Subject: Re: [linux-audio-dev] userspace atomic primitives for multithread and SMP applications?
From: Tim Hockin (thockin_AT_hockin.org)
Date: Mon Aug 18 2003 - 23:28:24 EEST
On Sun, Aug 17, 2003 at 12:56:09PM -0500, Jack O'Quin wrote:
>
> I am looking for a good set of portable, supported atomic.h-style
> primitives for userspace applications. I am not especially interested
> in the low-level functions defined in <asm/atomic.h>. I really want
> something more powerful like the kernel's compare_and_swap(),
> cmpxchg(), test_and_set(), atomic_inc_and_return(), or fetch_and_add()
These are intrinsically platform specific.
> (*) glibc seems to have a good set of functions internally
>
> AFAICT, these are for the library's own use, not part of the
> supported external interface. I'll investigate further.
It sure would be nice if glibc exposed an atomic API. I dunno how much you
can do as a user, though. Can non-privileged tasks run LOCKed instructions
on x86? How about other architectures?
-- Notice that as computers are becoming easier and easier to use, suddenly there's a big market for "Dummies" books. Cause and effect, or merely an ironic juxtaposition of unrelated facts?
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