Revert "[System.IO] Integrate FileSystemWatchers from CoreFX The FSEvent CoreFX watcher becomes the new default for MacOS."

This reverts commit f5b10f34a98bdbbdc0cb086a9240d5a7795ab7c0.

10 files changed, 158 insertions, 304 deletions

diff --git a/mcs/class/System/System.IO/CoreFXFileSystemWatcherProxy.cs b/mcs/class/System/System.IO/CoreFXFileSystemWatcherProxy.cs
deleted file mode 100644
index 466acd1fff0..00000000000
--- a/mcs/class/System/System.IO/CoreFXFileSystemWatcherProxy.cs
+++ /dev/null
@@ -1,183 +0,0 @@
-// Bridges the Mono and CoreFX FileSystemWatcher types.
-
-using System.Collections.Generic;
-using System.Collections.Concurrent;
-using System.Threading;
-using System.Threading.Tasks;
-using System.Runtime.CompilerServices;
-
-using C = System.IO.CoreFX.FileSystemWatcher;
-using M = System.IO.FileSystemWatcher;
-using Handle = System.Object;
-
-namespace System.IO {
-
-	internal class CoreFXFileSystemWatcherProxy : IFileWatcher
-	{
-		static IFileWatcher instance; // Mono FSW objects -> this
-		static IDictionary<Handle, C> internal_map;  // this -> CoreFX FSW objects
-		static ConditionalWeakTable<Handle, M> external_map; // this -> Mono FSW objects
-		static IDictionary<object, Handle> event_map; // CoreFX FSW events -> this
-
-		const int INTERRUPT_MS = 300;
-
-		protected void Operation (Action<IDictionary<object, C>, ConditionalWeakTable<object, M>, IDictionary<object, object>, Handle> map_op = null, Action<C, M> object_op = null, object handle = null, Action<C, M> cancel_op = null)
-		{
-			C internal_fsw = null;
-			M fsw = null;
-			bool live, havelock;
-
-			if (cancel_op != null) { // highest priority and must not lock
-				havelock = Monitor.TryEnter (instance, INTERRUPT_MS);
-				live = (handle != null && (internal_map.TryGetValue (handle, out internal_fsw) || external_map.TryGetValue (handle, out fsw))) ;
-				if (live && havelock)
-					try { cancel_op (internal_fsw, fsw); }
-					catch (Exception) { };
-
-				if (havelock)
-					Monitor.Exit (instance);
-				if (live && !havelock)
-					try {
-						var t = Task<bool>.Run( () => { cancel_op (internal_fsw, fsw); return true;});
-						t.Wait (INTERRUPT_MS);
-					}
-					catch (Exception) { };
-				return;
-			}
-			if (map_op != null && handle == null) {
-				lock (instance) {
-					try { map_op (internal_map, external_map, event_map, null); }
-					catch (Exception e) { throw new InvalidOperationException (nameof(map_op), e); }
-				}
-				return;
-			}
-
-			if (handle == null)
-				return;
-
-			lock (instance) {
-				live = (internal_map.TryGetValue (handle, out internal_fsw) && external_map.TryGetValue (handle, out fsw)) ;
-				if (live && map_op != null) {
-					try { map_op (internal_map, external_map, event_map, handle); }
-					catch (Exception e) { throw new InvalidOperationException (nameof(map_op), e); };
-				}
-			}
-			if (!live || object_op == null)
-				return;
-
-			try { object_op (internal_fsw, fsw); }
-			catch (Exception e) { throw new InvalidOperationException (nameof(object_op), e); };
-		}
-
-		protected void ProxyDispatch (object sender, FileAction action, FileSystemEventArgs args)
-		{
-			RenamedEventArgs renamed =
-				action == FileAction.RenamedNewName ? (RenamedEventArgs) args : null;
-
-			object handle = null;
-
-			Operation (map_op: (in_map, out_map, event_map, h) => event_map.TryGetValue (sender, out handle));
-
-			Operation (object_op: (_, fsw) => {
-						if (!fsw.EnableRaisingEvents)
-							return;
-						fsw.DispatchEvents (action, args.Name, ref renamed);
-						if (fsw.Waiting) {
-							fsw.Waiting = false;
-							System.Threading.Monitor.PulseAll (fsw);
-						}
-					}, handle: handle);
-		}
-
-		protected void ProxyDispatchError (object sender, ErrorEventArgs args)
-		{
-			object handle = null;
-
-			Operation (map_op: (in_map, out_map, event_map, _) => event_map.TryGetValue (sender, out handle));
-
-			Operation (object_op: (_, fsw) => fsw.DispatchErrorEvents (args),
-				handle: handle);
-		}
-
-		public object NewWatcher (M fsw)
-		{
-			var handle = new object ();
-			var result = new C ();
-
-			result.Changed += (object o, FileSystemEventArgs args) =>
-								{ ProxyDispatch (o, FileAction.Modified, args); };
-			result.Created += (object o, FileSystemEventArgs args) =>
-								{ ProxyDispatch (o, FileAction.Added, args); };
-			result.Deleted += (object o, FileSystemEventArgs args) =>
-								{ ProxyDispatch (o, FileAction.Removed, args); };
-			result.Renamed += (object o, RenamedEventArgs args) =>
-								{ ProxyDispatch (o, FileAction.RenamedNewName, args); };
-
-			result.Error += (object o, ErrorEventArgs args) =>
-								{ ProxyDispatchError (handle, args); };
-
-			Operation (map_op: (in_map, out_map, event_map, _) => {
-				in_map.Add (handle, result);
-				out_map.Add (handle, fsw);
-				event_map.Add (result, handle);
-			});
-
-			return handle;
-		}
-
-		public void StartDispatching (object handle)
-		{
-			Operation (object_op: (internal_fsw, fsw) => {
-					internal_fsw.Path = fsw.Path;
-					internal_fsw.Filter = fsw.Filter;
-					internal_fsw.IncludeSubdirectories = fsw.IncludeSubdirectories;
-					internal_fsw.InternalBufferSize = fsw.InternalBufferSize;
-					internal_fsw.NotifyFilter = fsw.NotifyFilter;
-					internal_fsw.Site = fsw.Site;
-					internal_fsw.EnableRaisingEvents = true;
-				}, handle: handle);
-		}
-
-		public void StopDispatching (object handle)
-		{
-			Operation (handle: handle,
-				cancel_op: (internal_fsw, fsw) =>
-				{
-					if (internal_fsw != null)
-						internal_fsw.EnableRaisingEvents = false;
-
-				});
-		}
-
-		public void Dispose (object handle)
-		{
-			if (handle == null)
-				return;
-
-			Operation (handle: handle,
-				cancel_op: (internal_fsw, fsw) => {
-						if (internal_fsw != null)
-							internal_fsw.Dispose ();
-						var inner_key = internal_map [handle];
-						internal_map.Remove (handle);
-						external_map.Remove (handle);
-						event_map.Remove (inner_key);
-						handle = null;
-					});
-		}
-
-		public static bool GetInstance (out IFileWatcher watcher)
-		{
-			if (instance != null) {
-				watcher = instance;
-				return true;
-			}
-
-			internal_map = new ConcurrentDictionary <object, C> ();
-			external_map = new ConditionalWeakTable <object, M> ();
-			event_map = new ConcurrentDictionary <object, object> ();
-			instance = watcher = new CoreFXFileSystemWatcherProxy ();
-			return true;
-		}
-	}
-}
diff --git a/mcs/class/System/System.IO/DefaultWatcher.cs b/mcs/class/System/System.IO/DefaultWatcher.cs
index 28186f8451b..cbda2b294aa 100644
--- a/mcs/class/System/System.IO/DefaultWatcher.cs
+++ b/mcs/class/System/System.IO/DefaultWatcher.cs
@@ -79,9 +79,8 @@ namespace System.IO {
 			return true;
 		}
 		
-		public void StartDispatching (object handle)
+		public void StartDispatching (FileSystemWatcher fsw)
 		{
-			var fsw = handle as FileSystemWatcher;
 			DefaultWatcherData data;
 			lock (this) {
 				if (watches == null)
@@ -117,9 +116,8 @@ namespace System.IO {
 			}
 		}
 
-		public void StopDispatching (object handle)
+		public void StopDispatching (FileSystemWatcher fsw)
 		{
-			var fsw = handle as FileSystemWatcher;
 			DefaultWatcherData data;
 			lock (this) {
 				if (watches == null) return;
@@ -134,11 +132,6 @@ namespace System.IO {
 			}
 		}
 
-		public void Dispose (object handle)
-		{
-			// does nothing
-		}
-
 
 		void Monitor ()
 		{
diff --git a/mcs/class/System/System.IO/FAMWatcher.cs b/mcs/class/System/System.IO/FAMWatcher.cs
index d0ee6526ee5..63faf5fed7c 100644
--- a/mcs/class/System/System.IO/FAMWatcher.cs
+++ b/mcs/class/System/System.IO/FAMWatcher.cs
@@ -110,9 +110,8 @@ namespace System.IO {
 			return true;
 		}
 		
-		public void StartDispatching (object handle)
+		public void StartDispatching (FileSystemWatcher fsw)
 		{
-			var fsw = handle as FileSystemWatcher;
 			FAMData data;
 			lock (this) {
 				if (thread == null) {
@@ -200,9 +199,8 @@ namespace System.IO {
 			}
 		}
 
-		public void StopDispatching (object handle)
+		public void StopDispatching (FileSystemWatcher fsw)
 		{
-			var fsw = handle as FileSystemWatcher;
 			FAMData data;
 			lock (this) {
 				data = (FAMData) watches [fsw];
@@ -410,10 +408,6 @@ namespace System.IO {
 			return fam_Pending (ref fc);
 		}
 
-		public void Dispose (object handle)
-		{
-			// does nothing
-		}
 
 		
 		[DllImport ("libfam.so.0", EntryPoint="FAMOpen")]
diff --git a/mcs/class/System/System.IO/FileSystemWatcher.cs b/mcs/class/System/System.IO/FileSystemWatcher.cs
index c27900524d3..53e31d61f7e 100644
--- a/mcs/class/System/System.IO/FileSystemWatcher.cs
+++ b/mcs/class/System/System.IO/FileSystemWatcher.cs
@@ -45,8 +45,6 @@ namespace System.IO {
 
 		#region Fields
 
-		bool inited;
-		bool start_requested;
 		bool enableRaisingEvents;
 		string filter;
 		bool includeSubdirectories;
@@ -61,7 +59,6 @@ namespace System.IO {
 		bool disposed;
 		string mangledFilter;
 		static IFileWatcher watcher;
-		object watcher_handle;
 		static object lockobj = new object ();
 
 		#endregion // Fields
@@ -98,8 +95,6 @@ namespace System.IO {
 			if (!Directory.Exists (path))
 				throw new ArgumentException ("Directory does not exist", "path");
 
-			this.inited = false;
-			this.start_requested = false;
 			this.enableRaisingEvents = false;
 			this.filter = filter;
 			this.includeSubdirectories = false;
@@ -126,39 +121,28 @@ namespace System.IO {
 				switch (mode) {
 				case 1: // windows
 					ok = DefaultWatcher.GetInstance (out watcher);
-					watcher_handle = this;
+					//ok = WindowsWatcher.GetInstance (out watcher);
 					break;
 				case 2: // libfam
 					ok = FAMWatcher.GetInstance (out watcher, false);
-					watcher_handle = this;
 					break;
 				case 3: // kevent
 					ok = KeventWatcher.GetInstance (out watcher);
-					watcher_handle = this;
 					break;
 				case 4: // libgamin
 					ok = FAMWatcher.GetInstance (out watcher, true);
-					watcher_handle = this;
 					break;
 				case 5: // inotify
 					ok = InotifyWatcher.GetInstance (out watcher, true);
-					watcher_handle = this;
-					break;
-				case 6: // CoreFX
-					ok = CoreFXFileSystemWatcherProxy.GetInstance (out watcher);
-					watcher_handle = (watcher as CoreFXFileSystemWatcherProxy).NewWatcher (this);
 					break;
 				}
 
 				if (mode == 0 || !ok) {
 					if (String.Compare (managed, "disabled", true) == 0)
 						NullFileWatcher.GetInstance (out watcher);
-					else {
+					else
 						DefaultWatcher.GetInstance (out watcher);
-						watcher_handle = this;
-					}
 				}
-				this.inited = true;
 
 				ShowWatcherInfo ();
 			}
@@ -189,6 +173,9 @@ namespace System.IO {
 					return mangledFilter;
 
 				string filterLocal = "*.*";
+				if (!(watcher.GetType () == typeof (WindowsWatcher)))
+					filterLocal = "*";
+
 				return filterLocal;
 			}
 		}
@@ -223,12 +210,6 @@ namespace System.IO {
 		public bool EnableRaisingEvents {
 			get { return enableRaisingEvents; }
 			set {
-				if (disposed)
-					throw new ObjectDisposedException (GetType().Name);
-
-				start_requested = true;
-				if (!inited)
-					return;
 				if (value == enableRaisingEvents)
 					return; // Do nothing
 
@@ -237,7 +218,6 @@ namespace System.IO {
 					Start ();
 				} else {
 					Stop ();
-					start_requested = false;
 				}
 			}
 		}
@@ -252,7 +232,7 @@ namespace System.IO {
 				if (value == null || value == "")
 					value = "*.*";
 
-				if (!string.Equals(filter, value, PathInternal.StringComparison)) {
+				if (filter != value) {
 					filter = value;
 					pattern = null;
 					mangledFilter = null;
@@ -284,8 +264,8 @@ namespace System.IO {
 				if (internalBufferSize == value)
 					return;
 
-				if (value < 4096)
-					value = 4096;
+				if (value < 4196)
+					value = 4196;
 
 				internalBufferSize = value;
 				if (enableRaisingEvents) {
@@ -319,11 +299,7 @@ namespace System.IO {
 		public string Path {
 			get { return path; }
 			set {
-				if (disposed)
-					throw new ObjectDisposedException (GetType().Name);
-
-				value = (value == null) ? string.Empty : value;
-				if (string.Equals(path, value, PathInternal.StringComparison))
+				if (path == value)
 					return;
 
 				bool exists = false;
@@ -336,10 +312,10 @@ namespace System.IO {
 				}
 
 				if (exc != null)
-					throw new ArgumentException(SR.Format(SR.InvalidDirName, value), nameof(Path));
+					throw new ArgumentException ("Invalid directory name", "value", exc);
 
 				if (!exists)
-					throw new ArgumentException(SR.Format(SR.InvalidDirName_NotExists, value), nameof(Path));
+					throw new ArgumentException ("Directory does not exist", "value");
 
 				path = value;
 				fullpath = null;
@@ -353,12 +329,7 @@ namespace System.IO {
 		[Browsable(false)]
 		public override ISite Site {
 			get { return base.Site; }
-			set
-			{
-				base.Site = value;
-				if (Site != null && Site.DesignMode)
-					this.EnableRaisingEvents = true;
-			}
+			set { base.Site = value; }
 		}
 
 		[DefaultValue(null)]
@@ -376,41 +347,27 @@ namespace System.IO {
 		public void BeginInit ()
 		{
 			// Not necessary in Mono
-			// but if called, EndInit() must be called
-			inited = false;
 		}
 
 		protected override void Dispose (bool disposing)
 		{
-			if (disposed)
-				return;
-
-			try {
-				watcher.StopDispatching (watcher_handle);
-				watcher.Dispose (watcher_handle);
-			} catch (Exception) { }
-
-			watcher_handle = null;
-			watcher = null;
+			if (!disposed) {
+				disposed = true;
+				Stop ();
+			}
 
-			disposed = true;
 			base.Dispose (disposing);
-			GC.SuppressFinalize (this);
 		}
 
 		~FileSystemWatcher ()
 		{
-			if (disposed)
-				return;
-
-			Dispose (false);
+			disposed = true;
+			Stop ();
 		}
 		
 		public void EndInit ()
 		{
-			inited = true;
-			if (start_requested)
-				this.EnableRaisingEvents = true;
+			// Not necessary in Mono
 		}
 
 		enum EventType {
@@ -427,13 +384,13 @@ namespace System.IO {
 				foreach (var target in ev.GetInvocationList()) {
 					switch (evtype) {
 					case EventType.RenameEvent:
-						((RenamedEventHandler)target).Invoke (this, (RenamedEventArgs)arg);
+						((RenamedEventHandler)target).BeginInvoke (this, (RenamedEventArgs)arg, null, null);
 						break;
 					case EventType.ErrorEvent:
-						((ErrorEventHandler)target).Invoke (this, (ErrorEventArgs)arg);
+						((ErrorEventHandler)target).BeginInvoke (this, (ErrorEventArgs)arg, null, null);
 						break;
 					case EventType.FileSystemEvent:
-						((FileSystemEventHandler)target).Invoke (this, (FileSystemEventArgs)arg);
+						((FileSystemEventHandler)target).BeginInvoke (this, (FileSystemEventArgs)arg, null, null);
 						break;
 					}
 				}
@@ -546,20 +503,12 @@ namespace System.IO {
 
 		void Start ()
 		{
-			if (disposed)
-				return;
-			if (watcher_handle == null)
-				return;
-			watcher.StartDispatching (watcher_handle);
+			watcher.StartDispatching (this);
 		}
 
 		void Stop ()
 		{
-			if (disposed)
-				return;
-			if (watcher_handle == null)
-				return;
-			watcher.StopDispatching (watcher_handle);
+			watcher.StopDispatching (this);
 		}
 		#endregion // Methods
 
@@ -588,7 +537,6 @@ namespace System.IO {
 		/* 3 -> Kevent		*/
 		/* 4 -> gamin		*/
 		/* 5 -> inotify		*/
-		/* 6 -> CoreFX		*/
 		[MethodImplAttribute(MethodImplOptions.InternalCall)]
 		static extern int InternalSupportsFSW ();
 	}
diff --git a/mcs/class/System/System.IO/IFileWatcher.cs b/mcs/class/System/System.IO/IFileWatcher.cs
index d7e6055a1d5..7ed4878fa6d 100644
--- a/mcs/class/System/System.IO/IFileWatcher.cs
+++ b/mcs/class/System/System.IO/IFileWatcher.cs
@@ -30,9 +30,8 @@
 
 namespace System.IO {
 	interface IFileWatcher {
-		void StartDispatching (object fsw);
-		void StopDispatching (object fsw);
-		void Dispose (object fsw);
+		void StartDispatching (FileSystemWatcher fsw);
+		void StopDispatching (FileSystemWatcher fsw);
 	}
 }
 
diff --git a/mcs/class/System/System.IO/InotifyWatcher.cs b/mcs/class/System/System.IO/InotifyWatcher.cs
index 8668533ff83..fe023429a0c 100644
--- a/mcs/class/System/System.IO/InotifyWatcher.cs
+++ b/mcs/class/System/System.IO/InotifyWatcher.cs
@@ -133,9 +133,8 @@ namespace System.IO {
 			return true;
 		}
 		
-		public void StartDispatching (object handle)
+		public void StartDispatching (FileSystemWatcher fsw)
 		{
-			var fsw = handle as FileSystemWatcher;
 			ParentInotifyData parent;
 			lock (this) {
 				if ((long) FD == -1)
@@ -329,9 +328,8 @@ namespace System.IO {
 			}
 		}
 
-		public void StopDispatching (object handle)
+		public void StopDispatching (FileSystemWatcher fsw)
 		{
-			var fsw = handle as FileSystemWatcher;
 			ParentInotifyData parent;
 			lock (this) {
 				parent = (ParentInotifyData) watches [fsw];
@@ -610,11 +608,6 @@ namespace System.IO {
 			return AddWatch (fd, directory, mask);
 		}
 
-		public void Dispose (object handle)
-		{
-			// does nothing
-		}
-
 		[DllImport ("libc", EntryPoint="close")]
 		internal extern static int Close (IntPtr fd);
 
diff --git a/mcs/class/System/System.IO/KeventWatcher.cs b/mcs/class/System/System.IO/KeventWatcher.cs
index 5a1984f7099..778671764ea 100644
--- a/mcs/class/System/System.IO/KeventWatcher.cs
+++ b/mcs/class/System/System.IO/KeventWatcher.cs
@@ -736,9 +736,8 @@ namespace System.IO {
 			return true;
 		}
 
-		public void StartDispatching (object handle)
+		public void StartDispatching (FileSystemWatcher fsw)
 		{
-			var fsw = handle as FileSystemWatcher;
 			KqueueMonitor monitor;
 
 			if (watches.ContainsKey (fsw)) {
@@ -751,20 +750,14 @@ namespace System.IO {
 			monitor.Start ();
 		}
 
-		public void StopDispatching (object handle)
+		public void StopDispatching (FileSystemWatcher fsw)
 		{
-			var fsw = handle as FileSystemWatcher;
 			KqueueMonitor monitor = (KqueueMonitor)watches [fsw];
 			if (monitor == null)
 				return;
 
 			monitor.Stop ();
 		}
-
-		public void Dispose (object handle)
-		{
-			// does nothing
-		}
 			
 		[DllImport ("libc")]
 		extern static int close (int fd);
diff --git a/mcs/class/System/System.IO/NullFileWatcher.cs b/mcs/class/System/System.IO/NullFileWatcher.cs
index ea1cbccfaee..33f314f55b8 100644
--- a/mcs/class/System/System.IO/NullFileWatcher.cs
+++ b/mcs/class/System/System.IO/NullFileWatcher.cs
@@ -35,17 +35,12 @@ namespace System.IO
 	{
 		static IFileWatcher instance;
 		
-		public void StartDispatching (object handle)
+		public void StartDispatching (FileSystemWatcher fsw)
 		{
 			// does nothing
 		}
 
-		public void StopDispatching (object handle)
-		{
-			// does nothing
-		}
-
-		public void Dispose (object handle)
+		public void StopDispatching (FileSystemWatcher fsw)
 		{
 			// does nothing
 		}
diff --git a/mcs/class/System/System.IO/WaitForChangedResult.cs b/mcs/class/System/System.IO/WaitForChangedResult.cs
new file mode 100644
index 00000000000..7a6765b1e07
--- /dev/null
+++ b/mcs/class/System/System.IO/WaitForChangedResult.cs
@@ -0,0 +1,69 @@
+// 

+// System.IO.WaitForChangedResult.cs

+//

+// Author:

+//   Tim Coleman (tim@timcoleman.com)

+//

+// Copyright (C) Tim Coleman, 2002

+//

+
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+

+using System;

+

+namespace System.IO {

+	public struct WaitForChangedResult {

+

+		#region Fields

+

+		WatcherChangeTypes changeType;

+		string name;

+		string oldName;

+		bool timedOut;

+

+		#endregion // Fields

+		

+		#region Properties

+

+		public WatcherChangeTypes ChangeType {

+			get { return changeType; }

+			set { changeType = value; }

+		}

+

+		public string Name {

+			get { return name; }

+			set { name = value; }

+		}

+

+		public string OldName {

+			get { return oldName; }

+			set { oldName = value; }

+		}

+

+		public bool TimedOut {

+			get { return timedOut; }

+			set { timedOut = value; }

+		}

+

+		#endregion // Properties

+	}

+}

diff --git a/mcs/class/System/System.IO/WindowsWatcher.cs b/mcs/class/System/System.IO/WindowsWatcher.cs
new file mode 100644
index 00000000000..dc5e848f13d
--- /dev/null
+++ b/mcs/class/System/System.IO/WindowsWatcher.cs
@@ -0,0 +1,53 @@
+// 
+// System.IO.WindowsWatcher.cs: windows IFileWatcher
+//
+// Authors:
+//	Gonzalo Paniagua Javier (gonzalo@ximian.com)
+//
+// (c) 2004 Novell, Inc. (http://www.novell.com)
+//
+
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+namespace System.IO {
+	class WindowsWatcher : IFileWatcher
+	{
+		private WindowsWatcher ()
+		{
+		}
+		
+		// Locked by caller
+		public static bool GetInstance (out IFileWatcher watcher)
+		{
+			throw new NotSupportedException ();
+		}
+		
+		public void StartDispatching (FileSystemWatcher fsw)
+		{
+		}
+
+		public void StopDispatching (FileSystemWatcher fsw)
+		{
+		}
+	}
+}
+