MemoryBarrier and MinGW

[LRN]

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On Oct 07, 2011; 11:57pm Earnie wrote:
> Earnie wrote:
>> Thiago Macieira wrote:
>>> On Friday, 7 de October de 2011 13:57:39 Earnie Boyd wrote:
>>>> Looking into the MSDN documentation for MemoryBarrier brings 
>>>> me to the sad conclusion that it is really part of the .NET 
>>>> services and not really part of Win32 API. However the 
>>>> Interlocked services is part of the API and should be used 
>>>> while MemoryBarrier should be conditioned.
>>>> 
>>>> http://msdn.microsoft.com/en-us/library/ms684122(v=vs.85).aspx
>>>> These are defined in Winbase.h in MinGW.
>>>> 
>>> 
>>> http://msdn.microsoft.com/en-us/library/ms684208(VS.85).aspx
>>> 
>>> It looks like it's part of the Win32 API, even though there's 
>>> no function with that name exported from any DLL. It's always 
>>> inline or a macro.
>> 
>> Thanks for the link to the documentation, we can get it added to 
>> our headers however it has a minimum requirement of Vista and I'm
>> on XP which doesn't help. So "#ifdef MemoryBarrier" may be a good
>> work around to the issue.
> 
> Actually better use "#if WINVER >= 0x0502" which is the indicator 
> for Windows Server 2003.
> 
> Earnie
As far as i can see, this hasn't been done.

Also, i think i should remind the developers that GLib uses magic
macros based on __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 feature (which is
why GLib can't be compiled with anything older than -march=i486 anymore).
MemoryBarrier() macro is not available on XP, and MinGW doesn't define
it even for newer-than-XP versions of W32. MinGW does define
KeMemoryBarrier() in ddk  as asm("mfence;"). Not sure if that is
useful or not.
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