Messages in this thread | | | Date | Fri, 28 Oct 2005 21:06:56 +1000 | From | Nick Piggin <> | Subject | Re: [PATCH RFC] big reader semaphore take#2 |
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Tejun Heo wrote: > Hello guys, > > This is the second take of brsem (big reader semaphore). > > Nick, unfortunately, simple array of rwsem's does not work as lock > holders are not pinned down to cpus and may release locks on other > cpus. >
That's right. It would require down_read to return the index or a pointer to the lock that it took, and to pass that into up_read. So it wouldn't be a completely drop-in replacement for a regular semaphore if that's what you had in mind?
Nick
-- SUSE Labs, Novell Inc.
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