mcs/class/corlib/System.Threading/Overlapped.cs

   1 //
   2 // System.Threading.Overlapped.cs
   3 //
   4 // Authors:
   5 //      Dick Porter (dick@ximian.com)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com);
   7 //
   8 // (C) Ximian, Inc.  http://www.ximian.com
   9 // (C) 2004 Novell, Inc. (http://www.novell.com)
  10 //
  11
  12 //
  13 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System.Runtime.InteropServices;
  36 using System.Security.Permissions;
  37
  38 namespace System.Threading
  39 {
  40         public class Overlapped
  41         {
  42                 IAsyncResult ares;
  43                 int offsetL;
  44                 int offsetH;
  45                 int evt;
  46
  47                 public Overlapped ()
  48                 {
  49                 }
  50
  51                 public Overlapped(int offsetLo, int offsetHi, int hEvent, IAsyncResult ar)
  52                 {
  53                         offsetL = offsetLo;
  54                         offsetH = offsetHi;
  55                         evt = hEvent;
  56                         ares = ar;
  57                 }
  58
  59                 [CLSCompliant(false)]
  60                 unsafe public static void Free (NativeOverlapped *nativeOverlappedPtr)
  61                 {
  62                         if ((IntPtr) nativeOverlappedPtr == IntPtr.Zero)
  63                                 throw new ArgumentNullException ("nativeOverlappedPtr");
  64
  65                         Marshal.FreeHGlobal ((IntPtr) nativeOverlappedPtr);
  66                 }
  67
  68                 [CLSCompliant(false)]
  69                 unsafe public static Overlapped Unpack (NativeOverlapped *nativeOverlappedPtr)
  70                 {
  71                         if ((IntPtr) nativeOverlappedPtr == IntPtr.Zero)
  72                                 throw new ArgumentNullException ("nativeOverlappedPtr");
  73
  74                         Overlapped result = new Overlapped ();
  75                         result.offsetL = nativeOverlappedPtr->OffsetLow;
  76                         result.offsetH = nativeOverlappedPtr->OffsetHigh;
  77                         result.evt = nativeOverlappedPtr->EventHandle;
  78                         return result;
  79                 }
  80
  81                 [CLSCompliant(false)]
  82                 [MonoTODO ("Security - we need to propagate the call stack")]
  83                 unsafe public NativeOverlapped *Pack (IOCompletionCallback iocb)
  84                 {
  85                         NativeOverlapped *result = (NativeOverlapped *) Marshal.AllocHGlobal (Marshal.SizeOf (typeof (NativeOverlapped)));
  86                         result->OffsetLow = offsetL;
  87                         result->OffsetHigh = offsetH;
  88                         result->EventHandle = evt;
  89                         return result;
  90                 }
  91
  92                 [CLSCompliant(false)]
  93                 [SecurityPermission (SecurityAction.Demand, ControlEvidence=true, ControlPolicy=true)]
  94                 unsafe public NativeOverlapped *UnsafePack (IOCompletionCallback iocb)
  95                 {
  96                         // no need to propagate the call stack in the unsafe version
  97                         return Pack (iocb);
  98                 }
  99
 100                 public IAsyncResult AsyncResult {
 101                         get { return ares; }
 102                         set { ares = value; }
 103                 }
 104
 105                 public int EventHandle {
 106                         get { return evt; }
 107                         set { evt = value; }
 108                 }
 109
 110                 public int OffsetHigh {
 111                         get { return offsetH; }
 112                         set { offsetH = value; }
 113                 }
 114
 115                 public int OffsetLow {
 116                         get { return offsetL; }
 117                         set { offsetL = value; }
 118                 }
 119         }
 120 }
 121