Extracted cleanup from QCoreApplication::exec() into separate function

Not all Qt integration points can call QCoreApplication::exec(), in
particular, ActiveQt. When an ActiveQt server is loaded, it tries to
mimic the behavior of calling QCoreApplication::exec() by setting
QCoreApplicationPrivate::in_exec = true. However, when unloading the
DLL it is necessary to call the same clean-up (e.g. deferred delete)
that QCoreApplication::exec() does. Extracting the cleanup in a separate
function means implementation does not have to be duplicated.

Task-number: QTBUG-56172
Change-Id: I061f1c06f38881032ad7044416c12c91e536478a
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/kernel/qcoreapplication.cpp

@@ -1260,18 +1260,30 @@ int QCoreApplication::exec()
     self->d_func()->aboutToQuitEmitted = false;
     int returnCode = eventLoop.exec();
     threadData->quitNow = false;
-    if (self) {
-        self->d_func()->in_exec = false;
-        if (!self->d_func()->aboutToQuitEmitted)
-            emit self->aboutToQuit(QPrivateSignal());
-        self->d_func()->aboutToQuitEmitted = true;
-        sendPostedEvents(0, QEvent::DeferredDelete);
-    }
+
+    if (self)
+        self->d_func()->execCleanup();
 
     return returnCode;
 }
 
 
+// Cleanup after eventLoop is done executing in QCoreApplication::exec().
+// This is for use cases in which QCoreApplication is instantiated by a
+// library and not by an application executable, for example, Active X
+// servers.
+
+void QCoreApplicationPrivate::execCleanup()
+{
+    threadData->quitNow = false;
+    in_exec = false;
+    if (!aboutToQuitEmitted)
+        emit q_func()->aboutToQuit(QCoreApplication::QPrivateSignal());
+    aboutToQuitEmitted = true;
+    QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete);
+}
+
+
 /*!
   Tells the application to exit with a return code.
 

src/corelib/kernel/qcoreapplication_p.h

@@ -145,6 +145,8 @@ public:
     static inline void clearApplicationFilePath() { delete cachedApplicationFilePath; cachedApplicationFilePath = 0; }
 
 #ifndef QT_NO_QOBJECT
+    void execCleanup();
+
     bool in_exec;
     bool aboutToQuitEmitted;
     bool threadData_clean;