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SubjectRe: Subtle MM bug


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?

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