interthread communication

Hi,

I`ve one design question: I created one user-interface-thread for a
serial-port to write some data to the port.

Unfortunately, it seems that I have to use two user-interface threads
to get that what I want.

The first thread has a message-map, where I`ve installed a message
(ON_THREAD_MESSAGE(UWM_GET_DATA, OnGetData)). This message will be
called if some new data will be received by the ethernet connection.

void CSerialCollectDataTh::OnGetData(WPARAM wParam, LPARAM lParam)
{
  if(the first call)
  {
      //generate second ui-thread for sending data by the serial port
     m_TxSerialThread = (CSerialWrite
*)AfxBeginThread(RUNTIME_CLASS(CSerialWrite),
THREAD_PRIORITY_NORMAL, // priority 0, //
default stack size CREATE_SUSPENDED);

     if ( m_TxSerialThread == NULL) return;

     m_TxSerialThread ->ResumeThread();
     m_TxSerialThread->PostThreadMessage(UWM_START_TX_DMX,
(WPARAM)SerialHandle, (LPARAM)0);

   }
  //store the ethernet data in a clist or carray

  return;
}

The second ui-thread will be created if the first data (by ethernet)
will arrive.

void CSerialWrite::OnStart(WPARAM wParam, LPARAM lParam)
{
    //public member of this class: handle
    handle = (SerialHandle)wParam;

    //install the event notification (only dummy code)
    hEvent = CreateEvent(NULL,false,false,_T(""));
    SetEventNotification();

     TxSerialData();
}

void CSerialWrite::TxSerialData()
{
     while(running)
     {
          //get data packets from CSerialCollectDataTh

          //tx data packet (serial port)
         WriteData(buffer);

          //wait until all data will be txd
          WaitForSingleObject(hEvent,INFINITE);
     }
}

Which solutions do I have to get the data packets from the
CSerialCollectDataTh thread class to the CSerialWrite thread class?

WaitForSingleObject: the signal for the hEvent will be generated by
the device driver for this external serialport device (FTDI device).

Moreover is there a simpler solution available than the one I`m trying
to use? CSerialCollectDataTh has only the task to get all incoming
data packets by the ethernet connection collected to one clist /
cArray.
CSerialWrite will write these data packets to the serial port.

Moreover I`ve installed another thread class for the specific
Casyncsocket receiving these data packets. I`m not sure if it is much
better to collect the data packets in this thread class and getting
them by SendMessage() from the CSerialWrite() thread.

best regards
Hans