From 5607fd3af828846291de3358067bb1214619489e Mon Sep 17 00:00:00 2001
From: Justin Clark-Casey (justincc)
Date: Wed, 19 Oct 2011 21:30:37 +0100
Subject: Fix resume scripts.

On resume, we need to place requeue the script for event processing if there are any events on the queue.
Also need to do this under m_Script lock in order to avoid a race
---
 .../ScriptEngine/Shared/Instance/ScriptInstance.cs | 40 +++++++++++++++++-----
 OpenSim/Region/ScriptEngine/XEngine/XEngine.cs     |  2 +-
 2 files changed, 33 insertions(+), 9 deletions(-)

diff --git a/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs b/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
index 893f3ef..f9af9c1 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
@@ -55,7 +55,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
 {
     public class ScriptInstance : MarshalByRefObject, IScriptInstance
     {
-//        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
         
         private IScriptEngine m_Engine;
         private IScriptWorkItem m_CurrentResult = null;
@@ -138,7 +138,31 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
             set { m_RunEvents = value; }
         }
 
-        public bool Suspended { get; set; }
+        public bool Suspended
+        {
+            get { return m_Suspended; }
+
+            set
+            {
+                // Need to do this inside a lock in order to avoid races with EventProcessor()
+                lock (m_Script)
+                {
+                    bool wasSuspended = m_Suspended;
+                    m_Suspended = value;
+    
+                    if (wasSuspended && !m_Suspended)
+                    {
+                        lock (m_EventQueue)
+                        {
+                            // Need to place ourselves back in a work item if there are events to process
+                            if ((m_EventQueue.Count > 0) && m_RunEvents && (!m_ShuttingDown))
+                                m_CurrentResult = m_Engine.QueueEventHandler(this);
+                        }
+                    }
+                }
+            }
+        }
+        private bool m_Suspended;
 
         public bool ShuttingDown
         {
@@ -645,13 +669,13 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
         /// <returns></returns>
         public object EventProcessor()
         {
-//            m_log.DebugFormat("[XEngine]: EventProcessor() invoked for {0}.{1}", PrimName, ScriptName);
-
-            if (Suspended)
-                return 0;
-
             lock (m_Script)
             {
+//                m_log.DebugFormat("[XEngine]: EventProcessor() invoked for {0}.{1}", PrimName, ScriptName);
+
+                if (Suspended)
+                    return 0;
+
                 EventParams data = null;
 
                 lock (m_EventQueue)
@@ -689,7 +713,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
                 {
     //                m_log.DebugFormat("[Script] Script {0}.{1} state set to {2}",
     //                        m_PrimName, m_ScriptName, data.Params[0].ToString());
-                    m_State=data.Params[0].ToString();
+                    m_State = data.Params[0].ToString();
                     AsyncCommandManager.RemoveScript(m_Engine,
                         m_LocalID, m_ItemID);
 
diff --git a/OpenSim/Region/ScriptEngine/XEngine/XEngine.cs b/OpenSim/Region/ScriptEngine/XEngine/XEngine.cs
index bb08d90..5ee8dbf 100644
--- a/OpenSim/Region/ScriptEngine/XEngine/XEngine.cs
+++ b/OpenSim/Region/ScriptEngine/XEngine/XEngine.cs
@@ -946,7 +946,7 @@ namespace OpenSim.Region.ScriptEngine.XEngine
                 if (!m_Scripts.ContainsKey(itemID))
                     return;
 
-                instance=m_Scripts[itemID];
+                instance = m_Scripts[itemID];
                 m_Scripts.Remove(itemID);
             }
 
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