Re: [PATCH] Add native windows on arm64 support

Hi,

On 2024-02-12 12:50:12 -0800, Andres Freund wrote:
> On 2024-02-12 13:28:40 -0500, Andrew Dunstan wrote:
> I wonder if this indicates that we are either missing memory barriers
> somewhere or that the memory barriers we end up with on msvc + arm aren't
> correct?  Either could explain why the problem doesn't occur when building
> with optimizations.

I think I might have been on to something - if my human emulation of a
preprocessor isn't wrong, we'd end up with

#define S_UNLOCK(lock)  \
        do { _ReadWriteBarrier(); (*(lock)) = 0; } while (0)

on msvc + arm. And that's entirely insufficient - _ReadWriteBarrier() just
limits *compiler* level reordering, not CPU level reordering.  I think it's
even insufficient on x86[-64], but it's definitely insufficient on arm.