malloc/malloc.h

   1 /* Prototypes and definition for malloc implementation.
   2    Copyright (C) 1996 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _MALLOC_H
  21 #define _MALLOC_H 1
  22
  23 /*
  24   `ptmalloc', a malloc implementation for multiple threads without
  25   lock contention, by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>.
  26   See the files `ptmalloc.c' or `COPYRIGHT' for copying conditions.
  27
  28   VERSION 2.6.4-pt Wed Dec  4 00:35:54 MET 1996
  29
  30   This work is mainly derived from malloc-2.6.4 by Doug Lea
  31   <dl@cs.oswego.edu>, which is available from:
  32
  33                  ftp://g.oswego.edu/pub/misc/malloc.c
  34
  35   This trimmed-down header file only provides function prototypes and
  36   the exported data structures.  For more detailed function
  37   descriptions and compile-time options, see the source file
  38   `ptmalloc.c'.
  39 */
  40
  41 #if defined(__STDC__) || defined (__cplusplus)
  42 #include <stddef.h>
  43 #define __malloc_ptr_t  void *
  44 #else
  45 #undef  size_t
  46 #define size_t          unsigned int
  47 #undef  ptrdiff_t
  48 #define ptrdiff_t       int
  49 #define __malloc_ptr_t  char *
  50 #endif
  51
  52 #ifdef _LIBC
  53 /* Used by GNU libc internals. */
  54 #define __malloc_size_t size_t
  55 #define __malloc_ptrdiff_t ptrdiff_t
  56 #endif
  57
  58 #if defined (__STDC__) || defined (__cplusplus) || defined (__GNUC__)
  59 #define __MALLOC_P(args)        args
  60 #else
  61 #define __MALLOC_P(args)        ()
  62 #endif
  63
  64 #ifndef NULL
  65 #ifdef __cplusplus
  66 #define NULL    0
  67 #else
  68 #define NULL    ((__malloc_ptr_t) 0)
  69 #endif
  70 #endif
  71
  72 #ifdef __cplusplus
  73 extern "C" {
  74 #endif
  75
  76 /* Nonzero if the malloc is already initialized.  */
  77 extern int __malloc_initialized;
  78
  79 /* Initialize global configuration.  Not needed with GNU libc. */
  80 #ifndef __GLIBC__
  81 extern void ptmalloc_init __MALLOC_P ((void));
  82 #endif
  83
  84 /* Allocate SIZE bytes of memory.  */
  85 extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size));
  86
  87 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
  88 extern __malloc_ptr_t calloc __MALLOC_P ((size_t __nmemb, size_t __size));
  89
  90 /* Re-allocate the previously allocated block in __ptr, making the new
  91    block SIZE bytes long.  */
  92 extern __malloc_ptr_t realloc __MALLOC_P ((__malloc_ptr_t __ptr, size_t __size));
  93
  94 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
  95 extern void free __MALLOC_P ((__malloc_ptr_t __ptr));
  96
  97 /* Free a block allocated by `calloc'. */
  98 extern void cfree __MALLOC_P ((__malloc_ptr_t __ptr));
  99
 100 /* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
 101 extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));
 102
 103 /* Allocate SIZE bytes on a page boundary.  */
 104 extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size));
 105
 106 /* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
 107    __size to nearest pagesize. */
 108 extern __malloc_ptr_t  pvalloc __MALLOC_P ((size_t __size));
 109
 110 /* Underlying allocation function; successive calls should return
 111    contiguous pieces of memory.  */
 112 extern __malloc_ptr_t (*__morecore) __MALLOC_P ((ptrdiff_t __size));
 113
 114 /* Default value of `__morecore'.  */
 115 extern __malloc_ptr_t __default_morecore __MALLOC_P ((ptrdiff_t __size));
 116
 117 /* SVID2/XPG mallinfo structure */
 118 struct mallinfo {
 119   int arena;    /* total space allocated from system */
 120   int ordblks;  /* number of non-inuse chunks */
 121   int smblks;   /* unused -- always zero */
 122   int hblks;    /* number of mmapped regions */
 123   int hblkhd;   /* total space in mmapped regions */
 124   int usmblks;  /* unused -- always zero */
 125   int fsmblks;  /* unused -- always zero */
 126   int uordblks; /* total allocated space */
 127   int fordblks; /* total non-inuse space */
 128   int keepcost; /* top-most, releasable (via malloc_trim) space */
 129 };
 130
 131 /* Returns a copy of the updated current mallinfo. */
 132 extern struct mallinfo mallinfo __MALLOC_P ((void));
 133
 134 /* SVID2/XPG mallopt options */
 135 #ifndef M_MXFAST
 136 #define M_MXFAST  1    /* UNUSED in this malloc */
 137 #endif
 138 #ifndef M_NLBLKS
 139 #define M_NLBLKS  2    /* UNUSED in this malloc */
 140 #endif
 141 #ifndef M_GRAIN
 142 #define M_GRAIN   3    /* UNUSED in this malloc */
 143 #endif
 144 #ifndef M_KEEP
 145 #define M_KEEP    4    /* UNUSED in this malloc */
 146 #endif
 147
 148 /* mallopt options that actually do something */
 149 #define M_TRIM_THRESHOLD    -1
 150 #define M_TOP_PAD           -2
 151 #define M_MMAP_THRESHOLD    -3
 152 #define M_MMAP_MAX          -4
 153 #define M_CHECK_ACTION      -5
 154
 155 /* General SVID/XPG interface to tunable parameters. */
 156 extern int mallopt __MALLOC_P ((int __param, int __val));
 157
 158 /* Release all but __pad bytes of freed top-most memory back to the
 159    system. Return 1 if successful, else 0. */
 160 extern int malloc_trim __MALLOC_P ((size_t __pad));
 161
 162 /* Report the number of usable allocated bytes associated with allocated
 163    chunk __ptr. */
 164 extern size_t malloc_usable_size __MALLOC_P ((__malloc_ptr_t __ptr));
 165
 166 /* Prints brief summary statistics on stderr. */
 167 extern void malloc_stats __MALLOC_P ((void));
 168
 169 #if defined(__GLIBC__) || defined(MALLOC_HOOKS)
 170
 171 /* Hooks for debugging versions. */
 172 extern void (*__malloc_initialize_hook) __MALLOC_P ((void));
 173 extern void (*__free_hook) __MALLOC_P ((__malloc_ptr_t __ptr));
 174 extern __malloc_ptr_t (*__malloc_hook) __MALLOC_P ((size_t __size));
 175 extern __malloc_ptr_t (*__realloc_hook) __MALLOC_P ((__malloc_ptr_t __ptr,
 176                                                      size_t __size));
 177 extern __malloc_ptr_t (*__memalign_hook) __MALLOC_P ((size_t __size,
 178                                                       size_t __alignment));
 179
 180 /* Activate a standard set of debugging hooks. */
 181 extern void malloc_check_init __MALLOC_P ((void));
 182
 183 #endif
 184
 185 #ifdef __cplusplus
 186 }; /* end of extern "C" */
 187 #endif
 188
 189 #endif /* !defined(_MALLOC_H) */