Re: [boost] Lock-free atomic_shared_ptr<T>?

From: Tim Blechmann (tim_at_[hidden])
Date: 2008-01-18 17:03:21

On Fri, 18 Jan 2008 12:43:39 -0800, Cory Nelson wrote:

> On Jan 18, 2008 9:56 AM, Jeffrey Yasskin <jyasskin_at_[hidden]> wrote:
>> using shared_ptr<T> as a value type. The implementation I'm thinking of
>> uses hazard pointers
>> (http://erdani.org/publications/cuj-2004-12.pdf) and double-wide-cas
>> (cmpxchg16b on x86-64). So I have three questions for this list:
> 
> Athlon 64s (pre-dual core) do not have cmpxchg16b - how do you plan to
> get around that?

iirc, the x86_64 doesn't actually use a 64-bit virtual address space, but 
only 48-bit ... the remaining 16 bit could be used to store the tag ...

best, tim

-- 
tim_at_[hidden]
http://tim.klingt.org
Question: Then what is the purpose of this "experimental" music?
Answer: No purposes. Sounds.
  John Cage