Add events to IScriptEngine to notify scripting modules of the removal

of objects from the scene, and of scripts from objects. This facilitates
the development of modules that can register prims with externall servers
for inbound email and XMLRPC. Currently implemented in XEngine only.
Also applying cmickeyb's compiler locking patch, since it seems risk-free.

OpenSim/Region/ScriptEngine/DotNetEngine/ScriptEngine.cs

@@ -96,6 +96,9 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
             get { return "ScriptEngine.DotNetEngine"; }
         }
         
+        public event ScriptRemoved OnScriptRemoved;
+        public event ObjectRemoved OnObjectRemoved;
+
         public ScriptEngine()
         {
             // For logging, just need any instance, doesn't matter

OpenSim/Region/ScriptEngine/Interfaces/IScriptEngine.cs

@@ -41,6 +41,10 @@ namespace OpenSim.Region.ScriptEngine.Interfaces
     /// An interface for a script API module to communicate with
     /// the engine it's running under
     /// </summary>
+
+    public delegate void ScriptRemoved(UUID script);
+    public delegate void ObjectRemoved(UUID prim);
+
     public interface IScriptEngine
     {
         /// <summary>
@@ -50,6 +54,9 @@ namespace OpenSim.Region.ScriptEngine.Interfaces
 
         Scene World { get; }
 
+        event ScriptRemoved OnScriptRemoved;
+        event ObjectRemoved OnObjectRemoved;
+
         /// <summary>
         /// Post an event to a single script
         /// </summary>

OpenSim/Region/ScriptEngine/Shared/CodeTools/Compiler.cs

@@ -527,8 +527,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
                     break;
                 case enumCompileType.cs:
                 case enumCompileType.lsl:
-                    results = CScodeProvider.CompileAssemblyFromSource(
-                            parameters, Script);
+                    lock (CScodeProvider)
+                    {
+                        results = CScodeProvider.CompileAssemblyFromSource(
+                                parameters, Script);
+                    }
                     break;
                 case enumCompileType.js:
                     results = JScodeProvider.CompileAssemblyFromSource(

OpenSim/Region/ScriptEngine/XEngine/XEngine.cs

@@ -142,6 +142,9 @@ namespace OpenSim.Region.ScriptEngine.XEngine
             get { return m_ScriptConfig; }
         }
 
+        public event ScriptRemoved OnScriptRemoved;
+        public event ObjectRemoved OnObjectRemoved;
+
         //
         // IRegionModule functions
         //
@@ -702,6 +705,8 @@ namespace OpenSim.Region.ScriptEngine.XEngine
                 if (part != null)
                     part.RemoveScriptEvents(itemID);
 
+                bool objectRemoved = false;
+
                 lock (m_PrimObjects)
                 {
                     // Remove the script from it's prim
@@ -715,6 +720,7 @@ namespace OpenSim.Region.ScriptEngine.XEngine
                         if (m_PrimObjects[localID].Count == 0)
                         {
                             m_PrimObjects.Remove(localID);
+                            objectRemoved = true;
                         }
                     }
                 }
@@ -731,8 +737,16 @@ namespace OpenSim.Region.ScriptEngine.XEngine
 
                 instance = null;
 
+                ObjectRemoved handlerObjectRemoved = OnObjectRemoved;
+                if (handlerObjectRemoved != null)
+                    handlerObjectRemoved(part.UUID);
+
                 CleanAssemblies();
             }
+
+            ScriptRemoved handlerScriptRemoved = OnScriptRemoved;
+            if (handlerScriptRemoved != null)
+                handlerScriptRemoved(itemID);
         }
 
         public void OnScriptReset(uint localID, UUID itemID)