mcs/class/corlib/System.IO/StreamAsyncResult.cs

   1 //
   2 // System.IO/StreamAsyncResult.cs
   3 //
   4 // Authors:
   5 //   Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (c) 2004 Novell, Inc. (http://www.novell.com)
   8 //
   9
  10 using System.Threading;
  11
  12 namespace System.IO
  13 {
  14         class StreamAsyncResult : IAsyncResult {
  15                 object state;
  16                 bool completed;
  17                 bool done;
  18                 Exception exc;
  19                 int nbytes = -1;
  20                 ManualResetEvent wh;
  21
  22                 public StreamAsyncResult (object state)
  23                 {
  24                         this.state = state;
  25                 }
  26
  27                 public void SetComplete (Exception e)
  28                 {
  29                         exc = e;
  30                         completed = true;
  31                         lock (this) {
  32                                 if (wh != null)
  33                                         wh.Set ();
  34                         }
  35                 }
  36
  37                 public void SetComplete (Exception e, int nbytes)
  38                 {
  39                         this.nbytes = nbytes;
  40                         SetComplete (e);
  41                 }
  42
  43                 public object AsyncState {
  44                         get { return state; }
  45                 }
  46
  47                 public WaitHandle AsyncWaitHandle {
  48                         get {
  49                                 lock (this) {
  50                                         if (wh == null)
  51                                                 wh = new ManualResetEvent (completed);
  52
  53                                         return wh;
  54                                 }
  55                         }
  56                 }
  57
  58                 public virtual bool CompletedSynchronously {
  59                         get { return true; }
  60                 }
  61
  62                 public bool IsCompleted {
  63                         get { return completed; }
  64                 }
  65
  66                 public Exception Exception {
  67                         get { return exc; }
  68                 }
  69
  70                 public int NBytes {
  71                         get { return nbytes; }
  72                 }
  73
  74                 public bool Done {
  75                         get { return done; }
  76                         set { done = value; }
  77                 }
  78         }
  79 }
  80