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Subject: Re: [OMPI devel] MPI_Is_thread_main() with provided=MPI_THREAD_SERIALIZED
From: George Bosilca (bosilca_at_[hidden])
Date: 2013-09-04 06:11:47


You're in the SERIALIZED mode, so any thread can make MPI calls. As in such mode there is no notion of thread_main, consistently returning true out of MPI_Is_thread_main seem like a reasonable approach.

This function will have a different behavior in the FUNNELED mode.

  George.

On Sep 4, 2013, at 12:06 , Lisandro Dalcin <dalcinl_at_[hidden]> wrote:

> I'm using Open MPI 1.6.5 as packaged in Fedora 19. This build does not
> enable THREAD_MULTIPLE support:
>
> $ ompi_info | grep Thread
> Thread support: posix (MPI_THREAD_MULTIPLE: no, progress: no)
>
> In my code I call MPI_Init_thread(required=MPI_THREAD_MULTIPLE). After
> that, MPI_Query_thread() returns MPI_THREAD_SERIALIZED. But calling
> MPI_Is_thread_main() always return TRUE, either in the main thread or
> in newly spawned threads.
>
> I think this code is wrong for the case provided==MPI_THREAD_SERIALIZED :
> https://bitbucket.org/ompiteam/ompi-svn-mirror/src/0a159982d7204d4b4b9fa61771d0fc7e9dc16771/ompi/mpi/c/is_thread_main.c?at=default#cl-50
>
>
> --
> Lisandro Dalcin
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