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

[Mathieu Bouchard]

On Tue, 11 Jul 2006, Mathieu Bouchard wrote:

> A problem with watchdog timeouts is that it's difficult and nonportable 
> for a UNIX signal-handler to influence the normal execution of the 
> thread it runs on top of. As a result, to be portable, those timeouts 
> have to be implemented in a more explicit way than we might want to, and 
> then it wouldn't catch all possible timeouts. (e.g. not while(1){})

What I mean is that there would be a number of checkpoints, e.g. every 
time a Pd message is sent (by modifying m_pd.c and/or m_obj.c), and such 
checkpoints would look at a global variable indicating timeout, which is 
settable from a UNIX/POSIX signal-handler.

Exceptions that don't involve timeouts won't have this problem, but then, 
for that case, I also had a concept of non-interrupting exception which 
would be much easier to implement in Pd and would fit more with the style 
of Pd. It only consists in redirecting pd_error() and error() calls.

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| Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
| Freelance Digital Arts Engineer, Montréal QC Canada