mcs/class/corlib/System.Runtime.InteropServices/CriticalHandle.cs

   1 //
   2 // System.Runtime.InteropServices.CriticalHandle
   3 //
   4 // Author:
   5 //   Kazuki Oikawa  (kazuki@panicode.com)
   6 //
   7
   8 #if NET_2_0
   9
  10 using System;
  11 using System.Runtime.ConstrainedExecution;
  12 using System.Runtime.Serialization;
  13
  14 namespace System.Runtime.InteropServices
  15 {
  16         public abstract class CriticalHandle : CriticalFinalizerObject, IDisposable
  17         {
  18                 protected IntPtr handle;
  19                 bool _disposed = false;
  20
  21                 protected CriticalHandle (IntPtr invalidHandleValue)
  22                 {
  23                         handle = invalidHandleValue;
  24                 }
  25
  26                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  27                 ~CriticalHandle ()
  28                 {
  29                         Dispose ();
  30                 }
  31
  32                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  33                 public void Close ()
  34                 {
  35                         Dispose ();
  36                 }
  37
  38                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  39                 public void Dispose ()
  40                 {
  41                         if (_disposed)
  42                                 return;
  43
  44                         _disposed = true;
  45                         if (IsInvalid)
  46                                 return;
  47
  48                         if (ReleaseHandle ()) {
  49                                 GC.SuppressFinalize (this);
  50                         } else {
  51                                 // Failed in release...
  52                         }
  53                 }
  54
  55                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  56                 protected abstract bool ReleaseHandle ();
  57
  58                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  59                 protected void SetHandle (IntPtr handle)
  60                 {
  61                         this.handle = handle;
  62                 }
  63
  64                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  65                 public void SetHandleAsInvalid()
  66                 {
  67                         _disposed = true;
  68                 }
  69
  70                 public bool IsClosed {
  71                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  72                         get { return _disposed; }
  73                 }
  74
  75                 public abstract bool IsInvalid {
  76                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  77                         get;
  78                 }
  79         }
  80 }
  81 #endif