Re: question: spinlocks and userspace.

Ingo Molnar (mingo@chiara.csoma.elte.hu)
Wed, 10 Nov 1999 13:44:36 +0100 (CET)

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> the problem itself is the nontrivial one. You are trying to take a
> spinlock-protected 'snapshot' of an indefinit-length kernel-space object,
> and that is a nontrivial concept. The 'easy' solution is to give up
> atomicity.

additionally: if the data structure is never accessed from IRQ handlers
then it's fast and safe to use a semaphore instead of a spinlock.

-- mingo

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