QEventDispatcherBlackberry Class Reference

#include <qeventdispatcher_blackberry_p.h>

Inheritance diagram for QEventDispatcherBlackberry:

Public Functions
	QEventDispatcherBlackberry (QObject *parent=0)
void	registerSocketNotifier (QSocketNotifier *notifier)
	Registers notifier with the event loop. More...
void	unregisterSocketNotifier (QSocketNotifier *notifier)
	Unregisters notifier from the event dispatcher. More...
void	wakeUp ()
	Wakes up the event loop. More...
	~QEventDispatcherBlackberry ()
Public Functions inherited from QEventDispatcherUNIX
void	flush ()
	Flushes the event queue. More...
bool	hasPendingEvents ()
	Returns true if there is an event waiting; otherwise returns false. More...
void	interrupt ()
	Interrupts event dispatching; i. More...
bool	processEvents (QEventLoop::ProcessEventsFlags flags)
	Processes pending events that match flags until there are no more events to process. More...
	QEventDispatcherUNIX (QObject *parent=0)
QList< TimerInfo >	registeredTimers (QObject *object) const
	Returns a list of registered timers for object. More...
void	registerSocketNotifier (QSocketNotifier *notifier)
	Registers notifier with the event loop. More...
void	registerTimer (int timerId, int interval, QObject *object)
void	unregisterSocketNotifier (QSocketNotifier *notifier)
	Unregisters notifier from the event dispatcher. More...
bool	unregisterTimer (int timerId)
bool	unregisterTimers (QObject *object)
void	wakeUp ()
	Wakes up the event loop. More...
	~QEventDispatcherUNIX ()
Public Functions inherited from QAbstractEventDispatcher
virtual void	closingDown ()
bool	filterEvent (void *message)
	Sends message through the event filter that was set by setEventFilter(). More...
	QAbstractEventDispatcher (QObject *parent=0)
	Constructs a new event dispatcher with the given parent. More...
int	registerTimer (int interval, QObject *object)
	Registers a timer with the specified interval for the given object. More...
EventFilter	setEventFilter (EventFilter filter)
	Replaces the event filter function for this QAbstractEventDispatcher with filter and returns the replaced event filter function. More...
virtual void	startingUp ()
	~QAbstractEventDispatcher ()
	Destroys the event dispatcher. More...
Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...
const QObjectList &	children () const
	Returns a list of child objects. More...
bool	connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0)
bool	disconnect (const QObject *receiver, const char *member=0)
void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...
void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...
QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...
virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...
virtual bool	eventFilter (QObject *, QEvent *)
	Filters events if this object has been installed as an event filter for the watched object. More...
template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...
template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...
template<typename T >
QList< T >	findChildren (const QRegExp &re) const
bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...
void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...
bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...
void	killTimer (int id)
	Kills the timer with timer identifier, id. More...
virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...
void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...
QString	objectName () const
QObject *	parent () const
	Returns a pointer to the parent object. More...
QVariant	property (const char *name) const
	Returns the value of the object's name property. More...
Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...
void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...
void	setObjectName (const QString &name)
void	setParent (QObject *)
	Makes the object a child of parent. More...
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...
void	setUserData (uint id, QObjectUserData *data)
bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...
int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...
QThread *	thread () const
	Returns the thread in which the object lives. More...
QObjectUserData *	userData (uint id) const
virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Protected Functions
int	ioEvents (int fd)
	QEventDispatcherBlackberry (QEventDispatcherBlackberryPrivate &dd, QObject *parent=0)
int	select (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, timeval *timeout)
Protected Functions inherited from QEventDispatcherUNIX
int	activateSocketNotifiers ()
int	activateTimers ()
	QEventDispatcherUNIX (QEventDispatcherUNIXPrivate &dd, QObject *parent=0)
void	setSocketNotifierPending (QSocketNotifier *notifier)
Protected Functions inherited from QAbstractEventDispatcher
	QAbstractEventDispatcher (QAbstractEventDispatcherPrivate &, QObject *parent)
Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...
virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...
virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...
virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...
	QObject (QObjectPrivate &dd, QObject *parent=0)
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...
int	senderSignalIndex () const
virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Additional Inherited Members
Public Types inherited from QAbstractEventDispatcher
typedef bool(*	EventFilter) (void *message)
	Typedef for a function with the signature. More...
typedef QPair< int, int >	TimerInfo
	Typedef for QPair<int, int>. More...
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...
Signals inherited from QAbstractEventDispatcher
void	aboutToBlock ()
	This signal is emitted before the event loop calls a function that could block. More...
void	awake ()
	This signal is emitted after the event loop returns from a function that could block. More...
Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...
Static Public Functions inherited from QAbstractEventDispatcher
static QAbstractEventDispatcher *	instance (QThread *thread=0)
	Returns a pointer to the event dispatcher object for the specified thread. More...
Static Public Functions inherited from QObject
static bool	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...
static bool	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
static bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
	Disconnects signal in object sender from method in object receiver. More...
static bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static uint	registerUserData ()
static QString	tr (const char *sourceText, const char *comment=0, int n=-1)
static QString	trUtf8 (const char *sourceText, const char *comment=0, int n=-1)
Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...
Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject
Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()
T *	qobject_cast (QObject *object)
	QObjectList
void *	qt_find_obj_child (QObject *parent, const char *type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

Definition at line 62 of file qeventdispatcher_blackberry_p.h.

Constructors and Destructors

QEventDispatcherBlackberry() [1/2]

QEventDispatcherBlackberry::QEventDispatcherBlackberry ( QObject *  parent = 0 )

explicit

Definition at line 209 of file qeventdispatcher_blackberry.cpp.

    : QEventDispatcherUNIX(*new QEventDispatcherBlackberryPrivate, parent)
{
}

~QEventDispatcherBlackberry()

QEventDispatcherBlackberry::~QEventDispatcherBlackberry

(

)

Definition at line 219 of file qeventdispatcher_blackberry.cpp.

{
}

QEventDispatcherBlackberry() [2/2]

QEventDispatcherBlackberry::QEventDispatcherBlackberry ( QEventDispatcherBlackberryPrivate &  dd, QObject *  parent = 0  )

protected

Definition at line 214 of file qeventdispatcher_blackberry.cpp.

    : QEventDispatcherUNIX(dd, parent)
{
}

Functions

ioEvents()

int QEventDispatcherBlackberry::ioEvents ( int  fd )

protected

Definition at line 489 of file qeventdispatcher_blackberry.cpp.

Referenced by registerSocketNotifier(), and unregisterSocketNotifier().

{
    int io_events = 0;

    Q_D(QEventDispatcherBlackberry);

    if (FD_ISSET(fd, &d->sn_vec[0].enabled_fds))
        io_events |= BPS_IO_INPUT;

    if (FD_ISSET(fd, &d->sn_vec[1].enabled_fds))
        io_events |= BPS_IO_OUTPUT;

    if (FD_ISSET(fd, &d->sn_vec[2].enabled_fds))
        io_events |= BPS_IO_EXCEPT;

    return io_events;
}

registerSocketNotifier()

void QEventDispatcherBlackberry::registerSocketNotifier ( QSocketNotifier *  notifier )

virtual

Registers notifier with the event loop.

Subclasses must implement this method to tie a socket notifier into another event loop.

Implements QAbstractEventDispatcher.

Definition at line 223 of file qeventdispatcher_blackberry.cpp.

{
    Q_ASSERT(notifier);
    Q_D(QEventDispatcherBlackberry);

    int sockfd = notifier->socket();
    int type = notifier->type();

    qEventDispatcherDebug << Q_FUNC_INFO << "fd =" << sockfd;

    if (Q_UNLIKELY(sockfd >= FD_SETSIZE)) {
        qWarning() << "QEventDispatcherBlackberry: cannot register QSocketNotifier (fd too high)"
                   << sockfd;
        return;
    }

    // Register the fd with bps
    BpsChannelScopeSwitcher channelSwitcher(d->bps_channel);
    int io_events = ioEvents(sockfd);
    if (io_events)
        bps_remove_fd(sockfd);

    switch (type) {
    case QSocketNotifier::Read:
        qEventDispatcherDebug << "Registering" << sockfd << "for Reads";
        io_events |= BPS_IO_INPUT;
        break;
    case QSocketNotifier::Write:
        qEventDispatcherDebug << "Registering" << sockfd << "for Writes";
        io_events |= BPS_IO_OUTPUT;
        break;
    case QSocketNotifier::Exception:
    default:
        qEventDispatcherDebug << "Registering" << sockfd << "for Exceptions";
        io_events |= BPS_IO_EXCEPT;
        break;
    }

    const int result = bps_add_fd(sockfd, io_events, &bpsIOHandler, d->ioData.data());
    if (Q_UNLIKELY(result != BPS_SUCCESS))
        qWarning() << "QEventDispatcherBlackberry: bps_add_fd failed";

    // Call the base Unix implementation. Needed to allow select() to be called correctly
    QEventDispatcherUNIX::registerSocketNotifier(notifier);
}

select()

int QEventDispatcherBlackberry::select ( int  nfds, fd_set *  readfds, fd_set *  writefds, fd_set *  exceptfds, timeval *  timeout  )

protectedvirtual

Reimplemented from QEventDispatcherUNIX.

Definition at line 314 of file qeventdispatcher_blackberry.cpp.

{
    Q_UNUSED(nfds);
    Q_D(QEventDispatcherBlackberry);
    const BBScopedLoopLevelCounter bbLoopCounter(d);

    BpsChannelScopeSwitcher channelSwitcher(d->bps_channel);

    // prepare file sets for bps callback
    d->ioData->count = 0;
    d->ioData->readfds = readfds;
    d->ioData->writefds = writefds;
    d->ioData->exceptfds = exceptfds;

    // reset all file sets
    if (readfds)
        FD_ZERO(readfds);

    if (writefds)
        FD_ZERO(writefds);

    if (exceptfds)
        FD_ZERO(exceptfds);

    bps_event_t *event = 0;
    unsigned int eventCount = 0;

    // If an event handler called through filterEvent() starts a nested event loop by creating a
    // new QEventLoop, we will recursively enter this function again.  However, each time
    // bps_get_event() is called, it destroys the last event it handed out before returning the
    // next event.  We don't want it to destroy the event that triggered the nested event loop,
    // since there may still be more handlers that need to get that event, once the nested event
    // loop is done and control returns to the outer event loop.
    //
    // So we move an event to a holding channel, which takes ownership of the event.  Putting
    // the event on our own channel allows us to manage when it is destroyed, keeping it alive
    // until we know we are done with it.  Each recursive call of this function needs to have
    // it's own holding channel, since a channel is a queue, not a stack.
    //
    // However, a recursive call into this function happens very rarely compared to the many
    // times this function is called.  We don't want to create a holding channel for each time
    // this function is called, only when it is called recursively.  Thus we have the instance
    // variable d->holding_channel to use in the common case.  We keep track of recursive calls
    // with d->loop_level.  If we are in a recursive call, then we create a new holding channel
    // for this run.
    int holding_channel = d->holding_channel;
    if ((d->loop_level > 1) &&
        Q_UNLIKELY(bps_channel_create(&holding_channel, 0) != BPS_SUCCESS)) {
        qWarning("QEventDispatcherBlackberry: bps_channel_create failed");
        holding_channel = -1;
    }

    // Convert timeout to milliseconds
    int timeoutTotal = -1;
    if (timeout)
        timeoutTotal = timevalToMillisecs(*timeout);
    int timeoutLeft = timeoutTotal;
    timeval startTime = qt_gettime();

    // This loop exists such that we can drain the bps event queue of all native events
    // more efficiently than if we were to return control to Qt after each event. This
    // is important for handling touch events which can come in rapidly.
    forever {
        // Only emit the awake() and aboutToBlock() signals in the second iteration. For the
        // first iteration, the UNIX event dispatcher will have taken care of that already.
        // Also native events are actually processed one loop iteration after they were
        // retrieved with bps_get_event().

        // Filtering the native event should happen between the awake() and aboutToBlock()
        // signal emissions. The calls awake() - filterNativeEvent() - aboutToBlock() -
        // bps_get_event() need not to be interrupted by a break or return statement.
        if (eventCount > 0) {
            if (event) {
                emit awake();
                filterEvent(static_cast<void*>(event));
                emit aboutToBlock();

                if (Q_LIKELY(holding_channel != -1)) {
                    // We are now done with this BPS event.  Destroy it.
                    destroyHeldBpsEvent(holding_channel);
                }
            }

            // Update the timeout
            // Clock source is monotonic, so we can recalculate how much timeout is left
            if (timeoutTotal != -1) {
                timeval t2 = qt_gettime();
                timeoutLeft = timeoutTotal
                              - (timevalToMillisecs(t2) - timevalToMillisecs(startTime));
                if (timeoutLeft < 0)
                    timeoutLeft = 0;
            }

            timeval tnext;
            if (d->timerList.timerWait(tnext)) {
                int timeoutNext = timevalToMillisecs(tnext);
                if (timeoutNext < timeoutLeft || timeoutTotal == -1) {
                    timeoutTotal = timeoutLeft = timeoutNext;
                    startTime = qt_gettime();
                }
            }
        }

        event = 0;
        {   // We need to increase loop level in this scope,
            // because bps_get_event can also invoke callbacks
            QScopedLoopLevelCounter loopLevelCounter(d->threadData);

            // Wait for event or file to be ready
            const int result = bps_get_event(&event, timeoutLeft);
            if (Q_UNLIKELY(result != BPS_SUCCESS))
                qWarning("QEventDispatcherBlackberry: bps_get_event failed");
        }

        if (!event)    // In case of !event, we break out of the loop to let Qt process the timers
            break;     // (since timeout has expired) and socket notifiers that are now ready.

        if (bps_event_get_domain(event) == bpsUnblockDomain) {
            timeoutTotal = 0;   // in order to immediately drain the event queue of native events
            event = 0;          // (especially touch move events) we don't break out here
        } else {
            // Move the event to our holding channel so we can manage when it is destroyed.
            if (Q_LIKELY(holding_channel != 1) &&
                Q_UNLIKELY(bps_channel_push_event(holding_channel, event) != BPS_SUCCESS)) {
                qWarning("QEventDispatcherBlackberry: bps_channel_push_event failed");
            }
        }

        ++eventCount;

        // Make sure we are not trapped in this loop due to continuous native events
        // also we cannot recalculate the timeout without a monotonic clock as the time may have changed
        const unsigned int maximumEventCount = 12;
        if (Q_UNLIKELY((eventCount > maximumEventCount && timeoutLeft == 0)
                       || !QElapsedTimer::isMonotonic())) {
            if (event) {
                filterEvent(static_cast<void*>(event));

                if (Q_LIKELY(holding_channel != -1)) {
                    // We are now done with this BPS event.  Destroy it.
                    destroyHeldBpsEvent(holding_channel);
                }
            }
            break;
        }
    }

    // If this was a recursive call into this function, a new holding channel was created for
    // this run, so destroy it now.
    if ((holding_channel != d->holding_channel) &&
        Q_LIKELY(holding_channel != -1) &&
        Q_UNLIKELY(bps_channel_destroy(holding_channel) != BPS_SUCCESS)) {
        qWarning("QEventDispatcherBlackberry: bps_channel_destroy failed");
    }

    // the number of bits set in the file sets
    return d->ioData->count;
}

unregisterSocketNotifier()

void QEventDispatcherBlackberry::unregisterSocketNotifier ( QSocketNotifier *  notifier )

virtual

Unregisters notifier from the event dispatcher.

Subclasses must reimplement this method to tie a socket notifier into another event loop. Reimplementations must call the base implementation.

Implements QAbstractEventDispatcher.

Definition at line 269 of file qeventdispatcher_blackberry.cpp.

{
    Q_D(QEventDispatcherBlackberry);

    int sockfd = notifier->socket();

    qEventDispatcherDebug << Q_FUNC_INFO << "fd =" << sockfd;

    if (Q_UNLIKELY(sockfd >= FD_SETSIZE)) {
        qWarning() << "QEventDispatcherBlackberry: cannot unregister QSocketNotifier" << sockfd;
        return;
    }

    // Allow the base Unix implementation to unregister the fd too (before call to ioEvents()!)
    QEventDispatcherUNIX::unregisterSocketNotifier(notifier);

    // Unregister the fd with bps
    BpsChannelScopeSwitcher channelSwitcher(d->bps_channel);
    int result = bps_remove_fd(sockfd);
    if (Q_UNLIKELY(result != BPS_SUCCESS))
        qWarning() << "QEventDispatcherBlackberry: bps_remove_fd failed" << sockfd;

    const int io_events = ioEvents(sockfd);
    // if other socket notifier is watching sockfd, readd it
    if (io_events) {
        result = bps_add_fd(sockfd, io_events, &bpsIOHandler, d->ioData.data());
        if (Q_UNLIKELY(result != BPS_SUCCESS))
            qWarning("QEventDispatcherBlackberry: bps_add_fd error");
    }
}

wakeUp()

void QEventDispatcherBlackberry::wakeUp ( )

virtual

Wakes up the event loop.

Note

This class or function is threadsafe.

See also

awake()

Implements QAbstractEventDispatcher.

Definition at line 474 of file qeventdispatcher_blackberry.cpp.

{
    Q_D(QEventDispatcherBlackberry);
    if (d->wakeUps.testAndSetAcquire(0, 1)) {
        bps_event_t *event;
        if (Q_LIKELY(bps_event_create(&event, bpsUnblockDomain, 0, 0, 0) == BPS_SUCCESS)) {
            if (Q_LIKELY(bps_channel_push_event(d->bps_channel, event) == BPS_SUCCESS))
                return;
            else
                bps_event_destroy(event);
        }
        qWarning("QEventDispatcherBlackberry: wakeUp failed");
    }
}

---

The documentation for this class was generated from the following files:

• /src/corelib/kernel/qeventdispatcher_blackberry_p.h
• /src/corelib/kernel/qeventdispatcher_blackberry.cpp