text: /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
  /*
   * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
   *                         University Research and Technology
   *                         Corporation.  All rights reserved.
   * Copyright (c) 2004-2017 The University of Tennessee and The University
   *                         of Tennessee Research Foundation.  All rights
   *                         reserved.
   * Copyright (c) 2004-2008 High Performance Computing Center Stuttgart,
   *                         University of Stuttgart.  All rights reserved.
   * Copyright (c) 2004-2005 The Regents of the University of California.
   *                         All rights reserved.
   * Copyright (c) 2007      Cisco Systems, Inc.  All rights reserved.
   * Copyright (c) 2012      Oak Rigde National Laboratory. All rights reserved.
   * Copyright (c) 2013      Los Alamos National Security, LLC. All rights
   *                         reserved.
   * Copyright (c) 2015-2018 Research Organization for Information Science
   *                         and Technology (RIST). All rights reserved.
   * Copyright (c) 2017      IBM Corporation.  All rights reserved.
   * $COPYRIGHT$
   *
   * Additional copyrights may follow
   *
   * $HEADER$
   */
  
  #include "ompi_config.h"
  #include <stdio.h>
  
  #include "ompi/mpi/c/bindings.h"
  #include "ompi/runtime/params.h"
  #include "ompi/communicator/communicator.h"
  #include "ompi/errhandler/errhandler.h"
  #include "ompi/datatype/ompi_datatype.h"
  #include "ompi/memchecker.h"
  #include "ompi/mca/topo/topo.h"
  #include "ompi/mca/topo/base/base.h"
  #include "ompi/runtime/ompi_spc.h"
  #include "ompi/mpiext/pcollreq/c/mpiext_pcollreq_c.h"
  
  #if OMPI_BUILD_MPI_PROFILING
  #if OPAL_HAVE_WEAK_SYMBOLS
  #pragma weak MPIX_Neighbor_allgather_init = PMPIX_Neighbor_allgather_init
  #endif
  #define MPIX_Neighbor_allgather_init PMPIX_Neighbor_allgather_init
  #endif
  
  static const char FUNC_NAME[] = "MPIX_Neighbor_allgather_init";
  
  
  int MPIX_Neighbor_allgather_init(const void *sendbuf, int sendcount, MPI_Datatype sendtype,
                              void *recvbuf, int recvcount, MPI_Datatype recvtype,
                              MPI_Comm comm, MPI_Info info, MPI_Request *request)
  {
      int err;
  
      SPC_RECORD(OMPI_SPC_NEIGHBOR_ALLGATHER_INIT, 1);
  
      MEMCHECKER(
          int rank;
          ptrdiff_t ext;
  
          rank = ompi_comm_rank(comm);
          ompi_datatype_type_extent(recvtype, &ext);
  
          memchecker_datatype(recvtype);
          memchecker_comm(comm);
          /* check whether the actual send buffer is defined. */
          if (MPI_IN_PLACE != sendbuf) {
              memchecker_datatype(sendtype);
              memchecker_call(&opal_memchecker_base_isdefined, sendbuf, sendcount, sendtype);
          }
          /* check whether the receive buffer is addressable. */
          memchecker_call(&opal_memchecker_base_isaddressable, recvbuf, recvcount, recvtype);
      );
  
      if (MPI_PARAM_CHECK) {
  
          /* Unrooted operation -- same checks for all ranks on both
             intracommunicators and intercommunicators */
  
          err = MPI_SUCCESS;
          OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
          if (ompi_comm_invalid(comm) || OMPI_COMM_IS_INTER(comm)) {
            OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM, FUNC_NAME);
          } else if (! OMPI_COMM_IS_TOPO(comm)) {
            OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_TOPOLOGY, FUNC_NAME);
          } else if (MPI_DATATYPE_NULL == recvtype || NULL == recvtype) {
            err = MPI_ERR_TYPE;
          } else if (recvcount < 0) {
            err = MPI_ERR_COUNT;
          } else if (MPI_IN_PLACE == sendbuf || MPI_IN_PLACE == recvbuf) {
            return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
          } else {
              OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
          }
          OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
  
          if( OMPI_COMM_IS_CART(comm) ) {
              const mca_topo_base_comm_cart_2_2_0_t *cart = comm->c_topo->mtc.cart;
              if( 0 > cart->ndims ) {
                  return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
              }
          }
          else if( OMPI_COMM_IS_GRAPH(comm) ) {
              int degree;
              mca_topo_base_graph_neighbors_count(comm, ompi_comm_rank(comm), &degree);
              if( 0 > degree ) {
                  return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
              }
          }
          else if( OMPI_COMM_IS_DIST_GRAPH(comm) ) {
              const mca_topo_base_comm_dist_graph_2_2_0_t *dist_graph = comm->c_topo->mtc.dist_graph;
              int indegree  = dist_graph->indegree;
              int outdegree = dist_graph->outdegree;
              if( indegree <  0 || outdegree <  0 ) {
                  return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
              }
          }
      }
  
      OPAL_CR_ENTER_LIBRARY();
  
      /* Invoke the coll component to perform the back-end operation */
      err = comm->c_coll->coll_neighbor_allgather_init(sendbuf, sendcount, sendtype, recvbuf,
                                                       recvcount, recvtype, comm, info, request,
                                                       comm->c_coll->coll_neighbor_allgather_init_module);
  
      OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
  }
  