Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Core / CSharp / System / Windows / Media / SafeMILHandle.cs / 1 / 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
- SRGSCompiler.cs
- SRef.cs
- DataGridSortingEventArgs.cs
- RectangleConverter.cs
- StyleXamlParser.cs
- MaskedTextBoxDesignerActionList.cs
- RegularExpressionValidator.cs
- WebEventTraceProvider.cs
- IfJoinedCondition.cs
- SoapSchemaMember.cs
- ApplicationTrust.cs
- HtmlTable.cs
- CoTaskMemHandle.cs
- DrawingAttributeSerializer.cs
- TaskHelper.cs
- TypedDataSetSchemaImporterExtension.cs
- ConsoleTraceListener.cs
- ArgumentNullException.cs
- ProcessInfo.cs
- CodePageUtils.cs
- HandlerWithFactory.cs
- PeerObject.cs
- TypeHelpers.cs
- DataViewSetting.cs
- ContextMenuStripActionList.cs
- Script.cs
- FileLogRecord.cs
- FileDetails.cs
- ThicknessAnimationBase.cs
- ProfileProvider.cs
- PointAnimationBase.cs
- WindowsIPAddress.cs
- LogLogRecord.cs
- ClientConvert.cs
- SoapMessage.cs
- tibetanshape.cs
- SqlDataSourceConfigureSortForm.cs
- DataTableExtensions.cs
- MemberAccessException.cs
- XmlCharCheckingWriter.cs
- ParamArrayAttribute.cs
- MarkupExtensionReturnTypeAttribute.cs
- ProjectionPathSegment.cs
- ListBoxAutomationPeer.cs
- ScrollEvent.cs
- StaticFileHandler.cs
- CodeTypeMemberCollection.cs
- GradientBrush.cs
- ObsoleteAttribute.cs
- DesignTimeResourceProviderFactoryAttribute.cs
- LinkConverter.cs
- ToolbarAUtomationPeer.cs
- InheritanceService.cs
- SoapObjectReader.cs
- DataGridCell.cs
- CellConstant.cs
- RelatedEnd.cs
- Resources.Designer.cs
- WebPartEditVerb.cs
- UpdateCompiler.cs
- ResourceReferenceKeyNotFoundException.cs
- MediaPlayer.cs
- MissingSatelliteAssemblyException.cs
- ListMarkerLine.cs
- ByteConverter.cs
- ResourceReferenceExpression.cs
- CodeBinaryOperatorExpression.cs
- DbMetaDataFactory.cs
- Selection.cs
- x509utils.cs
- Style.cs
- RectangleF.cs
- Bitmap.cs
- ScrollChrome.cs
- SessionEndingEventArgs.cs
- StaticExtension.cs
- StringArrayConverter.cs
- _TransmitFileOverlappedAsyncResult.cs
- VectorConverter.cs
- DataGridViewUtilities.cs
- TriState.cs
- XmlElementAttributes.cs
- StandardBindingImporter.cs
- ManagedIStream.cs
- ScaleTransform.cs
- PreservationFileWriter.cs
- ColorConverter.cs
- hebrewshape.cs
- TextLineResult.cs
- XPathPatternBuilder.cs
- LinqToSqlWrapper.cs
- SecurityHelper.cs
- VisualTreeHelper.cs
- GroupLabel.cs
- mansign.cs
- RegexStringValidator.cs
- SqlInternalConnectionTds.cs
- ObjectViewQueryResultData.cs
- EnumValidator.cs
- ProtocolViolationException.cs