Overlapped.cs :  » 2.6.4-mono-.net-core » System.Threading » System » Threading » C# / CSharp Open Source

//
// System.Threading.Overlapped.cs
//
// Authors:
//   Dick Porter (dick@ximian.com)
//  Gonzalo Paniagua Javier (gonzalo@ximian.com);
//
// (C) Ximian, Inc.  http://www.ximian.com
// (C) 2004 Novell, Inc. (http://www.novell.com)
//

//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Runtime.InteropServices;
using System.Security.Permissions;

namespace System.Threading{
  [ComVisible (true)]
  public class Overlapped
  {
    IAsyncResult ares;
    int offsetL;
    int offsetH;
    int evt;
    IntPtr evt_ptr;

    public Overlapped ()
    {
    }

    [Obsolete ("Not 64bit compatible.  Please use the constructor that takes IntPtr for the event handle", false)]
    public Overlapped(int offsetLo, int offsetHi, int hEvent, IAsyncResult ar)
    {
      offsetL = offsetLo;
      offsetH = offsetHi;
      evt = hEvent;
      ares = ar;
    }

    public Overlapped (int offsetLo, int offsetHi, IntPtr hEvent,
           IAsyncResult ar)
    {
      offsetL = offsetLo;
      offsetH = offsetHi;
      evt_ptr = hEvent;
      ares = ar;
    }

    [CLSCompliant(false)]
    unsafe public static void Free (NativeOverlapped *nativeOverlappedPtr)
    {
      if ((IntPtr) nativeOverlappedPtr == IntPtr.Zero)
        throw new ArgumentNullException ("nativeOverlappedPtr");

      Marshal.FreeHGlobal ((IntPtr) nativeOverlappedPtr);
    }

    [CLSCompliant(false)]
    unsafe public static Overlapped Unpack (NativeOverlapped *nativeOverlappedPtr)
    {
      if ((IntPtr) nativeOverlappedPtr == IntPtr.Zero)
        throw new ArgumentNullException ("nativeOverlappedPtr");

      Overlapped result = new Overlapped ();
      result.offsetL = nativeOverlappedPtr->OffsetLow;
      result.offsetH = nativeOverlappedPtr->OffsetHigh;
      result.evt = (int)nativeOverlappedPtr->EventHandle;
      return result;
    }

    [CLSCompliant(false)]
    [Obsolete ("Use Pack(iocb, userData) instead", false)]
    [MonoTODO ("Security - we need to propagate the call stack")]
    unsafe public NativeOverlapped *Pack (IOCompletionCallback iocb)
    {
      NativeOverlapped *result = (NativeOverlapped *) Marshal.AllocHGlobal (Marshal.SizeOf (typeof (NativeOverlapped)));
      result->OffsetLow = offsetL;
      result->OffsetHigh = offsetH;
      result->EventHandle = (IntPtr)evt;
      return result;
    }

    [CLSCompliant (false)]
    [ComVisible (false)]
    [MonoTODO ("handle userData")]
    unsafe public NativeOverlapped *Pack (IOCompletionCallback iocb, object userData)
    {
      NativeOverlapped *result = (NativeOverlapped *) Marshal.AllocHGlobal (Marshal.SizeOf(typeof(NativeOverlapped)));
      result->OffsetLow = offsetL;
      result->OffsetHigh = offsetH;
      result->EventHandle = evt_ptr;
      return(result);
    }
    
    [CLSCompliant(false)]
    [Obsolete ("Use UnsafePack(iocb, userData) instead", false)]
    [SecurityPermission (SecurityAction.Demand, ControlEvidence=true, ControlPolicy=true)]
    unsafe public NativeOverlapped *UnsafePack (IOCompletionCallback iocb)
    {
      // no need to propagate the call stack in the unsafe version
      return Pack (iocb);
    }

    [ComVisible (false)]
    [CLSCompliant (false)]
    unsafe public NativeOverlapped *UnsafePack (IOCompletionCallback iocb, object userData)
    {
      return Pack (iocb, userData);
    }

    public IAsyncResult AsyncResult {
      get { return ares; }
      set { ares = value; }
    }

    [Obsolete ("Not 64bit compatible.  Use EventHandleIntPtr instead.", false)]
    public int EventHandle {
      get { return evt; }
      set { evt = value; }
    }

    [ComVisible (false)]
    public IntPtr EventHandleIntPtr 
    {
      get{
        return(evt_ptr);
      }
      set{
        evt_ptr = value;
      }
    }

    public int OffsetHigh {
      get { return offsetH; }
      set { offsetH = value; }
    }

    public int OffsetLow {
      get { return offsetL; }
      set { offsetL = value; }
    }
  }
}