diff options
author | Bradley T. Hughes <bradley.hughes@nokia.com> | 2012-05-14 13:27:28 +0200 |
---|---|---|
committer | Qt by Nokia <qt-info@nokia.com> | 2012-06-05 06:14:16 +0200 |
commit | 9b07fd0d5cae6846f0eaccf3dc51bc9e78559a05 (patch) | |
tree | a248572b50724dcd8b5cfe0f3f94edc81a8d0db8 /src | |
parent | 00f88bd0902c852c334903d7437cb0f6e399471d (diff) |
Add QDeferredDeleteEvent
Use this to store the loop-level counter needed by QCoreApplication
when determining when it is safe to delete an object.
This removes the hack to hijack the QEvent::d pointer (even though
the pointer is unused).
Change-Id: I91c0b1aa00235ec6e13feb30bf928e56d2f80026
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src')
-rw-r--r-- | src/corelib/kernel/qcoreapplication.cpp | 15 | ||||
-rw-r--r-- | src/corelib/kernel/qcoreevent.cpp | 22 | ||||
-rw-r--r-- | src/corelib/kernel/qcoreevent.h | 11 | ||||
-rw-r--r-- | src/corelib/kernel/qobject.cpp | 2 |
4 files changed, 38 insertions, 12 deletions
diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp index 53f6b1f57f..e714067cb3 100644 --- a/src/corelib/kernel/qcoreapplication.cpp +++ b/src/corelib/kernel/qcoreapplication.cpp @@ -1105,13 +1105,7 @@ void QCoreApplication::postEvent(QObject *receiver, QEvent *event, int priority) if (event->type() == QEvent::DeferredDelete && data == QThreadData::current()) { // remember the current running eventloop for DeferredDelete // events posted in the receiver's thread - - // check that QEvent's d pointer is unused before we store the loop level - // if further updates to QEvent have made the use of the d pointer necessary, - // then update this code to store the loop level somewhere else - Q_ASSERT_X(event->d == 0, "QCoreApplication::postEvent", - "Internal error: this code relies on QEvent::d being null"); - event->d = reinterpret_cast<QEventPrivate *>(quintptr(data->loopLevel)); + static_cast<QDeferredDeleteEvent *>(event)->level = data->loopLevel; } // delete the event on exceptions to protect against memory leaks till the event is @@ -1280,11 +1274,12 @@ void QCoreApplicationPrivate::sendPostedEvents(QObject *receiver, int event_type // DeferredDelete events are only sent when we are explicitly asked to // (s.a. QEvent::DeferredDelete), and then only if the event loop that // posted the event has returned. + int loopLevel = static_cast<QDeferredDeleteEvent *>(pe.event)->loopLevel(); const bool allowDeferredDelete = - (quintptr(pe.event->d) > unsigned(data->loopLevel) - || (!quintptr(pe.event->d) && data->loopLevel > 0) + (loopLevel > data->loopLevel + || (!loopLevel && data->loopLevel > 0) || (event_type == QEvent::DeferredDelete - && quintptr(pe.event->d) == unsigned(data->loopLevel))); + && loopLevel == data->loopLevel)); if (!allowDeferredDelete) { // cannot send deferred delete if (!event_type && !receiver) { diff --git a/src/corelib/kernel/qcoreevent.cpp b/src/corelib/kernel/qcoreevent.cpp index 1e3f8a2fee..5231f813f4 100644 --- a/src/corelib/kernel/qcoreevent.cpp +++ b/src/corelib/kernel/qcoreevent.cpp @@ -116,7 +116,7 @@ QT_BEGIN_NAMESPACE \value ContentsRectChange The margins of the widget's content rect changed. \value ContextMenu Context popup menu (QContextMenuEvent). \value CursorChange The widget's cursor has changed. - \value DeferredDelete The object will be deleted after it has cleaned up. + \value DeferredDelete The object will be deleted after it has cleaned up (QDeferredDeleteEvent). \value DragEnter The cursor enters a widget during a drag and drop operation (QDragEnterEvent). \value DragLeave The cursor leaves a widget during a drag and drop operation (QDragLeaveEvent). \value DragMove A drag and drop operation is in progress (QDragMoveEvent). @@ -580,4 +580,24 @@ QDynamicPropertyChangeEvent::~QDynamicPropertyChangeEvent() \sa QObject::setProperty(), QObject::dynamicPropertyNames() */ +/*! + Constructs a deferred delete event with an initial loopLevel() of zero. +*/ +QDeferredDeleteEvent::QDeferredDeleteEvent() + : QEvent(QEvent::DeferredDelete) + , level(0) +{ } + +/*! \internal */ +QDeferredDeleteEvent::~QDeferredDeleteEvent() +{ } + +/*! \fn int QDeferredDeleteEvent::loopLevel() const + + Returns the loop-level in which the event was posted. The + loop-level is set by QCoreApplication::postEvent(). + + \sa QObject::deleteLater() +*/ + QT_END_NAMESPACE diff --git a/src/corelib/kernel/qcoreevent.h b/src/corelib/kernel/qcoreevent.h index 177fc26933..1af426e5d2 100644 --- a/src/corelib/kernel/qcoreevent.h +++ b/src/corelib/kernel/qcoreevent.h @@ -360,6 +360,17 @@ private: QByteArray n; }; +class Q_CORE_EXPORT QDeferredDeleteEvent : public QEvent +{ +public: + explicit QDeferredDeleteEvent(); + ~QDeferredDeleteEvent(); + int loopLevel() const { return level; } +private: + int level; + friend class QCoreApplication; +}; + QT_END_NAMESPACE QT_END_HEADER diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp index d6793e7568..de6f2be98f 100644 --- a/src/corelib/kernel/qobject.cpp +++ b/src/corelib/kernel/qobject.cpp @@ -1907,7 +1907,7 @@ void QObject::removeEventFilter(QObject *obj) */ void QObject::deleteLater() { - QCoreApplication::postEvent(this, new QEvent(QEvent::DeferredDelete)); + QCoreApplication::postEvent(this, new QDeferredDeleteEvent()); } /*! |