Code:
/ 4.0 / 4.0 / untmp / 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- TextRange.cs
- BitStack.cs
- Scripts.cs
- GridViewColumn.cs
- DisplayInformation.cs
- cookiecontainer.cs
- EmbossBitmapEffect.cs
- Zone.cs
- BooleanToVisibilityConverter.cs
- TextElement.cs
- SQLInt32Storage.cs
- PasswordRecovery.cs
- SchemaHelper.cs
- CacheChildrenQuery.cs
- PrivacyNoticeBindingElementImporter.cs
- BrowserCapabilitiesFactory.cs
- Win32KeyboardDevice.cs
- CursorConverter.cs
- StringUtil.cs
- OracleParameterCollection.cs
- __FastResourceComparer.cs
- webeventbuffer.cs
- XmlLoader.cs
- ReceiveContext.cs
- wmiprovider.cs
- ForceCopyBuildProvider.cs
- Bezier.cs
- EpmSyndicationContentSerializer.cs
- GridItemCollection.cs
- MimeImporter.cs
- BamlReader.cs
- ColorComboBox.cs
- ConfigUtil.cs
- ReadOnlyPropertyMetadata.cs
- NavigationPropertyEmitter.cs
- MetadataLocation.cs
- MenuAutoFormat.cs
- Trigger.cs
- MobileResource.cs
- ListViewPagedDataSource.cs
- unitconverter.cs
- UserNamePasswordValidationMode.cs
- SurrogateEncoder.cs
- FileVersion.cs
- SecurityProtocolFactory.cs
- PageThemeParser.cs
- HtmlInputSubmit.cs
- SignedInfo.cs
- EntityConnection.cs
- ProjectionCamera.cs
- ValidatorCompatibilityHelper.cs
- EventInfo.cs
- CodeDirectoryCompiler.cs
- BStrWrapper.cs
- mda.cs
- EmptyQuery.cs
- ConfigurationSectionGroup.cs
- activationcontext.cs
- ArgumentFixer.cs
- ConfigUtil.cs
- OleDbConnection.cs
- ListCollectionView.cs
- ScrollBar.cs
- DeferredTextReference.cs
- SqlFlattener.cs
- BrowserInteropHelper.cs
- mediaeventargs.cs
- HttpRuntimeSection.cs
- EntityCollection.cs
- BoundField.cs
- ClientOptions.cs
- ToolStripMenuItem.cs
- BamlTreeUpdater.cs
- ClientTargetCollection.cs
- UDPClient.cs
- EtwTrackingBehaviorElement.cs
- TextSegment.cs
- StopRoutingHandler.cs
- LinearGradientBrush.cs
- SQLBytes.cs
- FileLevelControlBuilderAttribute.cs
- CollectionChangedEventManager.cs
- Int16Animation.cs
- BufferedGraphics.cs
- StringValueConverter.cs
- HttpResponseInternalWrapper.cs
- TextSegment.cs
- FlowPosition.cs
- DataGridViewRowConverter.cs
- TemplatingOptionsDialog.cs
- Image.cs
- indexingfiltermarshaler.cs
- StorageModelBuildProvider.cs
- TextTreeUndo.cs
- SortKey.cs
- BamlVersionHeader.cs
- BindToObject.cs
- NegationPusher.cs
- VariantWrapper.cs
- BinarySerializer.cs