public unsafe void Run()
            {
                try
                {
                    Start();
                    CompleteStateChange(TransportThreadState.Started);
                }
                catch (Exception e)
                {
                    CompleteStateChange(TransportThreadState.Stopped, e);
                    return;
                }

                try
                {
                    int notPacked           = !EPoll.PackedEvents ? 1 : 0;
                    var buffer              = stackalloc int[EventBufferLength * (3 + notPacked)];
                    int statReadEvents      = 0;
                    int statWriteEvents     = 0;
                    int statAcceptEvents    = 0;
                    int statAccepts         = 0;
                    int statZeroCopySuccess = 0;
                    int statZeroCopyCopied  = 0;

                    var  acceptableSockets      = new List <TSocket>(1);
                    var  readableSockets        = new List <TSocket>(EventBufferLength);
                    var  writableSockets        = new List <TSocket>(EventBufferLength);
                    var  reregisterEventSockets = new List <TSocket>(EventBufferLength);
                    var  zeroCopyCompletions    = new List <TSocket>(EventBufferLength);
                    bool pipeReadable           = false;


                    bool running = true;
                    do
                    {
                        int numEvents = EPollInterop.EPollWait(_epollFd, buffer, EventBufferLength, timeout: EPoll.TimeoutInfinite).Value;

                        // actions can be scheduled without unblocking epoll
                        SetEpollNotBlocked();

                        // check events
                        // we don't handle them immediately:
                        // - this ensures we don't mismatch a closed socket with a new socket that have the same fd
                        //     ~ To have the same fd, the previous fd must be closed, which means it is removed from the epoll
                        //     ~ and won't show up in our next call to epoll.Wait.
                        //     ~ The old fd may be present in the buffer still, but lookup won't give a match, since it is removed
                        //     ~ from the dictionary before it is closed. If we were accepting already, a new socket could match.
                        // - this also improves cache/cpu locality of the lookup
                        int *ptr = buffer;
                        lock (_sockets)
                        {
                            for (int i = 0; i < numEvents; i++)
                            {
                                //   Packed             Non-Packed
                                //   ------             ------
                                // 0:Events       ==    Events
                                // 1:Int1 = Key         [Padding]
                                // 2:Int2 = Key   ==    Int1 = Key
                                // 3:~~~~~~~~~~         Int2 = Key
                                //                      ~~~~~~~~~~
                                EPollEvents events = (EPollEvents)ptr[0];
                                int         key    = ptr[2];
                                ptr += 3 + notPacked;
                                TSocket tsocket;
                                if (_sockets.TryGetValue(key, out tsocket))
                                {
                                    var type = tsocket.Type;
                                    if (type == SocketFlags.TypeClient)
                                    {
                                        lock (tsocket.Gate)
                                        {
                                            var pendingEventState = tsocket.PendingEventState;

                                            // zero copy
                                            if ((pendingEventState & EPollEvents.Error & events) != EPollEvents.None)
                                            {
                                                var copyResult = SocketInterop.CompleteZeroCopy(tsocket.Fd);
                                                if (copyResult != PosixResult.EAGAIN)
                                                {
                                                    events            &= ~EPollEvents.Error;
                                                    pendingEventState &= ~EPollEvents.Error;
                                                    zeroCopyCompletions.Add(tsocket);
                                                    if (copyResult == SocketInterop.ZeroCopyCopied)
                                                    {
                                                        tsocket.ZeroCopyThreshold = LinuxTransportOptions.NoZeroCopy;
                                                        statZeroCopyCopied++;
                                                    }
                                                    else if (copyResult == SocketInterop.ZeroCopySuccess)
                                                    {
                                                        statZeroCopySuccess++;
                                                    }
                                                    else
                                                    {
                                                        Environment.FailFast($"Error occurred while trying to complete zero copy: {copyResult}");
                                                    }
                                                }
                                            }

                                            // treat Error as Readable, Writable
                                            if ((events & EPollEvents.Error) != EPollEvents.None)
                                            {
                                                events |= EPollEvents.Readable | EPollEvents.Writable;
                                            }

                                            events &= pendingEventState & (EPollEvents.Readable | EPollEvents.Writable);
                                            // readable
                                            if ((events & EPollEvents.Readable) != EPollEvents.None)
                                            {
                                                readableSockets.Add(tsocket);
                                                pendingEventState &= ~EPollEvents.Readable;
                                            }
                                            // writable
                                            if ((events & EPollEvents.Writable) != EPollEvents.None)
                                            {
                                                writableSockets.Add(tsocket);
                                                pendingEventState &= ~EPollEvents.Writable;
                                            }

                                            // reregister
                                            tsocket.PendingEventState = pendingEventState;
                                            if ((pendingEventState & (EPollEvents.Readable | EPollEvents.Writable)) != EPollEvents.None)
                                            {
                                                tsocket.PendingEventState |= TSocket.EventControlPending;
                                                reregisterEventSockets.Add(tsocket);
                                            }
                                        }
                                    }
                                    else
                                    {
                                        statAcceptEvents++;
                                        acceptableSockets.Add(tsocket);
                                    }
                                }
                                else if (key == PipeKey)
                                {
                                    pipeReadable = true;
                                }
                            }
                        }

                        // zero copy
                        for (int i = 0; i < zeroCopyCompletions.Count; i++)
                        {
                            zeroCopyCompletions[i].OnZeroCopyCompleted();
                        }
                        zeroCopyCompletions.Clear();

                        // handle accepts
                        statAcceptEvents += acceptableSockets.Count;
                        for (int i = 0; i < acceptableSockets.Count; i++)
                        {
                            statAccepts += HandleAccept(acceptableSockets[i]);
                        }
                        acceptableSockets.Clear();

                        // handle writes
                        statWriteEvents += writableSockets.Count;
                        for (int i = 0; i < writableSockets.Count; i++)
                        {
                            writableSockets[i].OnWritable(stopped: false);
                        }
                        writableSockets.Clear();

                        // handle reads
                        statReadEvents += readableSockets.Count;
                        if (!_transportOptions.AioReceive)
                        {
                            Span <MemoryHandle> receiveMemoryHandles = MemoryHandles;
                            for (int i = 0; i < readableSockets.Count; i++)
                            {
                                TSocket socket        = readableSockets[i];
                                var     receiveResult = socket.Receive(receiveMemoryHandles);
                                socket.OnReceiveFromSocket(receiveResult);
                            }
                            readableSockets.Clear();
                        }
                        else if (readableSockets.Count > 0)
                        {
                            AioReceive(readableSockets);
                        }

                        // reregister for events
                        for (int i = 0; i < reregisterEventSockets.Count; i++)
                        {
                            var tsocket = reregisterEventSockets[i];
                            lock (tsocket.Gate)
                            {
                                var pendingEventState = tsocket.PendingEventState & ~TSocket.EventControlPending;
                                tsocket.PendingEventState = pendingEventState;
                                UpdateEPollControl(tsocket, pendingEventState, registered: true);
                            }
                        }
                        reregisterEventSockets.Clear();

                        // handle pipe
                        if (pipeReadable)
                        {
                            PosixResult result;
                            do
                            {
                                result = _pipeEnds.ReadEnd.TryReadByte();
                                if (result.Value == PipeStopSockets)
                                {
                                    StopSockets();
                                }
                                else if (result.Value == PipeStopThread)
                                {
                                    running = false;
                                }
                                else if (result.Value == PipeCloseAccept)
                                {
                                    CloseAccept();
                                }
                            } while (result);
                            pipeReadable = false;
                        }

                        // scheduled work
                        // note: this may write a byte to the pipe
                        DoScheduledWork(_transportOptions.AioSend);
                    } while (running);

                    _logger.LogDebug($"Stats A/AE:{statAccepts}/{statAcceptEvents} RE:{statReadEvents} WE:{statWriteEvents} ZCS/ZCC:{statZeroCopySuccess}/{statZeroCopyCopied}");

                    CompleteStateChange(TransportThreadState.Stopped);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                    Console.WriteLine(ex.StackTrace);
                    Environment.FailFast("TransportThread", ex);
                }
            }