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Adjust the locking on InventoryCache. Locking for r/w of the ExpiringCache isn't needed since it's thread safe but r/w of contained dictionaries isn't thread-safe

cpu-performance
Justin Clark-Casey (justincc) 2013-06-15 00:34:45 +01:00
parent da3724a904
commit 720806b661
1 changed files with 23 additions and 14 deletions
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37
OpenSim/Region/CoreModules/ServiceConnectorsOut/Inventory/InventoryCache.cs
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@ -1,11 +1,14 @@
using System;
using System.Collections.Generic;
using System.Threading;
using OpenSim.Framework;
using OpenMetaverse;
namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Inventory
{
/// <summary>
/// Cache root and system inventory folders to reduce number of potentially remote inventory calls and associated holdups.
/// </summary>
public class InventoryCache
{
private const double CACHE_EXPIRATION_SECONDS = 3600.0; // 1 hour
@ -16,8 +19,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Inventory
public void Cache(UUID userID, InventoryFolderBase root)
{
lock (m_RootFolders)
m_RootFolders.AddOrUpdate(userID, root, CACHE_EXPIRATION_SECONDS);
m_RootFolders.AddOrUpdate(userID, root, CACHE_EXPIRATION_SECONDS);
}
public InventoryFolderBase GetRootFolder(UUID userID)
@ -31,14 +33,18 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Inventory
public void Cache(UUID userID, AssetType type, InventoryFolderBase folder)
{
lock (m_FolderTypes)
Dictionary<AssetType, InventoryFolderBase> ff = null;
if (!m_FolderTypes.TryGetValue(userID, out ff))
{
ff = new Dictionary<AssetType, InventoryFolderBase>();
m_FolderTypes.Add(userID, ff, CACHE_EXPIRATION_SECONDS);
}
// We need to lock here since two threads could potentially retrieve the same dictionary
// and try to add a folder for that type simultaneously. Dictionary<>.Add() is not described as thread-safe in the SDK
// even if the folders are identical.
lock (ff)
{
Dictionary<AssetType, InventoryFolderBase> ff = null;
if (!m_FolderTypes.TryGetValue(userID, out ff))
{
ff = new Dictionary<AssetType, InventoryFolderBase>();
m_FolderTypes.Add(userID, ff, CACHE_EXPIRATION_SECONDS);
}
if (!ff.ContainsKey(type))
ff.Add(type, folder);
}
@ -50,8 +56,12 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Inventory
if (m_FolderTypes.TryGetValue(userID, out ff))
{
InventoryFolderBase f = null;
if (ff.TryGetValue(type, out f))
return f;
lock (ff)
{
if (ff.TryGetValue(type, out f))
return f;
}
}
return null;
@ -59,8 +69,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Inventory
public void Cache(UUID userID, InventoryCollection inv)
{
lock (m_Inventories)
m_Inventories.AddOrUpdate(userID, inv, 120);
m_Inventories.AddOrUpdate(userID, inv, 120);
}
public InventoryCollection GetUserInventory(UUID userID)