* Cleanup of some memory consuming items on ScenePresence.Close().

* Untangled a tangly shutdown loop for the ScenePresence.
* Suggested to the Garbage Collector that this may be a good time to >.>, <.< *gasp* collect the memory.

OpenSim/Region/ClientStack/ClientView.cs

@@ -267,7 +267,7 @@ namespace OpenSim.Region.ClientStack
             // We can't reach into other scenes and close the connection 
             // We need to do this over grid communications
             //m_scene.CloseAllAgents(CircuitCode);
-
+            GC.Collect();
             m_clientThread.Abort();
         }
 

OpenSim/Region/Environment/Scenes/Scene.cs

@@ -1479,7 +1479,13 @@ namespace OpenSim.Region.Environment.Scenes
                     m_sceneGridService.LogOffUser(agentID, RegionInfo.RegionID, RegionInfo.RegionHandle,
                                                 avatar.AbsolutePosition.X, avatar.AbsolutePosition.Y,
                                                 avatar.AbsolutePosition.Z);
-                    m_sceneGridService.SendCloseChildAgentConnections(avatar);
+                    List<ulong> childknownRegions = new List<ulong>();
+                    List<ulong> ckn = avatar.GetKnownRegionList();
+                    for (int i = 0; i < ckn.Count; i++)
+                    {
+                        childknownRegions.Add(ckn[i]);
+                    }
+                    m_sceneGridService.SendCloseChildAgentConnections(agentID, childknownRegions);
                 }
 
                 m_eventManager.TriggerClientClosed(agentID);
@@ -1554,6 +1560,22 @@ namespace OpenSim.Region.Environment.Scenes
             //m_log.InfoFormat("[SCENE] Memory pre  GC {0}", System.GC.GetTotalMemory(false));
             //m_log.InfoFormat("[SCENE] Memory post GC {0}", System.GC.GetTotalMemory(true));            
         }
+        public void HandleRemoveKnownRegionsFromAvatar(LLUUID avatarID, List<ulong> regionslst)
+        {
+            ScenePresence av = GetScenePresence(avatarID);
+            if (av != null)
+            {
+                lock (av)
+                {
+               
+                    for (int i = 0; i < regionslst.Count; i++)
+                    {
+                        av.KnownChildRegions.Remove(regionslst[i]);
+                    }
+                }
+            }
+
+        }
 
         public override void CloseAllAgents(uint circuitcode)
         {
@@ -1607,6 +1629,7 @@ namespace OpenSim.Region.Environment.Scenes
             m_sceneGridService.OnRegionUp += OtherRegionUp;
             m_sceneGridService.OnChildAgentUpdate += IncomingChildAgentDataUpdate;
             m_sceneGridService.OnExpectPrim += IncomingInterRegionPrimGroup;
+            m_sceneGridService.OnRemoveKnownRegionFromAvatar += HandleRemoveKnownRegionsFromAvatar;
 
 
 
@@ -1620,6 +1643,7 @@ namespace OpenSim.Region.Environment.Scenes
         /// </summary>
         public void UnRegisterReginWithComms()
         {
+            m_sceneGridService.OnRemoveKnownRegionFromAvatar -= HandleRemoveKnownRegionsFromAvatar;
             m_sceneGridService.OnExpectPrim -= IncomingInterRegionPrimGroup;
             m_sceneGridService.OnChildAgentUpdate -= IncomingChildAgentDataUpdate;
             m_sceneGridService.OnRegionUp -= OtherRegionUp;

OpenSim/Region/Environment/Scenes/SceneCommunicationService.cs

@@ -38,6 +38,8 @@ namespace OpenSim.Region.Environment.Scenes
 {
     public delegate void KillObjectDelegate(uint localID);
 
+    public delegate void RemoveKnownRegionsFromAvatarList(LLUUID avatarID, List<ulong> regionlst);
+
     public class SceneCommunicationService //one instance per region
     {
         private static readonly log4net.ILog m_log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
@@ -54,6 +56,7 @@ namespace OpenSim.Region.Environment.Scenes
         public event PrimCrossing OnPrimCrossingIntoRegion;
         public event RegionUp OnRegionUp;
         public event ChildAgentUpdate OnChildAgentUpdate;
+        public event RemoveKnownRegionsFromAvatarList OnRemoveKnownRegionFromAvatar;
         
 
 
@@ -393,23 +396,23 @@ namespace OpenSim.Region.Environment.Scenes
                           d);
         }
 
-        public delegate void SendCloseChildAgentDelegate( ScenePresence presence);
+        public delegate void SendCloseChildAgentDelegate( LLUUID agentID, List<ulong> regionlst);
 
         /// <summary>
         /// This Closes child agents on neighboring regions
         /// Calls an asynchronous method to do so..  so it doesn't lag the sim.
         /// </summary>
-        private void SendCloseChildAgentAsync(ScenePresence presence)
+        private void SendCloseChildAgentAsync(LLUUID agentID, List<ulong> regionlst)
         {
 
-            foreach (ulong regionHandle in presence.KnownChildRegions)
+            foreach (ulong regionHandle in regionlst)
             {
-                bool regionAccepted = m_commsProvider.InterRegion.TellRegionToCloseChildConnection(regionHandle, presence.ControllingClient.AgentId);
+                bool regionAccepted = m_commsProvider.InterRegion.TellRegionToCloseChildConnection(regionHandle, agentID);
 
                 if (regionAccepted)
                 {
                     m_log.Info("[INTERGRID]: Completed sending agent Close agent Request to neighbor");
-                    presence.RemoveNeighbourRegion(regionHandle);
+                    
                 }
                 else
                 {
@@ -418,6 +421,13 @@ namespace OpenSim.Region.Environment.Scenes
                 }
                 
             }
+            // We remove the list of known regions from the agent's known region list through an event
+            // to scene, because, if an agent logged of, it's likely that there will be no scene presence
+            // by the time we get to this part of the method.
+            if (OnRemoveKnownRegionFromAvatar != null)
+            {
+                OnRemoveKnownRegionFromAvatar(agentID,regionlst);
+            }
         }
 
         private void SendCloseChildAgentCompleted(IAsyncResult iar)
@@ -426,11 +436,11 @@ namespace OpenSim.Region.Environment.Scenes
             icon.EndInvoke(iar);
         }
 
-        public void SendCloseChildAgentConnections(ScenePresence presence)
+        public void SendCloseChildAgentConnections(LLUUID agentID, List<ulong> regionslst)
         {
             // This assumes that we know what our neighbors are.
             SendCloseChildAgentDelegate d = SendCloseChildAgentAsync;
-            d.BeginInvoke(presence,
+            d.BeginInvoke(agentID, regionslst,
                           SendCloseChildAgentCompleted,
                           d);
         }
@@ -522,7 +532,7 @@ namespace OpenSim.Region.Environment.Scenes
                         uint oldRegionY = (((uint)(m_regionInfo.RegionHandle)) >> 8);
                         if (Util.fast_distance2d((int)(newRegionX - oldRegionX), (int)(newRegionY - oldRegionY)) > 3)
                         {
-                            SendCloseChildAgentConnections(avatar);
+                            SendCloseChildAgentConnections(avatar.UUID,avatar.GetKnownRegionList());
                         }
                     }
                     else

OpenSim/Region/Environment/Scenes/ScenePresence.cs

@@ -617,6 +617,11 @@ namespace OpenSim.Region.Environment.Scenes
             }
         }
 
+        public List<ulong> GetKnownRegionList()
+        {
+            return m_knownChildRegions;
+        }
+
         #endregion
 
         #region Event Handlers
@@ -1767,7 +1772,25 @@ namespace OpenSim.Region.Environment.Scenes
 
         internal void Close()
         {
+            lock (m_knownPrimUUID)
+            {
+                m_knownPrimUUID.Clear();
+            }
+            lock (m_knownChildRegions)
+            {
+                m_knownChildRegions.Clear();
+            }
+            lock (m_updateTimes)
+            {
+                m_updateTimes.Clear();
+            }
+            lock (m_partsUpdateQueue)
+            {
+                m_partsUpdateQueue.Clear();
+            }
+
             RemoveFromPhysicalScene();
+            GC.Collect();
         }
     }
 }

OpenSim/Region/Environment/Types/UpdateQueue.cs

@@ -48,6 +48,17 @@ namespace OpenSim.Region.Environment.Types
             m_queue = new Queue<SceneObjectPart>();
             m_ids = new List<LLUUID>();
         }
+        public void Clear()
+        {
+            lock (m_ids)
+            {
+                m_ids.Clear();
+            }
+            lock (m_queue)
+            {
+                m_queue.Clear();
+            }
+        }
 
         public void Enqueue(SceneObjectPart part)
         {