From 319ebaca06db3d4a38beff74725d321b7c836157 Mon Sep 17 00:00:00 2001
From: Justin Clark-Casey (justincc)
Date: Tue, 23 Oct 2012 02:44:15 +0100
Subject: Make it possible to turn the base UDP object packet pools on and off
 whilst running via the "debug lludp pool <on|off>" console command.  For
 debug purposes.

This does not currently apply to the higher LLUDP packetpool.
---
 .../Region/ClientStack/Linden/UDP/LLUDPServer.cs   | 103 +++++++++++++++++----
 1 file changed, 86 insertions(+), 17 deletions(-)

(limited to 'OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs')

diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
index bcfd392..14cc863 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
@@ -170,6 +170,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
         private Pool<IncomingPacket> m_incomingPacketPool;
 
+        private Stat m_incomingPacketPoolStat;
+
         private int m_defaultRTO = 0;
         private int m_maxRTO = 0;
         private int m_ackTimeout = 0;
@@ -214,6 +216,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
             m_circuitManager = circuitManager;
             int sceneThrottleBps = 0;
+            bool usePools = false;
 
             IConfig config = configSource.Configs["ClientStack.LindenUDP"];
             if (config != null)
@@ -246,7 +249,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             {
                 PacketPool.Instance.RecyclePackets = packetConfig.GetBoolean("RecyclePackets", true);
                 PacketPool.Instance.RecycleDataBlocks = packetConfig.GetBoolean("RecycleDataBlocks", true);
-                UsePools = packetConfig.GetBoolean("RecycleBaseUDPPackets", false);
+                usePools = packetConfig.GetBoolean("RecycleBaseUDPPackets", usePools);
             }
 
             #region BinaryStats
@@ -277,22 +280,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             m_throttle = new TokenBucket(null, sceneThrottleBps);
             ThrottleRates = new ThrottleRates(configSource);
 
-            if (UsePools)
-            {
-                m_incomingPacketPool = new Pool<IncomingPacket>(() => new IncomingPacket(), 500);
-
-                StatsManager.RegisterStat(
-                    new Stat(
-                        "IncomingPacketPoolCount",
-                        "Objects within incoming packet pool",
-                        "The number of objects currently stored within the incoming packet pool",
-                        "",
-                        "clientstack",
-                        "packetpool",
-                        StatType.Pull,
-                        stat => stat.Value = m_incomingPacketPool.Count,
-                        StatVerbosity.Debug));
-            }
+            if (usePools)
+                EnablePools();
         }
 
         public void Start()
@@ -345,6 +334,50 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             base.StopInbound();
         }
 
+        protected override bool EnablePools()
+        {
+            if (!UsePools)
+            {
+                base.EnablePools();
+
+                m_incomingPacketPool = new Pool<IncomingPacket>(() => new IncomingPacket(), 500);
+
+                m_incomingPacketPoolStat
+                    = new Stat(
+                        "IncomingPacketPoolCount",
+                        "Objects within incoming packet pool",
+                        "The number of objects currently stored within the incoming packet pool",
+                        "",
+                        "clientstack",
+                        "packetpool",
+                        StatType.Pull,
+                        stat => stat.Value = m_incomingPacketPool.Count,
+                        StatVerbosity.Debug);
+
+                StatsManager.RegisterStat(m_incomingPacketPoolStat);
+
+                return true;
+            }
+
+            return false;
+        }
+
+        protected override bool DisablePools()
+        {
+            if (UsePools)
+            {
+                base.DisablePools();
+
+                StatsManager.DeregisterStat(m_incomingPacketPoolStat);
+
+                // We won't null out the pool to avoid a race condition with code that may be in the middle of using it.
+
+                return true;
+            }
+
+            return false;
+        }
+
         /// <summary>
         /// If the outgoing UDP thread times out, then return client that was being processed to help with debugging.
         /// </summary>
@@ -411,6 +444,14 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             MainConsole.Instance.Commands.AddCommand(
                 "Debug",
                 false,
+                "debug lludp pool",
+                "debug lludp pool <on|off>",
+                "Turn object pooling within the lludp component on or off.",
+                HandlePoolCommand);
+
+            MainConsole.Instance.Commands.AddCommand(
+                "Debug",
+                false,
                 "debug lludp status",
                 "debug lludp status",
                 "Return status of LLUDP packet processing.",
@@ -451,6 +492,32 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 StopOutbound();
         }
 
+        private void HandlePoolCommand(string module, string[] args)
+        {
+            if (args.Length != 4)
+            {
+                MainConsole.Instance.Output("Usage: debug lludp pool <on|off>");
+                return;
+            }
+
+            string enabled = args[3];
+
+            if (enabled == "on")
+            {
+                if (EnablePools())
+                    MainConsole.Instance.OutputFormat("Packet pools enabled on {0}", m_scene.Name);
+            }
+            else if (enabled == "off")
+            {
+                if (DisablePools())
+                    MainConsole.Instance.OutputFormat("Packet pools disabled on {0}", m_scene.Name);
+            }
+            else
+            {
+                MainConsole.Instance.Output("Usage: debug lludp pool <on|off>");
+            }
+        }
+
         private void HandleStatusCommand(string module, string[] args)
         {
             MainConsole.Instance.OutputFormat(
@@ -458,6 +525,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
             MainConsole.Instance.OutputFormat(
                 "OUT LLUDP packet processing for {0} is {1}", m_scene.Name, IsRunningOutbound ? "enabled" : "disabled");
+
+            MainConsole.Instance.OutputFormat("LLUDP pools in {0} are {1}", m_scene.Name, UsePools ? "on" : "off");
         }
 
         public bool HandlesRegion(Location x)
-- 
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