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SubjectRe: [RFC] New locking primitive for 2.5 wrote:
> llseek:
> atomic_enquee request
> if no room gotta sleep
> else if trylock mutex
> return
> else
> do work
> loop:
> process any pending requests
> release lock;
> if pending_requests && !(trylock mutex) goto loop

This is how printk() works. It was a very powerful and satisfactory
solution to a nasty locking/atomicity problem. It'd be nice to have
a more generic way of expressing that solution.

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