Re: Reduce libstdc++-v3 locale::locale() lock contention

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,
> Actually I was digesting your response and had just finished another patch
> (need to build and test) in this area.  The 8 threads case in my test
> results shows multi-core scalability issue and it may have to do with cache
> line ping-pong.  Here is the preliminary patch (against an old gcc tree ...
> will clean it up for gcc trunk next), see if I'm on the right path or not:
>   
Definitely you are, about the issue of principle! Now however, while
doing this work, consider the ABI in the generalized sense which we care
about: I see you are touching a .h header and that scares me: what
happens if people try to link together two objects built with old and
new locale_classes.h, and a classic locale is passed around? Please
always give this sort of issue a lot of thought when proposing patches
for the library (until we decide to officially break the ABI of course)

Paolo.