From owner-freebsd-ia64  Wed Oct 10 12: 7:33 2001
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Date: Wed, 10 Oct 2001 12:07:28 -0700 (PDT)
Organization: Polstra & Co., Inc.
From: John Polstra <jdp@polstra.com>
To: John Baldwin <jhb@FreeBSD.org>
Subject: RE: rtld -- atomic ops
Cc: ia64@FreeBSD.org, Doug Rabson <dfr@nlsystems.com>
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John Baldwin wrote:
> On 10-Oct-01 John Polstra wrote:
>>> 
>> That would be great, as far as I'm concerned.  Note, the reader/writer
>> locks used by the dynamic linker require something resembling an
>> atomic compare and exchange operation.
> 
> That's exactly what atomic_cmpset() is. :)  Although it doesn't guarantee an
> exchange (i.e., it doesn't return the old value if the cmp succeeds).

That's not a problem.

John

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