OK, I take that back. Based on the MPI standard (age 488) only the thread that called MPI_Init or MPI_Init_thread must return true in this case. The logic I was exposing in my previous email is left to the user.
George. On Sep 4, 2013, at 12:11 , George Bosilca <bosi...@icl.utk.edu> wrote: > 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 <dalc...@gmail.com> 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 >> --------------- >> CIMEC (INTEC/CONICET-UNL) >> Predio CONICET-Santa Fe >> Colectora RN 168 Km 472, Paraje El Pozo >> 3000 Santa Fe, Argentina >> Tel: +54-342-4511594 (ext 1011) >> Tel/Fax: +54-342-4511169 >> _______________________________________________ >> devel mailing list >> de...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/devel >
