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Date: Mon, 3 Oct 2011 10:35:18 -0400
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From: Ryan Stone <rysto32@gmail.com>
To: lev@freebsd.org
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Cc: hackers@freebsd.org
Subject: Re: Atomic increment and get?
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2011/10/3 Lev Serebryakov <lev@freebsd.org>:
> Hello, Hackers.
>
> =A0Is here atomic increment and get (or add and get) operation in
> =A0kernel? I cannot find one. Here is atomic_add_32(), but it doesn't
> =A0return result. And here is no atomic_add_64() on 32 bit system :(

man atomic gives all of the atomic primitives provided in the kernel.
In this case you want atomic_fetchadd_X.