private void stopChannelButton_Click(object sender, RoutedEventArgs e)
{
if (mChannelA != null && mChannelB != null)
{
mChannelA.StopEndPoint();
mChannelB.StopEndPoint();
UpdateChannelStatusGUI(null, 0);
//elimino le due code
ConcurrentQueue <QueuePacket> qA = mChannelA.InputQueue;
ConcurrentQueue <QueuePacket> qB = mChannelA.OutputQueue;
QueuePacket obj = null;
while (!qA.IsEmpty)
{
qA.TryDequeue(out obj); if (obj != null)
{
obj.Dispose();
}
}
while (!qB.IsEmpty)
{
qB.TryDequeue(out obj); if (obj != null)
{
obj.Dispose();
}
}
mChannelA.Dispose();
mChannelB.Dispose();
mChannelA = null;
mChannelB = null;
}
}
/// <summary>
/// routine del thread di rx
/// </summary>
protected static void ChannelTask(object param)
{
EndPointTranceiver thiz = param as EndPointTranceiver;
int seq_num = 0;
bool quit_loop = false;
bool back_accept = false;
thiz.mChannelStatus = ChannelStatusEnum.Idle;
if (!thiz.mConfigured)
{
return;
}
//1. apro la socket in listening, 1 solo slot in backlog
Socket listSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
Socket clientSock = null;
IPEndPoint endp = new IPEndPoint(thiz.mListeningAddress, thiz.mListeningPort);
//1a. bind
//1b. listen
try
{
listSock.Bind(endp);
listSock.Listen(1);
thiz.mChannelStatus = ChannelStatusEnum.Listening;
if (thiz.mEventReceiver != null)
{
Application.Current.Dispatcher.Invoke(new Action(() =>
{
thiz.mEventReceiver.OnChannelReady(thiz);
}));
}
}
catch
{
if (thiz.mEventReceiver != null)
{
Application.Current.Dispatcher.Invoke(new Action(() =>
{
thiz.mEventReceiver.OnGenericError(thiz, -2);
}));
}
return;
}
//loop thread
while (true)
{
try
{
//loop ACCEPT
while (true)
{
if (listSock.Poll(10000, SelectMode.SelectRead))
{
clientSock = listSock.Accept();
break;
}
else
{
if (thiz.mTranceiverShouldQuit)
{
quit_loop = true;
break;
}
}
}
if (quit_loop)
{
thiz.mChannelStatus = ChannelStatusEnum.Idle;
listSock.Close();
if (clientSock != null)
{
clientSock.Shutdown(SocketShutdown.Both);
clientSock.Close();
}
return;
}
//configuro la socket di ricezione
//il canale è attivo
thiz.mChannelStatus = ChannelStatusEnum.Active;
//notifico la connessione al controller
if (thiz.mEventReceiver != null)
{
IPEndPoint remote_endp = clientSock.RemoteEndPoint as IPEndPoint;
Application.Current.Dispatcher.Invoke(new Action(() =>
{
thiz.mEventReceiver.OnRemoteConnection(thiz, remote_endp.Address, remote_endp.Port);
}));
}
}
catch
{
//uscita ACCEPT
listSock.Close();
listSock = null;
try
{
if (clientSock != null)
{
clientSock.Shutdown(SocketShutdown.Both);
clientSock.Close();
}
}
catch
{
}
thiz.mChannelStatus = ChannelStatusEnum.Idle;
/*if (thiz.mEventReceiver != null)
* {
* Application.Current.Dispatcher.Invoke(new Action(() =>
* {
* thiz.mEventReceiver.OnGenericError(thiz, -1);
* }));
* }*/
return;
}
//LOOP RX/TX
try
{
while (true)
{
//attesa RX per 50ms
if (clientSock.Poll(50000, SelectMode.SelectRead))
{
//ci sono dati da ricevere?
int recv_amout = clientSock.Available;
if (recv_amout > 0)
{
QueuePacket pkt = new QueuePacket();
pkt.SequenceNumber = seq_num++;
pkt.PayloadData = new byte[recv_amout];
int recv = clientSock.Receive(pkt.PayloadData);
//la coda è thread safe!
thiz.mOutputQueue.Enqueue(pkt);
}
else
{
//socket chiusa,torno in accept
back_accept = true;
break;
}
}
else
{
//niente da ricevere entro il timeout
//trasmetto finche la coda e' piena
do
{
if (thiz.mTranceiverShouldQuit)
{
quit_loop = true;
break;
}
QueuePacket tx_pkt = null;
if (thiz.mInputQueue.TryDequeue(out tx_pkt))
{
if (tx_pkt != null && tx_pkt.PayloadData != null && tx_pkt.PayloadData.Length > 0)
{
clientSock.Send(tx_pkt.PayloadData);
tx_pkt.Dispose();
tx_pkt = null;
}
}
}while (!thiz.mInputQueue.IsEmpty);
if (quit_loop)
{
break;
}
}
}
//c'è stata una disconnessione oppure una richiesta di chiusura dal controller
//controllo uscita del controller
if (quit_loop)
{
thiz.mChannelStatus = ChannelStatusEnum.Idle;
listSock.Close();
try
{
clientSock.Shutdown(SocketShutdown.Both);
clientSock.Close();
}
catch
{
//non importa niente qui
}
//se e' una disconnessione devo chiudere
return;
}
//chiusura connessione del canale
if (back_accept)
{
thiz.mChannelStatus = ChannelStatusEnum.Listening;
try
{
clientSock.Shutdown(SocketShutdown.Both);
clientSock.Close();
}
catch
{
//non importa niente qui
}
if (thiz.mEventReceiver != null)
{
Application.Current.Dispatcher.Invoke(new Action(() =>
{
thiz.mEventReceiver.OnRemoteDisconnetion(thiz);
}));
}
}
}
catch
{
//gestione errore
return;
}
}
}