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Re: basic_string atomicity

Maybe something like the attached patch.

        * include/ext/atomicity.h (__exchange_and_add): Use
        __atomic_fetch_add with ACQUIRE memory model.
        (__exchange_and_sub): New function.
        (__atomic_add): Use __atomic_fetch_add with ACQUIRE memory model.
        (__exchange_and_sub_single): New function.
        (__exchange_and_sub_dispatch): New function.
        * include/bits/locale_classes.h (_M_remove_reference): Use
        __exchange_and_sub_dispatch.
        * include/bits/basic_string.h (_M_dispose): Use
        __exchange_and_sub_dispatch.
        * include/bits/ios_base.h (_M_remove_reference): Use
        __exchange_and_sub_dispatch.
        * include/bits/shared_ptr_base.h (_M_release): Use
        __exchange_and_sub_dispatch.
        (_M_weak_release): Same.


- David

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