System.Net.NetworkInformation.TeredoHelper.OnStabilized C# (CSharp) Method

        private void OnStabilized(IntPtr context, IntPtr table)
        {
            Interop.IpHlpApi.FreeMibTable(table);

            // Lock the TeredoHelper instance to ensure that only the first call to OnStabilized will get to call 
            // RunCallback.  This is the only place that TeredoHelpers get locked, as individual instances are not
            // exposed to higher layers, so there's no chance for deadlock.
            if (!_runCallbackCalled)
            {
                lock (this)
                {
                    if (!_runCallbackCalled)
                    {
                        _runCallbackCalled = true;
                        ThreadPool.QueueUserWorkItem(RunCallback, null);
                    }
                }
            }
        }
    }