Re: adjust-stream-position() crashing

[address@hidden (Nimi Peleg)]

"Scott McKay" <swm@attbi.com> wrote in message news:<3ykv9.143982$qM2.45174@sccrnsc02>...
> "Nimi Peleg" <nimi@better.tv> wrote in message
> cde956d7.0210280557.3c3ccc2d@posting.google.com">news:cde956d7.0210280557.3c3ccc2d@posting.google.com...
> > "Scott McKay" <swm@attbi.com> wrote in message
>  news:<lKTt9.84209$qM2.23196@sccrnsc02>...
> > > "Nimi Peleg" <nimi@better.tv> wrote in message
> > > cde956d7.0210240331.dddb030@posting.google.com">news:cde956d7.0210240331.dddb030@posting.google.com...
> > > > I'm having trouble with adjust-stream-position() in FunDev.
> > > > After a while of writing/reading the file, the following error occurs:
> > > >
> > > > "Invalid bounds for <buffer> ... start: 16872, end: 16384"
> > > >
> > > > I don't know anything about the internals of the streams library but
> > > > it seems like the 'end: 16384' might be a forced truncation of a
> > > > bigger size, as it happens several times with different start values.
> > > >
> > > > The file is opened for "input-output" direction.
> > > >
> > > > Has anybody else encountered this and knows the reason for this? any
> > > > workaround?
> > > >
> > >
> > > Can you supply a small failing program?
> >
> > I wrote a program to simulate the file operations of the actual code -
> > but it works fine. Since the error shows up only after crunching tons
> > of data, working fine for a while, I find it difficult placing an
> > ambush in a proper spot.
> > I'll keep debugging, but I'm not sure how to approach this. Could a
> > stack backtrace of the streams lib part give you a hint, maybe of a
> > precondition that is not met?
> 
> Yeah, get the most detailed stack trace you can.  Use the Dylan
> debugger to describe some objects, etc, too.

Well, the problem is not in adjust-stream-position() after all. Due to
an exception handler the real probelm was hidden. I still don't
understand how it landed in adjust-stream-position() though. Thanks
for the quick response Scott.