diff --git a/GMap.NET.WindowsMobile/GMap.NET.Internals/FastReaderWriterLock.cs b/GMap.NET.WindowsMobile/GMap.NET.Internals/FastReaderWriterLock.cs
new file mode 100644
--- /dev/null
+++ b/GMap.NET.WindowsMobile/GMap.NET.Internals/FastReaderWriterLock.cs
@@ -0,0 +1,35 @@
+
+namespace GMap.NET.Internals
+{
+#if PocketPC
+   internal class FastReaderWriterLock
+   {
+      object rlock = new object();
+
+      internal void AcquireReaderLock()
+      {
+          System.Threading.Monitor.Enter(rlock);
+      }
+
+      internal void ReleaseReaderLock()
+      {
+          System.Threading.Monitor.Exit(rlock);
+      }
+
+      internal void AcquireWriterLock()
+      {
+          System.Threading.Monitor.Enter(rlock);
+      }
+
+      internal void ReleaseWriterLock()
+      {
+          System.Threading.Monitor.Exit(rlock);
+      }
+ 
+      internal void Dispose()
+      {
+          rlock = null;
+      }
+   }
+#endif
+}