Language safety in a multithread environment

Article: Fall Processor Forum 2006: IBM's POWER6
By: Linus Torvalds (torvalds.delete@this.osdl.org), October 25, 2006 5:24 pm
Room: Moderated Discussions
Tzvetan Mikov (tzvetanmi@yahoo.com) on 10/25/06 wrote:
>Linus Torvalds () on 10/25/06 wrote:
>>
>>And again, I'm hoping you never intend to run this on
>>alpha ;)
>
>You are really scaring me now. As Rob noted, we are mostly
>concerned with architectures other than the x86. Please,
>can you confirm that I understand you correctly that on
>Alpha the example code is broken and the Alpha needs a
>read barrier for dependent reads ??

Indeed. I can confirm that.

On alpha, even though you had a write barrier on the
writing side, and even though you have a data-
dependent address on the reading side, you may need a
read barrier on the read side.

The reason? Some alpha chips have a split cache setup,
where you may be able to read the address that was written
later on another CPU, before the data that was
written earlier has actually been processed by the reading
side on the "other" part of the cache.

So the writing side was done in the proper order,
but because the reading side is unordered even within
a particular receiving CPU in the absense of a read barrier,
you still need the read barrier.

In other words, you really can get strange situations.

There was this whole other discussion a few months ago
about memory ordering, where I was pointing out that the
weaker memory ordering of alpha was actually much worse
than x86 in many situations. This is one of them. You need
to either use strict locking, or totally insane amounts
of inappropriate memory ordering insutrctions.

>If that is true, it means that a Java or .NET (or any safe
>language) implementation on an Alpha needs a read barrier
>before accessing any global variable. I can only
>imagine the costs.

I would suggest proper locking.

>If it is true, it also raises the following questions:
>- Does it mean that the Alpha is (was) fundamentally
> unsuitable for safe languages ?

Well, I don't think "safe languages" per se is the
problem. "Strange threaded languages with certain models
of memory ordering, apparently including Java" - yes.

>- Are there any other architectures (prefereably not dead)
> with the same problem ?

Of the architectures Linux supports (and quite frankly,
that's pretty much every single relevant and half-way
relevant one), the only one that has this behaviour is the
alpha architecture.

We have a special macro called "smp_read_barrier_depends()"
to mark this case where we rely on this particular subtle
memory ordering requirement, and every other architecture
just defines that to be empty.

The kernel doesn't do a lot of lockless stuff, so it's
all generally ok. Almost always, when you actually expose
a piece of data structure globally, you need to lock the
data structure that you expose it in, so you do
have locking between "exposer" and "the rest of the world".

Quite frankly, I don't understand how you can avoid it
either. Your example with "GlobalPtr" didn't make much
sense from a real example standpoint, since normally you'd
not have one global pointer, you'd have a hash-table or
linked list or somethign else that you expose new entries
throgh, and that data structure needs locking
anyway.

But if the language has insane expectations, then yes,
alpha would not be a good target for that particular VM.

>well, "I" am the compiler, and "tmp->value=10" is the
>constructor, so in practice it isn't possible to put it
>before the barrier. It appears tempting to put a barrier
>after the constructor's body, but it doesn't help much
>because:

Well, quite frankly, as noted above, any really reasonable
use should have locking around the thing that
exposes it anyway, so all of this should be moot. I really
do get the feeling that people do things that aren't
safe anyway, and that the memory ordering issue is
just the tip of a much larger ice-berg.

The sad part about threaded programming is that locking
is hard, and most people get it seriously wrong, don't even
understand the rules, and then most of the time the end
result works anyway just by pure luck. And then
you end up having some occasional and totally undebuggable
bugs that hit you once in a blue moon in the customer
hands.

For example, the Linux kernel almost never does lockless
updates. They are too hard to get right, and too easy
for people to mess up. We have a few special cases, and
people are very VERY careful around them.

>b) The goal is not so much to prevent programming bugs
>(which isn't really possible), but to make sure "we" -
>the VM - never crash.

Yeah. It sounds like you're potentially adding overhead
just because the language itself is badly designed, and
allows buggy programs to then cause VM crashes. So with
a properly done locking at the app level, you'd never see
the issue in the first place.

How about just catching the SIGSEGV and telling the user
that he messed up instead? The memory barrier is free on
x86 (one of the reasons the x86 memory model is actually
very nice), but on other architectures even the write
barrier may well be fairly expensive, and it sounds like
you're protecting against something that isn't really even
worth protecting against.

If you take a performance hit, at least it should be
worth taking a hit over..

Linus
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
POWER6 article onlineDavid Kanter2006/10/16 10:31 PM
  POWER6 article onlineNiels Jørgen Kruse2006/10/16 11:59 PM
    POWER6 article onlineDavid Kanter2006/10/17 12:03 AM
      Interesting cachesPaul Aaron Clayton2006/10/17 06:35 AM
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    POWER6 article onlineGabriele Svelto2006/10/17 12:49 AM
      POWER6 article onlinerwessel2006/10/17 12:55 AM
      POWER6 article onlineDavid Kanter2006/10/17 01:01 AM
        POWER6 article onlineGabriele Svelto2006/10/17 01:06 AM
  BCD arithmetic remarkRob Thorpe2006/10/17 06:57 AM
    BCD arithmetic remarkDavid Kanter2006/10/17 08:04 AM
      BCD arithmetic remarkRob Thorpe2006/10/17 08:33 AM
        Java perfSerge Monkewitz2006/10/17 12:25 PM
          Java perfRob Thorpe2006/10/18 04:27 AM
            Java perfsp2006/10/18 04:50 AM
              Java perfRob Thorpe2006/10/18 08:36 AM
                Data parallelism in .NET using GPUsStephen Goss2006/10/18 11:48 PM
                  Data parallelism in .NET using GPUssp2006/10/19 01:08 AM
                    Data parallelism in .NET using GPUsStephen Goss2006/10/21 02:22 AM
                      Data parallelism in .NET using GPUsfastpathguru2006/11/01 02:30 PM
                        Data parallelism in .NET using GPUsIan Ameline2006/11/01 05:31 PM
                Java perfGabriele Svelto2006/10/19 12:23 AM
                  Java perfRob Thorpe2006/10/19 02:58 AM
              Numerical Java perfWes Felter2006/10/18 10:25 AM
                Numerical Java perfsp2006/10/18 10:46 AM
                  Numerical Java perfRob Thorpe2006/10/18 11:23 AM
                    Numerical Java perfTzvetan Mikov2006/10/18 11:44 AM
                      Numerical Java perfRob Thorpe2006/10/19 04:30 AM
                        Numerical Java perfsp2006/10/19 05:22 AM
                          Numerical Java perfGabriele Svelto2006/10/19 05:33 AM
                          Numerical Java perfRob Thorpe2006/10/19 07:08 AM
                            Numerical Java perfJuho Snellman2006/10/20 08:38 AM
                              Numerical Java perfRob Thorpe2006/10/23 04:54 AM
                                SBCL garbage collectorJuho Snellman2006/10/25 03:29 AM
                          Numerical Java perfTzvetan Mikov2006/10/19 09:04 AM
                        Language safety in a multithread environmentTzvetan Mikov2006/10/19 09:34 AM
                          Language safety in a multithread environmentRicardo B2006/10/19 11:43 AM
                            Language safety in a multithread environmentTzvetan Mikov2006/10/19 12:11 PM
                              Language safety in a multithread environmentRicardo B2006/10/19 02:23 PM
                                Language safety in a multithread environmentTzvetan Mikov2006/10/19 04:08 PM
                                  Language safety in a multithread environmentRicardo B2006/10/20 05:04 AM
                                    Language safety in a multithread environmentTzvetan Mikov2006/10/20 01:53 PM
                                      Language safety in a multithread environmentRicardo B2006/10/20 02:06 PM
                                      PSRicardo B2006/10/20 02:12 PM
                                        PSTzvetan Mikov2006/10/20 03:30 PM
                          Language safety in a multithread environmentGabriele Svelto2006/10/20 01:26 AM
                            Language safety in a multithread environmentTzvetan Mikov2006/10/20 01:34 PM
                              Language safety in a multithread environmentS. Rao2006/10/20 08:39 PM
                                Language safety in a multithread environmentTzvetan Mikov2006/10/21 09:39 AM
                                  Language safety in a multithread environmentS. Rao2006/10/21 03:54 PM
                                    Language safety in a multithread environmentRicardo B2006/10/21 04:45 PM
                                    Language safety in a multithread environmentTzvetan Mikov2006/10/22 09:42 AM
                                      Language safety in a multithread environmentRob Thorpe2006/10/23 09:35 AM
                                        Language safety in a multithread environmentLinus Torvalds2006/10/23 04:06 PM
                                          Language safety in a multithread environmentTzvetan Mikov2006/10/23 11:55 PM
                                            Language safety in a multithread environmentLinus Torvalds2006/10/24 07:35 AM
                                              Language safety in a multithread environmentTzvetan Mikov2006/10/24 11:26 AM
                                                ClarificationTzvetan Mikov2006/10/24 12:15 PM
                                                Language safety in a multithread environmentLinus Torvalds2006/10/25 07:37 AM
                                                  Language safety in a multithread environmentRob Thorpe2006/10/25 07:52 AM
                                                  Language safety in a multithread environmentTzvetan Mikov2006/10/25 09:01 AM
                                                    Language safety in a multithread environmentLinus Torvalds2006/10/25 05:24 PM
                                                      Language safety in a multithread environmentS. Rao2006/10/25 06:08 PM
                                                        Other approachesRob Thorpe2006/10/26 10:09 AM
                                                          Hang on I forgot the other approachesRob Thorpe2006/10/26 10:27 AM
                                                            Hang on I forgot the other approachesS. Rao2006/10/26 02:16 PM
                                                      Language safety in a multithread environmentGabriele Svelto2006/10/26 03:56 AM
                                                        Language safety in a multithread environmentLinus Torvalds2006/10/26 07:52 AM
                                                          Language safety in a multithread environmentGabriele Svelto2006/10/26 08:11 AM
                                                            "Safety" and different types of safetyRob Thorpe2006/10/26 08:58 AM
                                                              "Safety" and different types of safetyLinus Torvalds2006/10/26 09:26 AM
                                                                "Safety" and different types of safetyRob Thorpe2006/10/26 09:50 AM
                                                                  "Safety" and different types of safetyTzvetan Mikov2006/10/26 10:56 AM
                                                                    Exactly!Gabriele Svelto2006/10/27 12:29 AM
                                                                  message passing languagesFoo_2006/10/28 01:19 AM
                                                        Language safety in a multithread environmentRob Thorpe2006/10/26 10:45 AM
                                                          RecapTzvetan Mikov2006/10/26 11:19 AM
                                                            Information and ickiness on JavaRob Thorpe2006/10/27 04:38 AM
                                                              Excellent threadJasonB2006/10/27 02:57 PM
                                                                Excellent threadsp2006/10/28 12:38 AM
                                                              Information and ickiness on JavaTzvetan Mikov2006/10/27 05:12 PM
                                                      Language safety in a multithread environmentTzvetan Mikov2006/10/26 08:17 AM
                                                        Language safety in a multithread environmentLinus Torvalds2006/10/26 08:57 AM
                                                          Language safety in a multithread environmentRob Thorpe2006/10/26 09:38 AM
                                                            Language safety in a multithread environmentS. Rao2006/10/26 02:51 PM
                                                              Language safety in a multithread environmentRob Thorpe2006/10/27 01:26 AM
                                                                Language safety in a multithread environmentLinus Torvalds2006/10/27 08:40 AM
                                                                  Language safety in a multithread environmentRob Thorpe2006/10/27 09:06 AM
                                                                    Language safety in a multithread environmentLinus Torvalds2006/10/27 10:53 AM
                                                                      Language safety in a multithread environmentrwessel2006/10/27 03:21 PM
                                                                        Explicit vs implicit barriersTzvetan Mikov2006/10/27 05:39 PM
                                                                          Explicit vs implicit barriersLinus Torvalds2006/10/27 06:28 PM
                                                                            Explicit vs implicit barriersTzvetan Mikov2006/10/28 06:02 PM
                                                                              Explicit vs implicit barriersLinus Torvalds2006/10/28 07:55 PM
                                                                                Explicit vs implicit barriersRob Thorpe2006/10/31 12:37 PM
                                                                            Explicit vs implicit barriersRob Thorpe2006/10/31 12:15 PM
                                                                          Explicit vs implicit barriersrwessel2006/10/27 06:39 PM
                                                                      Why OoO stores are evil but OoO loads are o.k.?Michael S2006/10/28 02:10 PM
                                                                        Why OoO stores are evil but OoO loads are o.k.?Linus Torvalds2006/10/28 04:29 PM
                                                                          Why OoO stores are evil but OoO loads are o.k.?Ricardo B2006/10/30 06:36 AM
                                                                            Why OoO stores are evil but OoO loads are o.k.?Linus Torvalds2006/10/30 09:57 AM
                                                                              Why OoO stores are evil but OoO loads are o.k.?Tzvetan Mikov2006/10/30 11:55 AM
                                                                                Why OoO stores are evil but OoO loads are o.k.?Michael S2006/10/30 12:14 PM
                                                                                  Why OoO stores are evil but OoO loads are o.k.?Tzvetan Mikov2006/10/30 12:20 PM
                                                                                    Why OoO stores are evil but OoO loads are o.k.?Michael S2006/10/30 01:11 PM
                                                                                      A reference would be nice :-) (NT)Tzvetan Mikov2006/10/30 01:32 PM
                                                                                        A reference Michael S2006/10/30 03:37 PM
                                                                                          A reference Tzvetan Mikov2006/11/03 08:57 PM
                                                                                            check your e-mbox (NT)Michael S2006/11/04 12:47 PM
                                                                                      Why OoO stores are evil but OoO loads are o.k.?David Kanter2006/10/30 01:40 PM
                                                                                        Why OoO stores are evil but OoO loads are o.k.?Michael S2006/10/30 02:28 PM
                                                                                          Why OoO stores are evil but OoO loads are o.k.?David Kanter2006/10/30 02:43 PM
                                                                                            Why OoO stores are evil but OoO loads are o.k.?Michael S2006/10/30 04:36 PM
                                                                                              Why OoO stores are evil but OoO loads are o.k.?David Kanter2006/10/30 10:14 PM
                                                                                Why OoO stores are evil but OoO loads are o.k.?Linus Torvalds2006/10/30 12:53 PM
                                                                      Language safety in a multithread environmentRob Thorpe2006/10/31 11:25 AM
                                                                        Language safety in a multithread environmentLinus Torvalds2006/10/31 12:59 PM
                                                                          Language safety in a multithread environmentRob Thorpe2006/10/31 01:38 PM
                                                                            Language safety in a multithread environmentLinus Torvalds2006/10/31 02:02 PM
                                                                              Language safety in a multithread environmentLinus Torvalds2006/10/31 03:54 PM
                                                                                Will reply tommorrow, very busy today (NT)Rob Thorpe2006/11/01 11:14 AM
                                                                              Language safety in a multithread environmentRob Thorpe2006/11/02 01:30 PM
                                                                                Language safety in a multithread environmentrwessel2006/11/02 02:06 PM
                                                                                  Language safety in a multithread environmentGabriele Svelto2006/11/03 02:39 AM
                                                                                    Language safety in a multithread environmentLinus Torvalds2006/11/03 09:40 AM
                                                                                      Language safety in a multithread environmentGabriele Svelto2006/11/03 10:12 AM
                                                                                        Language safety in a multithread environmentLinus Torvalds2006/11/03 01:20 PM
                                                                                          Language safety in a multithread environmentGabriele Svelto2006/11/06 03:42 AM
                                                                                      Language safety in a multithread environmentEric Bron2006/11/04 04:47 AM
                                                                                        Language safety in a multithread environmentGabriele Svelto2006/11/06 04:13 AM
                                                                                      Language safety in a multithread environmentWilco2006/11/04 12:29 PM
                                                                                        Language safety in a multithread environmentRicardo B2006/11/04 02:54 PM
                                                                                        Language safety in a multithread environmentGabriele Svelto2006/11/06 03:54 AM
                                                                                          Language safety in a multithread environmentWilco2006/11/06 12:26 PM
                                                                                            Language safety in a multithread environmentGabriele Svelto2006/11/07 01:54 AM
                                                                                              Language safety in a multithread environmentWilco2006/11/07 04:34 PM
                                                                                                Language safety in a multithread environmentGabriele Svelto2006/11/08 02:29 AM
                                                                                      Language safety in a multithread environmentrwessel2006/11/04 10:13 PM
                                                                                        Language safety in a multithread environmentrwessel2006/11/04 10:23 PM
                                                                                      Language safety in a multithread environmentMichael S2006/11/05 04:05 AM
                                                                                        Language safety in a multithread environmentLinus Torvalds2006/11/05 10:14 AM
                                                                                          unaligned SSE testsEric Bron2006/11/05 02:26 PM
                                                                                            unaligned SSE testsMichael S2006/11/05 03:47 PM
                                                                                              unaligned SSE testsEric Bron2006/11/05 04:23 PM
                                                                                                unaligned SSE testsMichael S2006/11/05 05:03 PM
                                                                                                  unaligned SSE testsEric Bron2006/11/05 05:28 PM
                                                                                                    Now results make sense. How about Psc? (NT)Michael S2006/11/05 05:37 PM
                                                                                                      tomorrow, it's 01:43 PM where I'm (NT)Eric Bron2006/11/05 05:44 PM
                                                                                                        I mean 01:43 AM (NT)Eric Bron2006/11/05 05:45 PM
                                                                                                      PSC scoresEric Bron2006/11/06 02:25 AM
                                                                                                        PSC scoresMichael S2006/11/06 04:28 AM
                                                                                                          PSC scoresIan Ameline2006/11/06 09:00 AM
                                                                                                            meaningful performance gainMichael S2006/11/06 09:33 AM
                                                                                                              meaningful performance gainLinus Torvalds2006/11/06 11:15 AM
                                                                                                                Dynamically resolved alignmentDavid Kanter2006/11/06 12:49 PM
                                                                                                                  Dynamically resolved alignmentRicardo B2006/11/06 01:46 PM
                                                                                                                  Dynamically resolved alignmentLinus Torvalds2006/11/06 01:48 PM
                                                                                                                meaningful performance gainEric Bron2006/11/07 02:23 AM
                                                                                                        RE: "I suppose we will have to continue to align" ...Not really :)redpriest2006/11/06 05:11 PM
                                                                                                          Your point?Michael S2006/11/06 05:47 PM
                                                                                                            Actually Michael, it's quite a bit more than that.redpriest2006/11/06 06:30 PM
                                                                                                              Actually Michael, it's quite a bit more than that.anonymous2006/11/06 08:36 PM
                                                                                                                Actually Michael, it's quite a bit more than that.Linus Torvalds2006/11/06 09:01 PM
                                                                                                                  Actually Michael, it's quite a bit more than that.Rob Thorpe2006/11/07 03:31 AM
                                                                                                                  Actually Michael, it's quite a bit more than that.anonymous2006/11/07 07:27 AM
                                                                                                              link vs linqMichael S2006/11/07 02:04 AM
                                                                                                                link vs linqanonymous2006/11/07 07:13 AM
                                                                                                                  Thank you (NT)Michael S2006/11/07 08:04 AM
                                                                                                          Barcelona dreamsEric Bron2006/11/07 01:08 AM
                                                                                          Language safety in a multithread environmentWilco2006/11/05 03:14 PM
                                                                                            Language safety in a multithread environmentRicardo B2006/11/05 03:56 PM
                                                                                              Language safety in a multithread environmentWilco2006/11/05 06:52 PM
                                                                                                Language safety in a multithread environmentRicardo B2006/11/05 09:09 PM
                                                                                                  Language safety in a multithread environmentWilco2006/11/06 02:25 PM
                                                                                                    Language safety in a multithread environmentRicardo B2006/11/06 03:48 PM
                                                                                                      Language safety in a multithread environmentWilco2006/11/06 04:44 PM
                                                                                                        Language safety in a multithread environmentRicardo B2006/11/06 04:53 PM
                                                                                                        A common problemRob Thorpe2006/11/07 09:45 AM
                                                                                                          A common problemWilco2006/11/09 04:46 PM
                                                                                                            A common problemRob Thorpe2006/11/10 08:29 AM
                                                                                                              A common problemrwessel2006/11/13 04:47 PM
                                                                                                                A common problemWilco2006/11/13 05:51 PM
                                                                                                                  A common problemRob Thorpe2006/11/14 03:38 AM
                                                                                                                    A common problemLinus Torvalds2006/11/14 09:37 AM
                                                                                                                      A common problemRob Thorpe2006/11/14 11:18 AM
                                                                                                                        A common problemagony2006/11/14 02:57 PM
                                                                                                                          A common problemrwessel2006/11/14 04:13 PM
                                                                                                                            A common problemAndi Kleen2006/11/15 04:24 AM
                                                                                                                              A common problemrwessel2006/11/15 04:42 PM
                                                                                                                        A common problemDoug Siebert2006/11/14 09:50 PM
                                                                                                                          x86 versus other platformsDavid Kanter2006/11/15 12:58 AM
                                                                                                                            x86 versus other platformsj2006/11/15 01:57 AM
                                                                                                                          A common problemRob Thorpe2006/11/15 11:56 AM
                                                                                                                            A common problemWilco2006/11/15 01:54 PM
                                                                                                                              A common problemCarlie Coats2006/11/16 06:44 AM
                                                                                                                              A common problemLinus Torvalds2006/11/16 10:03 AM
                                                                                                                      A common problemCarlie Coats2006/11/16 06:38 AM
                                                                                                                        A common problemRob Thorpe2006/11/16 07:29 AM
                                                                                                                    A common problemWilco2006/11/15 02:13 PM
                                                                                                                      A common problemRob Thorpe2006/11/16 09:20 AM
                                                                                                                        A common problemrwessel2006/11/16 04:27 PM
                                                                                                                        A common problemWilco2006/11/17 02:20 PM
                                                                                                                          A common problemRob Thorpe2006/11/20 04:14 AM
                                                                                          You are aiming too lowMichael S2006/11/05 04:19 PM
                                                                                            And you're aiming quite highRob Thorpe2006/11/06 08:00 AM
                                                                                    Language safety in a multithread environmentWilco2006/11/04 11:20 AM
                                                                                      Language safety in a multithread environmentGabriele Svelto2006/11/06 04:10 AM
                                                                                        Language safety in a multithread environmentWilco2006/11/06 10:59 AM
                                                                                          Language safety in a multithread environmentGabriele Svelto2006/11/08 02:47 AM
                                                                                            Language safety in a multithread environmentWilco2006/11/13 05:13 PM
                                                                                              Language safety in a multithread environmentGabriele Svelto2006/11/14 02:15 AM
                                                                                                Language safety in a multithread environmentWilco2006/11/17 02:51 PM
                                                                                    Language safety in a multithread environmentrwessel2006/11/04 10:11 PM
                                                                                  Language safety in a multithread environmentRob Thorpe2006/11/03 09:58 AM
                                                                  Language safety in a multithread environmentbandwidth2006/10/27 06:47 PM
                                                                    Language safety in a multithread environmentLinus Torvalds2006/10/27 07:52 PM
                                                                      Language safety in a multithread environmentLinus Torvalds2006/10/27 08:10 PM
                                                                        Language safety in a multithread environmentbandwidth2006/10/28 03:17 AM
                                                                      Language safety in a multithread environmentbandwidth2006/10/28 03:09 AM
                                                                        Language safety in a multithread environmentLinus Torvalds2006/10/28 09:23 AM
                                                                      Language safety in a multithread environmentGabriele Svelto2006/10/30 03:26 AM
                                                                        Language safety in a multithread environmentRicardo B2006/10/30 06:52 AM
                                                                        Language safety in a multithread environmentJasonB2006/10/30 07:12 AM
                                                                          Language safety in a multithread environmentGabriele Svelto2006/10/30 07:28 AM
                                                                            Language safety in a multithread environmentJasonB2006/10/30 08:32 AM
                                                                              Language safety in a multithread environmentGabriele Svelto2006/10/30 08:48 AM
                                                                                Language safety in a multithread environmentJasonB2006/10/30 09:21 AM
                                                                          Language safety in a multithread environmentRicardo B2006/10/30 07:31 AM
                                                                            Language safety in a multithread environmentGabriele Svelto2006/10/30 07:43 AM
                                                                              Language safety in a multithread environmentRicardo B2006/10/30 07:54 AM
                                                                                Language safety in a multithread environmentGabriele Svelto2006/10/30 08:02 AM
                                                                                  Language safety in a multithread environmentRicardo B2006/10/30 08:12 AM
                                                                                    Language safety in a multithread environmentGabriele Svelto2006/10/30 08:29 AM
                                                                                      Language safety in a multithread environmentRicardo B2006/10/30 08:40 AM
                                                                                Language safety in a multithread environmentdraugaz2006/10/30 12:31 PM
                                                                              Language safety in a multithread environmentLinus Torvalds2006/10/30 10:09 AM
                                                                                Language safety in a multithread environmentGabriele Svelto2006/10/31 02:01 AM
                                                                                  Language safety in a multithread environmentLinus Torvalds2006/10/31 08:59 AM
                                                                    Language safety in a multithread environmentpgerassi2006/10/27 08:00 PM
                                                                      Language safety in a multithread environmentbandwidth2006/10/28 03:25 AM
                                                                        Language safety in a multithread environmentpgerassi2006/10/31 01:32 AM
                                                                      Language safety in a multithread environmentRob Thorpe2006/10/31 06:52 AM
                                                        pythonFoo_2006/10/28 01:51 AM
                                                          pythonTzvetan Mikov2006/10/28 04:55 PM
                                                            pythonFoo_2006/10/29 03:51 AM
                                                          pythonRob Thorpe2006/10/31 05:01 AM
                                        Language safety in a multithread environmentTzvetan Mikov2006/10/24 10:53 AM
                                          Language safety in a multithread environmentRob Thorpe2006/10/25 01:00 AM
                                          Language safety in a multithread environment (Lock-free structures)Ray2006/10/28 11:25 AM
                                            Language safety in a multithread environment (Lock-free structures)Linus Torvalds2006/10/28 11:58 AM
                                              Language safety in a multithread environment (Lock-free structures)Ray2006/10/28 04:47 PM
                                                Language safety in a multithread environment (Lock-free structures)Linus Torvalds2006/10/28 08:02 PM
                                        Language safety in a multithread environmentJuho Snellman2006/10/25 03:59 AM
                                          Language safety in a multithread environmentRob Thorpe2006/10/25 04:38 AM
                                            Language safety in a multithread environmentJuho Snellman2006/10/25 06:38 AM
                                              Language safety in a multithread environmentRob Thorpe2006/10/25 07:06 AM
                                                More on this topicRob Thorpe2006/10/25 08:41 AM
                                                  More on this topicTzvetan Mikov2006/10/25 10:17 AM
                                                    More on this topicRob Thorpe2006/10/26 02:02 AM
                                                Language safety in a multithread environmentJuho Snellman2006/10/25 10:33 AM
                                                  Language safety in a multithread environmentRob Thorpe2006/10/26 01:48 AM
                                      Language safety in a multithread environmentS. Rao2006/10/23 03:40 PM
                                        Language safety in a multithread environmentTzvetan Mikov2006/10/23 11:38 PM
                                        Language safety in a multithread environmentGabriele Svelto2006/10/24 01:02 AM
                                          Language safety in a multithread environmentS. Rao2006/10/24 12:40 PM
                                        Comparison to stack allocationRob Thorpe2006/10/24 03:09 AM
                                          Comparison to stack allocationS. Rao2006/10/24 12:32 PM
                                            Exactly, see my other post (NT)Rob Thorpe2006/10/25 12:53 AM
                          Language safety in a multithread environmentDavid Wragg2006/10/20 02:46 AM
                            Language safety in a multithread environmentTzvetan Mikov2006/10/21 09:24 AM
                          Ugh, evil problemRob Thorpe2006/10/20 03:56 AM
                            Ugh, evil problemGabriele Svelto2006/10/20 04:38 AM
                              Ugh, evil problemRob Thorpe2006/10/20 05:47 AM
                                Ugh, evil problemGabriele Svelto2006/10/20 05:54 AM
                                Ugh, evil problemRicardo B2006/10/20 06:43 AM
                            Ugh, evil problemJasonB2006/10/20 06:17 AM
                              Ugh, evil problemS. Rao2006/10/20 08:09 PM
                                Ugh, evil problemJasonB2006/10/21 07:58 AM
                                SecondedRob Thorpe2006/10/23 01:53 AM
                          Copying GC Rob Thorpe2006/10/23 02:51 AM
                            Copying GC Tzvetan Mikov2006/10/23 11:13 PM
                              Copying GC Rob Thorpe2006/10/24 01:22 AM
              Python + native extensionsFoo_2006/10/18 02:29 PM
                Python + native extensionssp2006/10/19 01:05 AM
  z9 - Power5 connection?foobar2006/10/17 01:15 PM
    z9 - Power5 connection?David Kanter2006/10/17 02:03 PM
      z9 - Power5 connection?foobar2006/10/17 02:33 PM
        z9 - Power5 connection?rwessel2006/10/17 07:39 PM
          z9 - Power5 connection?foobar2006/10/17 08:38 PM
            Sounds like I should edit the article...David Kanter2006/10/17 10:48 PM
            z9 - Power5 connection?Jesper Frimann2006/10/17 11:59 PM
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How do you spell avocado?