[PD] popen vs shell bug

[Hans-Christoph Steiner]

On Jul 1, 2010, at 3:26 PM, Kim Cascone wrote:

> Husk 00 wrote:
>>
>>
>> On Thu, Jul 1, 2010 at 8:26 PM, Kim Cascone <kim at anechoicmedia.com <mailto:kim at anechoicmedia.com 
>> >> wrote:
>>
>>    I like having the outlet on [shell] so I can pipe data to the  
>> console
>>
>> Yes, and moreover that system seems to freeze pd interface until  
>> you kill the process.
>> Does it happen to you too?
> I haven't used [system] but what you describe does happen with  
> [popen] as I indicated in my original post
> have you had similar troubles using [popen]?

That's the tricky part: ideally the process sent to popen/shell would  
finish within one Pd timeslice so that it remains deterministic and  
you know you can rely on the Pd's execution order.  I think [shell]  
spawns a thread for the process, meaning that the reply is non- 
determinstic, so if you are relying on the reply from that process,  
you have to do some extra work to handle execution order.  For  
example, just because you send a message to [shell] first, doesn't  
mean you'll get its reply first.

.hc

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