1 files changed, 482 insertions, 268 deletions

diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs b/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs
index 004e20c..2ee8c07 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs
@@ -48,6 +48,9 @@ namespace OpenSim.Region.Framework.Scenes
         private string m_inventoryFileName = String.Empty;
         private byte[] m_inventoryFileData = new byte[0];
         private uint m_inventoryFileNameSerial = 0;
+        private bool m_inventoryPrivileged = false;
+
+        private Dictionary<UUID, ArrayList> m_scriptErrors = new Dictionary<UUID, ArrayList>();
         
         /// <value>
         /// The part to which the inventory belongs.
@@ -84,11 +87,14 @@ namespace OpenSim.Region.Framework.Scenes
         /// </value>
         protected internal TaskInventoryDictionary Items
         {
-            get { return m_items; }
+            get { 
+                return m_items; 
+            }
             set
             {
                 m_items = value;
                 m_inventorySerial++;
+                QueryScriptStates();
             }
         }
         
@@ -120,39 +126,45 @@ namespace OpenSim.Region.Framework.Scenes
         /// <param name="linkNum">Link number for the part</param>
         public void ResetInventoryIDs()
         {
-            if (null == m_part || null == m_part.ParentGroup)
-                return;
-            
-            lock (m_items)
+            m_items.LockItemsForWrite(true);
+
+            if (Items.Count == 0)
             {
-                if (0 == m_items.Count)
-                    return;
+                m_items.LockItemsForWrite(false);
+                return;
+            }
 
-                IList<TaskInventoryItem> items = GetInventoryItems();
-                m_items.Clear();
+            IList<TaskInventoryItem> items = new List<TaskInventoryItem>(Items.Values);
+            Items.Clear();
 
-                foreach (TaskInventoryItem item in items)
-                {
-                    item.ResetIDs(m_part.UUID);
-                    m_items.Add(item.ItemID, item);
-                }
+            foreach (TaskInventoryItem item in items)
+            {
+                item.ResetIDs(m_part.UUID);
+                Items.Add(item.ItemID, item);
             }
+            m_items.LockItemsForWrite(false);
         }
 
         public void ResetObjectID()
         {
-            lock (Items)
+            m_items.LockItemsForWrite(true);
+
+            if (Items.Count == 0)
             {
-                IList<TaskInventoryItem> items = new List<TaskInventoryItem>(Items.Values);
-                Items.Clear();
-    
-                foreach (TaskInventoryItem item in items)
-                {
-                    item.ParentPartID = m_part.UUID;
-                    item.ParentID = m_part.UUID;
-                    Items.Add(item.ItemID, item);
-                }
+                m_items.LockItemsForWrite(false);
+                return;
             }
+
+            IList<TaskInventoryItem> items = new List<TaskInventoryItem>(Items.Values);
+            Items.Clear();
+
+            foreach (TaskInventoryItem item in items)
+            {
+                item.ParentPartID = m_part.UUID;
+                item.ParentID = m_part.UUID;
+                Items.Add(item.ItemID, item);
+            }
+            m_items.LockItemsForWrite(false);
         }
 
         /// <summary>
@@ -161,12 +173,11 @@ namespace OpenSim.Region.Framework.Scenes
         /// <param name="ownerId"></param>
         public void ChangeInventoryOwner(UUID ownerId)
         {
-            lock (Items)
+            m_items.LockItemsForWrite(true);
+            if (0 == Items.Count)
             {
-                if (0 == Items.Count)
-                {
-                    return;
-                }
+                m_items.LockItemsForWrite(false);
+                return;
             }
 
             HasInventoryChanged = true;
@@ -180,6 +191,7 @@ namespace OpenSim.Region.Framework.Scenes
                     item.OwnerID = ownerId;
                 }
             }
+            m_items.LockItemsForWrite(false);
         }
 
         /// <summary>
@@ -188,12 +200,11 @@ namespace OpenSim.Region.Framework.Scenes
         /// <param name="groupID"></param>
         public void ChangeInventoryGroup(UUID groupID)
         {
-            lock (Items)
+            m_items.LockItemsForWrite(true);
+            if (0 == Items.Count)
             {
-                if (0 == Items.Count)
-                {
-                    return;
-                }
+                m_items.LockItemsForWrite(false);
+                return;
             }
 
             // Don't let this set the HasGroupChanged flag for attachments
@@ -205,12 +216,45 @@ namespace OpenSim.Region.Framework.Scenes
                 m_part.ParentGroup.HasGroupChanged = true;
             }
 
-            List<TaskInventoryItem> items = GetInventoryItems();
+            IList<TaskInventoryItem> items = new List<TaskInventoryItem>(Items.Values);
             foreach (TaskInventoryItem item in items)
             {
                 if (groupID != item.GroupID)
+                {
                     item.GroupID = groupID;
+                }
             }
+            m_items.LockItemsForWrite(false);
+        }
+
+        private void QueryScriptStates()
+        {
+            if (m_part == null || m_part.ParentGroup == null)
+                return;
+
+            IScriptModule[] engines = m_part.ParentGroup.Scene.RequestModuleInterfaces<IScriptModule>();
+            if (engines == null) // No engine at all
+                return;
+
+            Items.LockItemsForRead(true);
+            foreach (TaskInventoryItem item in Items.Values)
+            {
+                if (item.InvType == (int)InventoryType.LSL)
+                {
+                    foreach (IScriptModule e in engines)
+                    {
+                        bool running;
+
+                        if (e.HasScript(item.ItemID, out running))
+                        {
+                            item.ScriptRunning = running;
+                            break;
+                        }
+                    }
+                }
+            }
+
+            Items.LockItemsForRead(false);
         }
 
         /// <summary>
@@ -218,9 +262,14 @@ namespace OpenSim.Region.Framework.Scenes
         /// </summary>
         public void CreateScriptInstances(int startParam, bool postOnRez, string engine, int stateSource)
         {
-            List<TaskInventoryItem> scripts = GetInventoryScripts();
-            foreach (TaskInventoryItem item in scripts)
-                CreateScriptInstance(item, startParam, postOnRez, engine, stateSource);
+            Items.LockItemsForRead(true);
+            IList<TaskInventoryItem> items = new List<TaskInventoryItem>(Items.Values);
+            Items.LockItemsForRead(false);
+            foreach (TaskInventoryItem item in items)
+            {
+                if ((int)InventoryType.LSL == item.InvType)
+                    CreateScriptInstance(item, startParam, postOnRez, engine, stateSource);
+            }
         }
 
         public ArrayList GetScriptErrors(UUID itemID)
@@ -253,9 +302,18 @@ namespace OpenSim.Region.Framework.Scenes
         /// </param>
         public void RemoveScriptInstances(bool sceneObjectBeingDeleted)
         {
-            List<TaskInventoryItem> scripts = GetInventoryScripts();
-            foreach (TaskInventoryItem item in scripts)
-                RemoveScriptInstance(item.ItemID, sceneObjectBeingDeleted);
+            Items.LockItemsForRead(true);
+            IList<TaskInventoryItem> items = new List<TaskInventoryItem>(Items.Values);
+            Items.LockItemsForRead(false);
+
+            foreach (TaskInventoryItem item in items)
+            {
+                if ((int)InventoryType.LSL == item.InvType)
+                {
+                    RemoveScriptInstance(item.ItemID, sceneObjectBeingDeleted);
+                    m_part.RemoveScriptEvents(item.ItemID);
+                }
+            }
         }
 
         /// <summary>
@@ -271,7 +329,10 @@ namespace OpenSim.Region.Framework.Scenes
             //     item.Name, item.ItemID, Name, UUID);
 
             if (!m_part.ParentGroup.Scene.Permissions.CanRunScript(item.ItemID, m_part.UUID, item.OwnerID))
+            {
+                StoreScriptError(item.ItemID, "no permission");
                 return;
+            }
 
             m_part.AddFlag(PrimFlags.Scripted);
 
@@ -280,14 +341,13 @@ namespace OpenSim.Region.Framework.Scenes
                 if (stateSource == 2 && // Prim crossing
                         m_part.ParentGroup.Scene.m_trustBinaries)
                 {
-                    lock (m_items)
-                    {
-                        m_items[item.ItemID].PermsMask = 0;
-                        m_items[item.ItemID].PermsGranter = UUID.Zero;
-                    }
-                    
+                    m_items.LockItemsForWrite(true);
+                    m_items[item.ItemID].PermsMask = 0;
+                    m_items[item.ItemID].PermsGranter = UUID.Zero;
+                    m_items.LockItemsForWrite(false);
                     m_part.ParentGroup.Scene.EventManager.TriggerRezScript(
                         m_part.LocalId, item.ItemID, String.Empty, startParam, postOnRez, engine, stateSource);
+                    StoreScriptErrors(item.ItemID, null);
                     m_part.ParentGroup.AddActiveScriptCount(1);
                     m_part.ScheduleFullUpdate();
                     return;
@@ -296,6 +356,8 @@ namespace OpenSim.Region.Framework.Scenes
                 AssetBase asset = m_part.ParentGroup.Scene.AssetService.Get(item.AssetID.ToString());
                 if (null == asset)
                 {
+                    string msg = String.Format("asset ID {0} could not be found", item.AssetID);
+                    StoreScriptError(item.ItemID, msg);
                     m_log.ErrorFormat(
                         "[PRIM INVENTORY]: " +
                         "Couldn't start script {0}, {1} at {2} in {3} since asset ID {4} could not be found",
@@ -307,15 +369,20 @@ namespace OpenSim.Region.Framework.Scenes
                     if (m_part.ParentGroup.m_savedScriptState != null)
                         RestoreSavedScriptState(item.OldItemID, item.ItemID);
 
-                    lock (m_items)
-                    {
-                        m_items[item.ItemID].PermsMask = 0;
-                        m_items[item.ItemID].PermsGranter = UUID.Zero;
-                    }
+                    m_items.LockItemsForWrite(true);
+
+                    m_items[item.ItemID].PermsMask = 0;
+                    m_items[item.ItemID].PermsGranter = UUID.Zero;
+
+                    m_items.LockItemsForWrite(false);
                 
                     string script = Utils.BytesToString(asset.Data);
                     m_part.ParentGroup.Scene.EventManager.TriggerRezScript(
                         m_part.LocalId, item.ItemID, script, startParam, postOnRez, engine, stateSource);
+                    StoreScriptErrors(item.ItemID, null);
+                    if (!item.ScriptRunning)
+                        m_part.ParentGroup.Scene.EventManager.TriggerStopScript(
+                            m_part.LocalId, item.ItemID);
                     m_part.ParentGroup.AddActiveScriptCount(1);
                     m_part.ScheduleFullUpdate();
                 }
@@ -379,21 +446,145 @@ namespace OpenSim.Region.Framework.Scenes
 
         /// <summary>
         /// Start a script which is in this prim's inventory.
+        /// Some processing may occur in the background, but this routine returns asap.
         /// </summary>
         /// <param name="itemId">
         /// A <see cref="UUID"/>
         /// </param>
         public void CreateScriptInstance(UUID itemId, int startParam, bool postOnRez, string engine, int stateSource)
         {
-            TaskInventoryItem item = GetInventoryItem(itemId);
-            if (item != null)
-                CreateScriptInstance(item, startParam, postOnRez, engine, stateSource);
+            lock (m_scriptErrors)
+            {
+                // Indicate to CreateScriptInstanceInternal() we don't want it to wait for completion
+                m_scriptErrors.Remove(itemId);
+            }
+            CreateScriptInstanceInternal(itemId, startParam, postOnRez, engine, stateSource);
+        }
+
+        private void CreateScriptInstanceInternal(UUID itemId, int startParam, bool postOnRez, string engine, int stateSource)
+        {
+            m_items.LockItemsForRead(true);
+            if (m_items.ContainsKey(itemId))
+            {
+                if (m_items.ContainsKey(itemId))
+                {
+                    m_items.LockItemsForRead(false);
+                    CreateScriptInstance(m_items[itemId], startParam, postOnRez, engine, stateSource);
+                }
+                else
+                {
+                    m_items.LockItemsForRead(false);
+                    string msg = String.Format("couldn't be found for prim {0}, {1} at {2} in {3}", m_part.Name, m_part.UUID,
+                        m_part.AbsolutePosition, m_part.ParentGroup.Scene.RegionInfo.RegionName);
+                    StoreScriptError(itemId, msg);
+                    m_log.ErrorFormat(
+                        "[PRIM INVENTORY]: " +
+                        "Couldn't start script with ID {0} since it {1}", itemId, msg);
+                }
+            }
             else
+            {
+                m_items.LockItemsForRead(false);
+                string msg = String.Format("couldn't be found for prim {0}, {1}", m_part.Name, m_part.UUID);
+                StoreScriptError(itemId, msg);
                 m_log.ErrorFormat(
                     "[PRIM INVENTORY]: " +
-                    "Couldn't start script with ID {0} since it couldn't be found for prim {1}, {2} at {3} in {4}",
-                    itemId, m_part.Name, m_part.UUID, 
-                    m_part.AbsolutePosition, m_part.ParentGroup.Scene.RegionInfo.RegionName);
+                    "Couldn't start script with ID {0} since it {1}", itemId, msg);
+            }
+            
+        }
+
+        /// <summary>
+        /// Start a script which is in this prim's inventory and return any compilation error messages.
+        /// </summary>
+        /// <param name="itemId">
+        /// A <see cref="UUID"/>
+        /// </param>
+        public ArrayList CreateScriptInstanceEr(UUID itemId, int startParam, bool postOnRez, string engine, int stateSource)
+        {
+            ArrayList errors;
+
+            // Indicate to CreateScriptInstanceInternal() we want it to 
+            // post any compilation/loading error messages
+            lock (m_scriptErrors)
+            {
+                m_scriptErrors[itemId] = null;
+            }
+
+            // Perform compilation/loading
+            CreateScriptInstanceInternal(itemId, startParam, postOnRez, engine, stateSource);
+
+            // Wait for and retrieve any errors
+            lock (m_scriptErrors)
+            {
+                while ((errors = m_scriptErrors[itemId]) == null)
+                {
+                    if (!System.Threading.Monitor.Wait(m_scriptErrors, 15000))
+                    {
+                        m_log.ErrorFormat(
+                            "[PRIM INVENTORY]: " +
+                            "timedout waiting for script {0} errors", itemId);
+                        errors = m_scriptErrors[itemId];
+                        if (errors == null)
+                        {
+                            errors = new ArrayList(1);
+                            errors.Add("timedout waiting for errors");
+                        }
+                        break;
+                    }
+                }
+                m_scriptErrors.Remove(itemId);
+            }
+            return errors;
+        }
+
+        // Signal to CreateScriptInstanceEr() that compilation/loading is complete
+        private void StoreScriptErrors(UUID itemId, ArrayList errors)
+        {
+            lock (m_scriptErrors)
+            {
+                // If compilation/loading initiated via CreateScriptInstance(),
+                // it does not want the errors, so just get out
+                if (!m_scriptErrors.ContainsKey(itemId))
+                {
+                    return;
+                }
+
+                // Initiated via CreateScriptInstanceEr(), if we know what the
+                // errors are, save them and wake CreateScriptInstanceEr().
+                if (errors != null)
+                {
+                    m_scriptErrors[itemId] = errors;
+                    System.Threading.Monitor.PulseAll(m_scriptErrors);
+                    return;
+                }
+            }
+
+            // Initiated via CreateScriptInstanceEr() but we don't know what
+            // the errors are yet, so retrieve them from the script engine.
+            // This may involve some waiting internal to GetScriptErrors().
+            errors = GetScriptErrors(itemId);
+
+            // Get a default non-null value to indicate success.
+            if (errors == null)
+            {
+                errors = new ArrayList();
+            }
+
+            // Post to CreateScriptInstanceEr() and wake it up
+            lock (m_scriptErrors)
+            {
+                m_scriptErrors[itemId] = errors;
+                System.Threading.Monitor.PulseAll(m_scriptErrors);
+            }
+        }
+
+        // Like StoreScriptErrors(), but just posts a single string message
+        private void StoreScriptError(UUID itemId, string message)
+        {
+            ArrayList errors = new ArrayList(1);
+            errors.Add(message);
+            StoreScriptErrors(itemId, errors);
         }
 
         /// <summary>
@@ -406,15 +597,7 @@ namespace OpenSim.Region.Framework.Scenes
         /// </param>
         public void RemoveScriptInstance(UUID itemId, bool sceneObjectBeingDeleted)
         {
-            bool scriptPresent = false;
-
-            lock (m_items)
-            {
-                if (m_items.ContainsKey(itemId))
-                    scriptPresent = true;
-            }
-            
-            if (scriptPresent)
+            if (m_items.ContainsKey(itemId))
             {
                 if (!sceneObjectBeingDeleted)
                     m_part.RemoveScriptEvents(itemId);
@@ -439,14 +622,16 @@ namespace OpenSim.Region.Framework.Scenes
         /// <returns></returns>
         private bool InventoryContainsName(string name)
         {
-            lock (m_items)
+            m_items.LockItemsForRead(true);
+            foreach (TaskInventoryItem item in m_items.Values)
             {
-                foreach (TaskInventoryItem item in m_items.Values)
+                if (item.Name == name)
                 {
-                    if (item.Name == name)
-                        return true;
+                    m_items.LockItemsForRead(false);
+                    return true;
                 }
             }
+            m_items.LockItemsForRead(false);
             return false;
         }
 
@@ -488,8 +673,9 @@ namespace OpenSim.Region.Framework.Scenes
         /// <param name="item"></param>
         public void AddInventoryItemExclusive(TaskInventoryItem item, bool allowedDrop)
         {
-            List<TaskInventoryItem> il = GetInventoryItems();
-            
+            m_items.LockItemsForRead(true);
+            List<TaskInventoryItem> il = new List<TaskInventoryItem>(m_items.Values);
+            m_items.LockItemsForRead(false);
             foreach (TaskInventoryItem i in il)
             {
                 if (i.Name == item.Name)
@@ -527,14 +713,14 @@ namespace OpenSim.Region.Framework.Scenes
             item.Name = name;
             item.GroupID = m_part.GroupID;
 
-            lock (m_items)
-                m_items.Add(item.ItemID, item);
-
-            if (allowedDrop) 
-                m_part.TriggerScriptChangedEvent(Changed.ALLOWED_DROP);
-            else
-                m_part.TriggerScriptChangedEvent(Changed.INVENTORY);
-
+            m_items.LockItemsForWrite(true);
+            m_items.Add(item.ItemID, item);
+            m_items.LockItemsForWrite(false);
+                if (allowedDrop) 
+                    m_part.TriggerScriptChangedEvent(Changed.ALLOWED_DROP);
+                else
+                    m_part.TriggerScriptChangedEvent(Changed.INVENTORY);
+            
             m_inventorySerial++;
             //m_inventorySerial += 2;
             HasInventoryChanged = true;
@@ -550,15 +736,15 @@ namespace OpenSim.Region.Framework.Scenes
         /// <param name="items"></param>
         public void RestoreInventoryItems(ICollection<TaskInventoryItem> items)
         {
-            lock (m_items)
+            m_items.LockItemsForWrite(true);
+            foreach (TaskInventoryItem item in items)
             {
-                foreach (TaskInventoryItem item in items)
-                {
-                    m_items.Add(item.ItemID, item);
-//                    m_part.TriggerScriptChangedEvent(Changed.INVENTORY);
-                }
-                m_inventorySerial++;
+                m_items.Add(item.ItemID, item);
+//                m_part.TriggerScriptChangedEvent(Changed.INVENTORY);
             }
+            m_items.LockItemsForWrite(false);
+
+            m_inventorySerial++;
         }
 
         /// <summary>
@@ -569,10 +755,9 @@ namespace OpenSim.Region.Framework.Scenes
         public TaskInventoryItem GetInventoryItem(UUID itemId)
         {
             TaskInventoryItem item;
-
-            lock (m_items)
-                m_items.TryGetValue(itemId, out item);
-
+            m_items.LockItemsForRead(true);
+            m_items.TryGetValue(itemId, out item);
+            m_items.LockItemsForRead(false);
             return item;
         }
 
@@ -588,15 +773,16 @@ namespace OpenSim.Region.Framework.Scenes
         {
             IList<TaskInventoryItem> items = new List<TaskInventoryItem>();
 
-            lock (m_items)
+            m_items.LockItemsForRead(true);
+
+            foreach (TaskInventoryItem item in m_items.Values)
             {
-                foreach (TaskInventoryItem item in m_items.Values)
-                {
-                    if (item.Name == name)
-                        items.Add(item);
-                }
+                if (item.Name == name)
+                    items.Add(item);
             }
 
+            m_items.LockItemsForRead(false);
+
             return items;
         }
         
@@ -689,9 +875,9 @@ namespace OpenSim.Region.Framework.Scenes
 
         public bool UpdateInventoryItem(TaskInventoryItem item, bool fireScriptEvents, bool considerChanged)
         {
-            TaskInventoryItem it = GetInventoryItem(item.ItemID);
-            if (it != null)
+            m_items.LockItemsForWrite(true);
 
+            if (m_items.ContainsKey(item.ItemID))
             {
                 item.ParentID = m_part.UUID;
                 item.ParentPartID = m_part.UUID;
@@ -702,14 +888,10 @@ namespace OpenSim.Region.Framework.Scenes
                     item.GroupID = m_part.GroupID;
 
                 if (item.AssetID == UUID.Zero)
-                    item.AssetID = it.AssetID;
-
-                lock (m_items)
-                {
-                    m_items[item.ItemID] = item;
-                    m_inventorySerial++;
-                }
+                    item.AssetID = m_items[item.ItemID].AssetID;
 
+                m_items[item.ItemID] = item;
+                m_inventorySerial++;
                 if (fireScriptEvents)
                     m_part.TriggerScriptChangedEvent(Changed.INVENTORY);
                 if (considerChanged)
@@ -717,6 +899,7 @@ namespace OpenSim.Region.Framework.Scenes
                     HasInventoryChanged = true;
                     m_part.ParentGroup.HasGroupChanged = true;
                 }
+                m_items.LockItemsForWrite(false);
                 return true;
             }
             else
@@ -727,8 +910,9 @@ namespace OpenSim.Region.Framework.Scenes
                     item.ItemID, m_part.Name, m_part.UUID, 
                     m_part.AbsolutePosition, m_part.ParentGroup.Scene.RegionInfo.RegionName);
             }
-            return false;
+            m_items.LockItemsForWrite(false);
 
+            return false;
         }
 
         /// <summary>
@@ -739,107 +923,68 @@ namespace OpenSim.Region.Framework.Scenes
         /// in this prim's inventory.</returns>
         public int RemoveInventoryItem(UUID itemID)
         {
-            TaskInventoryItem item = GetInventoryItem(itemID);
-            if (item != null)
+            m_items.LockItemsForRead(true);
+
+            if (m_items.ContainsKey(itemID))
             {
                 int type = m_items[itemID].InvType;
+                m_items.LockItemsForRead(false);
                 if (type == 10) // Script
                 {
-                    m_part.RemoveScriptEvents(itemID);
                     m_part.ParentGroup.Scene.EventManager.TriggerRemoveScript(m_part.LocalId, itemID);
                 }
+                m_items.LockItemsForWrite(true);
                 m_items.Remove(itemID);
+                m_items.LockItemsForWrite(false);
                 m_inventorySerial++;
                 m_part.TriggerScriptChangedEvent(Changed.INVENTORY);
 
                 HasInventoryChanged = true;
                 m_part.ParentGroup.HasGroupChanged = true;
 
-                if (!ContainsScripts())
+                int scriptcount = 0;
+                m_items.LockItemsForRead(true);
+                foreach (TaskInventoryItem item in m_items.Values)
+                {
+                    if (item.Type == 10)
+                    {
+                        scriptcount++;
+                    }
+                }
+                m_items.LockItemsForRead(false);
+                
+
+                if (scriptcount <= 0)
+                {
                     m_part.RemFlag(PrimFlags.Scripted);
+                }
 
                 m_part.ScheduleFullUpdate();
 
                 return type;
-                
             }
             else
             {
+                m_items.LockItemsForRead(false);
                 m_log.ErrorFormat(
                     "[PRIM INVENTORY]: " +
-                    "Tried to remove item ID {0} from prim {1}, {2} at {3} in {4} but the item does not exist in this inventory",
-                    itemID, m_part.Name, m_part.UUID,
-                    m_part.AbsolutePosition, m_part.ParentGroup.Scene.RegionInfo.RegionName);
+                    "Tried to remove item ID {0} from prim {1}, {2} but the item does not exist in this inventory",
+                    itemID, m_part.Name, m_part.UUID);
             }
 
             return -1;
         }
 
-        private bool CreateInventoryFile()
+        private bool CreateInventoryFileName()
         {
             if (m_inventoryFileName == String.Empty ||
                 m_inventoryFileNameSerial < m_inventorySerial)
             {
-                // Something changed, we need to create a new file
                 m_inventoryFileName = "inventory_" + UUID.Random().ToString() + ".tmp";
                 m_inventoryFileNameSerial = m_inventorySerial;
-
-                InventoryStringBuilder invString = new InventoryStringBuilder(m_part.UUID, UUID.Zero);
-
-                lock (m_items)
-                {
-                    foreach (TaskInventoryItem item in m_items.Values)
-                    {
-                        UUID ownerID = item.OwnerID;
-                        uint everyoneMask = 0;
-                        uint baseMask = item.BasePermissions;
-                        uint ownerMask = item.CurrentPermissions;
-                        uint groupMask = item.GroupPermissions;
-
-                        invString.AddItemStart();
-                        invString.AddNameValueLine("item_id", item.ItemID.ToString());
-                        invString.AddNameValueLine("parent_id", m_part.UUID.ToString());
-
-                        invString.AddPermissionsStart();
-
-                        invString.AddNameValueLine("base_mask", Utils.UIntToHexString(baseMask));
-                        invString.AddNameValueLine("owner_mask", Utils.UIntToHexString(ownerMask));
-                        invString.AddNameValueLine("group_mask", Utils.UIntToHexString(groupMask));
-                        invString.AddNameValueLine("everyone_mask", Utils.UIntToHexString(everyoneMask));
-                        invString.AddNameValueLine("next_owner_mask", Utils.UIntToHexString(item.NextPermissions));
-
-                        invString.AddNameValueLine("creator_id", item.CreatorID.ToString());
-                        invString.AddNameValueLine("owner_id", ownerID.ToString());
-
-                        invString.AddNameValueLine("last_owner_id", item.LastOwnerID.ToString());
-
-                        invString.AddNameValueLine("group_id", item.GroupID.ToString());
-                        invString.AddSectionEnd();
-
-                        invString.AddNameValueLine("asset_id", item.AssetID.ToString());
-                        invString.AddNameValueLine("type", TaskInventoryItem.Types[item.Type]);
-                        invString.AddNameValueLine("inv_type", TaskInventoryItem.InvTypes[item.InvType]);
-                        invString.AddNameValueLine("flags", Utils.UIntToHexString(item.Flags));
-
-                        invString.AddSaleStart();
-                        invString.AddNameValueLine("sale_type", "not");
-                        invString.AddNameValueLine("sale_price", "0");
-                        invString.AddSectionEnd();
-
-                        invString.AddNameValueLine("name", item.Name + "|");
-                        invString.AddNameValueLine("desc", item.Description + "|");
-
-                        invString.AddNameValueLine("creation_date", item.CreationDate.ToString());
-                        invString.AddSectionEnd();
-                    }
-                }
-
-                m_inventoryFileData = Utils.StringToBytes(invString.BuildString);
-
                 return true;
             }
 
-            // No need to recreate, the existing file is fine
             return false;
         }
 
@@ -849,26 +994,99 @@ namespace OpenSim.Region.Framework.Scenes
         /// <param name="xferManager"></param>
         public void RequestInventoryFile(IClientAPI client, IXfer xferManager)
         {
-            bool changed = CreateInventoryFile();
+            bool changed = CreateInventoryFileName();
+
+            bool includeAssets = false;
+            if (m_part.ParentGroup.Scene.Permissions.CanEditObjectInventory(m_part.UUID, client.AgentId))
+                includeAssets = true;
+
+            if (m_inventoryPrivileged != includeAssets)
+                changed = true;
+
+            InventoryStringBuilder invString = new InventoryStringBuilder(m_part.UUID, UUID.Zero);
+
+            Items.LockItemsForRead(true);
 
             if (m_inventorySerial == 0) // No inventory
             {
                 client.SendTaskInventory(m_part.UUID, 0, new byte[0]);
+                Items.LockItemsForRead(false);
                 return;
             }
 
-            // In principle, we should only do the rest if the inventory changed;
-            // by sending m_inventorySerial to the client, it ought to know
-            // that nothing changed and that it doesn't need to request the file. 
-            // Unfortunately, it doesn't look like the client optimizes this; 
-            // the client seems to always come back and request the Xfer, 
-            // no matter what value m_inventorySerial has.
+            if (!changed)
+            {
+                if (m_inventoryFileData.Length > 2)
+                {
+                    xferManager.AddNewFile(m_inventoryFileName,
+                            m_inventoryFileData);
+                    client.SendTaskInventory(m_part.UUID, (short)m_inventorySerial,
+                            Util.StringToBytes256(m_inventoryFileName));
+
+                    Items.LockItemsForRead(false);
+                    return;
+                }
+            }
+
+            m_inventoryPrivileged = includeAssets;
+
+            foreach (TaskInventoryItem item in m_items.Values)
+            {
+                UUID ownerID = item.OwnerID;
+                uint everyoneMask = 0;
+                uint baseMask = item.BasePermissions;
+                uint ownerMask = item.CurrentPermissions;
+                uint groupMask = item.GroupPermissions;
+
+                invString.AddItemStart();
+                invString.AddNameValueLine("item_id", item.ItemID.ToString());
+                invString.AddNameValueLine("parent_id", m_part.UUID.ToString());
+
+                invString.AddPermissionsStart();
+
+                invString.AddNameValueLine("base_mask", Utils.UIntToHexString(baseMask));
+                invString.AddNameValueLine("owner_mask", Utils.UIntToHexString(ownerMask));
+                invString.AddNameValueLine("group_mask", Utils.UIntToHexString(groupMask));
+                invString.AddNameValueLine("everyone_mask", Utils.UIntToHexString(everyoneMask));
+                invString.AddNameValueLine("next_owner_mask", Utils.UIntToHexString(item.NextPermissions));
+
+                invString.AddNameValueLine("creator_id", item.CreatorID.ToString());
+                invString.AddNameValueLine("owner_id", ownerID.ToString());
+
+                invString.AddNameValueLine("last_owner_id", item.LastOwnerID.ToString());
+
+                invString.AddNameValueLine("group_id", item.GroupID.ToString());
+                invString.AddSectionEnd();
+
+                if (includeAssets)
+                    invString.AddNameValueLine("asset_id", item.AssetID.ToString());
+                else
+                    invString.AddNameValueLine("asset_id", UUID.Zero.ToString());
+                invString.AddNameValueLine("type", TaskInventoryItem.Types[item.Type]);
+                invString.AddNameValueLine("inv_type", TaskInventoryItem.InvTypes[item.InvType]);
+                invString.AddNameValueLine("flags", Utils.UIntToHexString(item.Flags));
+
+                invString.AddSaleStart();
+                invString.AddNameValueLine("sale_type", "not");
+                invString.AddNameValueLine("sale_price", "0");
+                invString.AddSectionEnd();
+
+                invString.AddNameValueLine("name", item.Name + "|");
+                invString.AddNameValueLine("desc", item.Description + "|");
+
+                invString.AddNameValueLine("creation_date", item.CreationDate.ToString());
+                invString.AddSectionEnd();
+            }
+
+            Items.LockItemsForRead(false);
+
+            m_inventoryFileData = Utils.StringToBytes(invString.BuildString);
 
             if (m_inventoryFileData.Length > 2)
-                // Add the file for Xfer
+            {
                 xferManager.AddNewFile(m_inventoryFileName, m_inventoryFileData);
+            }
 
-            // Tell the client we're ready to Xfer the file
             client.SendTaskInventory(m_part.UUID, (short)m_inventorySerial,
                     Util.StringToBytes256(m_inventoryFileName));
         }
@@ -881,10 +1099,11 @@ namespace OpenSim.Region.Framework.Scenes
         {
             if (HasInventoryChanged)
             {
-                HasInventoryChanged = false;
-                List<TaskInventoryItem> items = GetInventoryItems();
-                datastore.StorePrimInventory(m_part.UUID, items);
+                Items.LockItemsForRead(true);
+                datastore.StorePrimInventory(m_part.UUID, Items.Values);
+                Items.LockItemsForRead(false);
 
+                HasInventoryChanged = false;
             }
         }
 
@@ -951,80 +1170,61 @@ namespace OpenSim.Region.Framework.Scenes
         {
             uint mask=0x7fffffff;
 
-            lock (m_items)
+            foreach (TaskInventoryItem item in m_items.Values)
             {
-                foreach (TaskInventoryItem item in m_items.Values)
+                if ((item.CurrentPermissions & item.NextPermissions & (uint)PermissionMask.Copy) == 0)
+                    mask &= ~((uint)PermissionMask.Copy >> 13);
+                if ((item.CurrentPermissions & item.NextPermissions & (uint)PermissionMask.Transfer) == 0)
+                    mask &= ~((uint)PermissionMask.Transfer >> 13);
+                if ((item.CurrentPermissions & item.NextPermissions & (uint)PermissionMask.Modify) == 0)
+                    mask &= ~((uint)PermissionMask.Modify >> 13);
+
+                if (item.InvType == (int)InventoryType.Object)
                 {
-                    if ((item.CurrentPermissions & item.NextPermissions & (uint)PermissionMask.Copy) == 0)
+                    if ((item.CurrentPermissions & ((uint)PermissionMask.Copy >> 13)) == 0)
                         mask &= ~((uint)PermissionMask.Copy >> 13);
-                    if ((item.CurrentPermissions & item.NextPermissions & (uint)PermissionMask.Transfer) == 0)
+                    if ((item.CurrentPermissions & ((uint)PermissionMask.Transfer >> 13)) == 0)
                         mask &= ~((uint)PermissionMask.Transfer >> 13);
-                    if ((item.CurrentPermissions & item.NextPermissions & (uint)PermissionMask.Modify) == 0)
+                    if ((item.CurrentPermissions & ((uint)PermissionMask.Modify >> 13)) == 0)
                         mask &= ~((uint)PermissionMask.Modify >> 13);
-
-                    if (item.InvType != (int)InventoryType.Object)
-                    {
-                        if ((item.CurrentPermissions & item.NextPermissions & (uint)PermissionMask.Copy) == 0)
-                            mask &= ~((uint)PermissionMask.Copy >> 13);
-                        if ((item.CurrentPermissions & item.NextPermissions & (uint)PermissionMask.Transfer) == 0)
-                            mask &= ~((uint)PermissionMask.Transfer >> 13);
-                        if ((item.CurrentPermissions & item.NextPermissions & (uint)PermissionMask.Modify) == 0)
-                            mask &= ~((uint)PermissionMask.Modify >> 13);
-                    }
-                    else
-                    {
-                        if ((item.CurrentPermissions & ((uint)PermissionMask.Copy >> 13)) == 0)
-                            mask &= ~((uint)PermissionMask.Copy >> 13);
-                        if ((item.CurrentPermissions & ((uint)PermissionMask.Transfer >> 13)) == 0)
-                            mask &= ~((uint)PermissionMask.Transfer >> 13);
-                        if ((item.CurrentPermissions & ((uint)PermissionMask.Modify >> 13)) == 0)
-                            mask &= ~((uint)PermissionMask.Modify >> 13);
-                    }
-    
-                    if ((item.CurrentPermissions & (uint)PermissionMask.Copy) == 0)
-                        mask &= ~(uint)PermissionMask.Copy;
-                    if ((item.CurrentPermissions & (uint)PermissionMask.Transfer) == 0)
-                        mask &= ~(uint)PermissionMask.Transfer;
-                    if ((item.CurrentPermissions & (uint)PermissionMask.Modify) == 0)
-                        mask &= ~(uint)PermissionMask.Modify;
                 }
+
+                if ((item.CurrentPermissions & (uint)PermissionMask.Copy) == 0)
+                    mask &= ~(uint)PermissionMask.Copy;
+                if ((item.CurrentPermissions & (uint)PermissionMask.Transfer) == 0)
+                    mask &= ~(uint)PermissionMask.Transfer;
+                if ((item.CurrentPermissions & (uint)PermissionMask.Modify) == 0)
+                    mask &= ~(uint)PermissionMask.Modify;
             }
-                
             return mask;
         }
 
         public void ApplyNextOwnerPermissions()
         {
-            lock (m_items)
+            foreach (TaskInventoryItem item in m_items.Values)
             {
-                foreach (TaskInventoryItem item in m_items.Values)
+                if (item.InvType == (int)InventoryType.Object && (item.CurrentPermissions & 7) != 0)
                 {
-                    if (item.InvType == (int)InventoryType.Object && (item.CurrentPermissions & 7) != 0)
-                    {
-                        if ((item.CurrentPermissions & ((uint)PermissionMask.Copy >> 13)) == 0)
-                            item.CurrentPermissions &= ~(uint)PermissionMask.Copy;
-                        if ((item.CurrentPermissions & ((uint)PermissionMask.Transfer >> 13)) == 0)
-                            item.CurrentPermissions &= ~(uint)PermissionMask.Transfer;
-                        if ((item.CurrentPermissions & ((uint)PermissionMask.Modify >> 13)) == 0)
-                            item.CurrentPermissions &= ~(uint)PermissionMask.Modify;
-                    }
-                    item.CurrentPermissions &= item.NextPermissions;
-                    item.BasePermissions &= item.NextPermissions;
-                    item.EveryonePermissions &= item.NextPermissions;
-                    item.OwnerChanged = true;
+                    if ((item.CurrentPermissions & ((uint)PermissionMask.Copy >> 13)) == 0)
+                        item.CurrentPermissions &= ~(uint)PermissionMask.Copy;
+                    if ((item.CurrentPermissions & ((uint)PermissionMask.Transfer >> 13)) == 0)
+                        item.CurrentPermissions &= ~(uint)PermissionMask.Transfer;
+                    if ((item.CurrentPermissions & ((uint)PermissionMask.Modify >> 13)) == 0)
+                        item.CurrentPermissions &= ~(uint)PermissionMask.Modify;
                 }
+                item.OwnerChanged = true;
+                item.CurrentPermissions &= item.NextPermissions;
+                item.BasePermissions &= item.NextPermissions;
+                item.EveryonePermissions &= item.NextPermissions;
             }
         }
 
         public void ApplyGodPermissions(uint perms)
         {
-            lock (m_items)
+            foreach (TaskInventoryItem item in m_items.Values)
             {
-                foreach (TaskInventoryItem item in m_items.Values)
-                {
-                    item.CurrentPermissions = perms;
-                    item.BasePermissions = perms;
-                }
+                item.CurrentPermissions = perms;
+                item.BasePermissions = perms;
             }
             m_inventorySerial++;
             HasInventoryChanged = true;
@@ -1032,17 +1232,13 @@ namespace OpenSim.Region.Framework.Scenes
 
         public bool ContainsScripts()
         {
-            lock (m_items)
+            foreach (TaskInventoryItem item in m_items.Values)
             {
-                foreach (TaskInventoryItem item in m_items.Values)
+                if (item.InvType == (int)InventoryType.LSL)
                 {
-                    if (item.InvType == (int)InventoryType.LSL)
-                    {
-                        return true;
-                    }
+                    return true;
                 }
             }
-            
             return false;
         }
 
@@ -1050,11 +1246,8 @@ namespace OpenSim.Region.Framework.Scenes
         {
             List<UUID> ret = new List<UUID>();
 
-            lock (m_items)
-            {
-                foreach (TaskInventoryItem item in m_items.Values)
-                    ret.Add(item.ItemID);
-            }
+            foreach (TaskInventoryItem item in m_items.Values)
+                ret.Add(item.ItemID);
 
             return ret;
         }
@@ -1085,31 +1278,46 @@ namespace OpenSim.Region.Framework.Scenes
         
         public Dictionary<UUID, string> GetScriptStates()
         {
+            return GetScriptStates(false);
+        }
+
+        public Dictionary<UUID, string> GetScriptStates(bool oldIDs)
+        {
             IScriptModule[] engines = m_part.ParentGroup.Scene.RequestModuleInterfaces<IScriptModule>();
 
             Dictionary<UUID, string> ret = new Dictionary<UUID, string>();
             if (engines == null) // No engine at all
                 return ret;
 
-            List<TaskInventoryItem> scripts = GetInventoryScripts();
-
-            foreach (TaskInventoryItem item in scripts)
+            Items.LockItemsForRead(true);
+            foreach (TaskInventoryItem item in m_items.Values)
             {
-                foreach (IScriptModule e in engines)
+                if (item.InvType == (int)InventoryType.LSL)
                 {
-                    if (e != null)
+                    foreach (IScriptModule e in engines)
                     {
-                        string n = e.GetXMLState(item.ItemID);
-                        if (n != String.Empty)
+                        if (e != null)
                         {
-                            if (!ret.ContainsKey(item.ItemID))
-                                ret[item.ItemID] = n;
-                            break;
+                            string n = e.GetXMLState(item.ItemID);
+                            if (n != String.Empty)
+                            {
+                                if (oldIDs)
+                                {
+                                    if (!ret.ContainsKey(item.OldItemID))
+                                        ret[item.OldItemID] = n;
+                                }
+                                else
+                                {
+                                    if (!ret.ContainsKey(item.ItemID))
+                                        ret[item.ItemID] = n;
+                                }
+                                break;
+                            }
                         }
                     }
                 }
             }
-            
+            Items.LockItemsForRead(false);
             return ret;
         }
         
@@ -1119,21 +1327,27 @@ namespace OpenSim.Region.Framework.Scenes
             if (engines == null)
                 return;
 
-            List<TaskInventoryItem> scripts = GetInventoryScripts();
 
-            foreach (TaskInventoryItem item in scripts)
+            Items.LockItemsForRead(true);
+
+            foreach (TaskInventoryItem item in m_items.Values)
             {
-                foreach (IScriptModule engine in engines)
+                if (item.InvType == (int)InventoryType.LSL)
                 {
-                    if (engine != null)
+                    foreach (IScriptModule engine in engines)
                     {
-                        if (item.OwnerChanged)
-                            engine.PostScriptEvent(item.ItemID, "changed", new Object[] { (int)Changed.OWNER });
-                        item.OwnerChanged = false;
-                        engine.ResumeScript(item.ItemID);
+                        if (engine != null)
+                        {
+                            if (item.OwnerChanged)
+                                engine.PostScriptEvent(item.ItemID, "changed", new Object[] { (int)Changed.OWNER });
+                            item.OwnerChanged = false;
+                            engine.ResumeScript(item.ItemID);
+                        }
                     }
                 }
             }
+
+            Items.LockItemsForRead(false);
         }
     }
 }