X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fpbd%2Fpbd%2Fevent_loop.h;h=450bf5752fcbc04cc0983baa6162d9a73abd17bd;hb=7a6e86c9f9bef8db74b755db659794c4a859f36d;hp=be98fcd852a771a5d43b5b19ae44a05ae1ed05e4;hpb=f450df300c9c057141a4caf79ff6dbfbf58492d9;p=ardour.git

diff --git a/libs/pbd/pbd/event_loop.h b/libs/pbd/pbd/event_loop.h
index be98fcd852..450bf5752f 100644
--- a/libs/pbd/pbd/event_loop.h
+++ b/libs/pbd/pbd/event_loop.h
@@ -27,13 +27,49 @@
 namespace PBD
 {
 
+/** An EventLoop is as basic abstraction designed to be used with any "user
+ * interface" (not necessarily graphical) that needs to wait on
+ * events/requests and dispatch/process them as they arrive.
+ *
+ * This is a very basic class that doesn't by itself provide an actual
+ * event loop or thread. See BaseUI for the "real" object to be used
+ * when something like this is needed (it inherits from EventLoop).
+ */
+
 class EventLoop 
 {
   public:
 	EventLoop() {}
 	virtual ~EventLoop() {}
 
-	virtual void call_slot (const boost::function<void()>&) = 0;
+	enum RequestType {
+		range_guarantee = ~0
+	};
+
+        struct BaseRequestObject;
+    
+        struct InvalidationRecord {
+	    std::list<BaseRequestObject*> requests;
+	    PBD::EventLoop* event_loop;
+	    const char* file;
+	    int line;
+
+	    InvalidationRecord() : 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 +81,6 @@ class EventLoop
 
 }
 
+#define MISSING_INVALIDATOR 0 // used to mark places where we fail to provide an invalidator
+
 #endif /* __pbd_event_loop_h__ */