/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2007 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) 2009      Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2012      Los Alamos National Security, LLC.
 *                         All rights reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */
/**
 * @file
 */
#include "ompi_config.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "opal/util/show_help.h"
#include "ompi/mca/rte/rte.h"
#include "ompi/runtime/mpiruntime.h"

#include "ompi/mca/mpool/base/mpool_base_mem_cb.h"
#include "ompi/mca/mpool/base/base.h"

#include "opal/mca/mca.h"
#include "opal/memoryhooks/memory.h"

static char msg[512];


/*
 *  memory hook callback, called when memory is free'd out from under
 *  us.  Be wary of the from_alloc flag -- if you're called with
 *  from_alloc==true, then you cannot call malloc (or any of its
 *  friends)!
 */
void mca_mpool_base_mem_cb(void* base, size_t size, void* cbdata, 
                           bool from_alloc)
{
    mca_mpool_base_selected_module_t* current;
    int rc;
    opal_list_item_t* item;

    /* Only do anything meaningful if we're between MPI_INIT and
       MPI_FINALIZE, and size != 0 */
    if ((from_alloc && (!ompi_mpi_initialized || ompi_mpi_finalized)) ||
        size == 0) { 
        return;
    }
          
    for(item = opal_list_get_first(&mca_mpool_base_modules);
        item != opal_list_get_end(&mca_mpool_base_modules);
        item = opal_list_get_next(item)) {
        
        current = (mca_mpool_base_selected_module_t*) item; 

        if(current->mpool_module->mpool_release_memory != NULL) {
            rc = current->mpool_module->mpool_release_memory(current->mpool_module,
                    base, size);

            if (rc != OMPI_SUCCESS) {
                if (from_alloc) {
                    int len;
                    len = snprintf(msg, sizeof(msg), "[%s:%d] Attempt to free memory that is still in use by an ongoing MPI communication (buffer %p, size %lu).  MPI job will now abort.\n",
                             ompi_process_info.nodename,
                             getpid(),
                             base, (unsigned long) size);
                    msg[sizeof(msg) - 1] = '\0';
                    write(2, msg, len);
                } else {
                    opal_show_help("help-mpool-base.txt", 
                                   "cannot deregister in-use memory", true,
                                   current->mpool_component->mpool_version.mca_component_name,
                                   ompi_process_info.nodename,
                                   base, (unsigned long) size);
                }

                /* We're in a callback from somewhere; we can't do
                   anything meaningful to pass an error back up.  :-(
                   So just exit.  Call _exit() so that we don't try to
                   call anything on the way out -- just exit!
                   (remember that we're in a callback, and state may
                   be very undefined at this point...) */
                _exit(1);
            }
        }
    }
}
