1 files changed, 6 insertions, 2 deletions

diff --git a/OpenSim/Region/CoreModules/Asset/FlotsamAssetCache.cs b/OpenSim/Region/CoreModules/Asset/FlotsamAssetCache.cs
index 127ca1d..7054825 100644
--- a/OpenSim/Region/CoreModules/Asset/FlotsamAssetCache.cs
+++ b/OpenSim/Region/CoreModules/Asset/FlotsamAssetCache.cs
@@ -83,7 +83,7 @@ namespace Flotsam.RegionModules.AssetCache
         private Dictionary<string, ManualResetEvent> m_CurrentlyWriting = new Dictionary<string, ManualResetEvent>();
         private int m_WaitOnInprogressTimeout = 3000;
 #else
-        private List<string> m_CurrentlyWriting = new List<string>();
+        private HashSet<string> m_CurrentlyWriting = new HashSet<string>();
 #endif
 
         private bool m_FileCacheEnabled = true;
@@ -272,7 +272,11 @@ namespace Flotsam.RegionModules.AssetCache
                         // the other thread has updated the time for us.
                         try
                         {
-                            File.SetLastAccessTime(filename, DateTime.Now);
+                            lock (m_CurrentlyWriting)
+                            {
+                                if (!m_CurrentlyWriting.Contains(filename))
+                                    File.SetLastAccessTime(filename, DateTime.Now);
+                            }
                         }
                         catch
                         {