System.Net.TimerThread.TimerQueue.Fire C# (CSharp) Method

            internal bool Fire(out int nextExpiration)
            {
                while (true)
                {
                    // Check if we got to the end.  If so, free the handle.
                    TimerNode timer = _timers.Next;
                    if (timer == _timers)
                    {
                        lock (_timers)
                        {
                            timer = _timers.Next;
                            if (timer == _timers)
                            {
                                if (_thisHandle != IntPtr.Zero)
                                {
                                    ((GCHandle)_thisHandle).Free();
                                    _thisHandle = IntPtr.Zero;
                                }

                                nextExpiration = 0;
                                return false;
                            }
                        }
                    }

                    if (!timer.Fire())
                    {
                        nextExpiration = timer.Expiration;
                        return true;
                    }
                }
            }
        }