Avoid locking and search on the global hash if there is no QPointer

As less than 10% of the object have QPointers, we can avoid locking if
we know there is no QPointer.  And keeping track of which object has a
QPointer is easy.

Reviewed-by: Brad

1 files changed, 2 insertions, 1 deletions

diff --git a/src/corelib/kernel/qobject.h b/src/corelib/kernel/qobject.h
index dbec0a6..b1f41ad 100644
--- a/src/corelib/kernel/qobject.h
+++ b/src/corelib/kernel/qobject.h
@@ -106,7 +106,8 @@ public:
     uint receiveChildEvents : 1;
     uint inEventHandler : 1;
     uint inThreadChangeEvent : 1;
-    uint unused : 23;
+    uint hasGuards : 1; //true iff there is one or more QPointer attached to this object
+    uint unused : 22;
     int postedEvents;
 };