16 Dec
2009
16 Dec
'09
5:44 a.m.
this was discussed at some considerable length on
jack-devel last
year, IIRC.
for single reader/single writer ringbuffers, i believe that we
concluded that memory barriers are not necessary.
No, to me the conclusion was: we can't programmatically prove that
memory
barriers are needed (even on the most vulnerable architectures),
but the theory
say that they are, and they should be added for correctness. See the "ring buffer memory barriers"
discussion on jack-devel back in
October of last year for more information; in particular, this article
by Paul E. McKenney is very helpful:
http://www.linuxjournal.com/article/8211
memory-barriers.txt of the linux kernel documentation is interesting as
well ...
cheers, tim
--
tim(a)klingt.org
http://tim.klingt.org
Contrary to general belief, an artist is never ahead of his time but
most people are far behind theirs.
Edgar Varèse