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diff --git a/OpenSim/Region/ScriptEngine/Shared/Instance/Tests/CoopTerminationTests.cs b/OpenSim/Region/ScriptEngine/Shared/Instance/Tests/CoopTerminationTests.cs
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+++ b/OpenSim/Region/ScriptEngine/Shared/Instance/Tests/CoopTerminationTests.cs
@@ -0,0 +1,513 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using Nini.Config;
+using NUnit.Framework;
+using OpenMetaverse;
+using OpenSim.Framework;
+using OpenSim.Region.CoreModules.Scripting.WorldComm;
+using OpenSim.Region.Framework.Scenes;
+using OpenSim.Region.Framework.Interfaces;
+using OpenSim.Region.ScriptEngine.XEngine;
+using OpenSim.Tests.Common;
+using OpenSim.Tests.Common.Mock;
+
+namespace OpenSim.Region.ScriptEngine.Shared.Instance.Tests
+{
+    /// <summary>
+    /// Test that co-operative script thread termination is working correctly.
+    /// </summary>
+    [TestFixture]
+    public class CoopTerminationTests : OpenSimTestCase
+    {
+        private TestScene m_scene;
+        private OpenSim.Region.ScriptEngine.XEngine.XEngine m_xEngine;
+
+        private AutoResetEvent m_chatEvent;
+        private AutoResetEvent m_stoppedEvent;
+
+        private OSChatMessage m_osChatMessageReceived;
+
+        /// <summary>
+        /// Number of chat messages received so far.  Reset before each test.
+        /// </summary>
+        private int m_chatMessagesReceived;
+
+        /// <summary>
+        /// Number of chat messages expected.  m_chatEvent is not fired until this number is reached or exceeded.
+        /// </summary>
+        private int m_chatMessagesThreshold;
+
+        [SetUp]
+        public void Init()
+        {
+            m_osChatMessageReceived = null;
+            m_chatMessagesReceived = 0;
+            m_chatMessagesThreshold = 0;
+            m_chatEvent = new AutoResetEvent(false);
+            m_stoppedEvent = new AutoResetEvent(false);
+
+            //AppDomain.CurrentDomain.SetData("APPBASE", Environment.CurrentDirectory + "/bin");
+//            Console.WriteLine(AppDomain.CurrentDomain.BaseDirectory);
+            m_xEngine = new OpenSim.Region.ScriptEngine.XEngine.XEngine();
+
+            IniConfigSource configSource = new IniConfigSource();
+            
+            IConfig startupConfig = configSource.AddConfig("Startup");
+            startupConfig.Set("DefaultScriptEngine", "XEngine");
+
+            IConfig xEngineConfig = configSource.AddConfig("XEngine");
+            xEngineConfig.Set("Enabled", "true");
+            xEngineConfig.Set("StartDelay", "0");
+
+            // These tests will not run with AppDomainLoading = true, at least on mono.  For unknown reasons, the call
+            // to AssemblyResolver.OnAssemblyResolve fails.
+            xEngineConfig.Set("AppDomainLoading", "false");
+
+            xEngineConfig.Set("ScriptStopStrategy", "co-op");
+
+            // Make sure loops aren't actually being terminated by a script delay wait.
+            xEngineConfig.Set("ScriptDelayFactor", 0);
+
+            // This is really just set for debugging the test.
+            xEngineConfig.Set("WriteScriptSourceToDebugFile", true);
+
+            // Set to false if we need to debug test so the old scripts don't get wiped before each separate test
+//            xEngineConfig.Set("DeleteScriptsOnStartup", false);
+
+            // This is not currently used at all for co-op termination.  Bumping up to demonstrate that co-op termination
+            // has an effect - without it tests will fail due to a 120 second wait for the event to finish.
+            xEngineConfig.Set("WaitForEventCompletionOnScriptStop", 120000);
+
+            m_scene = new SceneHelpers().SetupScene("My Test", TestHelpers.ParseTail(0x9999), 1000, 1000, configSource);
+            SceneHelpers.SetupSceneModules(m_scene, configSource, m_xEngine);
+            m_scene.StartScripts();
+        }
+
+        /// <summary>
+        /// Test co-operative termination on derez of an object containing a script with a long-running event.
+        /// </summary>
+        /// <remarks>
+        /// TODO: Actually compiling the script is incidental to this test.  Really want a way to compile test scripts
+        /// within the build itself.
+        /// </remarks>
+        [Test]
+        public void TestStopOnLongSleep()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        llSay(0, ""Thin Lizzy"");
+        llSleep(60);
+    }
+}";
+
+            TestStop(script);
+        }
+
+        [Test]
+        public void TestNoStopOnSingleStatementForLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;        
+        for (i = 0; i <= 1; i++) llSay(0, ""Iter "" + (string)i);
+    }
+}";
+
+            TestSingleStatementNoStop(script);
+        }
+
+        [Test]
+        public void TestStopOnLongSingleStatementForLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;
+        llSay(0, ""Thin Lizzy"");
+        
+        for (i = 0; i < 2147483647; i++) llSay(0, ""Iter "" + (string)i);
+    }
+}";
+
+            TestStop(script);
+        }
+
+        [Test]
+        public void TestStopOnLongCompoundStatementForLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;
+        llSay(0, ""Thin Lizzy"");
+        
+        for (i = 0; i < 2147483647; i++) 
+        {
+            llSay(0, ""Iter "" + (string)i);
+        }
+    }
+}";
+
+            TestStop(script);
+        }
+
+        [Test]
+        public void TestNoStopOnSingleStatementWhileLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;        
+        while (i < 2) llSay(0, ""Iter "" + (string)i++);
+    }
+}";
+
+            TestSingleStatementNoStop(script);
+        }
+
+        [Test]
+        public void TestStopOnLongSingleStatementWhileLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;
+        llSay(0, ""Thin Lizzy"");
+
+        while (1 == 1)        
+            llSay(0, ""Iter "" + (string)i++);
+    }
+}";
+
+            TestStop(script);
+        }
+
+        [Test]
+        public void TestStopOnLongCompoundStatementWhileLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;
+        llSay(0, ""Thin Lizzy"");
+
+        while (1 == 1) 
+        {
+            llSay(0, ""Iter "" + (string)i++);
+        }
+    }
+}";
+
+            TestStop(script);
+        }
+
+        [Test]
+        public void TestNoStopOnSingleStatementDoWhileLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;
+
+        do llSay(0, ""Iter "" + (string)i++);
+        while (i < 2);
+    }
+}";
+
+            TestSingleStatementNoStop(script);
+        }
+
+        [Test]
+        public void TestStopOnLongSingleStatementDoWhileLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;
+        llSay(0, ""Thin Lizzy"");
+
+        do llSay(0, ""Iter "" + (string)i++);
+        while (1 == 1);
+    }
+}";
+
+            TestStop(script);
+        }
+
+        [Test]
+        public void TestStopOnLongCompoundStatementDoWhileLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;
+        llSay(0, ""Thin Lizzy"");
+
+        do 
+        {
+            llSay(0, ""Iter "" + (string)i++);
+        } while (1 == 1);
+    }
+}";
+
+            TestStop(script);
+        }
+
+        [Test]
+        public void TestStopOnInfiniteJumpLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;
+        llSay(0, ""Thin Lizzy"");
+
+        @p1;      
+        llSay(0, ""Iter "" + (string)i++);
+        jump p1;
+    }
+}";
+
+            TestStop(script);
+        }
+
+        // Disabling for now as these are not particularly useful tests (since they fail due to stack overflow before
+        // termination can even be tried.
+//        [Test]
+        public void TestStopOnInfiniteUserFunctionCallLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"
+integer i = 0;
+
+ufn1()
+{
+  llSay(0, ""Iter ufn1() "" + (string)i++);
+  ufn1();
+}
+
+default
+{    
+    state_entry()
+    {
+        integer i = 0;
+        llSay(0, ""Thin Lizzy"");
+
+        ufn1();
+    }
+}";
+
+            TestStop(script);
+        }
+
+        // Disabling for now as these are not particularly useful tests (since they fail due to stack overflow before
+        // termination can even be tried.
+//        [Test]
+        public void TestStopOnInfiniteManualEventCallLoop()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string script = 
+@"default
+{    
+    state_entry()
+    {
+        integer i = 0;
+        llSay(0, ""Thin Lizzy"");
+
+        llSay(0, ""Iter"" + (string)i++);
+        default_event_state_entry();
+    }
+}";
+
+            TestStop(script);
+        }
+
+        private SceneObjectPart CreateScript(string script, string itemName, UUID userId)
+        {
+//            UUID objectId = TestHelpers.ParseTail(0x100);
+//            UUID itemId = TestHelpers.ParseTail(0x3);
+
+            SceneObjectGroup so 
+                = SceneHelpers.CreateSceneObject(1, userId, string.Format("Object for {0}", itemName), 0x100);
+            m_scene.AddNewSceneObject(so, true);
+
+            InventoryItemBase itemTemplate = new InventoryItemBase();
+//            itemTemplate.ID = itemId;
+            itemTemplate.Name = itemName;
+            itemTemplate.Folder = so.UUID;
+            itemTemplate.InvType = (int)InventoryType.LSL;
+
+            m_scene.EventManager.OnChatFromWorld += OnChatFromWorld;
+
+            return m_scene.RezNewScript(userId, itemTemplate, script);
+        }
+
+        private void TestSingleStatementNoStop(string script)
+        {
+            // In these tests we expect to see at least 2 chat messages to confirm that the loop is working properly.
+            m_chatMessagesThreshold = 2;
+
+            UUID userId = TestHelpers.ParseTail(0x1);
+//            UUID objectId = TestHelpers.ParseTail(0x100);
+//            UUID itemId = TestHelpers.ParseTail(0x3);
+            string itemName = "TestNoStop";
+
+            SceneObjectPart partWhereRezzed = CreateScript(script, itemName, userId);
+
+            // Wait for the script to start the event before we try stopping it.
+            m_chatEvent.WaitOne(60000);
+
+            if (m_osChatMessageReceived == null)
+                Assert.Fail("Script did not start");
+            else
+                Assert.That(m_chatMessagesReceived, Is.EqualTo(2));
+
+            bool running;
+            TaskInventoryItem scriptItem = partWhereRezzed.Inventory.GetInventoryItem(itemName);
+            Assert.That(
+                SceneObjectPartInventory.TryGetScriptInstanceRunning(m_scene, scriptItem, out running), Is.True);
+            Assert.That(running, Is.True);
+        }
+
+        private void TestStop(string script)
+        {
+            // In these tests we're only interested in the first message to confirm that the script has started.
+            m_chatMessagesThreshold = 1;
+
+            UUID userId = TestHelpers.ParseTail(0x1);
+//            UUID objectId = TestHelpers.ParseTail(0x100);
+//            UUID itemId = TestHelpers.ParseTail(0x3);
+            string itemName = "TestStop";
+
+            SceneObjectPart partWhereRezzed = CreateScript(script, itemName, userId);
+            TaskInventoryItem rezzedItem = partWhereRezzed.Inventory.GetInventoryItem(itemName);
+
+            // Wait for the script to start the event before we try stopping it.
+            m_chatEvent.WaitOne(60000);
+
+            if (m_osChatMessageReceived != null)
+                Console.WriteLine("Script started with message [{0}]", m_osChatMessageReceived.Message);
+            else
+                Assert.Fail("Script did not start");
+
+            // FIXME: This is a very poor way of trying to avoid a low-probability race condition where the script
+            // executes llSay() but has not started the next statement before we try to stop it.
+            Thread.Sleep(1000);
+
+            // We need a way of carrying on if StopScript() fail, since it won't return if the script isn't actually
+            // stopped.  This kind of multi-threading is far from ideal in a regression test.
+            new Thread(() => { m_xEngine.StopScript(rezzedItem.ItemID); m_stoppedEvent.Set(); }).Start();
+
+            if (!m_stoppedEvent.WaitOne(30000))
+                Assert.Fail("Script did not co-operatively stop.");
+
+            bool running;
+            TaskInventoryItem scriptItem = partWhereRezzed.Inventory.GetInventoryItem(itemName);
+            Assert.That(
+                SceneObjectPartInventory.TryGetScriptInstanceRunning(m_scene, scriptItem, out running), Is.True);
+            Assert.That(running, Is.False);
+        }
+
+        private void OnChatFromWorld(object sender, OSChatMessage oscm)
+        {
+            Console.WriteLine("Got chat [{0}]", oscm.Message);
+            m_osChatMessageReceived = oscm;
+
+            if (++m_chatMessagesReceived >= m_chatMessagesThreshold)
+            {
+                m_scene.EventManager.OnChatFromWorld -= OnChatFromWorld;            
+                m_chatEvent.Set();
+            }
+        }
+    }
+}
\ No newline at end of file