messages<charT>::do_get() inefficiency requires unnecessary locking
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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
Priority: Minor
Fix For: 4.3
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.
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