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Re: [Qemu-devel] Java volatile vs. C11 seq_cst (was Re: [PATCH v2 1/2] a

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Java volatile vs. C11 seq_cst (was Re: [PATCH v2 1/2] add a header file for atomic operations)
Date: Wed, 19 Jun 2013 11:30:37 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 18/06/2013 19:38, Andrew Haley ha scritto:
>> > Or is Java volatile somewhere between acq_rel and seq_cst, as the last
>> > paragraph of
>> > http://www.cs.umd.edu/~pugh/java/memoryModel/jsr-133-faq.html#volatile
>> > seems to suggest?
> As far as I know, the Java semantics are acq/rel.  I can't see anything
> there that suggests otherwise.  If we'd wanted to know for certain we
> should have CC'd Doug lea.

acq/rel wouldn't have a full store-load barrier between a volatile store
and a volatile load.


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