[PD-dev] netsend (and more) crash bug SOLVED (patch included)

[Hans-Christoph Steiner]

Hey Ico,

You should post this to the patch tracker once you are ready to submit  
it.

.hc

On Nov 18, 2009, at 11:40 PM, Ivica Ico Bukvic wrote:

> Yay! Finally figured it out.
>
> Please disregard my netsend patch, it's basically treating symptoms
> rather than the source.
>
> It turns out that the patch I submitted before to fix canvas GOP  
> toggle
> on/apply/off/apply crash has been the cause of the problem all along
> mainly because the final version had the second part nested, causing a
> lot of problems at close time.
>
> Namely, the old version is like this (prior to my patch):
>
> void canvas_destroy_editor(t_glist *x)
> {
>    t_gobj *y;
>    t_object *ob;
>    if (x->gl_editor)
>    {
>        for (y = x->gl_list; y; y = y->g_next)
>            if (ob = pd_checkobject(&y->g_pd))
>                rtext_free(glist_findrtext(x, ob));
>        editor_free(x->gl_editor, x);
>        x->gl_editor = 0;
>    }
> }
>
> The currently broken patched version (the one I proposed earlier) is:
>
> void canvas_destroy_editor(t_glist *x)
> {
>    t_gobj *y;
>    t_object *ob;
>    if (x->gl_editor)
>    glist_noselect(x);
>    if (x->gl_editor && x->gl_list)
>    {
> 	if (x->gl_list) {
>       	    for (y = x->gl_list; y; y = y->g_next)
>       	    	if (ob = pd_checkobject(&y->g_pd))
>               	    rtext_free(glist_findrtext(x, ob));
>
> 	    //notice how this part is never reached if x->gl_list
> 	    //condition is not satisfied, yet it is reached in
> 	    //previous version...
> 	    //this is the cause of
> 	    //problems I've been experiencing
> 	    if (x->gl_editor) {
> 	        editor_free(x->gl_editor, x);
> 	        x->gl_editor = 0;
> 	    }
>        }
>    }
> }
>
> Sooooo, here's the correct version which still resolves two issues
> pointed out before without introducing any known regressions. The  
> issues
> once again are:
>
> #1 crash when creating a new patch->create a sub-patch->open sub-patch
> properties->enable GOP->apply->disable GOP (without closing
> properties)->apply
> #2 crash when creating a new patch->create a sub-patch->create an  
> object
> *and leave elected->open sub-patch properties->enable
> GOP->apply->disable GOP (without closing properties)->apply
>
> CORRECT VERSION:
>
> void canvas_destroy_editor(t_glist *x)
> {
>    t_gobj *y;
>    t_object *ob;
>    glist_noselect(x); //necessary to resolve crash #2
>    if (x->gl_editor)
>    {
> 		if (x->gl_list) { //necessary to resolve crash #1
>        	for (y = x->gl_list; y; y = y->g_next)
>        	    if (ob = pd_checkobject(&y->g_pd))
>        	        rtext_free(glist_findrtext(x, ob));
> 		}
> 		//fix to make this condition independent from x->gl_list
> 		if (x->gl_editor) {
> 			editor_free(x->gl_editor, x);
> 			x->gl_editor = 0;
> 		}
> 	}
> }
>
> Cheers!
>
> ico
>



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