Fix event delevery order
Some functions (such as QObject::moveToThread) did not keep the event ordered by priority. And because qUpperBound is used to add events, that mean new events would not be inserted in order. Task-number: QTBUG19637 Change-Id: I38eb9addb1cdd45b8566e000361ac6e5f1f2c2b8 Reviewed-on: http://codereview.qt.nokia.com/733 Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com> Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com> Reviewed-by: Olivier Goffart <olivier.goffart@nokia.com>
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@ -1272,20 +1272,7 @@ void QCoreApplication::postEvent(QObject *receiver, QEvent *event, int priority)
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// delete the event on exceptions to protect against memory leaks till the event is
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// properly owned in the postEventList
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QScopedPointer<QEvent> eventDeleter(event);
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if (data->postEventList.isEmpty() || data->postEventList.last().priority >= priority) {
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// optimization: we can simply append if the last event in
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// the queue has higher or equal priority
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data->postEventList.append(QPostEvent(receiver, event, priority));
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} else {
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// insert event in descending priority order, using upper
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// bound for a given priority (to ensure proper ordering
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// of events with the same priority)
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QPostEventList::iterator begin = data->postEventList.begin()
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+ data->postEventList.insertionOffset,
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end = data->postEventList.end();
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QPostEventList::iterator at = qUpperBound(begin, end, priority);
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data->postEventList.insert(at, QPostEvent(receiver, event, priority));
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}
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data->postEventList.addEvent(QPostEvent(receiver, event, priority));
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eventDeleter.take();
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event->posted = true;
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++receiver->d_func()->postedEvents;
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@ -1445,7 +1432,7 @@ void QCoreApplicationPrivate::sendPostedEvents(QObject *receiver, int event_type
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// cannot send deferred delete
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if (!event_type && !receiver) {
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// don't lose the event
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data->postEventList.append(pe);
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data->postEventList.addEvent(pe);
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const_cast<QPostEvent &>(pe).event = 0;
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}
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continue;
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@ -1482,7 +1482,7 @@ void QObjectPrivate::setThreadData_helper(QThreadData *currentData, QThreadData
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continue;
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if (pe.receiver == q) {
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// move this post event to the targetList
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targetData->postEventList.append(pe);
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targetData->postEventList.addEvent(pe);
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const_cast<QPostEvent &>(pe).event = 0;
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++eventsMoved;
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}
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@ -93,6 +93,8 @@ inline bool operator<(const QPostEvent &pe, int priority)
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return priority < pe.priority;
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}
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// This class holds the list of posted events.
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// The list has to be kept sorted by priority
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class QPostEventList : public QList<QPostEvent>
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{
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public:
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@ -109,6 +111,25 @@ public:
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inline QPostEventList()
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: QList<QPostEvent>(), recursion(0), startOffset(0), insertionOffset(0)
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{ }
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void addEvent(const QPostEvent &ev) {
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int priority = ev.priority;
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if (isEmpty() || last().priority >= priority) {
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// optimization: we can simply append if the last event in
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// the queue has higher or equal priority
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append(ev);
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} else {
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// insert event in descending priority order, using upper
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// bound for a given priority (to ensure proper ordering
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// of events with the same priority)
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QPostEventList::iterator at = qUpperBound(begin() + insertionOffset, end(), priority);
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insert(at, ev);
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}
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}
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private:
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//hides because they do not keep that list sorted. addEvent must be used
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using QList<QPostEvent>::append;
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using QList<QPostEvent>::insert;
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};
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#ifndef QT_NO_THREAD
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@ -1288,8 +1288,8 @@ bool QApplication::compressEvent(QEvent *event, QObject *receiver, QPostEventLis
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|| event->type() == QEvent::LanguageChange
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|| event->type() == QEvent::UpdateSoftKeys
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|| event->type() == QEvent::InputMethod)) {
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for (int i = 0; i < postedEvents->size(); ++i) {
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const QPostEvent &cur = postedEvents->at(i);
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for (QPostEventList::const_iterator it = postedEvents->constBegin(); it != postedEvents->constEnd(); ++it) {
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const QPostEvent &cur = *it;
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if (cur.receiver != receiver || cur.event == 0 || cur.event->type() != event->type())
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continue;
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if (cur.event->type() == QEvent::LayoutRequest
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@ -59,6 +59,8 @@
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#include <unistd.h>
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#endif
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#include "../../shared/util.h"
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//TESTED_CLASS=
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//TESTED_FILES=
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@ -208,6 +210,7 @@ private slots:
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void quit();
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void processEventsExcludeSocket();
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void processEventsExcludeTimers();
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void deliverInDefinedOrder_QTBUG19637();
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// keep this test last:
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void nestedLoops();
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@ -837,5 +840,77 @@ void tst_QEventLoop::symbianNestedActiveSchedulerLoop()
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#endif
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}
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Q_DECLARE_METATYPE(QThread*)
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namespace DeliverInDefinedOrder_QTBUG19637 {
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enum { NbThread = 3, NbObject = 500, NbEventQueue = 5, NbEvent = 50 };
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struct CustomEvent : public QEvent {
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CustomEvent(int q, int v) : QEvent(Type(User + q)), value(v) {}
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int value;
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};
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struct Object : public QObject {
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Q_OBJECT
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public:
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Object() : count(0) {
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for (int i = 0; i < NbEventQueue; i++)
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lastReceived[i] = -1;
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}
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int lastReceived[NbEventQueue];
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int count;
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virtual void customEvent(QEvent* e) {
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QVERIFY(e->type() >= QEvent::User);
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QVERIFY(e->type() < QEvent::User + 5);
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uint idx = e->type() - QEvent::User;
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int value = static_cast<CustomEvent *>(e)->value;
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QVERIFY(lastReceived[idx] < value);
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lastReceived[idx] = value;
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count++;
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}
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public slots:
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void moveToThread(QThread *t) {
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QObject::moveToThread(t);
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}
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};
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}
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void tst_QEventLoop::deliverInDefinedOrder_QTBUG19637()
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{
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using namespace DeliverInDefinedOrder_QTBUG19637;
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qMetaTypeId<QThread*>();
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QThread threads[NbThread];
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Object objects[NbObject];
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for (int t = 0; t < NbThread; t++) {
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threads[t].start();
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}
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int event = 0;
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for (int o = 0; o < NbObject; o++) {
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objects[o].moveToThread(&threads[o % NbThread]);
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for (int e = 0; e < NbEvent; e++) {
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int q = e % NbEventQueue;
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QCoreApplication::postEvent(&objects[o], new CustomEvent(q, ++event) , q);
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if (e % 7)
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QMetaObject::invokeMethod(&objects[o], "moveToThread", Qt::QueuedConnection, Q_ARG(QThread*, &threads[(e+o)%NbThread]));
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}
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}
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QTest::qWait(30);
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for (int o = 0; o < NbObject; o++) {
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QTRY_COMPARE(objects[o].count, int(NbEvent));
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}
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for (int t = 0; t < NbThread; t++) {
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threads[t].quit();
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threads[t].wait();
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}
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}
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QTEST_MAIN(tst_QEventLoop)
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#include "tst_qeventloop.moc"
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