Details
-
Bug
-
Resolution: Done
-
P4: Low
-
5.2.0
-
None
-
Windows 7 x64
Description
Calling QAbstractEventDispatcher::instance()->hasPendingEvents() inside of a thread works just fine. However, outside of it (with parameter = new _thread), function always returns false.
Here is a complete code:
#include <QApplication>
#include <QAbstractEventDispatcher>
#include <QThread>
#include <QDebug>
bool hasPendingEvents(QThread *thread = 0) {
return QAbstractEventDispatcher::instance(thread)->hasPendingEvents();
}
bool hasPendingEvents2(QThread *thread) {
return thread->eventDispatcher()->hasPendingEvents();
}
class MyObject: public QObject {
Q_OBJECT
public slots:
void Run() {
qDebug() << __LINE__ << hasPendingEvents() << hasPendingEvents2(thread()) << QCoreApplication::hasPendingEvents();
QThread::sleep(2);
}
};
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
QThread thread;
MyObject object;
object.moveToThread(&thread);
thread.start();
for (int i = 0; i<2; ++i) QMetaObject::invokeMethod(&object, "Run", Qt::QueuedConnection);
/* For some reason, without a little sleep hasPendingEvents2()
will crash app because of "read access violation at 0x0". */
QThread::sleep(1);
qDebug() << __LINE__ << hasPendingEvents(&thread) << hasPendingEvents2(&thread);
return app.exec();
}
#include "main.moc"
Output:
20 true true true 39 false false 20 false false false