libcamera: object: Notify objects of thread move

Send a synchronous message to objects just before they get moved to a
new thread. This allows the object to perform any required processing.
EventNotifier and Timer objects will use this mechanism to move
themselves to the new thread's event disaptcher.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

include/libcamera/object.h

@@ -52,6 +52,8 @@ private:
 
 	void invokeMethod(BoundMethodBase *method, void *pack);
 
+	void notifyThreadMove();
+
 	void connect(SignalBase *signal);
 	void disconnect(SignalBase *signal);