Terminate 'nothing' behaviour (and potentially others) by signalling using an event rather than polling connection state every 100ms

This kind of polling is very expensive with many bots/polling threads and appears to be the primary cause of bot falloff from the client end at higher loads.
Where inbound packet threads can't run in time due to contention and simulator disconnect timeout occurs.

OpenSim/Tools/pCampBot/Behaviours/AbstractBehaviour.cs

@@ -29,11 +29,12 @@ using OpenMetaverse;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
 using pCampBot.Interfaces;
 
 namespace pCampBot
 {
-    public class AbstractBehaviour : IBehaviour
+    public abstract class AbstractBehaviour : IBehaviour
     {
         /// <summary>
         /// Abbreviated name of this behaviour. 
@@ -44,13 +45,20 @@ namespace pCampBot
 
         public Bot Bot { get; protected set; }
 
-        public virtual void Action() {}
+        public abstract void Action();
+
+        public virtual void Interrupt() {}
+
+        protected AutoResetEvent m_interruptEvent = new AutoResetEvent(false);
 
         public virtual void Initialize(Bot bot)
         {
             Bot = bot;
         }
 
-        public virtual void Close() {}
+        public virtual void Close() 
+        {
+            Interrupt();
+        }
     }
 }

OpenSim/Tools/pCampBot/Behaviours/NoneBehaviour.cs

@@ -43,5 +43,15 @@ namespace pCampBot
             AbbreviatedName = "n";
             Name = "None"; 
         }
+
+        public override void Action()
+        {
+            m_interruptEvent.WaitOne();
+        }
+
+        public override void Interrupt() 
+        {
+            m_interruptEvent.Set();
+        }
     }
 }

OpenSim/Tools/pCampBot/Behaviours/PhysicsBehaviour.cs

@@ -82,6 +82,8 @@ namespace pCampBot
         {
             if (Bot.ConnectionState == ConnectionState.Connected)
                 Bot.Client.Self.Jump(false);
+
+            base.Close();
         }
 
         private string[] readexcuses()

OpenSim/Tools/pCampBot/Bot.cs

@@ -192,35 +192,34 @@ namespace pCampBot
 
         public bool AddBehaviour(IBehaviour behaviour)
         {
-            lock (Behaviours)
-            {
-                if (!Behaviours.ContainsKey(behaviour.AbbreviatedName))
+            Dictionary<string, IBehaviour> updatedBehaviours = new Dictionary<string, IBehaviour>(Behaviours);
+
+            if (!updatedBehaviours.ContainsKey(behaviour.AbbreviatedName))
             {                    
                 behaviour.Initialize(this);
-                    Behaviours.Add(behaviour.AbbreviatedName, behaviour);
+                updatedBehaviours.Add(behaviour.AbbreviatedName, behaviour);
+                Behaviours = updatedBehaviours;
 
                 return true;
             }
-            }
 
             return false;
         }
 
         public bool RemoveBehaviour(string abbreviatedName)
         {
-            lock (Behaviours)
-            {
+            Dictionary<string, IBehaviour> updatedBehaviours = new Dictionary<string, IBehaviour>(Behaviours);
             IBehaviour behaviour;
 
-                if (!Behaviours.TryGetValue(abbreviatedName, out behaviour))
+            if (!updatedBehaviours.TryGetValue(abbreviatedName, out behaviour))
                 return false;
 
             behaviour.Close();
-                Behaviours.Remove(abbreviatedName);
+            updatedBehaviours.Remove(abbreviatedName);
+            Behaviours = updatedBehaviours;
 
             return true;
         }
-        }
 
         private void CreateLibOmvClient()
         {
@@ -278,8 +277,6 @@ namespace pCampBot
         private void Action()
         {
             while (ConnectionState == ConnectionState.Connected)
-            {
-                lock (Behaviours)
             {
                 foreach (IBehaviour behaviour in Behaviours.Values)
                 {
@@ -290,11 +287,6 @@ namespace pCampBot
                 }
             }
 
-                // XXX: This is a really shitty way of yielding so that behaviours can be added/removed
-                Thread.Sleep(100);
-            }
-
-            lock (Behaviours)
             foreach (IBehaviour b in Behaviours.Values)
                 b.Close();
         }
@@ -306,8 +298,8 @@ namespace pCampBot
         {
             ConnectionState = ConnectionState.Disconnecting;
               
-//            if (m_actionThread != null)
-//                m_actionThread.Abort();
+            foreach (IBehaviour behaviour in Behaviours.Values)
+                behaviour.Interrupt();
 
             Client.Network.Logout();
         }

OpenSim/Tools/pCampBot/Interfaces/IBehaviour.cs

@@ -50,6 +50,14 @@ namespace pCampBot.Interfaces
         /// <param name="bot"></param>
         void Initialize(Bot bot);
 
+        /// <summary>
+        /// Interrupt the behaviour.
+        /// </summary>
+        /// <remarks>
+        /// This should cause the current Action call() to terminate if this is active.
+        /// </remarks>
+        void Interrupt();
+
         /// <summary>
         /// Close down this behaviour.
         /// </summary>