Adding DECLSPEC_ALIGN(4) to structs for atomic DWORD access

David Laight david at
Mon Jan 21 15:55:00 CST 2013

On Mon, Jan 21, 2013 at 06:52:23PM +0100, Joerg-Cyril.Hoehle at 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 Laight: david at

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