Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / 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.InteropServices; using System.Runtime.CompilerServices; using Microsoft.Win32.SafeHandles; 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 unmanaged 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.
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