Stuck GUI with PyGTK and Threads

[sparkus]

arrgh.

I've been messing around with displaying a serial feed in PyGTK. For some reason whenever I thread the little bugger the GUI hangs.

YES, I've read the PyGTK FAQ (most of my code came from it)

Any help would be really appreciated!

import threading, thread
import gobject, gtk, time
import serial, csv, eeml

      
def getTime(): #little function that returns local time
        return time.strftime("%H:%M:%S", time.localtime())       
        
class MainWindow(gtk.Window):
   
   #displayText = 
   def __init__(self):
       self.displayText = "program start: " + getTime()
       self.serial = serial.Serial('/dev/ttyUSB0', 9600)
       self.viable = True
       #Window
       super(MainWindow, self).__init__()
       #VBOX
       vb = gtk.VBox()
       self.add(vb)       
       #Scrolling Window
       self.set_size_request(300, 400)
       sw = gtk.ScrolledWindow()
       sw.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
       sw.set_shadow_type(gtk.SHADOW_ETCHED_OUT)
       sw.set_border_width(10)
       self.textview = gtk.TextView()
       textbuffer = self.textview.get_buffer()
       textbuffer.set_text(self.displayText)
       sw.add(self.textview)
       vb.pack_start(sw)
       #Button for Scrolling Window
       swButton = gtk.Button(stock=gtk.STOCK_OK)
       vb.pack_start(swButton)
       swButton.connect('clicked', self.on_swButton_clicked)
       #show All
       self.show_all()

   def on_swButton_clicked(self, button):
       self.getSerial(button)
   def getSerialThread(self, button):
       threading.Thread(target=getSerial, args=(button,)).start()
   
   def getSerial(self, button):
       while 1: 
         readings = self.serial.readline()#.strip().split(' ') # the readings are separated by space
         
         if (readings.find('%M')!=-1):
             readings = readings.strip().split(' ')
             if (len(readings) == 10):
                self.addTextToWidget(getTime() + ": " + "CO2:" + readings[1] + " Temp:" +readings[2] + " Light:" +readings[3] + " FAN:" +readings[4] + " CO2ON:" + readings[5] + " CO2LOSS:" + readings[6] + " CO2INJ:" + readings[7] + " HighBias:" + str(int(readings[8]) -200) + " LowBias:" + readings[9])
         else: 
             self.addTextToWidget("DEBUG: " + readings.strip())
   def addTextToWidget(self, newText):
          gtk.gdk.threads_enter()
          self.textview.get_buffer().insert(self.textview.get_buffer().get_start_iter(), newText) 
          gtk.gdk.threads_leave()

if __name__ == '__main__':
    gobject.threads_init()
    gtk.gdk.threads_init()
    w = MainWindow()
    w.connect("destroy", lambda _: gtk.main_quit())
    gtk.main()

[sparkus]

def on_swButton_clicked(self, button):
       self.getSerial(button)
   def getSerialThread(self, button):
       threading.Thread(target=getSerial, args=(button,)).start()
   
   def getSerial(self, button):
       while 1: 
...

For those following along at home, it does you no good to have a getSerialThread definition, if you bypass it by calling self.getSerial from the buttonclicked function.

Thanks to those that reviewed it!