how to tell if a widget is still "alive" ?

[Gregory Hosler <ghosler redhat com>]

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Hi all,

I have an application where I'm making use of animated gifs on a GtkTextBuffer.
I set a timer (g_timeout_add()) to remove the animated character after a small
period of time (10 secs in this case).

The argument to the timer callback includes a pointer to the text buffer
GtkTextChildAnchor in front of where I inserted my animation. The idea is that
inside the timeout, I insert a static copy of the gif, and do a
gtk_text_buffer_delete() of the iter's before and after the animation.

This works about 99.999% of the time.

In some rare circumstances, by the time that the timer callback is called, the
GtkTextChildAnchor has been deleted.

To guard against this, I tested the GtkTextChildAnchor with
GTK_IS_TEXT_CHILD_ANCHOR(), but on occassion, I will get a segfault on the
GTK_IS_TEXT_CHILD_ANCHOR() (the address of the GtkTextChildAnchor is still a
valid address).

I'm thinking that the GtkTextChildAnchor has been deleted, the memory used for
something else, and the GTK_IS_TEXT_CHILD_ANCHOR() is seg faulting as a result.

Question: how might I avoid this seg fault situation ? Will "GTK_IS_WIDGET()"
help to determine if the GtkTextChildAnchor is still alive before testing it
with GTK_IS_TEXT_CHILD_ANCHOR() ? or is there a better way of doing this ?

All the best,

- -Greg

- -- 
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Please also check the log file at "/dev/null" for additional information.
                (from /var/log/Xorg.setup.log)

| Greg Hosler                                   ghosler redhat com    |
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