source: trunk/src/3rdparty/ptmalloc/malloc-private.h@ 116

/*
  $Id: malloc-private.h,v 1.4 2006/03/31 12:56:52 wg Exp $
  Private header file for ptmalloc3, created by Wolfram Gloger
  and released to the public domain, as explained at
  http://creativecommons.org/licenses/publicdomain. 
*/

/* The following file is replicated from malloc.c */

#ifndef MALLOC_PRIVATE_H
#define MALLOC_PRIVATE_H

#ifndef MALLOC_ALIGNMENT
# define MALLOC_ALIGNMENT  ((size_t)8U)
#endif
#ifndef USE_LOCKS
# define USE_LOCKS 0
#endif

/* The bit mask value corresponding to MALLOC_ALIGNMENT */
#define CHUNK_ALIGN_MASK    (MALLOC_ALIGNMENT - SIZE_T_ONE)

/* the number of bytes to offset an address to align it */
#define align_offset(A)\
 ((((size_t)(A) & CHUNK_ALIGN_MASK) == 0)? 0 :\
  ((MALLOC_ALIGNMENT - ((size_t)(A) & CHUNK_ALIGN_MASK)) & CHUNK_ALIGN_MASK))

#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
#define MAP_ANONYMOUS        MAP_ANON
#endif /* MAP_ANON */
#ifdef MAP_ANONYMOUS
#define MMAP_FLAGS        (MAP_PRIVATE|MAP_ANONYMOUS)
#define CALL_MMAP(s)      mmap(0, (s), PROT_READ|PROT_WRITE, MMAP_FLAGS, -1, 0)
#else /* MAP_ANONYMOUS */
/*
   Nearly all versions of mmap support MAP_ANONYMOUS, so the following
   is unlikely to be needed, but is supplied just in case.
*/
#include <fcntl.h> /* for O_RDWR */
#define MMAP_FLAGS           (MAP_PRIVATE)
static int dev_zero_fd = -1; /* Cached file descriptor for /dev/zero. */
#define CALL_MMAP(s) ((dev_zero_fd < 0) ? \
           (dev_zero_fd = open("/dev/zero", O_RDWR), \
            mmap(0, (s), PROT_READ|PROT_WRITE, MMAP_FLAGS, dev_zero_fd, 0)) : \
            mmap(0, (s), PROT_READ|PROT_WRITE, MMAP_FLAGS, dev_zero_fd, 0))
#endif /* MAP_ANONYMOUS */
#define CALL_MUNMAP(a, s) munmap((a), (s))

struct malloc_chunk {
  size_t               prev_foot;  /* Size of previous chunk (if free).  */
  size_t               head;       /* Size and inuse bits. */
  struct malloc_chunk* fd;         /* double links -- used only if free. */
  struct malloc_chunk* bk;
};

typedef struct malloc_chunk  mchunk;
typedef struct malloc_chunk* mchunkptr;

typedef unsigned int binmap_t;
typedef unsigned int flag_t;

struct malloc_tree_chunk;
typedef struct malloc_tree_chunk* tbinptr;

struct malloc_segment {
  char*        base;             /* base address */
  size_t       size;             /* allocated size */
  struct malloc_segment* next;   /* ptr to next segment */
  flag_t       sflags;           /* mmap and extern flag */
};

typedef struct malloc_segment  msegment;

#define NSMALLBINS        (32U)
#define NTREEBINS         (32U)

struct malloc_state {
  binmap_t   smallmap;
  binmap_t   treemap;
  size_t     dvsize;
  size_t     topsize;
  char*      least_addr;
  mchunkptr  dv;
  mchunkptr  top;
  size_t     trim_check;
  size_t     release_checks;
  size_t     magic;
  mchunkptr  smallbins[(NSMALLBINS+1)*2];
  tbinptr    treebins[NTREEBINS];
  size_t     footprint;