From fe1d78bb78eeb71083c59c1c00e7767c7f865a89 Mon Sep 17 00:00:00 2001
From: Melanie Thielker
Date: Sun, 17 Aug 2008 19:17:44 +0000
Subject: Add some locking on m_undo in SceneObjectPart

---
 .../Region/Environment/Scenes/SceneObjectPart.cs   | 40 ++++++++++++++--------
 1 file changed, 25 insertions(+), 15 deletions(-)

(limited to 'OpenSim/Region')

diff --git a/OpenSim/Region/Environment/Scenes/SceneObjectPart.cs b/OpenSim/Region/Environment/Scenes/SceneObjectPart.cs
index 5038afc..d6aef95 100644
--- a/OpenSim/Region/Environment/Scenes/SceneObjectPart.cs
+++ b/OpenSim/Region/Environment/Scenes/SceneObjectPart.cs
@@ -1177,7 +1177,10 @@ namespace OpenSim.Region.Environment.Scenes
 
         public void ClearUndoState()
         {
-            m_undo.Clear();
+            lock(m_undo)
+            {
+                m_undo.Clear();
+            }
             StoreUndoState();
         }
 
@@ -2446,22 +2449,26 @@ namespace OpenSim.Region.Environment.Scenes
             {
                 if (m_parentGroup != null)
                 {
-                    if (m_undo.Count > 0)
+                    lock(m_undo)
                     {
-                        UndoState last = m_undo.Peek();
-                        if (last != null)
+                        if (m_undo.Count > 0)
                         {
-                            if (last.Compare(this))
-                                return;
+                            UndoState last = m_undo.Peek();
+                            if (last != null)
+                            {
+                                if (last.Compare(this))
+                                    return;
+                            }
                         }
-                    }
+                   
 
 
-                    if (m_parentGroup.GetSceneMaxUndo() > 0)
-                    {
-                        UndoState nUndo = new UndoState(this);
+                        if (m_parentGroup.GetSceneMaxUndo() > 0)
+                        {
+                            UndoState nUndo = new UndoState(this);
 
-                        m_undo.Push(nUndo);
+                            m_undo.Push(nUndo);
+                        }
 
                     }
                 }
@@ -2951,11 +2958,14 @@ namespace OpenSim.Region.Environment.Scenes
 
         public void Undo()
         {
-            if (m_undo.Count > 0)
+            lock(m_undo)
             {
-                UndoState goback = m_undo.Pop();
-                if (goback != null)
-                    goback.PlaybackState(this);
+                if (m_undo.Count > 0)
+                    {
+                        UndoState goback = m_undo.Pop();
+                        if (goback != null)
+                            goback.PlaybackState(this);
+                }
             }
         }
 
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