/* -*- 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"

#undef FUNCNAME
#define FUNCNAME MPIR_Barrier_intra_smp
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Barrier_intra_smp(MPIR_Comm * comm_ptr, MPIR_Errflag_t * errflag)
{
    int mpi_errno = MPI_SUCCESS;
    int mpi_errno_ret = MPI_SUCCESS;

    MPIR_Assert(MPIR_CVAR_ENABLE_SMP_COLLECTIVES && MPIR_CVAR_ENABLE_SMP_BARRIER &&
                MPIR_Comm_is_node_aware(comm_ptr));

    /* do the intranode barrier on all nodes */
    if (comm_ptr->node_comm != NULL) {
        mpi_errno = MPIR_Barrier(comm_ptr->node_comm, errflag);
        if (mpi_errno) {
            /* for communication errors, just record the error but continue */
            *errflag =
                MPIX_ERR_PROC_FAILED ==
                MPIR_ERR_GET_CLASS(mpi_errno) ? MPIR_ERR_PROC_FAILED : MPIR_ERR_OTHER;
            MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
            MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
        }
    }

    /* do the barrier across roots of all nodes */
    if (comm_ptr->node_roots_comm != NULL) {
        mpi_errno = MPIR_Barrier(comm_ptr->node_roots_comm, errflag);
        if (mpi_errno) {
            /* for communication errors, just record the error but continue */
            *errflag =
                MPIX_ERR_PROC_FAILED ==
                MPIR_ERR_GET_CLASS(mpi_errno) ? MPIR_ERR_PROC_FAILED : MPIR_ERR_OTHER;
            MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
            MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
        }
    }

    /* release the local processes on each node with a 1-byte
     * broadcast (0-byte broadcast just returns without doing
     * anything) */
    if (comm_ptr->node_comm != NULL) {
        int i = 0;
        mpi_errno = MPIR_Bcast(&i, 1, MPI_BYTE, 0, comm_ptr->node_comm, errflag);
        if (mpi_errno) {
            /* for communication errors, just record the error but continue */
            *errflag =
                MPIX_ERR_PROC_FAILED ==
                MPIR_ERR_GET_CLASS(mpi_errno) ? MPIR_ERR_PROC_FAILED : MPIR_ERR_OTHER;
            MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
            MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
        }
    }

    if (mpi_errno_ret)
        mpi_errno = mpi_errno_ret;
    else if (*errflag != MPIR_ERR_NONE)
        MPIR_ERR_SET(mpi_errno, *errflag, "**coll_fail");
    return mpi_errno;
}