Re: g_list_remove breaks GList's next pointer

[Charles Schmidt <cschmidt2 emich edu>]

gtk-list-in gnome org wrote:
> I have an application I am writing here using glib 2.2.0.
>
> In this application, I create a GList.  I then add a single item to
> the list and then remove it.  However, after removing it, the
> GList->next pointer seems to get pointed to an empty list element as
> can been seen with this gdb analysis:
>
> Breakpoint 1, freeProgram (data=0x8068658, userdata=0x0) at schedule.c:174
> 174             g_list_remove(Programs, program);

This line should read:

Programs = g_list_remove(Programs,program);

Any g_list (or g_slist) function that might modifiy the structure of the 
list (which is nearly all of them, except the foreach ones, I think), 
returns the (possibly new) start of the list.  In this case, since 
g_list_remove() does modify the structure of the list, you need to 
reassign Programs to the new head of the list (it should be NULL now, 
ie: a GList with no elements).

Hope this helps

> Or maybe I am not quite understanding GLists.
>
> b.


--
-charlie