Hi all,
I learned that when using threads with pygtk, calls to gtk should be
surrounded by threads_enter/threads_leave.
This has always worked fine for me, until I recently upgraded my linux
system to redhat 7.2, now I suddenly get 'async reply' xlib errors (which
you always get if you don't use threads_enter/leave)
I've narrowed the problem down to the code below. Can anyone tell me what
I'm doing wrong?
I'm running redhat 7.2/i386 with standard (rpm) python 1.5.2. Here's a
listing of installed rpm's:
[ivo@1979 ivo]$ rpm -qa | egrep -i '(python|gtk)'
pygtk-libglade-0.6.8-3
libgtkhtml15-0.12.0-ximian.6
gtkhtml-1.0.0-ximian.1
pygtk-devel-0.6.8-3
python-1.5.2-35
rep-gtk-gnome-0.15-ximian.6
gtkhtml-devel-1.0.0-ximian.1
gtk+-1.2.10-ximian.21
gtk-engines-0.12-ximian.1
rep-gtk-0.15-ximian.6
libgtkhtml17-0.14.0-ximian.2
libgtkhtml20-1.0.0-ximian.1
python2-2.1.1-2
pygtk-0.6.8-3
python-devel-1.5.2-35
gtk+-devel-1.2.10-ximian.21
rep-gtk-libglade-0.15-ximian.6
python2-devel-2.1.1-2
The same error occurs on a bare 7.2 system without ximian installed.
Here's the example code (based on the pygtk tutorial text example):
--- 8< -- cut here ---
#!/usr/bin/env python
import time
import gtk
from threading import Thread
threadcount = 0
class example:
def __init__(self):
window = gtk.GtkWindow(gtk.WINDOW_TOPLEVEL)
window.set_usize(600, 500)
window.set_policy(gtk.TRUE, gtk.TRUE, gtk.FALSE)
window.set_border_width(0)
self.text = gtk.GtkText()
self.text.set_editable(gtk.FALSE)
window.add(self.text)
self.text.show()
self.text.realize()
window.show()
def insert(self, msg):
self.text.insert_defaults(msg)
class textThread(Thread):
def __init__(self, index, text):
Thread.__init__(self)
self.text = text
self.index = index
def run(self):
global threadcount
while(1):
gtk.threads_enter()
threadcount = threadcount + 1
print "Thread %d activated, %d active threads" % \
(self.index, threadcount)
self.text.insert("I'm thread %d\n" % self.index)
threadcount = threadcount - 1
gtk.threads_leave()
time.sleep(1)
def main():
gtk.mainloop()
return 0
if __name__ == "__main__":
t = example()
for i in range(0, 10):
tt = textThread(i, t)
tt.start()
main()
--- 8< -- cut here ---
It always gives me, after a while,
[ivo@1979 tmp]$ ./text.py
Thread 0 activated, 1 active threads
Thread 1 activated, 1 active threads
Thread 4 activated, 1 active threads
Xlib: unexpected async reply (sequence 0xe3)!
Sometimes the threads run longer, usually the hexcode differs. Also, generating
window events (focus, resizing) seems to influence this as well.
Lastly, surrounding the self.text.insert_defaults with text.freeze() / thaw()
makes the program crash later, but it will crash eventually.
What am I missing here?
Cheers,
Ivo
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