Re: [Valgrind-users] shared memory?

[Nicholas N. <nj...@ca...>]

On 19 Jun 2003, Jeremy Fitzhardinge wrote:

> > I'm trying valgrind on an app I wrote a while ago
> > but that has since had shared memory stuff added to it.
> > Valgrind is complaining about invalid addresses when
> > the app copies stuff to the shared area.  Is this a known
> > problem, or are valgrinded apps able to share memory
> > properly with nonvalgrinded apps?  That's gotta be a toughie
> > to implement...
>
> I think its an oversight more than anything: V simply doesn't add the
> shared memory segment to the list of valid addresses, like it does with
> mmap.  You're right that doing validity checking would be hard, but
> simply treating shared memory as always valid would be OK.

A workaround that might work would be to use one or more of the macros
VALGRIND_MAKE_NOACCESS, VALGRIND_MAKE_READABLE, VALGRIND_MAKE_WRITABLE
when you allocate/deallocate the shared memory.

N