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SubjectRe: acquiring resources shared or exclusive
Jerry Kelley writes:
> I have a rudimentary question as I'm new to the Linux kernel. Is there a
> resource that can be acquired shared so that multiple threads can read data
> from a protected region and not block each other? It seems that the
> semaphore in the Linux kernel is only exclusively acquirable. I need to be
> able to share read access from several threads to some global structures and
> don't want them to block.
> I do want blocking whenever I have to modify the structures though. Thus I'm
> looking for a way to perform synchronization for reads (shared) and writes
> (exclusively) in the kernel. I assume it can be done it's just that I'm not
> sure how to do it yet. This is probably a very easy question.

There are read/write locks available in the kernel. Look in
include/linux/spinlock.h and include/linux/brlock.h.

Cheers, Andreas
Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?" -- Dogbert
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