[patch] Make std::tr1::shared_ptr thread-safe.

[Paolo Carlini]

Gabriel Dos Reis wrote:

>I don't think I agree.  I vote for only one version.  We don't need to
>send in something broken just to pretend to correct it in 4.0.1.
>  
>
Why are you using the term "broken"?!? I don't think Alexander and Peter
used the term "broken" anywhere. It's just a matter of efficiency and,
as far as I'm concerned, not checking in invasive changes so close to
the release. Do you disagree with that?!? The only alternate solution I
would consider is simply stating in the 4.0 release notes that
share_pointer is not thread-safe. In any case (also in mainline, I mean)
a solution involving CAS is not possible for platforms that we support,
like 386 and old Sparc (as mentioned by Rth).

Paolo.