Amqp.ReceiverLink.AsyncWaiter.Signal C# (CSharp) Метод

            public override bool Signal(Message message)
            {
                int old = Interlocked.Exchange(ref this.state, 2);
                if (old != 2)
                {
                    if (old == 1)
                    {
                        this.timer.Dispose();
                    }

                    this.callback(this.link, message);
                    return true;
                }
                else
                {
                    return false;
                }
            }