Added mutex instead of lock for update

OpenSim.RegionServer/world/World.cs

@@ -5,6 +5,7 @@ using System.Collections.Generic;
 using System.Text;
 using System.Reflection;
 using System.IO;
+using System.Threading;
 using OpenSim.Physics.Manager;
 using OpenSim.Framework.Interfaces;
 using OpenSim.Framework.Assets;
@@ -41,7 +42,7 @@ namespace OpenSim.world
         private string m_regionName;
         private InventoryCache _inventoryCache;
         private AssetCache _assetCache;
-        private Object updateLock;
+        private Mutex updateLock;
 
         /// <summary>
         /// Creates a new World class, and a region to go with it.
@@ -53,7 +54,7 @@ namespace OpenSim.world
         {
             try
             {
-                updateLock = null;
+                updateLock = new Mutex(false);
                 m_clientThreads = clientThreads;
                 m_regionHandle = regionHandle;
                 m_regionName = regionName;
@@ -185,8 +186,7 @@ namespace OpenSim.world
         /// </summary>
         public void Update()
         {
-            lock (updateLock)
-            {
+            updateLock.WaitOne();
             try
             {
                 if (this.phyScene.IsThreaded)
@@ -230,7 +230,7 @@ namespace OpenSim.world
             {
                 OpenSim.Framework.Console.MainConsole.Instance.WriteLine("World.cs: Update() - Failed with exception " + e.ToString());
             }
-            }
+            updateLock.ReleaseMutex();
         }
 
         /// <summary>