Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / System / Windows / Media / SafeMILHandle.cs / 2 / SafeMILHandle.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // A safe way to deal with unmanaged MIL interface pointers. //--------------------------------------------------------------------------- using System; using System.IO; using System.Security; using System.Security.Permissions; using System.Collections; using System.Reflection; using MS.Internal; using MS.Win32; using System.Diagnostics; using System.Windows.Media; using System.Runtime; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using Microsoft.Win32.SafeHandles; using Microsoft.Internal; using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods; namespace System.Windows.Media { internal class SafeMILHandle : SafeHandleZeroOrMinusOneIsInvalid { ////// Use this constructor if the handle isn't ready yet and later /// set the handle with SetHandle. SafeMILHandle owns the release /// of the handle. /// ////// Critical: This derives from a class that has a link demand and inheritance demand /// TreatAsSafe: Ok to call constructor /// [SecurityCritical,SecurityTreatAsSafe] internal SafeMILHandle() : base(true) { } ////// Use this constructor if the handle exists at construction time. /// SafeMILHandle owns the release of the parameter. /// ////// Critical: This code calls UpdateEstimatedSize. /// It is used to keep memory around /// [SecurityCritical] internal SafeMILHandle(IntPtr handle, long estimatedSize) : base(true) { SetHandle(handle); // // Hint the GC at the size of the unmanaged memory associated with // this object. We release pressure in the finalizer. // UpdateEstimatedSize(estimatedSize); } ////// Change our size to the new size specified /// ////// Critical: This code calls into AddMemoryPressure and RemoveMemoryPressure /// both of which have link demands. It is used to keep memory around /// [SecurityCritical] internal void UpdateEstimatedSize(long estimatedSize) { if (_gcPressure > 0) { MemoryPressure.Remove(_gcPressure); } _gcPressure = estimatedSize; if (_gcPressure > 0) { MemoryPressure.Add(_gcPressure); } } ////// Critical - calls unmanaged code, not treat as safe because you must /// validate that handle is a valid COM object. /// [SecurityCritical] protected override bool ReleaseHandle() { UnsafeNativeMethods.MILUnknown.ReleaseInterface(ref handle); // // We've released the unmangaed memory, so remove associated // GC pressure. // UpdateEstimatedSize(0); return true; } // // Estimated size in bytes of the unmanaged memory we are holding onto // private long _gcPressure; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // A safe way to deal with unmanaged MIL interface pointers. //--------------------------------------------------------------------------- using System; using System.IO; using System.Security; using System.Security.Permissions; using System.Collections; using System.Reflection; using MS.Internal; using MS.Win32; using System.Diagnostics; using System.Windows.Media; using System.Runtime; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using Microsoft.Win32.SafeHandles; using Microsoft.Internal; using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods; namespace System.Windows.Media { internal class SafeMILHandle : SafeHandleZeroOrMinusOneIsInvalid { ////// Use this constructor if the handle isn't ready yet and later /// set the handle with SetHandle. SafeMILHandle owns the release /// of the handle. /// ////// Critical: This derives from a class that has a link demand and inheritance demand /// TreatAsSafe: Ok to call constructor /// [SecurityCritical,SecurityTreatAsSafe] internal SafeMILHandle() : base(true) { } ////// Use this constructor if the handle exists at construction time. /// SafeMILHandle owns the release of the parameter. /// ////// Critical: This code calls UpdateEstimatedSize. /// It is used to keep memory around /// [SecurityCritical] internal SafeMILHandle(IntPtr handle, long estimatedSize) : base(true) { SetHandle(handle); // // Hint the GC at the size of the unmanaged memory associated with // this object. We release pressure in the finalizer. // UpdateEstimatedSize(estimatedSize); } ////// Change our size to the new size specified /// ////// Critical: This code calls into AddMemoryPressure and RemoveMemoryPressure /// both of which have link demands. It is used to keep memory around /// [SecurityCritical] internal void UpdateEstimatedSize(long estimatedSize) { if (_gcPressure > 0) { MemoryPressure.Remove(_gcPressure); } _gcPressure = estimatedSize; if (_gcPressure > 0) { MemoryPressure.Add(_gcPressure); } } ////// Critical - calls unmanaged code, not treat as safe because you must /// validate that handle is a valid COM object. /// [SecurityCritical] protected override bool ReleaseHandle() { UnsafeNativeMethods.MILUnknown.ReleaseInterface(ref handle); // // We've released the unmangaed memory, so remove associated // GC pressure. // UpdateEstimatedSize(0); return true; } // // Estimated size in bytes of the unmanaged memory we are holding onto // private long _gcPressure; } } // 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
- ToolStripItem.cs
- Substitution.cs
- BaseUriHelper.cs
- CodeAttributeArgumentCollection.cs
- ReadOnlyDictionary.cs
- StrokeNodeOperations.cs
- ValidationErrorCollection.cs
- exports.cs
- MessageQueue.cs
- DataGridViewRowEventArgs.cs
- HttpStreamMessageEncoderFactory.cs
- XPathArrayIterator.cs
- HtmlTableRowCollection.cs
- PreservationFileReader.cs
- DiscoveryClientChannelFactory.cs
- HScrollBar.cs
- SafeViewOfFileHandle.cs
- WebEventCodes.cs
- Hex.cs
- Oid.cs
- GetPageNumberCompletedEventArgs.cs
- RegistryKey.cs
- Decoder.cs
- SchemaUtility.cs
- AccessDataSource.cs
- TableLayoutRowStyleCollection.cs
- MessagePartProtectionMode.cs
- HtmlContainerControl.cs
- StyleConverter.cs
- ObjectConverter.cs
- XmlSchemaAnnotation.cs
- OrderedDictionary.cs
- ClientSettings.cs
- CapabilitiesState.cs
- AuthenticationModuleElement.cs
- ColorMap.cs
- OdbcHandle.cs
- BitmapEffectInputData.cs
- SelectionRange.cs
- DataSourceControl.cs
- TableLayoutSettingsTypeConverter.cs
- KeyFrames.cs
- XmlSerializerFactory.cs
- RenderData.cs
- DbParameterHelper.cs
- util.cs
- XmlNodeChangedEventManager.cs
- WebUtil.cs
- TagMapCollection.cs
- Facet.cs
- WSSecureConversationFeb2005.cs
- DashStyle.cs
- InstanceNotReadyException.cs
- SqlProviderServices.cs
- NamespaceDecl.cs
- String.cs
- AttributeEmitter.cs
- Margins.cs
- BinaryNode.cs
- BitmapScalingModeValidation.cs
- WebPartDeleteVerb.cs
- SessionState.cs
- TypeGeneratedEventArgs.cs
- DataRowView.cs
- XPathNavigator.cs
- DateTimeConverter.cs
- PrintPreviewControl.cs
- LoadWorkflowByInstanceKeyCommand.cs
- SemanticResultKey.cs
- ThemeDirectoryCompiler.cs
- RepeatButton.cs
- MessageSecurityTokenVersion.cs
- ExpressionPrinter.cs
- ContentElement.cs
- ScriptingAuthenticationServiceSection.cs
- SiteMapNodeItemEventArgs.cs
- BaseAsyncResult.cs
- EntitySqlException.cs
- WebBrowserContainer.cs
- InkCanvasFeedbackAdorner.cs
- NetCodeGroup.cs
- WsdlInspector.cs
- ArgumentDesigner.xaml.cs
- Selection.cs
- HttpCapabilitiesEvaluator.cs
- Tablet.cs
- Configuration.cs
- BaseServiceProvider.cs
- ReplacementText.cs
- ApplicationProxyInternal.cs
- FlowDocumentPaginator.cs
- ConstNode.cs
- PenLineCapValidation.cs
- StateMachineWorkflowDesigner.cs
- BlockingCollection.cs
- BmpBitmapEncoder.cs
- ComUdtElement.cs
- ToolStripSeparatorRenderEventArgs.cs
- EnumerableCollectionView.cs
- WindowsHyperlink.cs