Rewrote parts of the code that were double-locking different objects. This is about half of the code base reviewed.

3 files changed, 37 insertions, 31 deletions

diff --git a/OpenSim/Region/CoreModules/Avatar/Friends/FriendsModule.cs b/OpenSim/Region/CoreModules/Avatar/Friends/FriendsModule.cs
index fc7d63a..4abad81 100644
--- a/OpenSim/Region/CoreModules/Avatar/Friends/FriendsModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Friends/FriendsModule.cs
@@ -442,42 +442,46 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
 
         private ScenePresence GetRootPresenceFromAgentID(UUID AgentID)
         {
-            ScenePresence returnAgent = null;
+            List<Scene> scenes = null;
             lock (m_scenes)
+                scenes = new List<Scene>(m_scenes.Values);
+
+            ScenePresence returnAgent = null;
+            ScenePresence queryagent = null;
+            foreach (Scene scene in scenes)
             {
-                ScenePresence queryagent = null;
-                foreach (Scene scene in m_scenes.Values)
+                queryagent = scene.GetScenePresence(AgentID);
+                if (queryagent != null)
                 {
-                    queryagent = scene.GetScenePresence(AgentID);
-                    if (queryagent != null)
+                    if (!queryagent.IsChildAgent)
                     {
-                        if (!queryagent.IsChildAgent)
-                        {
-                            returnAgent = queryagent;
-                            break;
-                        }
+                        returnAgent = queryagent;
+                        break;
                     }
                 }
             }
+
             return returnAgent;
         }
 
         private ScenePresence GetAnyPresenceFromAgentID(UUID AgentID)
         {
-            ScenePresence returnAgent = null;
+            List<Scene> scenes = null;
             lock (m_scenes)
+                scenes = new List<Scene>(m_scenes.Values);
+
+            ScenePresence returnAgent = null;
+            ScenePresence queryagent = null;
+            foreach (Scene scene in m_scenes.Values)
             {
-                ScenePresence queryagent = null;
-                foreach (Scene scene in m_scenes.Values)
+                queryagent = scene.GetScenePresence(AgentID);
+                if (queryagent != null)
                 {
-                    queryagent = scene.GetScenePresence(AgentID);
-                    if (queryagent != null)
-                    {
-                        returnAgent = queryagent;
-                        break;
-                    }
+                    returnAgent = queryagent;
+                    break;
                 }
             }
+ 
             return returnAgent;
         }
         
diff --git a/OpenSim/Region/CoreModules/Avatar/InstantMessage/PresenceModule.cs b/OpenSim/Region/CoreModules/Avatar/InstantMessage/PresenceModule.cs
index ad05bab..42dd7ff 100644
--- a/OpenSim/Region/CoreModules/Avatar/InstantMessage/PresenceModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/InstantMessage/PresenceModule.cs
@@ -290,13 +290,14 @@ namespace OpenSim.Region.CoreModules.Avatar.InstantMessage
 
             // get the agent. This should work every time, as we just got a packet from it
             ScenePresence agent = null;
+            List<Scene> scenes = null;
             lock (m_Scenes)
+                scenes = new List<Scene>(m_Scenes);
+
+            foreach (Scene scene in scenes)
             {
-                foreach (Scene scene in m_Scenes)
-                {
-                    agent = scene.GetScenePresence(agentID);
-                    if (agent != null) break;
-                }
+                agent = scene.GetScenePresence(agentID);
+                if (agent != null) break;
             }
 
             // just to be paranoid...
diff --git a/OpenSim/Region/CoreModules/Avatar/Inventory/Transfer/InventoryTransferModule.cs b/OpenSim/Region/CoreModules/Avatar/Inventory/Transfer/InventoryTransferModule.cs
index d9a021f..e6e0483 100644
--- a/OpenSim/Region/CoreModules/Avatar/Inventory/Transfer/InventoryTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Inventory/Transfer/InventoryTransferModule.cs
@@ -111,16 +111,17 @@ namespace OpenSim.Region.CoreModules.Avatar.Inventory.Transfer
 
         private Scene FindClientScene(UUID agentId)
         {
+            List<Scene> scenes = null;
             lock (m_Scenelist)
+                scenes = new List<Scene>(m_Scenelist);
+
+            foreach (Scene scene in scenes)
             {
-                foreach (Scene scene in m_Scenelist)
+                ScenePresence presence = scene.GetScenePresence(agentId);
+                if (presence != null)
                 {
-                    ScenePresence presence = scene.GetScenePresence(agentId);
-                    if (presence != null)
-                    {
-                        if (!presence.IsChildAgent)
-                            return scene;
-                    }
+                    if (!presence.IsChildAgent)
+                        return scene;
                 }
             }
             return null;