[PD] variable receive objects?

[Jonathan Wilkes]

----- Original Message -----

> From: Claude Heiland-Allen <claude at goto10.org>
> To: pd-list at iem.at
> Cc: 
> Sent: Friday, May 18, 2012 7:08 AM
> Subject: Re: [PD] variable receive objects?
> 
> On 14/05/12 19:43, Jonathan Wilkes wrote:
>>>  From: IOhannes m zmoelnig<zmoelnig at iem.at>
>>>  On 2012-05-14 05:02, John Harrison wrote:
>>>>    I've used those 2 objects a lot and thought they seemed 
> pretty
>>>>    stable...
>>> 
>>>  that's because the "trivial" case (where receiving data 
> and
>>>  changing
>>>  the receive label are completely independent of each other
>>>  (stackwise)) won't create much of a problem.
>> 
>>  How do I manifest the bug?
> 
> See attached.  Uses iem_r, though it should make no difference which 
> settable-receive you use.
> 
> WARNING: clicking the "boom" message makes Pd segfault :WARNING
> 
> To understand this you need to know that pd stores a receiver in the symbol 
> table.  When there is only one receiver, it's just a pointer to the object, 
> but when there's more than one there's a proxy object that contains a 
> list.  When you change a receiver it can end up deleting the proxy object if the 
> receiver count for a symbol drops from 2 to 1. Deleting an object while code is 
> executing in its context -> boom.

Thanks, Claude.

I just want to point out that this affects every iemgui as well.

> 
> 
> Claude
> 
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