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) 2004-2018 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) 2006      Cisco Systems, Inc.  All rights reserved.
   * Copyright (c) 2013      Los Alamos National Security, LLC.  All rights
   *                         reserved.
   * Copyright (c) 2015-2019 Research Organization for Information Science
   *                         and Technology (RIST).  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/op/op.h"
  #include "ompi/mca/coll/base/coll_base_util.h"
  #include "ompi/memchecker.h"
  #include "ompi/mpiext/pcollreq/c/mpiext_pcollreq_c.h"
  #include "ompi/runtime/ompi_spc.h"
  
  #if OMPI_BUILD_MPI_PROFILING
  #if OPAL_HAVE_WEAK_SYMBOLS
  #pragma weak MPIX_Scan_init = PMPIX_Scan_init
  #endif
  #define MPIX_Scan_init PMPIX_Scan_init
  #endif
  
  static const char FUNC_NAME[] = "MPIX_Scan_init";
  
  
  int MPIX_Scan_init(const void *sendbuf, void *recvbuf, int count,
                     MPI_Datatype datatype, MPI_Op op, MPI_Comm comm,
                     MPI_Info info, MPI_Request *request)
  {
      int err;
  
      SPC_RECORD(OMPI_SPC_SCAN_INIT, 1);
  
      MEMCHECKER(
          memchecker_datatype(datatype);
          memchecker_comm(comm);
          if (MPI_IN_PLACE != sendbuf) {
              memchecker_call(&opal_memchecker_base_isdefined, sendbuf, count, datatype);
          } else {
              memchecker_call(&opal_memchecker_base_isdefined, recvbuf, count, datatype);
          }
      );
  
      if (MPI_PARAM_CHECK) {
          char *msg;
          err = MPI_SUCCESS;
          OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
          if (ompi_comm_invalid(comm)) {
              return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
                                            FUNC_NAME);
          }
  
          /* No intercommunicators allowed! (MPI does not define
             MPI_SCAN on intercommunicators) */
  
          else if (OMPI_COMM_IS_INTER(comm)) {
            err = MPI_ERR_COMM;
          }
  
          /* Unrooted operation; checks for all ranks */
  
          else if (MPI_OP_NULL == op || NULL == op) {
            err = MPI_ERR_OP;
          } else if (MPI_IN_PLACE == recvbuf) {
            err = MPI_ERR_ARG;
          } else if (!ompi_op_is_valid(op, datatype, &msg, FUNC_NAME)) {
              int ret = OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_OP, msg);
              free(msg);
              return ret;
          } else {
            OMPI_CHECK_DATATYPE_FOR_SEND(err, datatype, count);
          }
          OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
      }
  
      OPAL_CR_ENTER_LIBRARY();
  
      /* Call the coll component to actually perform the allgather */
  
      err = comm->c_coll->coll_scan_init(sendbuf, recvbuf, count,
                                         datatype, op, comm,
                                         info, request,
                                         comm->c_coll->coll_scan_init_module);
      if (OPAL_LIKELY(OMPI_SUCCESS == err)) {
          ompi_coll_base_retain_op(*request, op, datatype);
      }
      OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
  }
  