text: /*
   * Copyright (c) 2004-2008 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) 2004-2005 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
   * 
   * $HEADER$
   *
   * These symbols are in a file by themselves to provide nice linker
   * semantics.  Since linkers generally pull in symbols by object
   * files, keeping these symbols as the only symbols in this file
   * prevents utility programs such as "ompi_info" from having to import
   * entire components just to query their version and parameters.
   */
  
  #include "orte_config.h"
  #include "orte/constants.h"
  
  #include "opal/mca/base/mca_base_param.h"
  
  #include "orte/util/proc_info.h"
  
  #include "orte/mca/ess/ess.h"
  #include "orte/mca/ess/singleton/ess_singleton.h"
  
  extern orte_ess_base_module_t orte_ess_singleton_module;
  
  /*
   * Instantiate the public struct with all of our public information
   * and pointers to our public functions in it
   */
  orte_ess_base_component_t mca_ess_singleton_component = {
      /* First, the mca_component_t struct containing meta information
         about the component itself */
      {
          ORTE_ESS_BASE_VERSION_2_0_0,
  
          /* Component name and version */
          "singleton",
          ORTE_MAJOR_VERSION,
          ORTE_MINOR_VERSION,
          ORTE_RELEASE_VERSION,
  
          /* Component open and close functions */
          orte_ess_singleton_component_open,
          orte_ess_singleton_component_close,
          orte_ess_singleton_component_query
      },
      {
          /* The component is not checkpoint ready */
          MCA_BASE_METADATA_PARAM_NONE
      }
  };
  
  
  int
  orte_ess_singleton_component_open(void)
  {
      return ORTE_SUCCESS;
  }
  
  int orte_ess_singleton_component_query(mca_base_module_t **module, int *priority)
  {
      /* if we are an HNP, daemon, or tool, then we
       * are definitely not a singleton!
       */
      if (ORTE_PROC_IS_HNP ||
          ORTE_PROC_IS_DAEMON ||
          ORTE_PROC_IS_TOOL) {
          *module = NULL;
          return ORTE_ERROR;
      }
      
      /* okay, we still could be a singleton or
       * an application process. If we have been
       * given an HNP URI, then we are definitely
       * not a singleton
       */
      if (NULL != orte_process_info.my_hnp_uri) {
          *module = NULL;
          return ORTE_ERROR;
      }
      
      /* okay, we could still be an application process,
       * but launched in "standalone" mode - i.e., directly
       * launched by an environment instead of via mpirun.
       * We need to set our priority low so that any enviro
       * component will override us. If they don't, then we
       * want to be selected as we must be a singleton
       */
      *priority = 25;
      *module = (mca_base_module_t *)&orte_ess_singleton_module;
      return ORTE_SUCCESS;
  }
  
  
  int
  orte_ess_singleton_component_close(void)
  {
      return ORTE_SUCCESS;
  }
  
  