Create AsyncManualResetEvent.cs

Author: ReferenceType

AsyncManualResetEvent.cs

@@ -0,0 +1,40 @@
+  public class AsyncManualResetEvent
+    {
+        private volatile TaskCompletionSource<bool> completionSource = new TaskCompletionSource<bool>();
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AsyncManualResetEvent"/> class with
+        /// a Boolean value indicating whether to set the initial state to signaled.
+        /// </summary>
+        /// <param name="signaled">if set to <c>true</c> [signaled].</param>
+        public AsyncManualResetEvent( bool signaled )
+        {
+            if (signaled)
+                completionSource.TrySetResult(true);
+        }
+
+        /// <summary>
+        /// Waits the asynchronous.
+        /// </summary>
+        /// <returns></returns>
+        public Task WaitAsync() { return completionSource.Task; }
+
+        /// <summary>
+        ///  Sets the state of the event to signaled, allowing one or more waiting tasks to proceed.
+        /// </summary>
+        public void Set() { completionSource.TrySetResult(true); }
+
+        /// <summary>
+        ///  Sets the state of the event to  non signaled, allowing one or more waiting tasks to await.
+        /// </summary>
+        public void Reset()
+        {
+            while (true)
+            {
+                var tcs = completionSource;
+                if (!tcs.Task.IsCompleted ||
+                    Interlocked.CompareExchange(ref completionSource, new TaskCompletionSource<bool>(), tcs) == tcs)
+                    return;
+            }
+        }
+    }