mcs/class/Managed.Windows.Forms/System.Windows.Forms/AsyncMethodResult.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2004 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jackson Harper (jackson@ximian.com)
  24
  25
  26 using System;
  27 using System.Threading;
  28
  29 namespace System.Windows.Forms {
  30
  31         internal class AsyncMethodResult : IAsyncResult {
  32
  33                 private ManualResetEvent handle;
  34                 private object state;
  35                 private bool completed;
  36                 private object return_value;
  37
  38                 public AsyncMethodResult ()
  39                 {
  40                         handle = new ManualResetEvent (false);
  41                 }
  42
  43                 public virtual WaitHandle AsyncWaitHandle {
  44                         get {
  45                                 lock (this) {
  46                                         return handle;
  47                                 }
  48                         }
  49                 }
  50
  51                 public object AsyncState {
  52                         get { return state; }
  53                         set { state = value; }
  54                 }
  55
  56                 public bool CompletedSynchronously {
  57                         get { return false; }
  58                 }
  59
  60                 public bool IsCompleted {
  61                         get {
  62                                 lock (this) {
  63                                         return completed;
  64                                 }
  65                         }
  66                 }
  67
  68                 public object EndInvoke ()
  69                 {
  70                         lock (this) {
  71                                 if (completed)
  72                                         return return_value;
  73                         }
  74                         handle.WaitOne ();
  75                         return return_value;
  76                 }
  77
  78                 public void Complete (object result)
  79                 {
  80                         lock (this) {
  81                                 completed = true;
  82                                 return_value = result;
  83                                 handle.Set ();
  84                         }
  85                 }
  86         }
  87
  88 }
  89
  90