/*
 * Copyright (c) 2004-2005 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 (c) 2007      Los Alamos National Security, LLC.  All rights
 *                         reserved. 
 * Copyright (c) 2006-2009 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2013      NVIDIA Corporation.  All rights reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */

#ifndef OMPI_RUNTIME_PARAMS_H
#define OMPI_RUNTIME_PARAMS_H

#include "ompi_config.h"

BEGIN_C_DECLS

/*
 * Global variables
 */

/**
 * Whether or not to check the parameters of top-level MPI API
 * functions or not.
 *
 * This variable should never be checked directly; the macro
 * MPI_PARAM_CHECK should be used instead.  This allows multiple
 * levels of MPI function parameter checking:
 *
 * #- Disable all parameter checking at configure/compile time
 * #- Enable all parameter checking at configure/compile time
 * #- Disable all parameter checking at run time
 * #- Enable all parameter checking at run time
 *
 * Hence, the MPI_PARAM_CHECK macro will either be "0", "1", or
 * "ompi_mpi_param_check".
 */
OMPI_DECLSPEC extern bool ompi_mpi_param_check;

/**
 * Whether or not to check for MPI handle leaks during MPI_FINALIZE.
 * If enabled, each MPI handle type will display a summary of the
 * handles that are still allocated during MPI_FINALIZE.
 *
 * This is good debugging for user applications to find out if they
 * are inadvertantly orphaning MPI handles.
 */
OMPI_DECLSPEC extern bool ompi_debug_show_handle_leaks;

/**
 * If > 0, show that many MPI_ALLOC_MEM leaks during MPI_FINALIZE.  If
 * enabled, memory that was returned via MPI_ALLOC_MEM but was never
 * freed via MPI_FREE_MEM will be displayed during MPI_FINALIZE.
 *
 * This is good debugging for user applications to find out if they
 * are inadvertantly orphaning MPI "special" memory.
 */
OMPI_DECLSPEC extern int ompi_debug_show_mpi_alloc_mem_leaks;

/**
 * Whether or not to actually free MPI handles when their
 * corresponding destructor is invoked.  If enabled, Open MPI will not
 * free handles, but will rather simply mark them as "freed".  Any
 * attempt to use them will result in an MPI exception.
 *
 * This is good debugging for user applications to find out if they
 * are inadvertantly using MPI handles after they have been freed.
 */
OMPI_DECLSPEC extern bool ompi_debug_no_free_handles;

/**
 * Whether or not to print MCA parameters on MPI_INIT
 *
 * This is good debugging for user applications to see exactly which 
 * MCA parameters are being used in the current program execution.
 */
OMPI_DECLSPEC extern bool ompi_mpi_show_mca_params;

/**
 * Whether or not to print the MCA parameters to a file or to stdout
 *
 * If this argument is set then it is used when parameters are dumped
 * when the mpi_show_mca_params is set.
 */
OMPI_DECLSPEC extern char * ompi_mpi_show_mca_params_file;

/**
 * Whether we should keep the string hostnames of all the MPI
 * process peers around or not (eats up a good bit of memory).
 */
OMPI_DECLSPEC extern bool ompi_mpi_keep_peer_hostnames;

/**
 * Whether an MPI_ABORT should print out a stack trace or not.
 */
OMPI_DECLSPEC extern bool ompi_mpi_abort_print_stack;

/**
 * Whether  MPI_ABORT  should  print  out an  identifying  message
 * (e.g., hostname  and PID)  and loop waiting  for a  debugger to
 * attach.  The value of the integer is how many seconds to wait:
 *
 * 0 = do not print the message and do not loop
 * negative value = print the message and loop forever
 * positive value = print the message and delay for that many seconds
 */
OMPI_DECLSPEC extern int ompi_mpi_abort_delay;

/**
 * Whether to use the "leave pinned" protocol or not (0 = no, 1 = yes,
 * -1 = determine at runtime).
 */
OMPI_DECLSPEC extern int ompi_mpi_leave_pinned;

/**
 * Whether to use the "leave pinned pipeline" protocol or not.
 */
OMPI_DECLSPEC extern bool ompi_mpi_leave_pinned_pipeline;

/**
 * Whether sparse MPI group storage formats are supported or not.
 */
OMPI_DECLSPEC extern bool ompi_have_sparse_group_storage;

/**
 * Whether sparse MPI group storage formats should be used or not.
 */
OMPI_DECLSPEC extern bool ompi_use_sparse_group_storage;

/**
 * Whether we want to enable CUDA GPU buffer send and receive support.
 */
OMPI_DECLSPEC extern bool ompi_mpi_cuda_support;

/**
 * Register MCA parameters used by the MPI layer.
 *
 * @returns OMPI_SUCCESS
 *
 * Registers several MCA parameters and initializes corresponding
 * global variables to the values obtained from the MCA system.
 */
OMPI_DECLSPEC int ompi_mpi_register_params(void);

/**
 * Display all MCA parameters used 
 * 
 * @returns OMPI_SUCCESS
 *
 * Displays in key = value format
 */
int ompi_show_all_mca_params(int32_t, int, char *);

END_C_DECLS

#endif /* OMPI_RUNTIME_PARAMS_H */