SafeMemoryMappedViewHandle.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Win32 / SafeHandles / SafeMemoryMappedViewHandle.cs / 1305376 / SafeMemoryMappedViewHandle.cs

                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  SafeMemoryMappedViewHandle 
**
** Purpose: Safe handle wrapping a MMF view pointer 
**
** Date:  February 7, 2007
**
===========================================================*/ 

using System; 
using System.Runtime.InteropServices; 
using System.Runtime.Versioning;
using System.Security.Permissions; 
using Microsoft.Win32;
using Microsoft.Win32.SafeHandles;

 
namespace Microsoft.Win32.SafeHandles {
 
    // Reliability notes: 
    // ReleaseHandle has reliability guarantee of Cer.Success, as defined by SafeHandle.
    // It gets prepared as a CER at instance construction time. This safe handle doesn't 
    // need to override IsInvalid because the one it inherits from
    // SafeHandleZeroOrMinusOneIsInvalid is correct.

    //  
    // 
    //  
#pragma warning disable 618    // Have not migrated to v4 transparency yet 
    [System.Security.SecurityCritical(System.Security.SecurityCriticalScope.Everything)]
#pragma warning restore 618 
    public sealed class SafeMemoryMappedViewHandle : SafeBuffer {

        [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
        internal SafeMemoryMappedViewHandle() : base(true) { } 

        [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)] 
        internal SafeMemoryMappedViewHandle(IntPtr handle, bool ownsHandle) : base(ownsHandle) { 
            base.SetHandle(handle);
        } 

        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        override protected bool ReleaseHandle() { 
            if (UnsafeNativeMethods.UnmapViewOfFile(handle)) {
                handle = IntPtr.Zero; 
                return true; 
            }
            return false; 
        }
    }

} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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