--- Alan Burlison <[EMAIL PROTECTED]> wrote:
> Benjamin Stuhl wrote:
>
> > Let me be more specific: if you're holding a mutex over
> a
> > call back into parrot, it's your own fault. Parrot
> itself
> > knows which functions may croak() and which won't, so
> it
> > can use utility funtions that return a status in places
> > where it'd be unsafe to croak(). (And true panics
> probably
> > should not be croak()s the way they are in perl5 -
> there's
> > not much an application can do with "Bizarre copy of
> > ARRAY")
>
> Just because parrot knows what functions can croak, it
> doesn't mean that
> it can possibly know which locks have been taken out all
> the way back up
> the stack between the call to longjmp and the
> corresponding setjmp. And,
> under your scheme we would potentially end up with two
> copies of every
> utility function - one croak_safe and one croak_unsafe.
Not very likely - the only reason I can find for most
utility functions (other than possibly string coercions) to
fail is either panic("out of memory!") or panic("data
structures hopelessly confused!") (or maybe panic("mutexes
not working!")) - anything likely to throw a programmatic
exception would be at the opcode level, and so not be open
to being called by random code.
> > > Are we talking 'expensive in C' or 'expensive in
> parrot?'
> >
> > Expensive in C (wasted memory bandwidth, code bloat ->
> > cache waste), which translates to a slower parrot.
>
> So one that dumps core faster and more frequently is what
> you seem to be
> proposing. Great.
Not at all. I have never seen a bug report of perl 5
dumping core due to a setjump() error.
> > > As far as I'm aware, trading correctness for speed is
> not
> > > an option.
> >
> > This is true, which is why I asked if there were any
> > platforms that have a nonfunctional (set|long)jump.
>
> Assume that Solaris has a non-functional setjmp if your
> program is
> threaded.
How is this an ANSI-compliant C library if setjump()
doesn't work? (No offense intended, I'm just curious.)
-- BKS
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