[concurrency-interest] Java Memory Model and ParallelStream
aph at redhat.com
Fri Mar 6 09:44:52 EST 2020
On 3/6/20 2:35 PM, Luke Hutchison wrote:
> On Fri, Mar 6, 2020, 7:15 AM Andrew Haley <aph at redhat.com> wrote:
>> The CPU *hardware* does this all the time. Few processors have a
>> total store order: x86, which does, is the exception here.
> Well that gets at my core question: whether a computational barrier always
> strictly enforces memory happens-before ordering across the barrier, i.e.
> whether a computational barrier
To answer that I'd need to be told what a "computational barrier" is. I
have some guesses, but I think you should spell it out.
> is always also a memory ordering barrier.
> If the CPU does not have a total store order, I could imagine cases where a
> computational barrier does not enforce memory ordering. What am I missing?
Andrew Haley (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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