XInitThreads and GTK problem (text entry) again

[David Topper <topper virginia edu>]

Hi Folks,

I'm running Gtk 1.2.10 under X 4.2.1.1 and am having some problems. 
Here's some background:

1.  I've got an app that draws widgets to a Gnome Canvas.  Works nicely.
2.  I've got a new "widget/object" that reads incoming video with V4L. 
I needed to put this widget inside it's own thread.  I had a hell of a 
time getting it to work until I called XInitThreads() at the very start 
of my app.  So now things seem to work fine.  

I tried using g_thread_init() and gdk_thread_enter/leave() but they just 
didn't seem to work.  I get an X error message which crashes my app.

3.  I am having a problem, however, when I draw a widget that contains a 
text entry box.  Namely, if I select the entry and try to change it, my 
app hangs.  Seems similar to previous problems I've read about.  Here's 
a backtrace.

#0  0x4035ccd1 in sigsuspend () from /lib/libc.so.6
#1  0x401a5118 in __pthread_wait_for_restart_signal ()
  from /lib/libpthread.so.0
#2  0x401a73cc in __pthread_alt_lock () from /lib/libpthread.so.0
#3  0x401a3480 in pthread_mutex_lock () from /lib/libpthread.so.0
#4  0x402503da in _XUnregisterFilter () from /usr/X11R6/lib/libX11.so.6
#5  0x402299bc in XQueryExtension () from /usr/X11R6/lib/libX11.so.6
#6  0x4022007b in XInitExtension () from /usr/X11R6/lib/libX11.so.6
#7  0x40260618 in XkbUseExtension () from /usr/X11R6/lib/libX11.so.6
#8  0x40257c25 in XRefreshKeyboardMapping () from /usr/X11R6/lib/libX11.so.6
#9  0x402574d9 in XkbLookupKeySym () from /usr/X11R6/lib/libX11.so.6
#10 0x402580e6 in XLookupString () from /usr/X11R6/lib/libX11.so.6
#11 0x404a49be in _XimLocalFilter ()
  from /usr/X11R6/lib/X11/locale/common/ximcp.so.2
#12 0x4024fc65 in XFilterEvent () from /usr/X11R6/lib/libX11.so.6
#13 0x4015a88d in gdk_wm_protocols_filter () from /usr/lib/libgdk-1.2.so.0
#14 0x4015aade in gdk_wm_protocols_filter () from /usr/lib/libgdk-1.2.so.0
#15 0x4018ae75 in g_get_current_time () from /usr/lib/libglib-1.2.so.0
#16 0x4018b32c in g_get_current_time () from /usr/lib/libglib-1.2.so.0
#17 0x4018b55c in g_main_run () from /usr/lib/libglib-1.2.so.0
#18 0x400b1083 in gtk_main () from /usr/lib/libgtk-1.2.so.0
#19 0x080664b0 in main (argc=1, argv=0xbffff764) at main.c:162

I'm at a total loss to fix this.

4.  If I open up a GtkFileSelection window first ... then there is no 
problem.  I wonder why this is the case?  I've tried popping up other 
dialog / popup windows too, but they don't have the same effect.

If any one has some help / input I'd really appreciate it.  Currently, 
this is a show stopper ...as I'm trying to design a "widget/object" for 
my app using the text widget ... to create a type of built in text 
editor.  It has the same problem.

Thanks,

DT

--
Technical Director - Virginia Center for Computer Music
http://www.virginia.edu/music/vccm.html