[PD] What exactly is a "stack overflow" ?

[Miller Puckette]

... and to wade in, here's an idea I'm toying with:  every 1000 or
so bangs that until sends out, check the CPU clock.  Each time more
than a second elapses, go check the input buffer from the GUI, and
execute it (so that mouse clicks would appear within the context of
the until loop!)  This would allow you to delete the offending until,
assuming you know where it is.

Another idea:  have a GUI item that interrupts Pd, causing the stack
frame to be rudely dropped and all clocks to be unset.

aren'y they both ugly?  but maybe something like this is needed ...

M


On Thu, Dec 20, 2007 at 05:39:14PM +0000, Andy Farnell wrote:
> On Thu, 20 Dec 2007 10:43:57 -0600
> "Charles Henry" <czhenry at gmail.com> wrote:
> 
> > On Dec 19, 2007 7:58 PM, Chris McCormick <chris at mccormick.cx> wrote:
> > > On Wed, Dec 19, 2007 at 02:22:44PM +0000, Andy Farnell wrote:
> > > > On Mon, 17 Dec 2007 22:23:11 +0100 IOhannes m zmoelnig <zmoelnig at iem.at> wrote:
> > > > > but a [bang(--[until] is not meant to loop infinitely.
> > > > > it loops until a certain condition is reached.
> > > >
> > > > As it stands the behaviour of [until] is correct, but it's a very dangerous
> > > > object unlike almost every other Pd object it's the only one beginners can
> > > > really screw up with.
> > 
> > I think a useful feature that would perhaps be able to handle this
> > type of problem is a 'halt'/'continue' routine for message processing.
> >  Say, for example, it could be automatically handled during a stack
> > overflow-clear the stack and send an error message.  Or triggered by
> > the watchdog to catch bang/until problems.  Something like that would
> > give you the opportunity to save/re-load or add additional objects to
> > stop the infinite loop, when not intended.
> 
> 
> The subject of the watchdog is really interesting and I'd love to 
> hear a deeper discussion on it. But how do you propose to identify
> an infinite loop? At what point does the watchdog say "Hi I'm Clippy
> your Pd Watchdog... did you mean to create an infinite loop?"
> 
> 
> > but it would still run into those problems of finding an arbitrary
> > condition to trigger the 'halt'
> 
> Hmmmm, there's beard stroker. :)
> 
> a.
> 
> 
> > 
> > Chuck
> > 
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> 
> 
> -- 
> Use the source
> 
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