Re: Subtle MM bug

Alexander Viro (viro@math.psu.edu)
Thu, 11 Jan 2001 14:03:48 -0500 (EST)


On Thu, 11 Jan 2001, Stephen C. Tweedie wrote:

> Hi,
>
> On Thu, Jan 11, 2001 at 02:12:05PM +0100, Trond Myklebust wrote:
> >
> > What's wrong with copy-on-write style semantics? IOW, anyone who
> > wants to change the credentials needs to make a private copy of the
> > existing structure first.
>
> Because COW only solves the problem if each task is only changing its
> own, local, private copy of the credentials. Posix threads demand
> that one thread changing credentials also affects all the other
> threads immediately, and making your own local private copy won't help
> you to change the other tasks' credentials safely.

And how is that different from the current situation?

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/