Re: Adding DECLSPEC_ALIGN(4) to structs for atomic DWORD access

[David Laight]

On Mon, Jan 21, 2013 at 06:52:23PM +0100, [e-mail] wrote:
> Hi,
>
> there are some places in Wine where I believe atomic access to 32bit entities
> is expected by the programmer, yet I see little or no measures to ensure this.
>
> DWORD-Alignment is essential when several threads can access
> the same DWORD variable outside of a mutex (or within the implementation of the mutex).
>
> DECLSPEC_ALIGN(4) is the declaration that could be used to enforce
> it within a struct, assuming the struct itself is somehow aligned.

32bit items will be 32bit aligned unless the structure is 'packed'
(or similar).

David