@kshegunov Thanks. I can reproduce the same behavior with a single thread.
#include <QtCore>
struct Object: QObject{
Q_OBJECT
public slots:
void foo(){
qDebug() << __LINE__;
while(entered) qApp->processEvents();
qDebug() << __LINE__;
QEventLoop loop;
QTimer::singleShot(1000, &loop, SLOT(quit()));
entered = true;
loop.exec();
entered = false;
qDebug() << __LINE__;
}
private:
bool entered = false;
};
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
Object w;
QTimer::singleShot(0, &w, SLOT(foo()));
QTimer::singleShot(0, &w, SLOT(foo()));
QTimer::singleShot(3000, &a, SLOT(quit()));
a.exec();
qDebug() << __LINE__;
}
#include "main.moc"
In fact, it has nothing to do with multi-threads. I have never studied Qt source code. It seems exec will not return before all slots finish. So, the code actually creates a dead lock.
