For a while now, I've noticed test_tcl locking up when trying to refleaktest
it. I was able to reproduce it quite simply:
import Tkinter
import os
if "DISPLAY" in os.environ:
del os.environ["DISPLAY"]
tcl = Tkinter.Tcl()
try:
tcl.loadtk()
except Exception, e:
print e
tcl.loadtk()
Or, more directly, using _tkinter directly:
import _tkinter
import os
if "DISPLAY" in os.environ:
del os.environ["DISPLAY"]
tk = _tkinter.create(None, "test", "Tk", 0, 1, 0)
try:
tk.loadtk()
except:
pass
tk.loadtk()
In either case, the second loadtk never finishes.
It seems that, on my platform at least, Tk_Init() doesn't like being called
twice even when the first call resulted in an error. That's Tcl and Tk
8.4.12. Tkapp_Init() (which is the Tkinter part that calls Tk_Init()) does
its best to guard against calling Tk_Init() twice when the first call was
succesful, but it doesn't remember failure cases. I don't know enough about
Tcl/Tk or Tkinter how this is best handled, but it would be mightily
convenient if it were. ;-) I've created a bugreport on it, and I hope
someone with Tkinter knowledge can step in and fix it. (It looks like SF
auto-assigned it to Martin already, hmm.)
http://sourceforge.net/tracker/index.php?func=detail&aid=1475162&group_id=5470&atid=105470
--
Thomas Wouters