Subj : Re: Memory visibility and MS Interlocked instructions
To   : comp.programming.threads
From : David Schwartz
Date : Thu Aug 25 2005 11:35 am


"Scott Meyers" <usenet@aristeia.com> wrote in message 
news:11grv57io8qgt3b@corp.supernews.com...

> David Schwartz wrote:

> >     The MS Interlocked instructions can only work on platforms where the
> > compiler puts in any  necessary memory barriers on all accesses to
> > 'volatile' variables. This happens to be very easy to do on x86.

> But this would require that MS insert membars on all volatile accesses,
> because there is, in general, no way to know whether another part of the
> program uses an interlocked instruction.  Do MS and MS-compatible 
> compilers
> really do that?

    On x86, it's not needed. I'm not sure about other platforms.

    DS

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