handle deletion of UI objects between the time that a callback is queued with the...

[ardour.git] / libs / pbd / pbd / event_loop.h

diff --git a/libs/pbd/pbd/event_loop.h b/libs/pbd/pbd/event_loop.h
index be98fcd852a771a5d43b5b19ae44a05ae1ed05e4..088b061826f413da2b29aada42971e2a1de3a8ef 100644 (file)
--- a/libs/pbd/pbd/event_loop.h
+++ b/libs/pbd/pbd/event_loop.h
@@ -33,7 +33,34 @@ class EventLoop
        EventLoop() {}
        virtual ~EventLoop() {}
 
-       virtual void call_slot (const boost::function<void()>&) = 0;
+       enum RequestType {
+               range_guarantee = ~0
+       };
+
+        struct BaseRequestObject;
+    
+        struct InvalidationRecord {
+            BaseRequestObject* request;
+            PBD::EventLoop* event_loop;
+            const char* file;
+            int line;
+
+            InvalidationRecord() : request (0), event_loop (0) {}
+        };
+
+        static void* invalidate_request (void* data);
+
+       struct BaseRequestObject {
+           RequestType             type;
+            bool                    valid;
+            InvalidationRecord*     invalidation;
+           boost::function<void()> the_slot;
+            
+            BaseRequestObject() : valid (true), invalidation (0) {}
+       };
+
+       virtual void call_slot (InvalidationRecord*, const boost::function<void()>&) = 0;
+        virtual Glib::Mutex& slot_invalidation_mutex() = 0;
 
        static EventLoop* get_event_loop_for_thread();
        static void set_event_loop_for_thread (EventLoop* ui);
@@ -45,4 +72,6 @@ class EventLoop
 
 }
 
+#define MISSING_INVALIDATOR 0 // used to mark places where we fail to provide an invalidator
+
 #endif /* __pbd_event_loop_h__ */