[Mpi-forum] MPI_Initialized, MPI_Query_thread, MPI_Is_thread_main

[Jeff Hammond]

I can't make it in January.  If someone can read it for me, I will write
the text.

These questions arose out of my careful reading of ticket 302, so it would
make sense if you were willing to read them, since I think they are related.

Jeff

On Fri, Dec 16, 2011 at 10:38 AM, Jeff Squyres <jsquyres at cisco.com> wrote:

> +1 / good points.
>
> Will you make a proposal about this?
>
>
> On Dec 16, 2011, at 10:44 AM, Jeff Hammond wrote:
>
> > Are MPI_Initialized and MPI_Query_thread guaranteed to be thread-safe
> > by all implementations?  If these MPI calls cannot be made in a fully
> > multithreaded context, how can a multithreaded library determine that
> > it can make MPI calls in an unrestricted fashion, i.e. determine if
> > MPI was initialized with MPI_THREAD_MULTIPLE?  Must the multithreaded
> > library mutex around these two MPI calls and assume that
> > MPI_THREAD_SERIALIZED is always available?
> >
> > Can MPI_Is_thread_main be called from a thread that is not main when
> > only MPI_THREAD_FUNNELED is supported?  I recall that the funneled
> > mode stipulates that only the main thread can make MPI calls and there
> > is no text excepting this routine from that constraint.
> >
> > Thanks,
> >
> > Jeff
> >
> > --
> > Jeff Hammond
> > Argonne Leadership Computing Facility
> > University of Chicago Computation Institute
> > jhammond at alcf.anl.gov / (630) 252-5381
> > http://www.linkedin.com/in/jeffhammond
> > https://wiki-old.alcf.anl.gov/index.php/User:Jhammond
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>
>
> --
> Jeff Squyres
> jsquyres at cisco.com
> For corporate legal information go to:
> http://www.cisco.com/web/about/doing_business/legal/cri/
>
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-- 
Jeff Hammond
Argonne Leadership Computing Facility
University of Chicago Computation Institute
jhammond at alcf.anl.gov / (630) 252-5381
http://www.linkedin.com/in/jeffhammond
https://wiki-old.alcf.anl.gov/index.php/User:Jhammond
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