[PD-dev] [ pure-data-Bugs-1518030 ] GOP subpatch clearing itself crashes Pd

[Miller Puckette]

I don't have any idea how to do that... maybe the "any" object will
work.  
It's of course incorrect for Gem to use A_POINTER this way -- I'd suggest
changing it so that the gemhead temporarily binds it to a symbol (#gem?)
so that 'square' etc can get a reference back to it.

cheers
Miller

On Tue, Jul 11, 2006 at 01:51:58PM -0400, Mathieu Bouchard wrote:
> On Fri, 7 Jul 2006, geiger wrote:
> 
> >I think the case should be investigated. A segmentation fault in Pd is a 
> >bug and should be avoided.
> 
> Yes, and Pd already has several mechanisms for avoiding segfaults, so 
> there is precedent. In particular, it has t_gfxstub and t_gpointer, which 
> are two kinds of weak pointers. (there is also t_gstub, which is a kind of 
> reference-counting pointer, but I'm not sure about categorizing it as a 
> "segfault prevention device").
> 
> BTW, I have this problem with t_gpointers ... I want to do this,
> 
> [gemhead]
>  |
> [t b a]
>  |  |
> [list]
>  |
> [list trim]
>  |
> [square]
> 
> Which a stub in which I'd insert a [until] so as to bang the [list] 
> repeatedly. Note that this would all happen before the control is returned 
> to [gemhead] (and I'm not destroying the gemwin either), so the gemstate 
> message would still be valid. However, [list] wants to copy A_POINTER args 
> as t_gpointer structs, whereas all A_POINTERs in GEM/GF/PDP are fake, so i 
> get "consistency errors" and I suppose crashes would be possible too. How 
> should I deal with this?
> 
> BTW someone had an alternate way of doing this using other objects, but I 
> don't recall how.
> 
> I need this because of [GEMglVertex3f] or whatever the name is.
> 
>  _ _ __ ___ _____ ________ _____________ _____________________ ...
> | Mathieu Bouchard - t?l:+1.514.383.3801 - http://artengine.ca/matju
> | Freelance Digital Arts Engineer, Montr?al QC Canada

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