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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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