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) 2004-2006 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) 2007-2015 Cisco Systems, Inc.  All rights reserved.
   * Copyright (c) 2007-2008 Sun Microsystems, Inc.  All rights reserved.
   * Copyright (c) 2015      Research Organization for Information Science
   *                         and Technology (RIST). All rights reserved.
   * $COPYRIGHT$
   *
   * Additional copyrights may follow
   *
   * $HEADER$
   */
  
  #include "ompi_config.h"
  
  #include <stdlib.h>
  
  #include "opal/util/show_help.h"
  #include "ompi/mpi/c/bindings.h"
  #include "ompi/communicator/communicator.h"
  #include "ompi/errhandler/errhandler.h"
  #include "ompi/constants.h"
  
  #if OMPI_BUILD_MPI_PROFILING
  #if OPAL_HAVE_WEAK_SYMBOLS
  #pragma weak MPI_Init = PMPI_Init
  #endif
  #define MPI_Init PMPI_Init
  #endif
  
  static const char FUNC_NAME[] = "MPI_Init";
  
  
  int MPI_Init(int *argc, char ***argv)
  {
      int err;
      int provided;
      char *env;
      int required = MPI_THREAD_SINGLE;
  
      /* check for environment overrides for required thread level.  If
         there is, check to see that it is a valid/supported thread level.
         If not, default to MPI_THREAD_MULTIPLE. */
  
      if (NULL != (env = getenv("OMPI_MPI_THREAD_LEVEL"))) {
          required = atoi(env);
          if (required < MPI_THREAD_SINGLE || required > MPI_THREAD_MULTIPLE) {
              required = MPI_THREAD_MULTIPLE;
          }
      }
  
      /* Call the back-end initialization function (we need to put as
         little in this function as possible so that if it's profiled, we
         don't lose anything) */
  
      if (NULL != argc && NULL != argv) {
          err = ompi_mpi_init(*argc, *argv, required, &provided);
      } else {
          err = ompi_mpi_init(0, NULL, required, &provided);
      }
  
      /* Since we don't have a communicator to invoke an errorhandler on
         here, don't use the fancy-schmancy ERRHANDLER macros; they're
         really designed for real communicator objects.  Just use the
         back-end function directly. */
  
      if (MPI_SUCCESS != err) {
          return ompi_errhandler_invoke(NULL, NULL,
                                        OMPI_ERRHANDLER_TYPE_COMM,
                                        err <
                                        0 ? ompi_errcode_get_mpi_code(err) :
                                        err, FUNC_NAME);
      }
  
      return MPI_SUCCESS;
  }
  