Re: GtkTextTag ref_count problem

[Jeff Franks <jcf tpg com au>]

Jeff Franks wrote:
>  Hi,
>
> If Havoc reads this; I'm still finding problems with some GTK+ 
> references not being unreferenced. This time its GtkTextTag.
>
> Brief background for others:
>
> I have written some C++ classes that wrap GTK+-2.0 objects. These C++ 
> wrappers don't increase or decrease a GTK+ object's reference count; 
> that's left up to the user. However, a dynamic C++ wrapper's destruction 
> does depends on the wrapped GTK+ object being unreferenced, so that when 
> the reference count reaches zero a destroy-notifier function is called 
> which deletes the C++ wrapper. I put some code in place to track 
> operator new and operator delete calls to help identify possible memory 
> leaks. It just prints out at the name of all undeleted objects.
>
> GtkTextTag problem:
>
> I have noticed that GtkTextTag's C++ wrapper never gets deleted and have 
> tried to trace the problem. When a GtkTextBuffer is finalized it 
> unreferences its GtkTextTagTable. When the GtkTextTagTable is finalized 
> it calls the following line of code:
>
> gtk_text_tag_table_foreach (table, foreach_unref, NULL);
>
> which unreferences each tag in the table. At the start of this function 
> a tag has a reference count of 2 and after being unreferenced it still 
> has a reference count of 1. When you apply a tag the 
> 'gtk_text_buffer_real_apply_tag()' function gets called. This calls 
> '_gtk_text_btree_tag()" which inturn calls 
> 'gtk_text_btree_get_tag_info()' which increases the reference count of a 
> tag. Searching through the source code I couldn't find any where that 
> the tag gets unreferenced again, except for 'foreach_unref()' in 
> GtkTextTagTable. When I removed the line that increases the reference 
> count I found that GtkTextBuffer, GtkTextTagTable and GtkTextTag still 
> worked properly and the C++ wrappers were deleted.
>
> Is this a bug or am I making a mistake somewhere?
>
> Jeff.
>
>
>
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> .

Sorry! This message was sent by mistake. Please ignore it.

Jeff.