[Mpi-forum] MPI_Initialized, MPI_Query_thread, MPI_Is_thread_main

[Jeff Hammond]

See https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/357.

It's not a proposal in the sense that I do not have a PDF
demonstrating a LaTeX implementation of the suggested text changes,
but I did provide in my ticket the text changes I think address this
issue.

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:
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>
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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.alcf.anl.gov/parts/index.php/User:Jhammond