[MPIWG Fortran] Questions about MPI_Comm_spawn

[Junchao Zhang]

How to get the length? Use len(argv(i)) and select an arbitrary i ?

--Junchao Zhang


On Tue, Mar 25, 2014 at 9:59 AM, Bill Long <longb at cray.com> wrote:

>
> On Mar 25, 2014, at 9:51 AM, Junchao Zhang <jczhang at mcs.anl.gov> wrote:
>
> > Hello, Fortran experts,
> >
> >   p.377 of MPI3 defines prototype of MPI_Comm_spawn.
> >
> >   MPI_Comm_spawn(command, argv, maxprocs, info, root, comm, intercomm,
> array_of_errcodes, ierror)
> >      CHARACTER(LEN=*), INTENT(IN) ::  command, argv(*)
> >      ...
> >
> > I can understand that command is a variable-length character. I fetch
> its length by len(command). The Fortran compiler needs to pass in data of
> command, as well as length of command.
> > But I can't understand argv(*). I interpret it as an assumed-size array
> of variable-length characters. Does that imply each argv(i) could have
> different lengths, e.g., len(argv(1)) may be different from len(argv(2))?
> > I think it is unreasonable, since if that, the compiler has to pass in
> length of every element of argv(*).
>
>
> It is unreasonable.  All elements of a character array have the same
> length.
>
> Cheers,
> Bill
>
>
> >
> > Thank you
> > --Junchao Zhang
> > _______________________________________________
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>
> Bill Long
>       longb at cray.com
> Fortran Technical Suport  &                                  voice:
> 651-605-9024
> Bioinformatics Software Development                     fax:  651-605-9142
> Cray Inc./ Cray Plaza, Suite 210/ 380 Jackson St./ St. Paul, MN 55101
>
>
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