On Tue, 12 Nov 2002, David Dufresne wrote:
> > There are two things to the barrier. One is to make sure CPU does not
> > prefetch the old value and another is to make sure, that compiler does
> > not reorder the statements!
> >
> The first one is a hardware memory barrier:
> #define mb() __asm__ __volatile__ ("lock; addl $0,0(%esp)": : :"memory")
sfence, mfence, lfence ops on newer processors too.
Zwane
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