[zeromq-dev] atomic ops

[Steven McCoy]

On 9 February 2012 01:14, Ivan Pechorin <ivan.pechorin at gmail.com> wrote:

> 2012/2/8 Steven McCoy <steven.mccoy at miru.hk>:
> >
> > Compare with my atomics:
> >
> >
> http://code.google.com/p/openpgm/source/browse/trunk/openpgm/pgm/include/pgm/atomic.h
>
> Steven, what is the reason to use asm on Solaris/x86 instead of
> Solaris intrinsics from <atomic.h> ?
>

Solaris intrinsics are actually poorer implementations using CAS-only.


>
> #elif (defined( __SUNPRO_C ) || defined( __SUNPRO_CC )) && (defined(
> __i386 ) || defined( __amd64 ))
>        uint32_t result = val;
>         __asm__ volatile ("lock; xaddl %0, %1"
>                        :: "r" (result), "m" (*atomic)  );
>        return result;
>
> And (sorry for stupid question), why the asm for x86/x86_64 is
> different for SunCC and for GCC/ICC ?
>

SunCC doesn't support the same level of clobber clauses.


>
> By the way, HP-UX also has the same intrinsics in <atomic.h>.
> So, I believe, it's worth changing
>
> #if defined( __sun )
> #       include <atomic.h>
>
> to something like this:
>
> #if (defined(sun) || defined(__sun) || defined(hpux) || defined(__hpux))
>
>
I don't support IA64 in quite a few places in the code which is why there
is no HP-UX support.

-- 
Steve-o
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