Re: [Cppcms-users] Fw:sorry to ask this question but i do not know where to ask

[Lee E. <le...@el...>]

it keeps the union aligned properly by making sure its size fits the other
memeber and fits a multiplication of the alignment size

On Fri, Jul 27, 2012 at 6:58 AM, 郭春晓 <rj...@12...> wrote:

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> -------- Forwarding messages --------
> From: "郭春晓" <rj...@12...>
> Date: 2012-07-27 11:57:16
> To: art...@ya...
> Subject: sorry to ask this question but i do not know where to ask
> Hi all:
> In high performance server,we all see the code as follow.
> typedef *union*
> {
>   erts_smp_rwmtx_t rwmtx;
>   byte
> cache_line_align_[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(erts_smp_rwmtx_t))];
> }*erts_meta_main_tab_lock_t*;
>
> *erts_meta_main_tab_lock_t*    main_tab_lock[16];
>
> what can cache_line_align_  do and the benefit of it ?
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