From be3e676d33dc44c67bd427022badd73395ca5174 Mon Sep 17 00:00:00 2001
From: diva <diva@metaverseink.com>
Date: Wed, 4 Feb 2009 16:31:48 +0000
Subject: [PATCH] Addresses a race condition that happened between the viewer
 and the departing region wrt the creation of the child agent in the receiving
 region, and that resulted in failed TPs.

---
 OpenSim/Region/Environment/Scenes/Scene.cs         | 14 +++++++++++++-
 OpenSim/Region/Environment/Scenes/ScenePresence.cs |  3 +--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/OpenSim/Region/Environment/Scenes/Scene.cs b/OpenSim/Region/Environment/Scenes/Scene.cs
index 194d782f92..8d3792c347 100644
--- a/OpenSim/Region/Environment/Scenes/Scene.cs
+++ b/OpenSim/Region/Environment/Scenes/Scene.cs
@@ -2911,7 +2911,9 @@ namespace OpenSim.Region.Environment.Scenes
 //            m_log.DebugFormat(
 //                "[SCENE]: Incoming child agent update for {0} in {1}", cAgentData.AgentID, RegionInfo.RegionName);
 
-            ScenePresence childAgentUpdate = GetScenePresence(cAgentData.AgentID);
+            // We have to wait until the viewer contacts this region after receiving EAC.
+            // That calls AddNewClient, which finally creates the ScenePresence
+            ScenePresence childAgentUpdate = WaitGetScenePresence(cAgentData.AgentID);
             if (childAgentUpdate != null)
             {
                 childAgentUpdate.ChildAgentDataUpdate(cAgentData);
@@ -2947,6 +2949,16 @@ namespace OpenSim.Region.Environment.Scenes
             return false;
         }
 
+        protected virtual ScenePresence WaitGetScenePresence(UUID agentID)
+        {
+            int ntimes = 10;
+            ScenePresence childAgentUpdate = null;
+            while ((childAgentUpdate = GetScenePresence(agentID)) == null && (ntimes-- > 0))
+                Thread.Sleep(1000);
+            return childAgentUpdate;
+
+        }
+
         public virtual bool IncomingReleaseAgent(UUID id)
         {
             return m_sceneGridService.ReleaseAgent(id);
diff --git a/OpenSim/Region/Environment/Scenes/ScenePresence.cs b/OpenSim/Region/Environment/Scenes/ScenePresence.cs
index 7c0df39b3b..ed455f42eb 100644
--- a/OpenSim/Region/Environment/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Environment/Scenes/ScenePresence.cs
@@ -1000,7 +1000,6 @@ namespace OpenSim.Region.Environment.Scenes
         /// </summary>
         public void CompleteMovement()
         {
-            //Console.WriteLine("\n CompleteMovement \n");
             Vector3 look = Velocity;
             if ((look.X == 0) && (look.Y == 0) && (look.Z == 0))
             {
@@ -1017,7 +1016,7 @@ namespace OpenSim.Region.Environment.Scenes
 
                 if ((m_callbackURI != null) && !m_callbackURI.Equals(""))
                 {
-                    //m_log.DebugFormat("Found callback URI {0}", m_callbackURI);
+                    m_log.DebugFormat("[SCENE PRESENCE]: Releasing agent in URI {0}", m_callbackURI);
                     Scene.SendReleaseAgent(m_rootRegionHandle, UUID, m_callbackURI);
                     m_callbackURI = null;
                 }