/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpiimpl.h"

#include "mpicomm.h"

/* -- Begin Profiling Symbol Block for routine MPI_Comm_remote_group */

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_Comm_remote_group = PMPI_Comm_remote_group

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_Comm_remote_group  MPI_Comm_remote_group

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_Comm_remote_group as PMPI_Comm_remote_group

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_Comm_remote_group(MPI_Comm comm, MPI_Group * group)

    __attribute__ ((weak, alias("PMPI_Comm_remote_group")));

#endif

/* -- End Profiling Symbol Block */

/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build

   the MPI routines */

#ifndef MPICH_MPI_FROM_PMPI

#undef MPI_Comm_remote_group

#define MPI_Comm_remote_group PMPI_Comm_remote_group

#undef FUNCNAME

#define FUNCNAME MPIR_Comm_remote_group_impl

#undef FCNAME

#define FCNAME MPL_QUOTE(FUNCNAME)

int MPIR_Comm_remote_group_impl(MPIR_Comm * comm_ptr, MPIR_Group ** group_ptr)

{

    int mpi_errno = MPI_SUCCESS;

    int i, lpid, n;

    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPIR_COMM_REMOTE_GROUP_IMPL);

    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPIR_COMM_REMOTE_GROUP_IMPL);

    /* Create a group and populate it with the local process ids */

    if (!comm_ptr->remote_group) {

        n = comm_ptr->remote_size;

        mpi_errno = MPIR_Group_create(n, group_ptr);

        if (mpi_errno)

            MPIR_ERR_POP(mpi_errno);

        for (i = 0; i < n; i++) {

            (void) MPID_Comm_get_lpid(comm_ptr, i, &lpid, TRUE);

            (*group_ptr)->lrank_to_lpid[i].lpid = lpid;

            /* TODO calculate is_local_dense_monotonic */

        }

        (*group_ptr)->size = n;

        (*group_ptr)->rank = MPI_UNDEFINED;

        (*group_ptr)->idx_of_first_lpid = -1;

        comm_ptr->remote_group = *group_ptr;

    } else {

        *group_ptr = comm_ptr->remote_group;

    }

    MPIR_Group_add_ref(comm_ptr->remote_group);

  fn_exit:

    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPIR_COMM_REMOTE_GROUP_IMPL);

    return mpi_errno;

  fn_fail:

    goto fn_exit;

}

#endif

#undef FUNCNAME

#define FUNCNAME MPI_Comm_remote_group

#undef FCNAME

#define FCNAME MPL_QUOTE(FUNCNAME)

/*@

MPI_Comm_remote_group - Accesses the remote group associated with

                        the given inter-communicator

Input Parameters:

. comm - Communicator (must be an intercommunicator) (handle)

Output Parameters:

. group - remote group of communicator (handle)

Notes:

The user is responsible for freeing the group when it is no longer needed.

.N ThreadSafe

.N Fortran

.N Errors

.N MPI_SUCCESS

.N MPI_ERR_COMM

.seealso MPI_Group_free

@*/

int MPI_Comm_remote_group(MPI_Comm comm, MPI_Group * group)

{

    int mpi_errno = MPI_SUCCESS;

    MPIR_Comm *comm_ptr = NULL;

    MPIR_Group *group_ptr;

    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_COMM_REMOTE_GROUP);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_COMM_REMOTE_GROUP);

    /* Validate parameters, especially handles needing to be converted */

#ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            MPIR_ERRTEST_COMM(comm, mpi_errno);

        }

        MPID_END_ERROR_CHECKS;

    }

#endif /* HAVE_ERROR_CHECKING */

    /* Convert MPI object handles to object pointers */

    MPIR_Comm_get_ptr(comm, comm_ptr);

    /* Validate parameters and objects (post conversion) */

#ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            /* Validate comm_ptr */

            MPIR_Comm_valid_ptr(comm_ptr, mpi_errno, TRUE);

            /* If comm_ptr is not valid, it will be reset to null */

            if (comm_ptr && comm_ptr->comm_kind != MPIR_COMM_KIND__INTERCOMM) {

                mpi_errno = MPIR_Err_create_code(MPI_SUCCESS,

                                                 MPIR_ERR_RECOVERABLE, FCNAME, __LINE__,

                                                 MPI_ERR_COMM, "**commnotinter", 0);

            }

            if (mpi_errno)

                goto fn_fail;

        }

        MPID_END_ERROR_CHECKS;

    }

#endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ...  */

    mpi_errno = MPIR_Comm_remote_group_impl(comm_ptr, &group_ptr);

    if (mpi_errno)

        MPIR_ERR_POP(mpi_errno);

    *group = group_ptr->handle;

    /* ... end of body of routine ... */

  fn_exit:

    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_COMM_REMOTE_GROUP);

    MPID_THREAD_CS_EXIT(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    return mpi_errno;

  fn_fail:

    /* --BEGIN ERROR HANDLING-- */

#ifdef HAVE_ERROR_CHECKING

    {

        mpi_errno =

            MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER,

                                 "**mpi_comm_remote_group", "**mpi_comm_remote_group %C %p", comm,

                                 group);

    }

#endif

    mpi_errno = MPIR_Err_return_comm(comm_ptr, FCNAME, mpi_errno);

    goto fn_exit;

    /* --END ERROR HANDLING-- */

}