From 59a3dd2383829b5794704065cfbe535b70e8f0ad Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 24 Jun 2010 16:20:32 +0000
Subject: clear activation_sets component of Graph, thus restoring full Route
 deletion

git-svn-id: svn://localhost/ardour2/branches/3.0@7298 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/ardour/graph.h |  5 +++--
 libs/ardour/graph.cc       | 39 +++++++++++++++++++++++++++++++++++----
 libs/ardour/session.cc     | 11 +++++++----
 3 files changed, 45 insertions(+), 10 deletions(-)

diff --git a/libs/ardour/ardour/graph.h b/libs/ardour/ardour/graph.h
index f38ef12721..a6863fc86b 100644
--- a/libs/ardour/ardour/graph.h
+++ b/libs/ardour/ardour/graph.h
@@ -81,6 +81,8 @@ class Graph : public SessionHandleRef
 
 	void process_one_route (Route * route);
 
+        void clear_other_chain ();
+
     protected:
         virtual void session_going_away ();
 
@@ -95,11 +97,10 @@ class Graph : public SessionHandleRef
 	std::vector<GraphNode *> _trigger_queue;
 	pthread_mutex_t _trigger_mutex;
 
-
 	sem_t _execution_sem;
-
 	sem_t _callback_start_sem;
 	sem_t _callback_done_sem;
+	sem_t _cleanup_sem;
 
 	volatile gint _execution_tokens;
 	volatile gint _finished_refcount;
diff --git a/libs/ardour/graph.cc b/libs/ardour/graph.cc
index 5b6a42437b..dd56cb9880 100644
--- a/libs/ardour/graph.cc
+++ b/libs/ardour/graph.cc
@@ -17,7 +17,7 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
 */
-
+#include <iostream>
 #include <stdio.h>
 #include <cmath>
 
@@ -38,6 +38,7 @@
 
 using namespace ARDOUR;
 using namespace PBD;
+using namespace std;
 
 
 Graph::Graph (Session & session) 
@@ -48,6 +49,7 @@ Graph::Graph (Session & session)
 
         sem_init( &_callback_start_sem, 0, 0 );
         sem_init( &_callback_done_sem,  0, 0 );
+        sem_init( &_cleanup_sem,  0, 0 );
 
         _execution_tokens = 0;
 
@@ -100,7 +102,7 @@ Graph::session_going_away()
 
         sem_post( &_callback_start_sem);
 
-        for (std::list<pthread_t>::iterator i = _thread_list.begin(); i != _thread_list.end(); i++) {
+        for (list<pthread_t>::iterator i = _thread_list.begin(); i != _thread_list.end(); i++) {
                 void* status;
                 pthread_join (*i, &status);
         }
@@ -113,6 +115,33 @@ Graph::session_going_away()
         _trigger_queue.clear();
 }
 
+void
+Graph::clear_other_chain ()
+{
+        while (1) {
+                pthread_mutex_lock (&_swap_mutex);
+                if (_setup_chain != _pending_chain) {
+
+                        for (node_list_t::iterator ni=_nodes_rt[_setup_chain].begin(); ni!=_nodes_rt[_setup_chain].end(); ni++) {
+                                (*ni)->_activation_set[_setup_chain].clear();
+                        }
+
+                        _nodes_rt[_setup_chain].clear ();
+                        _init_trigger_list[_setup_chain].clear ();
+                        pthread_mutex_unlock (&_swap_mutex);
+
+                        return;
+                }
+                pthread_mutex_unlock (&_swap_mutex);
+                /* setup chain == pending chain - we have
+                   to wait till this is no longer true.
+                */
+                cerr << "Wait for setup != pending (currently " << _setup_chain << '/' << _pending_chain << endl;
+                int ret = sem_wait (&_cleanup_sem);
+                cerr << " back from that wait, ret = " << ret << endl;
+        }
+}
+
 void
 Graph::prep()
 {
@@ -123,9 +152,11 @@ Graph::prep()
                 // we got the swap mutex.
                 if (_current_chain != _pending_chain)
                 {
-                        //printf ("chain swap ! %d -> %d\n", _current_chain, _pending_chain);
+                        printf ("chain swap ! %d -> %d\n", _current_chain, _pending_chain);
                         _setup_chain = _current_chain;
                         _current_chain = _pending_chain;
+                        printf ("\tNOW: setup %d current %d pending %d\n", _setup_chain, _current_chain, _pending_chain);
+                        sem_post (&_cleanup_sem);
                 }
                 pthread_mutex_unlock (&_swap_mutex);
         }
@@ -295,7 +326,7 @@ Graph::run_one()
                 to_run = 0;
         }
 
-        int wakeup = std::min ((int) _execution_tokens, (int) _trigger_queue.size());
+        int wakeup = min ((int) _execution_tokens, (int) _trigger_queue.size());
         _execution_tokens -= wakeup;
 
         for (int i=0; i<wakeup; i++ ) {
diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 94945b95c2..7a4a4c4e9f 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -1317,9 +1317,7 @@ Session::resort_routes ()
 		return;
 	}
 
-
 	{
-
 		RCUWriter<RouteList> writer (routes);
 		shared_ptr<RouteList> r = writer.get_copy ();
 		resort_routes_using (r);
@@ -1381,7 +1379,7 @@ Session::resort_routes_using (shared_ptr<RouteList> r)
 	RouteSorter cmp;
 	r->sort (cmp);
 
-	route_graph->rechain( r );
+	route_graph->rechain (r);
 
 #ifndef NDEBUG
         DEBUG_TRACE (DEBUG::Graph, "Routes resorted, order follows:\n");
@@ -2081,7 +2079,7 @@ Session::remove_route (shared_ptr<Route> route)
 
 		/* writer goes out of scope, forces route list update */
 	}
-        
+
         update_route_solo_state ();
 	update_session_range_location_marker ();
 
@@ -2105,6 +2103,11 @@ Session::remove_route (shared_ptr<Route> route)
 	update_latency_compensation (false, false);
 	set_dirty();
 
+        /* flush references out of the graph
+         */
+
+        route_graph->clear_other_chain ();
+
 	/* get rid of it from the dead wood collection in the route list manager */
 
 	/* XXX i think this is unsafe as it currently stands, but i am not sure. (pd, october 2nd, 2006) */
-- 
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