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Re: Memory Model
gcc.gnu.org bounced the previous email for some reason...
On 03/12/2012 06:51 PM, Joe Gottman wrote:
On 3/12/2012 8:44 AM, Andrew MacLeod wrote:
On 03/10/2012 09:17 AM, Joe Gottman wrote:
According to the news on the front page, the C++11 memory model
has been added to gcc. But C++11 status page
(http://gcc.gnu.org/projects/cxx0x.html) says that it hasn't. Is
this an oversight?
Atomic support with memory model parameters have been added, but
complete support is not quite there yet. A full optimization audit
has not been performed, so it is possible to introduce data races
which were not there before. Bitfields operations do not yet conform
either.
That said, any one who encounters cases where those memory model
non-compliances occur should open a bugzilla so we can make sure we
have them covered in 4.8.
OK. Does it say anywhere on the website exactly what can and can't
be done with respect to the memory model?
Well, perhaps not in so many words. The information is all there, but
not in a nice summary format. I have updated the atomics wiki (pointed
to from the News page) to have a GCC 4.7 status which should spell out
what you can expect.
http://gcc.gnu.org/wiki/Atomic/GCCMM
Does that help?
Andrew