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/*
* libc/stdlib/malloc/malloc.h -- small malloc implementation
*
* Copyright (C) 2002 NEC Corporation
* Copyright (C) 2002 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*
* Written by Miles Bader <miles@gnu.org>
*/
/* The alignment we guarantee for malloc return values. */
#define MALLOC_ALIGNMENT (sizeof (double))
/* The system pagesize we assume; we really ought to get it with
getpagesize, but gee, how annoying. */
#define MALLOC_PAGE_SIZE 4096
/* The minimum size of block we request from the the system to extend the
heap for small allocations (we may request a bigger block if necessary to
satisfy a particularly big request). */
#define MALLOC_HEAP_EXTEND_SIZE MALLOC_PAGE_SIZE
/* The threshold above which blocks are allocated/freed with mmap/munmap,
rather than using the heap. */
#define MALLOC_MMAP_THRESHOLD (8*MALLOC_PAGE_SIZE)
#if 0
#include <stdio.h>
#define MALLOC_DEBUG(fmt, args...) fprintf (stderr, fmt , ##args)
#else
#define MALLOC_DEBUG(fmt, args...) (void)0
#endif
/* Return SZ rounded up to a multiple MALLOC_PAGE_SIZE. */
#define MALLOC_ROUND_UP_TO_PAGE_SIZE(sz) \
(((sz) + (MALLOC_PAGE_SIZE - 1)) & ~(MALLOC_PAGE_SIZE - 1))
/* The heap used for small allocations. */
extern struct heap __malloc_heap;
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