Are post-commit hooks atomic?

Hello all,

I have searched the archives and docs to no avail on this question.

I have written a script that mirrors a svn repository to another
location for backup purposes. You can think of this as "svn hotcopy"
done more efficiently.

Because I'm using incremental dump/load the basic algorithm cannot
tolerate out of order or repeated invocations on the same version.
My script handles these error conditions but does not take steps to
make sure it's central logic is atomic.

So, does subversion call my post-commit script atomically? Can I
count on there *never* being two instances of the script running
simultaneously?

Thanks,

-- 
Dewey Sasser
dewey@sasser.com
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