[pypy-dev] Question about Atomic_ops.h in STM

[Armin Rigo]

Hi Andrew,

On Mon, Jan 30, 2012 at 21:09, Andrew Francis <andrewfr_ice at yahoo.com> wrote:
> I noticed a compare_and_swap function in atomic_ops.h. On the IRC channel,
> it was suggested that I look in _rffi_stm.py. However it is not there (I can
> understand thta). How can this function be exposed to a RPython programme?
> The reason I am asking is if compare and swap functions are available, it
> ought to be possible to write stuff like a lock-free list. Also this give me
> a chance to learn more about RPython.

Indeed, compare_and_swap() is not exposed to RPython.  We don't need
it, because it's only called from "et.c", another C source.  RPython
has no similar atomic operations so far.


Armin