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    SubjectRe: brlock_is_locked()?
    On Wed, Aug 22 2001, Brad Chapman wrote:
    > > (I checked the brlock code and didn't find any schedule()s; there's
    > > probably a reason for that).
    > >
    > > Ummm, this is SMP 101, you can't sleep with a lock held.
    > > The global kernel lock is special in this regard, but all
    > > other SMP locking primitives may not sleep.
    > Grrr....I read Rusty's Unreliable Guide to Kernel Locking (twice) and
    > still didn't remember that. Guess you have to schedule() yourself.

    Errr, like Dave said, _you cannot sleep while holding a lock_. It's not
    just that the locking primitives themselves don't sleep, you must not
    call schedule() (or any other function that may block/sleep) while
    holding a lock. _That's_ SMP 101 :-)

    Jens Axboe

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