mcs/class/System.ComponentModel.Composition/src/ComponentModel/Microsoft/Internal/Lock.cs

   1 // -----------------------------------------------------------------------\r
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.\r
   3 // -----------------------------------------------------------------------\r
   4 using System;\r
   5 using System.Collections.Generic;\r
   6 using System.Linq;\r
   7 using System.Text;\r
   8 using System.Threading;\r
   9 \r
  10 namespace Microsoft.Internal\r
  11 {\r
  12     internal sealed class Lock : IDisposable\r
  13     {\r
  14 #if (!SILVERLIGHT)\r
  15         private ReaderWriterLockSlim _thisLock = new ReaderWriterLockSlim(LockRecursionPolicy.NoRecursion);\r
  16         private int _isDisposed = 0;\r
  17         public void EnterReadLock()\r
  18         {\r
  19             this._thisLock.EnterReadLock();\r
  20         }\r
  21 \r
  22         public void EnterWriteLock()\r
  23         {\r
  24             this._thisLock.EnterWriteLock();\r
  25         }\r
  26 \r
  27         public void ExitReadLock()\r
  28         {\r
  29             this._thisLock.ExitReadLock();\r
  30         }\r
  31 \r
  32         public void ExitWriteLock()\r
  33         {\r
  34             this._thisLock.ExitWriteLock();\r
  35         }\r
  36 \r
  37         public void Dispose()\r
  38         {\r
  39             if (Interlocked.CompareExchange(ref this._isDisposed, 1, 0) == 0)\r
  40             {\r
  41                 this._thisLock.Dispose();\r
  42             }\r
  43         }\r
  44 \r
  45 #else\r
  46         // ReaderWriterLockSlim is not yet implemented on SilverLight\r
  47         // Satisfies our requirements until it is implemented\r
  48         object _thisLock = new object();\r
  49 \r
  50         public Lock()\r
  51         {\r
  52         }\r
  53 \r
  54         public void EnterReadLock()\r
  55         {\r
  56             Monitor.Enter(this._thisLock);\r
  57         }\r
  58 \r
  59         public void EnterWriteLock()\r
  60         {\r
  61             Monitor.Enter(this._thisLock);\r
  62         }\r
  63 \r
  64         public void ExitReadLock()\r
  65         {\r
  66             Monitor.Exit(this._thisLock);\r
  67         }\r
  68 \r
  69         public void ExitWriteLock()\r
  70         {\r
  71             Monitor.Exit(this._thisLock);\r
  72         }\r
  73 \r
  74         public void Dispose()\r
  75         {\r
  76         }\r
  77 #endif\r
  78     }\r
  79 }\r