From 5e4d6cab00cb29cd088ab7b62ab13aff103b64cb Mon Sep 17 00:00:00 2001
From: onefang
Date: Sun, 19 May 2019 21:24:15 +1000
Subject: Dump OpenSim 0.9.0.1 into it's own branch.

---
 OpenSim/Framework/LocklessQueue.cs | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

(limited to 'OpenSim/Framework/LocklessQueue.cs')

diff --git a/OpenSim/Framework/LocklessQueue.cs b/OpenSim/Framework/LocklessQueue.cs
index 84f887c..21b8178 100644
--- a/OpenSim/Framework/LocklessQueue.cs
+++ b/OpenSim/Framework/LocklessQueue.cs
@@ -29,7 +29,7 @@ using System.Threading;
 
 namespace OpenSim.Framework
 {
-    public sealed class LocklessQueue<T>
+    public class LocklessQueue<T>
     {
         private sealed class SingleLinkNode
         {
@@ -41,7 +41,7 @@ namespace OpenSim.Framework
         SingleLinkNode tail;
         int count;
 
-        public int Count { get { return count; } }
+        public virtual int Count { get { return count; } }
 
         public LocklessQueue()
         {
@@ -76,7 +76,7 @@ namespace OpenSim.Framework
             Interlocked.Increment(ref count);
         }
 
-        public bool Dequeue(out T item)
+        public virtual bool Dequeue(out T item)
         {
             item = default(T);
             SingleLinkNode oldHead = null;
@@ -93,13 +93,16 @@ namespace OpenSim.Framework
                     if (oldHead == oldTail)
                     {
                         if (oldHeadNext == null)
+                        {
+                            count = 0;
                             return false;
+                        }
 
                         CAS(ref tail, oldTail, oldHeadNext);
                     }
                     else
                     {
-                        item = oldHeadNext.Item;                       
+                        item = oldHeadNext.Item;
                         haveAdvancedHead = CAS(ref head, oldHead, oldHeadNext);
                         if (haveAdvancedHead)
                         {
@@ -118,8 +121,7 @@ namespace OpenSim.Framework
         {
             // ugly
             T item;
-            while(count > 0)
-                Dequeue(out item);
+            while(Dequeue(out item));
             Init();
         }
 
@@ -136,4 +138,4 @@ namespace OpenSim.Framework
                 (object)Interlocked.CompareExchange<SingleLinkNode>(ref location, newValue, comparand);
         }
     }
-}
\ No newline at end of file
+}
-- 
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