/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtCore module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 as published by the Free Software Foundation** and appearing in the file LICENSE.GPL included in the packaging of** this file.  Please review the following information to ensure GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#include "qabstracteventdispatcher.h"#include "qabstracteventdispatcher_p.h"#include "qthread.h"#include <private/qthread_p.h>#include <private/qcoreapplication_p.h>static QBasicAtomic timerId = Q_ATOMIC_INIT(1);static int nextTimerId(){    register int id;    forever {        id = timerId;        if (timerId.testAndSet(id, id + 1))            break;    }    Q_ASSERT_X(id >= 1, "QTimer", "timer id overflow, please contact qt-bugs@trolltech.com");    return id;}void QAbstractEventDispatcherPrivate::init(){    Q_Q(QAbstractEventDispatcher);    if (threadData->eventDispatcher != 0) {        qWarning("QAbstractEventDispatcher: An event dispatcher has already been created for this thread");    } else {        threadData->eventDispatcher = q;    }}/*!    \class QAbstractEventDispatcher    \brief The QAbstractEventDispatcher class manages Qt's event queue, excluding GUI-related events.    \ingroup application    \ingroup events    An event dispatcher receives events from the window system and other    sources. It then sends them to the QCoreApplication or QApplication    instance for processing and delivery. QAbstractEventDispatcher provides    fine-grained control over event delivery.    For simple control of event processing use    QCoreApplication::processEvents().    For finer control of the application's event loop, call    instance() and call functions on the QAbstractEventDispatcher    object that is returned. If you want to use your own instance of    QAbstractEventDispatcher or of a QAbstractEventDispatcher    subclass, you must create your instance \e before you create the    QApplication object.    The main event loop is started by calling    QCoreApplication::exec(), and stopped by calling    QCoreApplication::exit(). Local event loops can be created using    QEventLoop.    Programs that perform long operations can call processEvents()    with a bitwise OR combination of various QEventLoop::ProcessEventsFlag    values to control which events should be delivered.    QAbstractEventDispatcher also allows the integration of an    external event loop with the Qt event loop. For example, the Motif    Extension included with Qt includes a reimplementation of    QAbstractEventDispatcher that merges Qt and Motif events together.    \sa QEventLoop, QCoreApplication*//*!    Constructs a new event dispatcher with the given \a parent.*/QAbstractEventDispatcher::QAbstractEventDispatcher(QObject *parent)    : QObject(*new QAbstractEventDispatcherPrivate, parent){    Q_D(QAbstractEventDispatcher);    d->init();}/*!    \internal*/QAbstractEventDispatcher::QAbstractEventDispatcher(QAbstractEventDispatcherPrivate &dd,                                                   QObject *parent)    : QObject(dd, parent){    Q_D(QAbstractEventDispatcher);    d->init();}/*!    Destroys the event dispatcher.*/QAbstractEventDispatcher::~QAbstractEventDispatcher(){ }/*!    Returns a pointer to the event dispatcher object for the specified    \a thread. If \a thread is zero, the current thread is used. If no    event dispatcher exists for the specified thread, this function    returns 0.    \bold{Note:} If Qt is built without thread support, the \a thread    argument is ignored. */QAbstractEventDispatcher *QAbstractEventDispatcher::instance(QThread *thread){    QThreadData *data = thread ? QThreadData::get2(thread) : QThreadData::current();    return data->eventDispatcher;}/*!    \fn bool QAbstractEventDispatcher::processEvents(QEventLoop::ProcessEventsFlags flags)    Processes pending events that match \a 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 \a flags, the    behavior of this function is as follows:    \list    \i If events are available, this function returns after processing    them.    \i If no events are available, this function will wait until more    are available and return after processing newly available events.    \endlist    If the QEventLoop::WaitForMoreEvents flag is not set in \a flags,    and no events are available, this function will return    immediately.    \bold{Note:} This function does not process events continuously; it    returns after all available events are processed.    \sa hasPendingEvents()*//*! \fn bool QAbstractEventDispatcher::hasPendingEvents()    Returns true if there is an event waiting; otherwise returns    false.*//*!    \fn void QAbstractEventDispatcher::registerSocketNotifier(QSocketNotifier *notifier)    Registers \a notifier with the event loop. Subclasses must    implement this method to tie a socket notifier into another    event loop.*//*! \fn void QAbstractEventDispatcher::unregisterSocketNotifier(QSocketNotifier *notifier)    Unregisters \a 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.*//*!    \fn int QAbstractEventDispatcher::registerTimer(int interval, QObject *object)    Registers a timer with the specified \a interval for the given \a object.*/int QAbstractEventDispatcher::registerTimer(int interval, QObject *object){    int id = nextTimerId();    registerTimer(id, interval, object);    return id;}/*!    \fn void QAbstractEventDispatcher::registerTimer(int timerId, int interval, QObject *object)    Register a timer with the specified \a timerId and \a interval for    the given \a object.*//*!    \fn bool QAbstractEventDispatcher::unregisterTimer(int timerId)    Unregisters the timer with the given \a timerId.    Returns true if successful; otherwise returns false.    \sa registerTimer(), unregisterTimers()*//*!    \fn bool QAbstractEventDispatcher::unregisterTimers(QObject *object)    Unregisters all the timers associated with the given \a object.    Returns true if all timers were successful removed; otherwise returns false.    \sa unregisterTimer(), registeredTimers()*//*!    \fn QList<TimerInfo> QAbstractEventDispatcher::registeredTimers(QObject *object) const    Returns a list of registered timers for \a object. The timer ID    is the first member in each pair; the interval is the second.*//*! \fn void QAbstractEventDispatcher::wakeUp()    \threadsafe    Wakes up the event loop.    \sa awake()*//*!    \fn void QAbstractEventDispatcher::interrupt()    Interrupts event dispatching; i.e. the event dispatcher will    return from processEvents() as soon as possible.*//*! \fn void QAbstractEventDispatcher::flush()    Flushes the event queue. This normally returns almost    immediately. Does nothing on platforms other than X11.*/// ### DOC: Are these called when the _application_ starts/stops or just// when the current _event loop_ starts/stops?/*! \internal */void QAbstractEventDispatcher::startingUp(){ }/*! \internal */void QAbstractEventDispatcher::closingDown(){ }/*!    \typedef QAbstractEventDispatcher::TimerInfo    Typedef for QPair<int, int>. The first component of    the pair is the timer ID; the second component is    the interval.    \sa registeredTimers()*//*!    \typedef QAbstractEventDispatcher::EventFilter    Typedef for a function with the signature    \code        bool myEventFilter(void *message);    \endcode    \sa setEventFilter(), filterEvent()*//*!    Sets the event filter \a filter. Returns a pointer to the filter    function previously defined.    The event filter is a function that receives all messages taken    from the system event loop before the event is dispatched to the    respective target. This includes messages that are not sent to Qt    objects.    The function can return true to stop the event to be processed by    Qt, or false to continue with the standard event processing.    Only one filter can be defined, but the filter can use the return    value to call the previously set event filter. By default, no    filter is set (i.e. the function returns 0).*/QAbstractEventDispatcher::EventFilter QAbstractEventDispatcher::setEventFilter(EventFilter filter){    Q_D(QAbstractEventDispatcher);    EventFilter oldFilter = d->event_filter;    d->event_filter = filter;    return oldFilter;}/*!    Sends \a message through the event filter that was set by    setEventFilter().  If no event filter has been set, this function    returns false; otherwise, this function returns the result of the    event filter function.    Subclasses of QAbstractEventDispatcher \e must call this function    for \e all messages received from the system to ensure    compatibility with any extensions that may be used in the    application.    \sa setEventFilter()*/bool QAbstractEventDispatcher::filterEvent(void *message){    Q_D(QAbstractEventDispatcher);    if (d->event_filter)        return d->event_filter(message);    return false;}/*! \fn void QAbstractEventDispatcher::awake()    This signal is emitted after the event loop returns from a    function that could block.    \sa wakeUp() aboutToBlock()*//*! \fn void QAbstractEventDispatcher::aboutToBlock()    This signal is emitted before the event loop calls a function that    could block.    \sa awake()*/