if(NULL == (dblk = (H5HL_dblk_t *)H5AC_protect(f, dxpl_id, H5AC_LHEAP_DBLK, heap->dblk_addr, &dblk_udata, H5AC__NO_FLAGS_SET)))
 
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
 *
 * Created:     H5HL.c
 *          Jul 16 1997
 *          Robb Matzke <matzke@llnl.gov>
 *
 * Purpose:     Heap functions for the local heaps used by symbol
 *          tables to store names (among other things).
 *
 *-------------------------------------------------------------------------
 */
/****************/
/* Module Setup */
/****************/
#include "H5HLmodule.h"         /* This source code file is part of the H5HL module */
/***********/
/* Headers */
/***********/
#include "H5private.h"      /* Generic Functions            */
#include "H5Eprivate.h"     /* Error handling           */
#include "H5Fprivate.h"         /* File access              */
#include "H5HLpkg.h"        /* Local Heaps              */
#include "H5MFprivate.h"    /* File memory management       */
/****************/
/* Local Macros */
/****************/
#define H5HL_MIN_HEAP   128             /* Minimum size to reduce heap buffer to */