[LAD] memory leak assistance

[hermann]

Hi
gtk_widget_get_pango_context(widget) didn't need to unref, it's owned by
the widget you get it from. Unlike the context returned by
gtk_widget_create_pango_context()

 I'm use mostly  style->font_desc instead.

      PangoLayout *pl;
      PangoRectangle rect;

      GtkStyle *style = gtk_widget_get_style(widget);
     
      pango_font_description_set_family(style->font_desc, "sans");
      pango_font_description_set_size(style->font_desc, 8 *
PANGO_SCALE);
     
      gtk_widget_modify_font(widget, style->font_desc);
      pl = pango_layout_new(style->font_desc);
      pango_layout_set_text(pl, "99", -1);
      pango_layout_get_pixel_extents(pl, &rect, NULL);
 
     
      g_object_unref(pl);

regards  hermann


Am Mittwoch, den 30.12.2009, 01:18 +1100 schrieb Patrick Shirkey:
> Hi,
> 
> I have some code in gtk2 that is leaking and I can't fix it. Over the 
> past two nights I have managed to get the leak down from 200MB/minute to 
> 200MB/10 minutes but I can't get rid of it completely. It's annoying 
> because it increments in 200MB blocks so I have to wait for up to 10 
> mins to see if it is fixed or not. I have tried valgrind but it doesn't 
> really like jack and did not give me any useful output. I have traced 
> the leak through normal debugging and have verified that it does not 
> happen if I disable this offending code.
> 
> This code is run in the widgets realize event and the event is triggered 
> every 500ms.
> 
> 
>    PangoContext *pc = gtk_widget_get_pango_context(widget);
>    PangoLayout *pl;
>    PangoFontDescription *pfd;
>    PangoRectangle rect;
> 
>    pfd = pango_font_description_new();
>    pango_font_description_set_family(pfd, "sans");
>    pango_font_description_set_size(pfd, 8 * PANGO_SCALE);
>    pango_context_set_font_description(pc, pfd);
>    pl = pango_layout_new(pc);
>    pango_layout_set_text(pl, "99", -1);
>    pango_layout_get_pixel_extents(pl, &rect, NULL);
> 
>    pango_font_description_free(pfd);
>    g_object_unref(pc);
> 
> 
> If I add another
> 
>       g_object_unref(pl) ;
> 
> 
> The app code will compile but when I run it I get this segfault:
> 
> *** glibc detected *** ./src/jackeq: free(): invalid pointer: 
> 0x0000000001b87a60 ***
> 
> 
> I can have one g_object_unref for either pl or pc without segfaulting 
> but not both.
> 
> 
> I'm pretty sure this is the last leak I have to catch for the merged 
> gtkmeter.c/gtkmeterscale.c and I can't release jackeq until it is fixed. 
> Any assistance with this one is appreciated.
> 
> 
> Cheers.
>