public void Update()
        {
            //handle any incoming commands...
            lock (s_lockObject)
            {
                foreach (int pid in m_pidsToValidate)
                {
                    //
                    if (m_processManager.FindProcessById(pid))
                    {
                        MonitoredProcess proc;
                        if (m_processes.TryGetValue(pid, out proc))
                        {
                            m_processes[pid] = new MonitoredProcess(pid);
                        }
                        else
                        {
                            m_processes.Add(pid, new MonitoredProcess(pid));
                        }
                    }
                }
                m_pidsToValidate.Clear();

                //check for missing pids

                foreach (var pair in m_processes)
                {
                    if (!m_processManager.FindProcessById(pair.Key))
                    {
                        m_pidsToValidate.Add(pair.Key);
                    }
                }

                foreach (int pid in m_pidsToValidate)
                {
                    m_processes.Remove(pid);
                }
                m_pidsToValidate.Clear();

                //check for pid timeouts
                foreach (var pair in m_processes)
                {
                    int secondsSinceLastHeartbeat = (DateTime.Now - pair.Value.m_startTime).Seconds;
                    if (secondsSinceLastHeartbeat >= 30)
                    {
                        Console.WriteLine("Restart " + pair.Key);
                        m_processManager.RestartProcessById(pair.Key);
                    }
                }
            }
        }