v3.0.x: mpi/fortran: fix parsing arrays of Fortran strings #5018
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MPI defines the "argv" param to Fortran MPI_COMM_SPAWN as being terminated by a blank string. While not precisely defined (except through a non-binding example, Example 10.2, MPI-3.1 p382:6-29), one can infer that the "array_of_argv" param to Fortran MPI_COMM_SPAWN_MULTIPLE is also a set of argv, each of which are terminated by a blank line. The "array_of_commands" argument to Fortran MPI_COMM_SPAWN_MULTIPLE is a little less well-defined. It is *assumed* to be of length "count" (another parameter to MPI_COMM_SPAWN_MULTIPLE) -- and *not* be terminated by a blank string. This is also given credence by the same example 10.2 in MPI-3.1. The previous code assumed that "array_of_commands" should also be terminated by a blank line -- but per the above, this is incorrect. Instead, we should just parse our "count" number of strings from "array_of_commands" and *not* look for a blank line termination. This commit separates these two cases: * ompi_fortran_argv_blank_f2c(): parse a Fortran array of strings out and stop when reaching a blank string. * ompi_fortran_argv_count_f2c(): parse a Fortran array of strings out and stop when "count" number of strings have been parsed. Signed-off-by: Jeff Squyres <jsquyres@cisco.com> (cherry picked from commit open-mpi/ompi@0ab6b20)
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Apr 5, 2018
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MPI defines the "argv" param to Fortran MPI_COMM_SPAWN as being
terminated by a blank string. While not precisely defined (except
through a non-binding example, Example 10.2, MPI-3.1 p382:6-29), one
can infer that the "array_of_argv" param to Fortran
MPI_COMM_SPAWN_MULTIPLE is also a set of argv, each of which are
terminated by a blank line.
The "array_of_commands" argument to Fortran MPI_COMM_SPAWN_MULTIPLE is
a little less well-defined. It is assumed to be of length "count"
(another parameter to MPI_COMM_SPAWN_MULTIPLE) -- and not be
terminated by a blank string. This is also given credence by the same
example 10.2 in MPI-3.1.
The previous code assumed that "array_of_commands" should also be
terminated by a blank line -- but per the above, this is incorrect.
Instead, we should just parse our "count" number of strings from
"array_of_commands" and not look for a blank line termination.
This commit separates these two cases:
and stop when reaching a blank string.
and stop when "count" number of strings have been parsed.
Signed-off-by: Jeff Squyres jsquyres@cisco.com
(cherry picked from commit 0ab6b20)