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[release/8.0] ComponentModel threading fixes (#107353)
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@steveharter
steveharter authored Sep 5, 2024
1 parent 8072b23 commit e2e089c
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Showing 5 changed files with 107 additions and 87 deletions.
1 change: 1 addition & 0 deletions ...raries/System.ComponentModel.TypeConverter/src/System.ComponentModel.TypeConverter.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -253,6 +253,7 @@
SetTargetFramework="TargetFramework=netstandard2.0"
OutputItemType="Analyzer" />
<Reference Include="System.Collections" />
<Reference Include="System.Collections.Concurrent" />
<Reference Include="System.Collections.NonGeneric" />
<Reference Include="System.Collections.Specialized" />
<Reference Include="System.ComponentModel" />
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35 changes: 22 additions & 13 deletions ...aries/System.ComponentModel.TypeConverter/src/System/ComponentModel/PropertyDescriptor.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,9 +2,11 @@
// The .NET Foundation licenses this file to you under the MIT license.

using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Reflection;
using System.Threading;

namespace System.ComponentModel
{
Expand All @@ -16,10 +18,11 @@ public abstract class PropertyDescriptor : MemberDescriptor
internal const string PropertyDescriptorPropertyTypeMessage = "PropertyDescriptor's PropertyType cannot be statically discovered.";

private TypeConverter? _converter;
private Dictionary<object, EventHandler?>? _valueChangedHandlers;
private ConcurrentDictionary<object, EventHandler?>? _valueChangedHandlers;
private object?[]? _editors;
private Type[]? _editorTypes;
private int _editorCount;
private object? _syncObject;

/// <summary>
/// Initializes a new instance of the <see cref='System.ComponentModel.PropertyDescriptor'/> class with the specified name and
Expand Down Expand Up @@ -49,6 +52,8 @@ protected PropertyDescriptor(MemberDescriptor descr, Attribute[]? attrs) : base(
{
}

private object SyncObject => LazyInitializer.EnsureInitialized(ref _syncObject);

/// <summary>
/// When overridden in a derived class, gets the type of the
/// component this property is bound to.
Expand Down Expand Up @@ -124,10 +129,11 @@ public virtual void AddValueChanged(object component, EventHandler handler)
ArgumentNullException.ThrowIfNull(component);
ArgumentNullException.ThrowIfNull(handler);

_valueChangedHandlers ??= new Dictionary<object, EventHandler?>();

EventHandler? h = _valueChangedHandlers.GetValueOrDefault(component, defaultValue: null);
_valueChangedHandlers[component] = (EventHandler?)Delegate.Combine(h, handler);
lock (SyncObject)
{
_valueChangedHandlers ??= new ConcurrentDictionary<object, EventHandler?>(concurrencyLevel: 1, capacity: 0);
_valueChangedHandlers.AddOrUpdate(component, handler, (k, v) => (EventHandler?)Delegate.Combine(v, handler));
}
}

/// <summary>
Expand Down Expand Up @@ -392,15 +398,18 @@ public virtual void RemoveValueChanged(object component, EventHandler handler)

if (_valueChangedHandlers != null)
{
EventHandler? h = _valueChangedHandlers.GetValueOrDefault(component, defaultValue: null);
h = (EventHandler?)Delegate.Remove(h, handler);
if (h != null)
{
_valueChangedHandlers[component] = h;
}
else
lock (SyncObject)
{
_valueChangedHandlers.Remove(component);
EventHandler? h = _valueChangedHandlers.GetValueOrDefault(component, defaultValue: null);
h = (EventHandler?)Delegate.Remove(h, handler);
if (h != null)
{
_valueChangedHandlers[component] = h;
}
else
{
_valueChangedHandlers.Remove(component, out EventHandler? _);
}
}
}
}
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62 changes: 21 additions & 41 deletions ....ComponentModel.TypeConverter/src/System/ComponentModel/ReflectTypeDescriptionProvider.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@

using System.Collections;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.ComponentModel.Design;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
Expand All @@ -22,10 +23,8 @@ namespace System.ComponentModel
/// </summary>
internal sealed partial class ReflectTypeDescriptionProvider : TypeDescriptionProvider
{
// Hastable of Type -> ReflectedTypeData. ReflectedTypeData contains all
// of the type information we have gathered for a given type.
//
private Hashtable? _typeData;
// ReflectedTypeData contains all of the type information we have gathered for a given type.
private readonly ConcurrentDictionary<Type, ReflectedTypeData> _typeData = new ConcurrentDictionary<Type, ReflectedTypeData>();

// This is the signature we look for when creating types that are generic, but
// want to know what type they are dealing with. Enums are a good example of this;
Expand Down Expand Up @@ -91,8 +90,6 @@ private static Type[] InitializeSkipInterfaceAttributeList()

internal static Guid ExtenderProviderKey { get; } = Guid.NewGuid();


private static readonly object s_internalSyncObject = new object();
/// <summary>
/// Creates a new ReflectTypeDescriptionProvider. The type is the
/// type we will obtain type information for.
Expand Down Expand Up @@ -243,7 +240,7 @@ internal static void AddEditorTable(Type editorBaseType, Hashtable table)

Debug.Assert(table != null, "COMPAT: Editor table should not be null"); // don't throw; RTM didn't so we can't do it either.

lock (s_internalSyncObject)
lock (TypeDescriptor.s_commonSyncObject)
{
Hashtable editorTables = EditorTables;
if (!editorTables.ContainsKey(editorBaseType))
Expand Down Expand Up @@ -298,7 +295,6 @@ internal static void AddEditorTable(Type editorBaseType, Hashtable table)
return obj ?? Activator.CreateInstance(objectType, args);
}


/// <summary>
/// Helper method to create editors and type converters. This checks to see if the
/// type implements a Type constructor, and if it does it invokes that ctor.
Expand Down Expand Up @@ -429,7 +425,7 @@ internal TypeConverter GetConverter([DynamicallyAccessedMembers(DynamicallyAcces
//
if (table == null)
{
lock (s_internalSyncObject)
lock (TypeDescriptor.s_commonSyncObject)
{
table = editorTables[editorBaseType];
if (table == null)
Expand Down Expand Up @@ -837,22 +833,11 @@ internal Type[] GetPopulatedTypes(Module module)
{
List<Type> typeList = new List<Type>();

lock (s_internalSyncObject)
foreach (KeyValuePair<Type, ReflectedTypeData> kvp in _typeData)
{
Hashtable? typeData = _typeData;
if (typeData != null)
if (kvp.Key.Module == module && kvp.Value!.IsPopulated)
{
// Manual use of IDictionaryEnumerator instead of foreach to avoid DictionaryEntry box allocations.
IDictionaryEnumerator e = typeData.GetEnumerator();
while (e.MoveNext())
{
DictionaryEntry de = e.Entry;
Type type = (Type)de.Key;
if (type.Module == module && ((ReflectedTypeData)de.Value!).IsPopulated)
{
typeList.Add(type);
}
}
typeList.Add(kvp.Key);
}
}

Expand Down Expand Up @@ -897,28 +882,23 @@ public override Type GetReflectionType(
/// </summary>
private ReflectedTypeData? GetTypeData([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] Type type, bool createIfNeeded)
{
ReflectedTypeData? td = null;

if (_typeData != null)
if (_typeData.TryGetValue(type, out ReflectedTypeData? td))
{
td = (ReflectedTypeData?)_typeData[type];
if (td != null)
{
return td;
}
Debug.Assert(td != null);
return td;
}

lock (s_internalSyncObject)
lock (TypeDescriptor.s_commonSyncObject)
{
if (_typeData != null)
if (_typeData.TryGetValue(type, out td))
{
td = (ReflectedTypeData?)_typeData[type];
Debug.Assert(td != null);
return td;
}

if (td == null && createIfNeeded)
if (createIfNeeded)
{
td = new ReflectedTypeData(type);
_typeData ??= new Hashtable();
_typeData[type] = td;
}
}
Expand Down Expand Up @@ -1006,7 +986,7 @@ internal static Attribute[] ReflectGetAttributes(Type type)
return attrs;
}

lock (s_internalSyncObject)
lock (TypeDescriptor.s_commonSyncObject)
{
attrs = (Attribute[]?)attributeCache[type];
if (attrs == null)
Expand Down Expand Up @@ -1034,7 +1014,7 @@ internal static Attribute[] ReflectGetAttributes(MemberInfo member)
return attrs;
}

lock (s_internalSyncObject)
lock (TypeDescriptor.s_commonSyncObject)
{
attrs = (Attribute[]?)attributeCache[member];
if (attrs == null)
Expand Down Expand Up @@ -1063,7 +1043,7 @@ private static EventDescriptor[] ReflectGetEvents(
return events;
}

lock (s_internalSyncObject)
lock (TypeDescriptor.s_commonSyncObject)
{
events = (EventDescriptor[]?)eventCache[type];
if (events == null)
Expand Down Expand Up @@ -1160,7 +1140,7 @@ private static PropertyDescriptor[] ReflectGetExtendedProperties(IExtenderProvid
ReflectPropertyDescriptor[]? extendedProperties = (ReflectPropertyDescriptor[]?)extendedPropertyCache[providerType];
if (extendedProperties == null)
{
lock (s_internalSyncObject)
lock (TypeDescriptor.s_commonSyncObject)
{
extendedProperties = (ReflectPropertyDescriptor[]?)extendedPropertyCache[providerType];

Expand Down Expand Up @@ -1240,7 +1220,7 @@ private static PropertyDescriptor[] ReflectGetProperties(
return properties;
}

lock (s_internalSyncObject)
lock (TypeDescriptor.s_commonSyncObject)
{
properties = (PropertyDescriptor[]?)propertyCache[type];

Expand Down
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