text: /*
   * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
   *                         University Research and Technology
   *                         Corporation.  All rights reserved.
   * Copyright (c) 2004-2005 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.
   * $COPYRIGHT$
   * 
   * Additional copyrights may follow
   * 
   * $HEADER$
   */
  
  #include "ompi_config.h"
  #include <stdio.h>
  
  #include "ompi/mpi/c/bindings.h"
  #include "ompi/datatype/datatype.h"
  #include "ompi/memchecker.h"
  
  #if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
  #pragma weak MPI_Allgatherv = PMPI_Allgatherv
  #endif
  
  #if OMPI_PROFILING_DEFINES
  #include "ompi/mpi/c/profile/defines.h"
  #endif
  
  static const char FUNC_NAME[] = "MPI_Allgatherv";
  
  
  int MPI_Allgatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
                     void *recvbuf, int *recvcounts,
                     int *displs, MPI_Datatype recvtype, MPI_Comm comm) 
  {
      int i, size, err;
  
      MEMCHECKER(
          int rank;
          ptrdiff_t ext;
  
          rank = ompi_comm_rank(comm);
          size = ompi_comm_size(comm);
          ompi_ddt_type_extent(recvtype, &ext);
  
          memchecker_datatype(recvtype);
          memchecker_comm (comm);
          /* check whether the receive buffer is addressable. */
          for (i = 0; i < size; i++) {
              memchecker_call(&opal_memchecker_base_isaddressable,
                              (char *)(recvbuf)+displs[i]*ext,
                              recvcounts[i], recvtype);
          }
          
          /* check whether the actual send buffer is defined. */
          if (MPI_IN_PLACE == sendbuf) {
              memchecker_call(&opal_memchecker_base_isdefined,
                              (char *)(recvbuf)+displs[rank]*ext,
                              recvcounts[rank], recvtype);
          } else {
              memchecker_datatype(sendtype);
              memchecker_call(&opal_memchecker_base_isdefined, sendbuf, sendcount, sendtype);
          }
      );
  
      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)) {
              return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM, 
                                            FUNC_NAME);
          } else if (MPI_IN_PLACE == recvbuf) {
              return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
          }
  
          if (MPI_IN_PLACE != sendbuf) {
              OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
          }
          OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
  
          size = ompi_comm_size(comm);
          for (i = 0; i < size; ++i) {
            if (recvcounts[i] < 0) {
              return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_COUNT, FUNC_NAME);
            } else if (MPI_DATATYPE_NULL == recvtype) {
              return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_TYPE, FUNC_NAME);
            }
          }
            
          if (NULL == displs) {
            return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_BUFFER, FUNC_NAME);
          }
      }
  
      /* Do we need to do anything?  Everyone had to give the same 
         signature, which means that everyone must have given a
         sum(recvounts) > 0 if there's anything to do. */
  
      for (i = 0; i < ompi_comm_size(comm); ++i) {
          if (0 != recvcounts[i]) {
              break;
          }
      }
      if (i >= ompi_comm_size(comm)) {
          return MPI_SUCCESS;
      }
  
      OPAL_CR_ENTER_LIBRARY();
  
      /* Invoke the coll component to perform the back-end operation */
  
      err = comm->c_coll.coll_allgatherv(sendbuf, sendcount, sendtype, 
                                         recvbuf, recvcounts, 
                                         displs, recvtype, comm,
                                         comm->c_coll.coll_allgatherv_module);
      OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
  }
  
  