!   -*- Mode: Fortran; -*-
!
!   (C) 2014 by Argonne National Laboratory.
!   See COPYRIGHT in top-level directory.
!
subroutine PMPIR_Neighbor_alltoallv_f08ts(sendbuf, sendcounts, sdispls, sendtype, recvbuf, recvcounts, &
    rdispls, recvtype, comm, ierror)
    use, intrinsic :: iso_c_binding, only : c_int
    use :: mpi_f08, only : MPI_Datatype, MPI_Comm
    use :: mpi_c_interface, only : c_Datatype, c_Comm
    use :: mpi_c_interface, only : MPIR_Neighbor_alltoallv_cdesc, MPIR_Dist_graph_neighbors_count_c

    implicit none

    type(*), dimension(..), intent(in)  :: sendbuf
    type(*), dimension(..)  :: recvbuf
    integer, intent(in)  :: sendcounts(*)
    integer, intent(in)  :: sdispls(*)
    integer, intent(in)  :: recvcounts(*)
    integer, intent(in)  :: rdispls(*)
    type(MPI_Datatype), intent(in)  :: sendtype
    type(MPI_Datatype), intent(in)  :: recvtype
    type(MPI_Comm), intent(in)  :: comm
    integer, optional, intent(out)  :: ierror

    integer(c_int), allocatable :: sendcounts_c(:)
    integer(c_int), allocatable :: sdispls_c(:)
    integer(c_int), allocatable :: recvcounts_c(:)
    integer(c_int), allocatable :: rdispls_c(:)
    integer(c_Datatype) :: sendtype_c
    integer(c_Datatype) :: recvtype_c
    integer(c_Comm) :: comm_c
    integer(c_int) :: ierror_c
    integer(c_int) :: err, indegree, outdegree, weighted

    if (c_int == kind(0)) then
        ierror_c = MPIR_Neighbor_alltoallv_cdesc(sendbuf, sendcounts, sdispls, sendtype%MPI_VAL, recvbuf, recvcounts, rdispls, &
            recvtype%MPI_VAL, comm%MPI_VAL)
    else
        sendtype_c = sendtype%MPI_VAL
        recvtype_c = recvtype%MPI_VAL
        comm_c = comm%MPI_VAL
        err = MPIR_Dist_graph_neighbors_count_c(comm_c, indegree, outdegree, weighted)
        sendcounts_c = sendcounts(1:outdegree)
        sdispls_c = sdispls(1:outdegree)
        recvcounts_c = recvcounts(1:indegree)
        rdispls_c = rdispls(1:indegree)

        ierror_c = MPIR_Neighbor_alltoallv_cdesc(sendbuf, sendcounts_c, sdispls_c, sendtype_c, recvbuf, recvcounts_c, &
            rdispls_c, recvtype_c, comm_c)
    end if

    if(present(ierror)) ierror = ierror_c

end subroutine PMPIR_Neighbor_alltoallv_f08ts
