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

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