount++;

        // No point doing this for both the alias and non alias cases
        bool notInRevision = false;
        QQmlPropertyData *d = resolver.property(stringAt(p->nameIndex), &notInRevision);
        if (d && d->isFinal()) {
            compiler->recordError(p->location, tr("Cannot override FINAL property"));
            return false;
        }
    }

    typedef QQmlVMEMetaData VMD;

    QByteArray &dynamicData = vmeMetaObjects[objectIndex] = QByteArray(sizeof(QQmlVMEMetaData)
                                                              + obj->propertyCount() * sizeof(VMD::PropertyData)
                                                              + obj->functionCount() * sizeof(VMD::MethodData)
                                                              + aliasCount * sizeof(VMD::AliasData), 0);

    int effectivePropertyIndex = cache->propertyIndexCacheStart;
    int effectiveMethodIndex = cache->methodIndexCacheStart;

    // For property change signal override detection.
    // We prepopulate a set of signal names which already exist in the object,
    // and throw an error if there is a signal/method defined as an override.
    QSet<QString> seenSignals;
    seenSignals << QStringLiteral("destroyed") << QStringLiteral("parentChanged") << QStringLiteral("objectNameChanged");
    QQmlPropertyCache *parentCache = cache;
    while ((parentCache = parentCache->parent())) {
        if (int pSigCount = parentCache->signalCount()) {
            int pSigOffset = parentCache->signalOffset();
            for (int i = pSigOffset; i < pSigCount; ++i) {
                QQmlPropertyData *currPSig = parentCache->signal(i);
                // XXX TODO: find a better way to get signal name from the property data :-/
                for (QQmlPropertyCache::StringCache::ConstIterator iter = parentCache->stringCache.begin();
                        iter != parentCache->stringCache.end(); ++iter) {
                    if (currPSig == (*iter).second) {
//.........这里部分代码省略.........