Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / IO / MemoryMappedFiles / MemoryMappedViewAccessor.cs / 1305376 / MemoryMappedViewAccessor.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: MemoryMappedViewAccessor ** ** Purpose: View accessor for managed MemoryMappedFiles ** ** Date: February 7, 2007 ** ===========================================================*/ using System; using System.Diagnostics; using System.Security.Permissions; using Microsoft.Win32.SafeHandles; namespace System.IO.MemoryMappedFiles { public sealed class MemoryMappedViewAccessor : UnmanagedMemoryAccessor { private MemoryMappedView m_view; //// [System.Security.SecurityCritical] internal MemoryMappedViewAccessor(MemoryMappedView view) { Debug.Assert(view != null, "view is null"); m_view = view; Initialize(m_view.ViewHandle, m_view.PointerOffset, m_view.Size, MemoryMappedFile.GetFileAccess(m_view.Access)); } public SafeMemoryMappedViewHandle SafeMemoryMappedViewHandle { //// // // // [System.Security.SecurityCritical] [SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)] get { return m_view != null ? m_view.ViewHandle : null; } } //// // [System.Security.SecurityCritical] protected override void Dispose(bool disposing) { try { // Explicitly flush the changes. The OS will do this for us anyway, but not until after the // MemoryMappedFile object itself is closed. if (disposing && m_view != null && !m_view.IsClosed) { Flush(); } } finally { try { if (m_view != null) { m_view.Dispose(); } } finally { base.Dispose(disposing); } } } // Flushes the changes such that they are in [....] with the FileStream bits (ones obtained // with the win32 ReadFile and WriteFile functions). Need to call FileStream's Flush to // flush to the disk. // NOTE: This will flush all bytes before and after the view up until an offset that is a // multiple of SystemPageSize. //// // [System.Security.SecurityCritical] public void Flush() { if (!IsOpen) { throw new ObjectDisposedException("MemoryMappedViewAccessor", SR.GetString(SR.ObjectDisposed_ViewAccessorClosed)); } unsafe { if (m_view != null) { m_view.Flush((IntPtr)Capacity); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.//
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