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/usr/include/xbt/mmalloc.h is in libsimgrid-dev 3.10-7.

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The actual contents of the file can be viewed below.

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/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
   This file was then part of the GNU C Library. */

/* Copyright (c) 2010-2013. The SimGrid Team.
 * All rights reserved.                                                     */

/* This program is free software; you can redistribute it and/or modify it
 * under the terms of the license (GNU LGPL) which comes with this package. */


#ifndef MMALLOC_H
#define MMALLOC_H 1

#ifdef HAVE_STDDEF_H
#  include <stddef.h>
#else
#  include <sys/types.h>        /* for size_t */
#  include <stdio.h>            /* for NULL */
#endif

#include "xbt/dynar.h"
#include "xbt/dict.h"

/* Datatype representing a separate heap. The whole point of the mmalloc module
 * is to allow several such heaps in the process. It thus works by redefining
 * all the classical memory management functions (malloc and friends) with an
 * extra first argument: the heap in which the memory is to be taken.
 *
 * The heap structure itself is an opaque object that shouldnt be messed with.
 */
typedef struct mdesc *xbt_mheap_t;

/* Allocate SIZE bytes of memory (and memset it to 0).  */
XBT_PUBLIC( void ) *mmalloc(xbt_mheap_t md, size_t size);

/* Allocate SIZE bytes of memory (and don't mess with it) */
void *mmalloc_no_memset(xbt_mheap_t mdp, size_t size);

/* Re-allocate the previously allocated block in void*, making the new block
   SIZE bytes long.  */
XBT_PUBLIC( void ) *mrealloc(xbt_mheap_t md, void *ptr, size_t size);

/* Free a block allocated by `mmalloc', `mrealloc' or `mcalloc'.  */
XBT_PUBLIC( void ) mfree(xbt_mheap_t md, void *ptr);

XBT_PUBLIC( xbt_mheap_t ) xbt_mheap_new(int fd, void *baseaddr);

XBT_PUBLIC( void ) xbt_mheap_destroy_no_free(xbt_mheap_t md);

XBT_PUBLIC( void ) *xbt_mheap_destroy(xbt_mheap_t md);

/* return the heap used when NULL is passed as first argument to any mm* function */
XBT_PUBLIC( xbt_mheap_t ) mmalloc_get_default_md(void);

/* To change the heap used when using the legacy version malloc/free/realloc and such */
void mmalloc_set_current_heap(xbt_mheap_t new_heap);
xbt_mheap_t mmalloc_get_current_heap(void);

int mmalloc_compare_heap(xbt_mheap_t heap1, xbt_mheap_t heap2, xbt_dict_t all_types, xbt_dict_t other_types);
int mmalloc_linear_compare_heap(xbt_mheap_t heap1, xbt_mheap_t heap2);
int init_heap_information(xbt_mheap_t heap1, xbt_mheap_t heap2, xbt_dynar_t to_ignore1, xbt_dynar_t to_ignore2);
int compare_heap_area(void *area1, void* area2, xbt_dynar_t previous, xbt_dict_t all_types, xbt_dict_t other_types, char *type, int pointer_level);
void reset_heap_information(void);
int get_pointed_area_size(void *area, int heap);

size_t mmalloc_get_bytes_used(xbt_mheap_t);
ssize_t mmalloc_get_busy_size(xbt_mheap_t, void *ptr);

#endif                          /* MMALLOC_H */