Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Base / System / Windows / Threading / DispatcherSynchronizationContext.cs / 1 / 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() { DispatcherSynchronizationContext context = new DispatcherSynchronizationContext(_dispatcher); return context; } 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() { DispatcherSynchronizationContext context = new DispatcherSynchronizationContext(_dispatcher); return context; } 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
- ListBindableAttribute.cs
- SaveFileDialog.cs
- RepeaterItem.cs
- ConfigXmlReader.cs
- SQLUtility.cs
- ColumnHeader.cs
- SqlExpressionNullability.cs
- SecurityProtocolCorrelationState.cs
- TerminatorSinks.cs
- OleDbException.cs
- DigitShape.cs
- TextWriterTraceListener.cs
- WebBrowserHelper.cs
- XmlImplementation.cs
- VariableQuery.cs
- safemediahandle.cs
- GetPageCompletedEventArgs.cs
- ViewStateException.cs
- XmlSchemaParticle.cs
- PolyQuadraticBezierSegment.cs
- XmlUtil.cs
- ImageKeyConverter.cs
- GraphicsContainer.cs
- MissingMemberException.cs
- NavigationWindow.cs
- CompareInfo.cs
- SQLDoubleStorage.cs
- DBSchemaRow.cs
- SystemColorTracker.cs
- ButtonChrome.cs
- SapiRecognizer.cs
- Block.cs
- XPathParser.cs
- MdiWindowListItemConverter.cs
- SiteIdentityPermission.cs
- WebResourceAttribute.cs
- AutomationPropertyInfo.cs
- Compiler.cs
- ReadOnlyNameValueCollection.cs
- EventDescriptorCollection.cs
- DayRenderEvent.cs
- HatchBrush.cs
- WebBrowserNavigatingEventHandler.cs
- SystemEvents.cs
- SafeSecurityHelper.cs
- Attributes.cs
- ObjectItemCollectionAssemblyCacheEntry.cs
- ParameterElementCollection.cs
- CdpEqualityComparer.cs
- CounterCreationDataCollection.cs
- ActivityAction.cs
- PageParser.cs
- CuspData.cs
- StrongNamePublicKeyBlob.cs
- DesignerTransaction.cs
- KeyFrames.cs
- Socket.cs
- ObjectPropertyMapping.cs
- TextStore.cs
- ExpressionHelper.cs
- XamlWrappingReader.cs
- ConfigLoader.cs
- EventLogInformation.cs
- ThicknessAnimationUsingKeyFrames.cs
- SQLSingle.cs
- JsonWriter.cs
- ObjectIDGenerator.cs
- TargetConverter.cs
- AnnotationResource.cs
- PersistenceException.cs
- SafeRegistryKey.cs
- Application.cs
- TriState.cs
- NameObjectCollectionBase.cs
- PackagePartCollection.cs
- Separator.cs
- HtmlTextBoxAdapter.cs
- Control.cs
- RelationshipType.cs
- HTTPNotFoundHandler.cs
- StoragePropertyMapping.cs
- ConfigUtil.cs
- Internal.cs
- StateInitialization.cs
- LineGeometry.cs
- ByteRangeDownloader.cs
- WindowsSysHeader.cs
- UIElementPropertyUndoUnit.cs
- MatchSingleFxEngineOpcode.cs
- IUnknownConstantAttribute.cs
- HttpProfileGroupBase.cs
- Operators.cs
- OleDbConnectionPoolGroupProviderInfo.cs
- SQLUtility.cs
- MeshGeometry3D.cs
- PropertiesTab.cs
- XmlSchemaSequence.cs
- ConditionalWeakTable.cs
- TranslateTransform3D.cs
- SmtpMail.cs