From 32444d98cb13423fdf8c874e4fbb7ea17670d7c5 Mon Sep 17 00:00:00 2001
From: Justin Clark-Casey (justincc)
Date: Wed, 31 Aug 2011 16:29:51 +0100
Subject: Make SP.Attachments available as sp.GetAttachments() instead.

The approach here, as in other parts of OpenSim, is to return a copy of the list rather than the attachments list itself
This prevents callers from forgetting to lock the list when they read it, as was happening in various parts of the codebase.
It also improves liveness.
This might improve attachment anomolies when performing region crossings.
---
 .../EntityTransfer/EntityTransferModule.cs         | 61 ++++++++++++----------
 1 file changed, 32 insertions(+), 29 deletions(-)

(limited to 'OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs')

diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index 7963e53..c24cc17 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -208,7 +208,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                     sp.ControllingClient.SendLocalTeleport(position, lookAt, teleportFlags);
                     sp.Teleport(position);
 
-                    foreach (SceneObjectGroup grp in sp.Attachments)
+                    foreach (SceneObjectGroup grp in sp.GetAttachments())
                         sp.Scene.EventManager.TriggerOnScriptChangedEvent(grp.LocalId, (uint)Changed.TELEPORT);
                 }
                 else // Another region possibly in another simulator
@@ -559,11 +559,11 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
         protected virtual void AgentHasMovedAway(ScenePresence sp, bool logout)
         {
-            foreach (SceneObjectGroup sop in sp.Attachments)
+            foreach (SceneObjectGroup sop in sp.GetAttachments())
             {
                 sop.Scene.DeleteSceneObject(sop, true);
             }
-            sp.Attachments.Clear();
+            sp.ClearAttachments();
         }
 
         protected void KillEntity(Scene scene, uint localID)
@@ -1764,34 +1764,33 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
         protected bool CrossAttachmentsIntoNewRegion(GridRegion destination, ScenePresence sp, bool silent)
         {
-            List<SceneObjectGroup> m_attachments = sp.Attachments;
-            lock (m_attachments)
+            List<SceneObjectGroup> m_attachments = sp.GetAttachments();
+
+            // Validate
+            foreach (SceneObjectGroup gobj in m_attachments)
             {
-                // Validate
-                foreach (SceneObjectGroup gobj in m_attachments)
-                {
-                    if (gobj == null || gobj.IsDeleted)
-                        return false;
-                }
+                if (gobj == null || gobj.IsDeleted)
+                    return false;
+            }
 
-                foreach (SceneObjectGroup gobj in m_attachments)
+            foreach (SceneObjectGroup gobj in m_attachments)
+            {
+                // If the prim group is null then something must have happened to it!
+                if (gobj != null && gobj.RootPart != null)
                 {
-                    // If the prim group is null then something must have happened to it!
-                    if (gobj != null && gobj.RootPart != null)
-                    {
-                        // Set the parent localID to 0 so it transfers over properly.
-                        gobj.RootPart.SetParentLocalId(0);
-                        gobj.AbsolutePosition = gobj.RootPart.AttachedPos;
-                        gobj.IsAttachment = false;
-                        //gobj.RootPart.LastOwnerID = gobj.GetFromAssetID();
-                        m_log.DebugFormat("[ENTITY TRANSFER MODULE]: Sending attachment {0} to region {1}", gobj.UUID, destination.RegionName);
-                        CrossPrimGroupIntoNewRegion(destination, gobj, silent);
-                    }
+                    // Set the parent localID to 0 so it transfers over properly.
+                    gobj.RootPart.SetParentLocalId(0);
+                    gobj.AbsolutePosition = gobj.RootPart.AttachedPos;
+                    gobj.IsAttachment = false;
+                    //gobj.RootPart.LastOwnerID = gobj.GetFromAssetID();
+                    m_log.DebugFormat("[ENTITY TRANSFER MODULE]: Sending attachment {0} to region {1}", gobj.UUID, destination.RegionName);
+                    CrossPrimGroupIntoNewRegion(destination, gobj, silent);
                 }
-                m_attachments.Clear();
-
-                return true;
             }
+
+            sp.ClearAttachments();
+
+            return true;
         }
 
         #endregion
@@ -1840,7 +1839,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             int i = 0;
             if (sp.InTransitScriptStates.Count > 0)
             {
-                sp.Attachments.ForEach(delegate(SceneObjectGroup sog)
+                List<SceneObjectGroup> attachments = sp.GetAttachments();
+
+                foreach (SceneObjectGroup sog in attachments)
                 {
                     if (i < sp.InTransitScriptStates.Count)
                     {
@@ -1849,8 +1850,10 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                         sog.ResumeScripts();
                     }
                     else
-                        m_log.ErrorFormat("[ENTITY TRANSFER MODULE]: InTransitScriptStates.Count={0} smaller than Attachments.Count={1}", sp.InTransitScriptStates.Count, sp.Attachments.Count);
-                });
+                        m_log.ErrorFormat(
+                            "[ENTITY TRANSFER MODULE]: InTransitScriptStates.Count={0} smaller than Attachments.Count={1}",
+                            sp.InTransitScriptStates.Count, attachments.Count);
+                }
 
                 sp.InTransitScriptStates.Clear();
             }
-- 
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