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

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