[Mpi-comments] MPI_Is_thread_main: usage allowed for any thread in MPI_THREAD_FUNNELED mode?

[Philippe Wautelet]

Dear all,

It is not clear to me if I am allowed to make calls to MPI_Is_thread_main from 
any thread if I initialized MPI with the MPI_THREAD_FUNNELED mode. For this 
mode, the norm says:
"the application must ensure that only the main thread makes MPI calls" (page 
384, lines 46-47)
Therefore, a call to MPI_Is_thread_main should be incorrect. But in this case, 
how can I determine which thread is the main one? Or, maybe, some MPI calls 
could be explicitly allowed to be made by any thread?

Best regards,

Philippe Wautelet


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Philippe Wautelet (Research Engineer)   wautelet at idris.fr
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