Re: [boost] Re: Threads: Atomic Counter

From: David Abrahams (abrahams_at_[hidden])
Date: 2000-08-31 11:30:22

----- Original Message -----
From: "William Kempf" <sirwillard_at_[hidden]>
> > The following Win32 functions don't work right on Win95:
> >
> > InterlockedCompareExchange
> > InterlockedCompareExchangePointer
> > InterlockedExchangeAdd
>
> But they do on Win98.  Tricky issue here.  I included the
> compare_exchange() only to bring up debate about its usefulness.
> I've never found a need for them, but didn't want to eliminate them
> just because I've never needed them, nor because Win95 didn't support
> them.  Obviously they can be added to Win95 in the form of some
> assembler instructions.

Just an additional data point: if I remember correctly, the Motorola 680x0,
where x > 2, includes atomic instructions for linking list elements in/out
of singly- and doubly-linked lists! These are called something like
"Atomic-compare-and-exchange" IIRC.

-Dave