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https://issues.apache.org/jira/browse/STDCXX-907?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Travis Vitek updated STDCXX-907:
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Patch Info: [Patch Available]
> messages<charT>::do_get() inefficiency requires unnecessary locking
> -------------------------------------------------------------------
>
> Key: STDCXX-907
> URL: https://issues.apache.org/jira/browse/STDCXX-907
> Project: C++ Standard Library
> Issue Type: Bug
> Components: 22. Localization
> Affects Versions: 4.2.1
> Reporter: Travis Vitek
> Assignee: Travis Vitek
> Priority: Minor
> Fix For: 4.3.0
>
> Attachments: stdcxx-907.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> The {{_STD::messages<T>::do_get()}} method might actually call
> {{\_\_rw_manage_cat_data()}} up to three times to access the cache. Since
> each access involves a mutex lock, there are going to be some wasted cycles.
> It would be nice to reduce this to one access. Perhaps the
> {{_RW::\_\_rw_get_message()}} function could be changed to fill in a pointer
> to the {{_STD::locale}} that is kept in the cache and the
> {{_RW::\_\_rw_get_locale()}} function could be removed.
> For backward binary compatibility we would need to keep the existing
> functions around, but we could add an overload and then deprecate the old
> ones using the {{_RWSTD_VER}} macro.
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