System.Net.Sockets.NetworkStream.AwaitableSocketAsyncEventArgs.OnCompleted C# (CSharp) Method

            public void OnCompleted(Action continuation)
            {
                if (_continuation == s_completedSentinel || Interlocked.CompareExchange(ref _continuation, continuation, null) == s_completedSentinel)
                {
                    Task.Run(continuation);
                }
            }