3 files changed, 50 insertions, 7 deletions

diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs b/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
index f99fa16..9189260 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
@@ -3598,14 +3598,30 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 EntityUpdate update;
                 while (updatesThisCall < maxUpdates && m_entityUpdates.TryDequeue(out update))
                 {
-                    // If we have sent a kill packet for this object
-                    // drop any updates on the floor
                     if (update.Entity is SceneObjectPart)
                     {
                         SceneObjectPart part = (SceneObjectPart)update.Entity;
                         if (m_killRecord.Contains(part.ParentGroup.RootPart.LocalId))
                             continue;
 
+                        // Please do not remove this unless you can demonstrate on the OpenSim mailing list that a client
+                        // will never receive an update after a prim kill.  Even then, keeping the kill record may be a good
+                        // safety measure.
+                        //
+                        // If a Linden Lab 1.23.5 client (and possibly later and earlier) receives an object update
+                        // after a kill, it will keep displaying the deleted object until relog.  OpenSim currently performs
+                        // updates and kills on different threads with different scheduling strategies, hence this protection.
+                        // 
+                        // This doesn't appear to apply to child prims - a client will happily ignore these updates
+                        // after the root prim has been deleted.
+                        if (m_killRecord.Contains(part.LocalId))
+                        {
+        //                        m_log.WarnFormat(
+        //                            "[CLIENT]: Preventing update for prim with local id {0} after client for user {1} told it was deleted",
+        //                            part.LocalId, Name);
+                            continue;
+                        }                        
+                        
                         if (part.ParentGroup.IsAttachment && m_disableFacelights)
                         {
                             if (part.ParentGroup.RootPart.Shape.State != (byte)AttachmentPoint.LeftHand &&
diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLUDPClient.cs b/OpenSim/Region/ClientStack/LindenUDP/LLUDPClient.cs
index ed0e60d..5aa9b40 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLUDPClient.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLUDPClient.cs
@@ -400,7 +400,16 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             return data;
         }
 
-        public bool EnqueueOutgoing(OutgoingPacket packet)
+        /// <summary>
+        /// Queue an outgoing packet if appropriate.
+        /// </summary>
+        /// <param name="packet"></param>
+        /// <param name="forceQueue">Always queue the packet if at all possible.</param>
+        /// <returns>
+        /// true if the packet has been queued, 
+        /// false if the packet has not been queued and should be sent immediately.
+        /// </returns>
+        public bool EnqueueOutgoing(OutgoingPacket packet, bool forceQueue)
         {
             int category = (int)packet.Category;
 
@@ -416,14 +425,14 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
                 TokenBucket bucket = m_throttleCategories[category];
 
-                if (bucket.RemoveTokens(packet.Buffer.DataLength))
+                if (!forceQueue && bucket.RemoveTokens(packet.Buffer.DataLength))
                 {
                     // Enough tokens were removed from the bucket, the packet will not be queued
                     return false;
                 }
                 else
                 {
-                    // Not enough tokens in the bucket, queue this packet
+                    // Force queue specified or not enough tokens in the bucket, queue this packet
                     queue.Enqueue(packet);
                     return true;
                 }
diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs b/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs
index ef0a178..6985449 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs
@@ -312,6 +312,13 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             }
         }
 
+        /// <summary>
+        /// Start the process of sending a packet to the client.
+        /// </summary>
+        /// <param name="udpClient"></param>
+        /// <param name="packet"></param>
+        /// <param name="category"></param>
+        /// <param name="allowSplitting"></param>
         public void SendPacket(LLUDPClient udpClient, Packet packet, ThrottleOutPacketType category, bool allowSplitting)
         {
             // CoarseLocationUpdate packets cannot be split in an automated way
@@ -339,6 +346,13 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             }
         }
 
+        /// <summary>
+        /// Start the process of sending a packet to the client.
+        /// </summary>
+        /// <param name="udpClient"></param>
+        /// <param name="data"></param>
+        /// <param name="type"></param>
+        /// <param name="category"></param>        
         public void SendPacketData(LLUDPClient udpClient, byte[] data, PacketType type, ThrottleOutPacketType category)
         {
             int dataLength = data.Length;
@@ -396,7 +410,11 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
             OutgoingPacket outgoingPacket = new OutgoingPacket(udpClient, buffer, category);
 
-            if (!outgoingPacket.Client.EnqueueOutgoing(outgoingPacket))
+            // If a Linden Lab 1.23.5 client receives an update packet after a kill packet for an object, it will 
+            // continue to display the deleted object until relog.  Therefore, we need to always queue a kill object
+            // packet so that it isn't sent before a queued update packet.
+            bool requestQueue = type == PacketType.KillObject;
+            if (!outgoingPacket.Client.EnqueueOutgoing(outgoingPacket, requestQueue))
                 SendPacketFinal(outgoingPacket);
 
             #endregion Queue or Send
@@ -489,7 +507,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                     //Interlocked.Increment(ref Stats.ResentPackets);
 
                     // Requeue or resend the packet
-                    if (!outgoingPacket.Client.EnqueueOutgoing(outgoingPacket))
+                    if (!outgoingPacket.Client.EnqueueOutgoing(outgoingPacket, false))
                         SendPacketFinal(outgoingPacket);
                 }
             }