1 files changed, 39 insertions, 34 deletions

diff --git a/src/corelib/kernel/qmetaobject.cpp b/src/corelib/kernel/qmetaobject.cpp
index 9854e68bca..ceb2a9c9c8 100644
--- a/src/corelib/kernel/qmetaobject.cpp
+++ b/src/corelib/kernel/qmetaobject.cpp
@@ -266,7 +266,25 @@ QObject *QMetaObject::cast(QObject *obj) const
         const QMetaObject *m = obj->metaObject();
         do {
             if (m == this)
-                return const_cast<QObject*>(obj);
+                return obj;
+        } while ((m = m->d.superdata));
+    }
+    return 0;
+}
+
+/*!
+    \internal
+
+    Returns \a obj if object \a obj inherits from this
+    meta-object; otherwise returns 0.
+*/
+const QObject *QMetaObject::cast(const QObject *obj) const
+{
+    if (obj) {
+        const QMetaObject *m = obj->metaObject();
+        do {
+            if (m == this)
+                return obj;
         } while ((m = m->d.superdata));
     }
     return 0;
@@ -1558,6 +1576,12 @@ bool QMetaMethod::invoke(QObject *object,
                          : Qt::QueuedConnection;
     }
 
+#ifdef QT_NO_THREAD
+    if (connectionType == Qt::BlockingQueuedConnection) {
+        connectionType = Qt::DirectConnection;
+    }
+#endif
+
     // invoke!
     void *param[] = {
         returnValue.data(),
@@ -1576,7 +1600,7 @@ bool QMetaMethod::invoke(QObject *object,
     int methodIndex = ((handle - priv(mobj->d.data)->methodData) / 5) + mobj->methodOffset();
     if (connectionType == Qt::DirectConnection) {
         return QMetaObject::metacall(object, QMetaObject::InvokeMetaMethod, methodIndex, param) < 0;
-    } else {
+    } else if (connectionType == Qt::QueuedConnection) {
         if (returnValue.data()) {
             qWarning("QMetaMethod::invoke: Unable to invoke methods with return values in "
                      "queued connections");
@@ -1609,40 +1633,21 @@ bool QMetaMethod::invoke(QObject *object,
             }
         }
 
-        if (connectionType == Qt::QueuedConnection) {
-            QCoreApplication::postEvent(object, new QMetaCallEvent(methodIndex,
-                                                                   0,
-                                                                   -1,
-                                                                   nargs,
-                                                                   types,
-                                                                   args));
-        } else {
-            if (currentThread == objectThread) {
-                qWarning("QMetaMethod::invoke: Dead lock detected in "
-                         "BlockingQueuedConnection: Receiver is %s(%p)",
-                         mobj->className(), object);
-            }
+        QCoreApplication::postEvent(object, new QMetaCallEvent(methodIndex,
+                                                        0, -1, nargs, types, args));
+    } else { // blocking queued connection
+#ifndef QT_NO_THREAD
+        if (currentThread == objectThread) {
+            qWarning("QMetaMethod::invoke: Dead lock detected in "
+                        "BlockingQueuedConnection: Receiver is %s(%p)",
+                        mobj->className(), object);
+        }
 
-            // blocking queued connection
-#ifdef QT_NO_THREAD
-            QCoreApplication::postEvent(object, new QMetaCallEvent(methodIndex,
-                                                                   0,
-                                                                   -1,
-                                                                   nargs,
-                                                                   types,
-                                                                   args));
-#else
-            QSemaphore semaphore;
-            QCoreApplication::postEvent(object, new QMetaCallEvent(methodIndex,
-                                                                   0,
-                                                                   -1,
-                                                                   nargs,
-                                                                   types,
-                                                                   args,
-                                                                   &semaphore));
-            semaphore.acquire();
+        QSemaphore semaphore;
+        QCoreApplication::postEvent(object, new QMetaCallEvent(methodIndex,
+                                                        0, -1, 0, 0, param, &semaphore));
+        semaphore.acquire();
 #endif // QT_NO_THREAD
-        }
     }
     return true;
 }