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https://issues.apache.org/jira/browse/STDCXX-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581592#action_12581592
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Farid Zaripov commented on STDCXX-792:
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Possibly we should declare native __rw_atomic_xxx() functions as accepting the
volatile reference, but this is an another issue for 5.0 release due to binary
incompatibility of such change.
> __rw_locale::_C_manage() uses mutex based __rw_atomic_preincrement() even if
> platform supports the native atomic operations
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: STDCXX-792
> URL: https://issues.apache.org/jira/browse/STDCXX-792
> Project: C++ Standard Library
> Issue Type: Bug
> Components: 22. Localization
> Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0
> Environment: All
> Reporter: Farid Zaripov
> Assignee: Farid Zaripov
> Fix For: 4.2.1
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> In __rw_locale::_C_manage() (src/locale_body.cpp, line 808), the static
> variable ginit declared as volatile, but __rw_atomic_preincrement()
> functions, which are implemented using atomic operations, accepting the
> non-volatile reference in parameter list. As a result the template version
> __rw_atomic_preincrement<volatile long>() (which is implemented using mutex
> object) is used.
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