python - Python3 gi: GtkTextBuffer core dump -

using python3 gi.repository.gtk, i'm trying display multiple text lines inside gtktextview via gtktextbuffer.

basically, i'm dynamically adding lines using _addline method, updates text buffer way (self._lines array , self._textbuffer gtktextbuffer):

def _addline(self, text):     if len(self._lines) == self._maxlines:         self._lines = self._lines[1:]     self._lines.append(text)     content = '\n'.join(self._lines)     print("tic: %d" % len(content))     self._textbuffer.set_text(content)     print("tac") 

unfortunately, @ random values of i (either lower or bigger self._maxlines), randomly core dump between "tic" , "tac", when try set content of buffer.

this method called threading, himself called constructor (after gui elements initialized):

def _startupdatethread(self):     thread = threading.thread(target=lambda: self._updateloop())     thread.daemon = true     thread.start()  def _updateloop(self):     i=0     l in listings.tail(self._logfile, follow=true, n=1000):         i+=1         print("i=%d, nlines=%d" % (i, len(self._lines)))         self._addline(l) 

i'm using glade builder structured below:

gtkwindow   - gtkvbox       - gtkscrolledwindow           - gtktextview (linked gtktextbuffer)   - gtkbutton (to close window)   - gtktextbuffer 

what did wrong? cause of core dump?

thanks lot help.

you should use glib.idle_add() when modifying widgets thread , not gtk main loop.

in case:

glib.idle_add(self._textbuffer.set_text, content)