From: Volkan YAZICI
Subject: CAS (COMPARE-AND-SWAP)
Date: Sat, 06 Dec 2008 14:15:57 +0000
Message-ID: <b041aea2-adbb-4a0d-b80a-af9e7109ccbb@z1g2000yqn.googlegroups.com>

Hi,

I want to implement some concurrent (lock-free) libraries portable
across different Common Lisp implementations and benefit from CAS
(COMPARE-AND-SWAP) availability. But, at the moment SBCL is the only
CL implementation I know of that provides a COMPARE-AND-SWAP function
(SB-EXT:COMPARE-AND-SWAP). What is the situation for other CL
implementations?


Regards.

From: ···@scieneer.com
Subject: Re: CAS (COMPARE-AND-SWAP)
Date: Sat, 06 Dec 2008 15:21:35 +0000
Message-ID: <7e51b30a-ead4-4b9e-9b59-6f0b7ae226a1@q30g2000prq.googlegroups.com>

On Dec 7, 1:15 am, Volkan YAZICI <·············@gmail.com> wrote:
> Hi,
>
> I want to implement some concurrent (lock-free) libraries portable
> across different Common Lisp implementations and benefit from CAS
> (COMPARE-AND-SWAP) availability. But, at the moment SBCL is the only
> CL implementation I know of that provides a COMPARE-AND-SWAP function
> (SB-EXT:COMPARE-AND-SWAP). What is the situation for other CL
> implementations?
>
> Regards.

The Scieneer CL has good support for atomic operations built on
compare-and-swap, and supports atomic operations on symbol value
cells,
symbol property lists, cons car and cdr cells, simple-vector elements,
structure slots except raw slots, and standard-object slots. For more
information see: http://www.scieneer.com/scl/doc/synchronisation.html

Regards
Douglas Crosher