--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Implab/PromiseAwaiter.cs	Tue Jan 30 01:37:17 2018 +0300
@@ -0,0 +1,62 @@
+using System;
+using System.Runtime.CompilerServices;
+using System.Threading;
+using Implab.Parallels;
+
+namespace Implab
+{
+    public struct PromiseAwaiter : INotifyCompletion {
+        class PromiseEvent : IResolvable {
+            IDispatcher m_dispatcher;
+            
+            Action m_handler;
+            
+            public PromiseEvent(Action handler, IDispatcher dispatcher) {
+                m_handler = handler;
+                m_dispatcher = dispatcher;
+            }
+
+            public void Resolve() {
+                m_dispatcher.Enqueue(m_handler);
+            }
+
+            public void Reject(Exception error) {
+                m_dispatcher.Enqueue(m_handler);
+            }
+        }
+
+        readonly IPromise m_promise;
+        readonly IDispatcher m_dispatcher;
+
+        public PromiseAwaiter(IPromise promise, IDispatcher dispatcher) {
+            m_promise = promise;
+            m_dispatcher = dispatcher;
+        }
+
+        public PromiseAwaiter(IPromise promise) {
+            m_promise = promise;
+            m_dispatcher = GetDispatcher();
+        }
+
+        public void OnCompleted (Action continuation) {
+            if (m_promise != null)
+                m_promise.Then(new PromiseEvent(continuation, GetDispatcher()));
+        }
+
+        public void GetResult() {
+            m_promise.Join();
+        }
+
+        static IDispatcher GetDispatcher() {
+            if(SynchronizationContext.Current == null)
+                return ThreadPoolDispatcher.Instance;
+            return new SyncContextDispatcher(SynchronizationContext.Current);
+        }
+
+        public bool IsCompleted {
+            get {
+                return m_promise.IsResolved;
+            }
+        }
+    }
+}
\ No newline at end of file