Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / System / Windows / Threading / DispatcherSynchronizationContext.cs / 1407647 / DispatcherSynchronizationContext.cs
using System; using System.Threading; using System.Diagnostics; using System.ComponentModel; using System.Security; // CAS using System.Security.Permissions; // Registry permissions namespace System.Windows.Threading { ////// SynchronizationContext subclass used by the Dispatcher. /// public sealed class DispatcherSynchronizationContext : SynchronizationContext { ////// Constructs a new instance of the DispatcherSynchroniazationContext /// using the current Dispatcher. /// public DispatcherSynchronizationContext() : this(Dispatcher.CurrentDispatcher) { } ////// Constructs a new instance of the DispatcherSynchroniazationContext /// using the specified Dispatcher. /// public DispatcherSynchronizationContext(Dispatcher dispatcher) { if(dispatcher == null) { throw new ArgumentNullException("dispatcher"); } _dispatcher = dispatcher; // Tell the CLR to call us when blocking. SetWaitNotificationRequired(); } ////// Synchronously invoke the callback in the SynchronizationContext. /// public override void Send(SendOrPostCallback d, Object state) { _dispatcher.Invoke(DispatcherPriority.Normal, d, state); } ////// Asynchronously invoke the callback in the SynchronizationContext. /// public override void Post(SendOrPostCallback d, Object state) { _dispatcher.BeginInvoke(DispatcherPriority.Normal, d, state); } ////// Wait for a set of handles. /// ////// Critical - Calls WaitForMultipleObjectsEx which has a SUC. /// [SecurityCritical] [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.ControlPolicy|SecurityPermissionFlag.ControlEvidence)] public override int Wait(IntPtr[] waitHandles, bool waitAll, int millisecondsTimeout) { if(_dispatcher._disableProcessingCount > 0) { // Call into native code directly in order to avoid the default // CLR locking behavior which pumps messages under contention. // Even though they try to pump only the COM messages, any // messages that have been SENT to the window are also // dispatched. This can lead to unpredictable reentrancy. return MS.Win32.UnsafeNativeMethods.WaitForMultipleObjectsEx(waitHandles.Length, waitHandles, waitAll, millisecondsTimeout, false); } else { return SynchronizationContext.WaitHelper(waitHandles, waitAll, millisecondsTimeout); } } ////// Create a copy of this SynchronizationContext. /// public override SynchronizationContext CreateCopy() { // Because we do not contain any state that we want to preserve // in seperate instances, we just return the same synchronization // context. The CLR team assures us this is OK. return this; } internal Dispatcher _dispatcher; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System; using System.Threading; using System.Diagnostics; using System.ComponentModel; using System.Security; // CAS using System.Security.Permissions; // Registry permissions namespace System.Windows.Threading { ////// SynchronizationContext subclass used by the Dispatcher. /// public sealed class DispatcherSynchronizationContext : SynchronizationContext { ////// Constructs a new instance of the DispatcherSynchroniazationContext /// using the current Dispatcher. /// public DispatcherSynchronizationContext() : this(Dispatcher.CurrentDispatcher) { } ////// Constructs a new instance of the DispatcherSynchroniazationContext /// using the specified Dispatcher. /// public DispatcherSynchronizationContext(Dispatcher dispatcher) { if(dispatcher == null) { throw new ArgumentNullException("dispatcher"); } _dispatcher = dispatcher; // Tell the CLR to call us when blocking. SetWaitNotificationRequired(); } ////// Synchronously invoke the callback in the SynchronizationContext. /// public override void Send(SendOrPostCallback d, Object state) { _dispatcher.Invoke(DispatcherPriority.Normal, d, state); } ////// Asynchronously invoke the callback in the SynchronizationContext. /// public override void Post(SendOrPostCallback d, Object state) { _dispatcher.BeginInvoke(DispatcherPriority.Normal, d, state); } ////// Wait for a set of handles. /// ////// Critical - Calls WaitForMultipleObjectsEx which has a SUC. /// [SecurityCritical] [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.ControlPolicy|SecurityPermissionFlag.ControlEvidence)] public override int Wait(IntPtr[] waitHandles, bool waitAll, int millisecondsTimeout) { if(_dispatcher._disableProcessingCount > 0) { // Call into native code directly in order to avoid the default // CLR locking behavior which pumps messages under contention. // Even though they try to pump only the COM messages, any // messages that have been SENT to the window are also // dispatched. This can lead to unpredictable reentrancy. return MS.Win32.UnsafeNativeMethods.WaitForMultipleObjectsEx(waitHandles.Length, waitHandles, waitAll, millisecondsTimeout, false); } else { return SynchronizationContext.WaitHelper(waitHandles, waitAll, millisecondsTimeout); } } ////// Create a copy of this SynchronizationContext. /// public override SynchronizationContext CreateCopy() { // Because we do not contain any state that we want to preserve // in seperate instances, we just return the same synchronization // context. The CLR team assures us this is OK. return this; } internal Dispatcher _dispatcher; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- HttpListenerPrefixCollection.cs
- MembershipValidatePasswordEventArgs.cs
- SpStreamWrapper.cs
- ZoneLinkButton.cs
- ObjectReaderCompiler.cs
- Dump.cs
- RouteParametersHelper.cs
- DesignerTransaction.cs
- _emptywebproxy.cs
- URLEditor.cs
- ResXDataNode.cs
- ServiceDescriptionImporter.cs
- ScaleTransform3D.cs
- InkCanvas.cs
- Pens.cs
- cookieexception.cs
- FamilyTypefaceCollection.cs
- WebBrowserNavigatingEventHandler.cs
- TypeCodeDomSerializer.cs
- SmtpSection.cs
- ByteAnimation.cs
- UpdatePanel.cs
- HtmlEmptyTagControlBuilder.cs
- AuthenticationModuleElementCollection.cs
- PopOutPanel.cs
- EnumUnknown.cs
- TargetControlTypeAttribute.cs
- DbException.cs
- DescendantQuery.cs
- IncrementalHitTester.cs
- MobileSysDescriptionAttribute.cs
- TextAnchor.cs
- ComponentDispatcherThread.cs
- XsltLoader.cs
- EditorPart.cs
- NullableIntMinMaxAggregationOperator.cs
- CodeGeneratorOptions.cs
- BevelBitmapEffect.cs
- _UriTypeConverter.cs
- ConstructorArgumentAttribute.cs
- _ReceiveMessageOverlappedAsyncResult.cs
- XmlChildNodes.cs
- InvokeGenerator.cs
- XmlUrlResolver.cs
- ItemsChangedEventArgs.cs
- BuildProviderAppliesToAttribute.cs
- DataListCommandEventArgs.cs
- XmlDictionaryReaderQuotasElement.cs
- StyleSheetComponentEditor.cs
- Rijndael.cs
- InternalSafeNativeMethods.cs
- CodeSnippetTypeMember.cs
- PlacementWorkspace.cs
- VariableExpressionConverter.cs
- GetWinFXPath.cs
- ContainerControl.cs
- OleCmdHelper.cs
- ZipIOExtraFieldElement.cs
- FormatConvertedBitmap.cs
- AsymmetricSignatureDeformatter.cs
- HtmlEmptyTagControlBuilder.cs
- StructuralCache.cs
- LoadedOrUnloadedOperation.cs
- Single.cs
- DataGridViewTopLeftHeaderCell.cs
- LocationEnvironment.cs
- ChildrenQuery.cs
- ellipse.cs
- ObjectItemNoOpAssemblyLoader.cs
- TextRange.cs
- EncryptedPackage.cs
- ScaleTransform.cs
- AjaxFrameworkAssemblyAttribute.cs
- ConfigurationValues.cs
- PersonalizationProviderCollection.cs
- SignatureResourcePool.cs
- CatalogPart.cs
- DateTimeSerializationSection.cs
- Track.cs
- TableColumn.cs
- ArraySet.cs
- RowToFieldTransformer.cs
- Module.cs
- AnnotationObservableCollection.cs
- AsyncCompletedEventArgs.cs
- XmlAttributes.cs
- ArgumentOutOfRangeException.cs
- RichTextBox.cs
- SqlFacetAttribute.cs
- infer.cs
- DataGridAddNewRow.cs
- RangeBaseAutomationPeer.cs
- OperationResponse.cs
- DbProviderFactories.cs
- SingleAnimationBase.cs
- DBCommandBuilder.cs
- Model3DGroup.cs
- EditorBrowsableAttribute.cs
- ConfigurationStrings.cs
- mediapermission.cs