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! -*- f90 -*-
!
! Copyright (c) 2009-2013 Cisco Systems, Inc. All rights reserved.
! Copyright (c) 2009-2012 Los Alamos National Security, LLC.
! All rights reserved.
! $COPYRIGHT$
#include "ompi/mpi/fortran/configure-fortran-output.h"
subroutine MPI_Alltoallw_f08(sendbuf,sendcounts,sdispls,sendtypes,&
recvbuf,recvcounts,rdispls,recvtypes,comm,ierror)
use :: mpi_f08_types, only : MPI_Datatype, MPI_Comm
use :: mpi_f08, only : ompi_alltoallw_f
implicit none
OMPI_FORTRAN_IGNORE_TKR_TYPE, INTENT(IN) :: sendbuf
OMPI_FORTRAN_IGNORE_TKR_TYPE :: recvbuf
INTEGER, INTENT(IN) :: sendcounts(*), sdispls(*), recvcounts(*), rdispls(*)
TYPE(MPI_Datatype), INTENT(IN) :: sendtypes(*)
TYPE(MPI_Datatype), INTENT(IN) :: recvtypes(*)
TYPE(MPI_Comm), INTENT(IN) :: comm
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
integer :: c_ierror
! Note that we pass a scalar here for both the sendtypes and
! recvtypes arguments, even though the real Alltoallw function
! expects an array of integers. This is a hack: we know that
! [send|recv]types(1)%MPI_VAL will pass the address of the first
! integer in the array of Type(MPI_Datatype) derived types. And
! since Type(MPI_Datatype) are exactly memory-equivalent to a
! single INTEGER, passing the address of the first one is the same
! as passing the address to an array of integers. To be clear: the
! back-end ompi_alltoallw_f is expecting a pointer to an array of
! integers. So it all works out (but is a hack :-\ ).
call ompi_alltoallw_f(sendbuf,sendcounts,sdispls,sendtypes(1)%MPI_VAL,&
recvbuf,recvcounts,rdispls,recvtypes(1)%MPI_VAL,comm%MPI_VAL,c_ierror)
if (present(ierror)) ierror = c_ierror
end subroutine MPI_Alltoallw_f08
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