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 (false);
  30                 }
  31
  32                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  33                 public void Close ()
  34                 {
  35                         Dispose (true);
  36                 }
  37
  38                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  39                 public void Dispose ()
  40                 {
  41                         Dispose (true);
  42                 }
  43
  44                 public void Dispose (bool disposing)
  45                 {
  46                         if (_disposed)
  47                                 return;
  48
  49                         _disposed = true;
  50                         if (IsInvalid)
  51                                 return;
  52
  53                         if (disposing == true){
  54                                 if (ReleaseHandle ()) {
  55                                         GC.SuppressFinalize (this);
  56                                 } else {
  57                                         // Failed in release...
  58                                 }
  59                         }
  60                 }
  61
  62                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  63                 protected abstract bool ReleaseHandle ();
  64
  65                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  66                 protected void SetHandle (IntPtr handle)
  67                 {
  68                         this.handle = handle;
  69                 }
  70
  71                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  72                 public void SetHandleAsInvalid()
  73                 {
  74                         _disposed = true;
  75                 }
  76
  77                 public bool IsClosed {
  78                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  79                         get { return _disposed; }
  80                 }
  81
  82                 public abstract bool IsInvalid {
  83                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  84                         get;
  85                 }
  86         }
  87 }
  88 #endif