This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: C++11 atomic library notes
- From: "Joseph S. Myers" <joseph at codesourcery dot com>
- To: Andrew MacLeod <amacleod at redhat dot com>
- Cc: Richard Henderson <rth at redhat dot com>, Lawrence Crowl <crowl at google dot com>, Benjamin Kosnik <bkoz at redhat dot com>, Aldy Hernandez <aldyh at redhat dot com>, GCC <gcc at gcc dot gnu dot org>
- Date: Mon, 3 Oct 2011 19:52:36 +0000 (UTC)
- Subject: Re: C++11 atomic library notes
- References: <4E862864.2010607@redhat.com> <4E89F171.4060808@redhat.com> <4E89F6C6.8050504@redhat.com>
On Mon, 3 Oct 2011, Andrew MacLeod wrote:
> On 10/03/2011 01:31 PM, Richard Henderson wrote:
> > On 09/30/2011 01:36 PM, Andrew MacLeod wrote:
> > > http://gcc.gnu.org/wiki/Atomic/GCCMM/LIbrary
> >
> > > __atomic_store (size_t obj_size, T *mem, T val, enum memory_model
> > > model)
> > I don't like this. I really cannot imagine any situation for which the
> > compiler can't resolve SIZE to a compile-time constant. I think it's
> > pointless to have a dispatch routine that just calls all of
> >
> its a library call for arbitrary sized objects... C++ can have any class
> declared atomic, so it doesn't have to map to one of those optimized lock-free
> routines.
Likewise, in C1X you can also apply _Atomic to arbitrary-size structures.
--
Joseph S. Myers
joseph@codesourcery.com