QEventDispatcherUNIX Class Reference

#include <qeventdispatcher_unix_p.h>

Inheritance diagram for QEventDispatcherUNIX:

Public Functions
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	activateSocketNotifiers ()
int	activateTimers ()
	QEventDispatcherUNIX (QEventDispatcherUNIXPrivate &dd, QObject *parent=0)
virtual int	select (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, timeval *timeout)
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 140 of file qeventdispatcher_unix_p.h.

Constructors and Destructors

QEventDispatcherUNIX() [1/2]

QEventDispatcherUNIX::QEventDispatcherUNIX ( QObject *  parent = 0 )

explicit

Definition at line 632 of file qeventdispatcher_unix.cpp.

    : QAbstractEventDispatcher(*new QEventDispatcherUNIXPrivate, parent)
{ }

~QEventDispatcherUNIX()

QEventDispatcherUNIX::~QEventDispatcherUNIX

(

)

Definition at line 640 of file qeventdispatcher_unix.cpp.

{
    Q_D(QEventDispatcherUNIX);
    d->threadData->eventDispatcher = 0;
}

QEventDispatcherUNIX() [2/2]

QEventDispatcherUNIX::QEventDispatcherUNIX ( QEventDispatcherUNIXPrivate &  dd, QObject *  parent = 0  )

protected

Definition at line 636 of file qeventdispatcher_unix.cpp.

    : QAbstractEventDispatcher(dd, parent)
{ }

Functions

activateSocketNotifiers()

int QEventDispatcherUNIX::activateSocketNotifiers ( )

protected

Definition at line 881 of file qeventdispatcher_unix.cpp.

{
    Q_D(QEventDispatcherUNIX);
    if (d->sn_pending_list.isEmpty())
        return 0;

    // activate entries
    int n_act = 0;
    QEvent event(QEvent::SockAct);
    while (!d->sn_pending_list.isEmpty()) {
        QSockNot *sn = d->sn_pending_list.takeFirst();
        if (FD_ISSET(sn->fd, sn->queue)) {
            FD_CLR(sn->fd, sn->queue);
            QCoreApplication::sendEvent(sn->obj, &event);
            ++n_act;
        }
    }
    return n_act;
}

activateTimers()

int QEventDispatcherUNIX::activateTimers ( )

protected

Definition at line 874 of file qeventdispatcher_unix.cpp.

Referenced by processEvents().

{
    Q_ASSERT(thread() == QThread::currentThread());
    Q_D(QEventDispatcherUNIX);
    return d->timerList.activateTimers();
}

flush()

void QEventDispatcherUNIX::flush ( )

virtual

Flushes the event queue.

This normally returns almost immediately. Does nothing on platforms other than X11.

Implements QAbstractEventDispatcher.

Reimplemented in QEventDispatcherQPA, QEventDispatcherQWS, QEventDispatcherX11, and QEventDispatcherBlackberryQPA.

Definition at line 969 of file qeventdispatcher_unix.cpp.

{ }

hasPendingEvents()

bool QEventDispatcherUNIX::hasPendingEvents ( )

virtual

Returns true if there is an event waiting; otherwise returns false.

Implements QAbstractEventDispatcher.

Reimplemented in QEventDispatcherQPA, QEventDispatcherQWS, QEventDispatcherX11, and QEventDispatcherBlackberryQPA.

Definition at line 947 of file qeventdispatcher_unix.cpp.

Referenced by QEventDispatcherBlackberryQPA::hasPendingEvents().

{
    extern uint qGlobalPostedEventsCount(); // from qapplication.cpp
    return qGlobalPostedEventsCount();
}

interrupt()

void QEventDispatcherUNIX::interrupt ( )

virtual

Interrupts event dispatching; i.

e. the event dispatcher will return from processEvents() as soon as possible.

Implements QAbstractEventDispatcher.

Definition at line 962 of file qeventdispatcher_unix.cpp.

{
    Q_D(QEventDispatcherUNIX);
    d->interrupt = true;
    wakeUp();
}

processEvents()

bool QEventDispatcherUNIX::processEvents ( QEventLoop::ProcessEventsFlags  flags )

virtual

Processes pending events that match flags until there are no more events to process.

Returns true if an event was processed; otherwise returns false.

This function is especially useful if you have a long running operation and want to show its progress without allowing user input; i.e. by using the QEventLoop::ExcludeUserInputEvents flag.

If the QEventLoop::WaitForMoreEvents flag is set in flags, the behavior of this function is as follows:

• If events are available, this function returns after processing them.

• If no events are available, this function will wait until more are available and return after processing newly available events.

If the QEventLoop::WaitForMoreEvents flag is not set in flags, and no events are available, this function will return immediately.

Note: This function does not process events continuously; it returns after all available events are processed.

See also

hasPendingEvents()

Implements QAbstractEventDispatcher.

Reimplemented in QEventDispatcherQPA, QEventDispatcherQWS, QEventDispatcherX11, and QEventDispatcherBlackberryQPA.

Definition at line 901 of file qeventdispatcher_unix.cpp.

Referenced by QEventDispatcherBlackberryQPA::processEvents(), QEventDispatcherX11::processEvents(), QEventDispatcherQWS::processEvents(), and QEventDispatcherQPA::processEvents().

{
    Q_D(QEventDispatcherUNIX);
    d->interrupt = false;

    // we are awake, broadcast it
    emit awake();
    QCoreApplicationPrivate::sendPostedEvents(0, 0, d->threadData);

    int nevents = 0;
    const bool canWait = (d->threadData->canWaitLocked()
                          && !d->interrupt
                          && (flags & QEventLoop::WaitForMoreEvents));

    if (canWait)
        emit aboutToBlock();

    if (!d->interrupt) {
        // return the maximum time we can wait for an event.
        timeval *tm = 0;
        timeval wait_tm = { 0l, 0l };
        if (!(flags & QEventLoop::X11ExcludeTimers)) {
            if (d->timerList.timerWait(wait_tm))
                tm = &wait_tm;
        }

        if (!canWait) {
            if (!tm)
                tm = &wait_tm;

            // no time to wait
            tm->tv_sec  = 0l;
            tm->tv_usec = 0l;
        }

        nevents = d->doSelect(flags, tm);

        // activate timers
        if (! (flags & QEventLoop::X11ExcludeTimers)) {
            nevents += activateTimers();
        }
    }
    // return true if we handled events, false otherwise
    return (nevents > 0);
}

registeredTimers()

QList< QEventDispatcherUNIX::TimerInfo > QEventDispatcherUNIX::registeredTimers ( QObject *  object ) const

virtual

Returns a list of registered timers for object.

The timer ID is the first member in each pair; the interval is the second.

Implements QAbstractEventDispatcher.

Definition at line 710 of file qeventdispatcher_unix.cpp.

{
    if (!object) {
        qWarning("QEventDispatcherUNIX:registeredTimers: invalid argument");
        return QList<TimerInfo>();
    }

    Q_D(const QEventDispatcherUNIX);
    return d->timerList.registeredTimers(object);
}

registerSocketNotifier()

void QEventDispatcherUNIX::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.

Reimplemented in QEventDispatcherQPA.

Definition at line 741 of file qeventdispatcher_unix.cpp.

Referenced by QEventDispatcherBlackberry::registerSocketNotifier(), and QEventDispatcherQPA::registerSocketNotifier().

{
    Q_ASSERT(notifier);
    int sockfd = notifier->socket();
    int type = notifier->type();
#ifndef QT_NO_DEBUG
    if (sockfd < 0
        || unsigned(sockfd) >= FD_SETSIZE) {
        qWarning("QSocketNotifier: Internal error");
        return;
    } else if (notifier->thread() != thread()
               || thread() != QThread::currentThread()) {
        qWarning("QSocketNotifier: socket notifiers cannot be enabled from another thread");
        return;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    QSockNotType::List &list = d->sn_vec[type].list;
    fd_set *fds  = &d->sn_vec[type].enabled_fds;
    QSockNot *sn;

    sn = new QSockNot;
    sn->obj = notifier;
    sn->fd = sockfd;
    sn->queue = &d->sn_vec[type].pending_fds;

    int i;
    for (i = 0; i < list.size(); ++i) {
        QSockNot *p = list[i];
        if (p->fd < sockfd)
            break;
        if (p->fd == sockfd) {
            static const char *t[] = { "Read", "Write", "Exception" };
            qWarning("QSocketNotifier: Multiple socket notifiers for "
                      "same socket %d and type %s", sockfd, t[type]);
        }
    }
    list.insert(i, sn);

    FD_SET(sockfd, fds);
    d->sn_highest = qMax(d->sn_highest, sockfd);
}

registerTimer()

void QEventDispatcherUNIX::registerTimer ( int  timerId, int  interval, QObject *  obj  )

virtual

Warning

This function is not part of the public interface.

Implements QAbstractEventDispatcher.

Definition at line 655 of file qeventdispatcher_unix.cpp.

{
#ifndef QT_NO_DEBUG
    if (timerId < 1 || interval < 0 || !obj) {
        qWarning("QEventDispatcherUNIX::registerTimer: invalid arguments");
        return;
    } else if (obj->thread() != thread() || thread() != QThread::currentThread()) {
        qWarning("QObject::startTimer: timers cannot be started from another thread");
        return;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    d->timerList.registerTimer(timerId, interval, obj);
}

select()

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

protectedvirtual

Reimplemented in QEventDispatcherQPA, QEventDispatcherQWS, QEventDispatcherX11, and QEventDispatcherBlackberry.

Definition at line 646 of file qeventdispatcher_unix.cpp.

Referenced by QEventDispatcherQPA::select(), QEventDispatcherX11::select(), and QEventDispatcherQWS::select().

{
    return qt_safe_select(nfds, readfds, writefds, exceptfds, timeout);
}

setSocketNotifierPending()

void QEventDispatcherUNIX::setSocketNotifierPending ( QSocketNotifier *  notifier )

protected

Definition at line 831 of file qeventdispatcher_unix.cpp.

{
    Q_ASSERT(notifier);
    int sockfd = notifier->socket();
    int type = notifier->type();
#ifndef QT_NO_DEBUG
    if (sockfd < 0
        || unsigned(sockfd) >= FD_SETSIZE) {
        qWarning("QSocketNotifier: Internal error");
        return;
    }
    Q_ASSERT(notifier->thread() == thread() && thread() == QThread::currentThread());
#endif

    Q_D(QEventDispatcherUNIX);
    QSockNotType::List &list = d->sn_vec[type].list;
    QSockNot *sn = 0;
    int i;
    for (i = 0; i < list.size(); ++i) {
        sn = list[i];
        if(sn->obj == notifier && sn->fd == sockfd)
            break;
    }
    if (i == list.size()) // not found
        return;

    // We choose a random activation order to be more fair under high load.
    // If a constant order is used and a peer early in the list can
    // saturate the IO, it might grab our attention completely.
    // Also, if we're using a straight list, the callback routines may
    // delete other entries from the list before those other entries are
    // processed.
    if (! FD_ISSET(sn->fd, sn->queue)) {
        if (d->sn_pending_list.isEmpty()) {
            d->sn_pending_list.append(sn);
        } else {
            d->sn_pending_list.insert((qrand() & 0xff) %
                                      (d->sn_pending_list.size()+1), sn);
        }
        FD_SET(sn->fd, sn->queue);
    }
}

unregisterSocketNotifier()

void QEventDispatcherUNIX::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.

Reimplemented in QEventDispatcherQPA.

Definition at line 785 of file qeventdispatcher_unix.cpp.

Referenced by QEventDispatcherBlackberry::unregisterSocketNotifier(), and QEventDispatcherQPA::unregisterSocketNotifier().

{
    Q_ASSERT(notifier);
    int sockfd = notifier->socket();
    int type = notifier->type();
#ifndef QT_NO_DEBUG
    if (sockfd < 0
        || unsigned(sockfd) >= FD_SETSIZE) {
        qWarning("QSocketNotifier: Internal error");
        return;
    } else if (notifier->thread() != thread()
               || thread() != QThread::currentThread()) {
        qWarning("QSocketNotifier: socket notifiers cannot be disabled from another thread");
        return;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    QSockNotType::List &list = d->sn_vec[type].list;
    fd_set *fds  =  &d->sn_vec[type].enabled_fds;
    QSockNot *sn = 0;
    int i;
    for (i = 0; i < list.size(); ++i) {
        sn = list[i];
        if(sn->obj == notifier && sn->fd == sockfd)
            break;
    }
    if (i == list.size()) // not found
        return;

    FD_CLR(sockfd, fds);                        // clear fd bit
    FD_CLR(sockfd, sn->queue);
    d->sn_pending_list.removeAll(sn);                // remove from activation list
    list.removeAt(i);                                // remove notifier found above
    delete sn;

    if (d->sn_highest == sockfd) {                // find highest fd
        d->sn_highest = -1;
        for (int i=0; i<3; i++) {
            if (!d->sn_vec[i].list.isEmpty())
                d->sn_highest = qMax(d->sn_highest,  // list is fd-sorted
                                     d->sn_vec[i].list[0]->fd);
        }
    }
}

unregisterTimer()

bool QEventDispatcherUNIX::unregisterTimer ( int  timerId )

virtual

Warning

This function is not part of the public interface.

Implements QAbstractEventDispatcher.

Definition at line 674 of file qeventdispatcher_unix.cpp.

{
#ifndef QT_NO_DEBUG
    if (timerId < 1) {
        qWarning("QEventDispatcherUNIX::unregisterTimer: invalid argument");
        return false;
    } else if (thread() != QThread::currentThread()) {
        qWarning("QObject::killTimer: timers cannot be stopped from another thread");
        return false;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    return d->timerList.unregisterTimer(timerId);
}

unregisterTimers()

bool QEventDispatcherUNIX::unregisterTimers ( QObject *  object )

virtual

Warning

This function is not part of the public interface.

Implements QAbstractEventDispatcher.

Definition at line 693 of file qeventdispatcher_unix.cpp.

{
#ifndef QT_NO_DEBUG
    if (!object) {
        qWarning("QEventDispatcherUNIX::unregisterTimers: invalid argument");
        return false;
    } else if (object->thread() != thread() || thread() != QThread::currentThread()) {
        qWarning("QObject::killTimers: timers cannot be stopped from another thread");
        return false;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    return d->timerList.unregisterTimers(object);
}

wakeUp()

void QEventDispatcherUNIX::wakeUp ( )

virtual

Wakes up the event loop.

Note

This class or function is threadsafe.

See also

awake()

Implements QAbstractEventDispatcher.

Definition at line 953 of file qeventdispatcher_unix.cpp.

Referenced by interrupt(), QEventDispatcherQPA::registerSocketNotifier(), and QEventDispatcherQPA::unregisterSocketNotifier().

{
    Q_D(QEventDispatcherUNIX);
    if (d->wakeUps.testAndSetAcquire(0, 1)) {
        char c = 0;
        qt_safe_write( d->thread_pipe[1], &c, 1 );
    }
}

---

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

• /src/corelib/kernel/qeventdispatcher_unix_p.h
• /src/corelib/kernel/qeventdispatcher_unix.cpp