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
- CheckedListBox.cs
- DesignColumn.cs
- XmlAttributeCollection.cs
- DataGridViewSelectedCellCollection.cs
- OdbcParameterCollection.cs
- IApplicationTrustManager.cs
- HashSet.cs
- ZipIOCentralDirectoryFileHeader.cs
- VisualCollection.cs
- Pair.cs
- arc.cs
- TableSectionStyle.cs
- ISAPIWorkerRequest.cs
- DecryptedHeader.cs
- UIntPtr.cs
- Switch.cs
- ProxyHelper.cs
- BitmapEffectCollection.cs
- Object.cs
- XmlSchemaSubstitutionGroup.cs
- Lease.cs
- BamlMapTable.cs
- XmlChoiceIdentifierAttribute.cs
- Dictionary.cs
- GetPageCompletedEventArgs.cs
- Screen.cs
- Rotation3D.cs
- FontUnit.cs
- HybridObjectCache.cs
- CacheSection.cs
- ElementProxy.cs
- ButtonFlatAdapter.cs
- TimestampInformation.cs
- ArgumentValueSerializer.cs
- FixUp.cs
- DeviceContext.cs
- StorageScalarPropertyMapping.cs
- XsltFunctions.cs
- TransactionScope.cs
- CodeVariableReferenceExpression.cs
- UInt16Storage.cs
- KeyTimeConverter.cs
- CheckBox.cs
- StylusTouchDevice.cs
- InternalsVisibleToAttribute.cs
- PrefixHandle.cs
- RemotingAttributes.cs
- _UriTypeConverter.cs
- TwoPhaseCommit.cs
- FormViewPageEventArgs.cs
- BamlLocalizableResourceKey.cs
- ExtensionDataObject.cs
- DefaultValueConverter.cs
- GridViewDeletedEventArgs.cs
- SEHException.cs
- WebPartConnectVerb.cs
- XmlSchemaGroup.cs
- UserControl.cs
- InlineUIContainer.cs
- CopyNamespacesAction.cs
- EnumerableRowCollectionExtensions.cs
- ControlCollection.cs
- SoapServerProtocol.cs
- SimpleHandlerFactory.cs
- AnchoredBlock.cs
- BoundsDrawingContextWalker.cs
- XPathSelfQuery.cs
- GenericRootAutomationPeer.cs
- DataBoundControl.cs
- OracleString.cs
- LogicalExpr.cs
- ListViewInsertedEventArgs.cs
- InputScopeAttribute.cs
- FormsAuthenticationConfiguration.cs
- DrawListViewColumnHeaderEventArgs.cs
- OdbcException.cs
- EntityTypeEmitter.cs
- Descriptor.cs
- CharacterMetricsDictionary.cs
- DataGridViewDataErrorEventArgs.cs
- ProjectionPathSegment.cs
- SafeTimerHandle.cs
- ResXResourceWriter.cs
- InstallerTypeAttribute.cs
- UndoManager.cs
- MappedMetaModel.cs
- CaseInsensitiveHashCodeProvider.cs
- RoleService.cs
- DataGridViewAutoSizeColumnsModeEventArgs.cs
- StylusPlugInCollection.cs
- RecognizerStateChangedEventArgs.cs
- Brush.cs
- SoapParser.cs
- XamlInt32CollectionSerializer.cs
- UnsafePeerToPeerMethods.cs
- ResourcePool.cs
- RelationHandler.cs
- DataSourceSelectArguments.cs
- SystemThemeKey.cs
- EventDrivenDesigner.cs