Re: g_ptr_array_sort crash

[Tim Müller <zen18864 zen co uk>]

On Sunday 13 February 2005 08:06, Gyözö Both wrote:

> i'm sorting a pointer array and every once in a while i get a segfault.
> i'm checking the pointers before sorting with
> g_ptr_array_sort_with_data, and they are fine. the data i pass, an
> integer (with GINT_TO_POINTER) is also all right.
>
> the crash happens in the compare function, which looks like this:
>   (snip)
>
> i print out the two pointers pl1 and pl2, and mostly they are fine, but
> sometimes one of them looks weird (0x049) and is obviously invalid, so
> i get a segfault when the function tries to access the struct members.
>
> as i said, the pointers in the array are all valid and ok before i call
> g_ptr_array_sort.
>
> i don't have a clue what the problem could be :-( hope you have ideas.

This might be happening because your compare function is inconsistent, e.g. 
when

   player_compare_func (foo, bar, x)  returns a value < 0
and
   player_compare_func (bar, foo, x)  returns 0  (instead of a value > 0)

or 
   player_compare_func (bar, bar, x)  returns a value != 0  (instead of 0)

or something similar. 

Cheers
 -Tim