Mailinglist Archive: opensuse-programming (118 mails)

[Jerry Feldman <gaf@xxxxxxx>]

On Thursday 28 April 2005 6:34 pm, Calkins, Dennis wrote:
> Hi,
>   I don't know if this is a compiler question or a platform question but
> it is definitely a programming question.
>
> On the new  M$ 64-bit  platform released this week, they support  ATOMIC
> operations on 64-bit values.
>
> Were do I find the equivalent  ATOMIC  functions on LINUX?
>
> In  asm-x86_64/atomic.h   I can only find operations that work on 32-bit
> values.
>
> Do I basically have to roll my own  versions of these functions?
>
> Is this something someone is looking to add to atomic.h for various
> platforms?
I have an Itanium system, and in atomic.h there are several functions that 
utilize longs (eg. 64 bit ).
static __inline__ int
ia64_atomic64_add (__s64 i, atomic64_t *v)
{
        __s64 old, new;
        CMPXCHG_BUGCHECK_DECL

        do {
                CMPXCHG_BUGCHECK(v);
                old = atomic_read(v);
                new = old + i;
        } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
        return new;
}

However, while this returns an int eventhough the values are 64-bit. I'm 
going to email the author. (BTW: This is in SLES9).

-- 
Jerry Feldman <gaf@xxxxxxx>
Boston Linux and Unix user group
http://www.blu.org PGP key id:C5061EA9
PGP Key fingerprint:053C 73EC 3AC1 5C44 3E14 9245 FB00 3ED5 C506 1EA9