1 files changed, 40 insertions, 0 deletions
diff --git a/Rx.NET/System.Reactive.Core/Reactive/Internal/SynchronizedObserver.cs b/Rx.NET/System.Reactive.Core/Reactive/Internal/SynchronizedObserver.cs
new file mode 100644
index 0000000..e41294e
--- /dev/null
+++ b/Rx.NET/System.Reactive.Core/Reactive/Internal/SynchronizedObserver.cs
@@ -0,0 +1,40 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+namespace System.Reactive
+{
+    internal class SynchronizedObserver<T> : ObserverBase<T>
+    {
+        private readonly object _gate;
+        private readonly IObserver<T> _observer;
+
+        public SynchronizedObserver(IObserver<T> observer, object gate)
+        {
+            _gate = gate;
+            _observer = observer;
+        }
+
+        protected override void OnNextCore(T value)
+        {
+            lock (_gate)
+            {
+                _observer.OnNext(value);
+            }
+        }
+
+        protected override void OnErrorCore(Exception exception)
+        {
+            lock (_gate)
+            {
+                _observer.OnError(exception);
+            }
+        }
+
+        protected override void OnCompletedCore()
+        {
+            lock (_gate)
+            {
+                _observer.OnCompleted();
+            }
+        }
+    }
+}