malloc/malloc.h

   1 /* Prototypes and definition for malloc implementation.
   2    Copyright (C) 1996,97,99,2000,2002,2003,2004 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _MALLOC_H
  21 #define _MALLOC_H 1
  22
  23 #include <features.h>
  24
  25 /*
  26   $Id$
  27   `ptmalloc2', a malloc implementation for multiple threads without
  28   lock contention, by Wolfram Gloger <wg@malloc.de>.
  29
  30   VERSION 2.7.0
  31
  32   This work is mainly derived from malloc-2.7.0 by Doug Lea
  33   <dl@cs.oswego.edu>, which is available from:
  34
  35                  ftp://gee.cs.oswego.edu/pub/misc/malloc.c
  36
  37   This trimmed-down header file only provides function prototypes and
  38   the exported data structures.  For more detailed function
  39   descriptions and compile-time options, see the source file
  40   `malloc.c'.
  41 */
  42
  43 #if defined(__STDC__) || defined (__cplusplus)
  44 # include <stddef.h>
  45 # define __malloc_ptr_t  void *
  46 #else
  47 # undef  size_t
  48 # define size_t          unsigned int
  49 # undef  ptrdiff_t
  50 # define ptrdiff_t       int
  51 # define __malloc_ptr_t  char *
  52 #endif
  53
  54 #ifdef _LIBC
  55 /* Used by GNU libc internals. */
  56 # define __malloc_size_t size_t
  57 # define __malloc_ptrdiff_t ptrdiff_t
  58 #elif !defined __attribute_malloc__
  59 # define __attribute_malloc__
  60 #endif
  61
  62 #ifdef __GNUC__
  63
  64 /* GCC can always grok prototypes.  For C++ programs we add throw()
  65    to help it optimize the function calls.  But this works only with
  66    gcc 2.8.x and egcs.  */
  67 # ifndef __THROW
  68 #  if defined __cplusplus && (__GNUC__ >= 3 || __GNUC_MINOR__ >= 8)
  69 #   define __THROW      throw ()
  70 #  else
  71 #   define __THROW
  72 #  endif
  73 # endif
  74 # define __MALLOC_P(args)       args __THROW
  75 /* This macro will be used for functions which might take C++ callback
  76    functions.  */
  77 # define __MALLOC_PMT(args)     args
  78
  79 #else   /* Not GCC.  */
  80
  81 # define __THROW
  82
  83 # if (defined __STDC__ && __STDC__) || defined __cplusplus
  84
  85 #  define __MALLOC_P(args)      args
  86 #  define __MALLOC_PMT(args)    args
  87
  88 #  ifndef __const
  89 #   define __const       const
  90 #  endif
  91
  92 # else  /* Not ANSI C or C++.  */
  93
  94 #  define __MALLOC_P(args)      ()      /* No prototypes.  */
  95 #  define __MALLOC_PMT(args)    ()
  96
  97 #  ifndef __const
  98 #   define __const
  99 #  endif
 100
 101 # endif /* ANSI C or C++.  */
 102
 103 #endif  /* GCC.  */
 104
 105 #ifndef NULL
 106 # ifdef __cplusplus
 107 #  define NULL  0
 108 # else
 109 #  define NULL  ((__malloc_ptr_t) 0)
 110 # endif
 111 #endif
 112
 113 #ifdef __cplusplus
 114 extern "C" {
 115 #endif
 116
 117 /* Allocate SIZE bytes of memory.  */
 118 extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
 119
 120 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
 121 extern __malloc_ptr_t calloc __MALLOC_P ((size_t __nmemb, size_t __size))
 122        __attribute_malloc__;
 123
 124 /* Re-allocate the previously allocated block in __ptr, making the new
 125    block SIZE bytes long.  */
 126 extern __malloc_ptr_t realloc __MALLOC_P ((__malloc_ptr_t __ptr,
 127                                            size_t __size))
 128        __attribute_malloc__;
 129
 130 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 131 extern void free __MALLOC_P ((__malloc_ptr_t __ptr));
 132
 133 /* Free a block allocated by `calloc'. */
 134 extern void cfree __MALLOC_P ((__malloc_ptr_t __ptr));
 135
 136 /* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
 137 extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));
 138
 139 /* Allocate SIZE bytes on a page boundary.  */
 140 extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
 141
 142 /* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
 143    __size to nearest pagesize. */
 144 extern __malloc_ptr_t  pvalloc __MALLOC_P ((size_t __size))
 145        __attribute_malloc__;
 146
 147 /* Underlying allocation function; successive calls should return
 148    contiguous pieces of memory.  */
 149 extern __malloc_ptr_t (*__morecore) __MALLOC_PMT ((ptrdiff_t __size));
 150
 151 /* Default value of `__morecore'.  */
 152 extern __malloc_ptr_t __default_morecore __MALLOC_P ((ptrdiff_t __size))
 153        __attribute_malloc__;
 154
 155 /* SVID2/XPG mallinfo structure */
 156
 157 struct mallinfo {
 158   int arena;    /* non-mmapped space allocated from system */
 159   int ordblks;  /* number of free chunks */
 160   int smblks;   /* number of fastbin blocks */
 161   int hblks;    /* number of mmapped regions */
 162   int hblkhd;   /* space in mmapped regions */
 163   int usmblks;  /* maximum total allocated space */
 164   int fsmblks;  /* space available in freed fastbin blocks */
 165   int uordblks; /* total allocated space */
 166   int fordblks; /* total free space */
 167   int keepcost; /* top-most, releasable (via malloc_trim) space */
 168 };
 169
 170 /* Returns a copy of the updated current mallinfo. */
 171 extern struct mallinfo mallinfo __MALLOC_P ((void));
 172
 173 /* SVID2/XPG mallopt options */
 174 #ifndef M_MXFAST
 175 # define M_MXFAST  1    /* maximum request size for "fastbins" */
 176 #endif
 177 #ifndef M_NLBLKS
 178 # define M_NLBLKS  2    /* UNUSED in this malloc */
 179 #endif
 180 #ifndef M_GRAIN
 181 # define M_GRAIN   3    /* UNUSED in this malloc */
 182 #endif
 183 #ifndef M_KEEP
 184 # define M_KEEP    4    /* UNUSED in this malloc */
 185 #endif
 186
 187 /* mallopt options that actually do something */
 188 #define M_TRIM_THRESHOLD    -1
 189 #define M_TOP_PAD           -2
 190 #define M_MMAP_THRESHOLD    -3
 191 #define M_MMAP_MAX          -4
 192 #define M_CHECK_ACTION      -5
 193
 194 /* General SVID/XPG interface to tunable parameters. */
 195 extern int mallopt __MALLOC_P ((int __param, int __val));
 196
 197 /* Release all but __pad bytes of freed top-most memory back to the
 198    system. Return 1 if successful, else 0. */
 199 extern int malloc_trim __MALLOC_P ((size_t __pad));
 200
 201 /* Report the number of usable allocated bytes associated with allocated
 202    chunk __ptr. */
 203 extern size_t malloc_usable_size __MALLOC_P ((__malloc_ptr_t __ptr));
 204
 205 /* Prints brief summary statistics on stderr. */
 206 extern void malloc_stats __MALLOC_P ((void));
 207
 208 /* Record the state of all malloc variables in an opaque data structure. */
 209 extern __malloc_ptr_t malloc_get_state __MALLOC_P ((void));
 210
 211 /* Restore the state of all malloc variables from data obtained with
 212    malloc_get_state(). */
 213 extern int malloc_set_state __MALLOC_P ((__malloc_ptr_t __ptr));
 214
 215 /* Called once when malloc is initialized; redefining this variable in
 216    the application provides the preferred way to set up the hook
 217    pointers. */
 218 extern void (*__malloc_initialize_hook) __MALLOC_PMT ((void));
 219 /* Hooks for debugging and user-defined versions. */
 220 extern void (*__free_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
 221                                         __const __malloc_ptr_t));
 222 extern __malloc_ptr_t (*__malloc_hook) __MALLOC_PMT ((size_t __size,
 223                                                     __const __malloc_ptr_t));
 224 extern __malloc_ptr_t (*__realloc_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
 225                                                      size_t __size,
 226                                                      __const __malloc_ptr_t));
 227 extern __malloc_ptr_t (*__memalign_hook) __MALLOC_PMT ((size_t __alignment,
 228                                                       size_t __size,
 229                                                       __const __malloc_ptr_t));
 230 extern void (*__after_morecore_hook) __MALLOC_PMT ((void));
 231
 232 /* Activate a standard set of debugging hooks. */
 233 extern void __malloc_check_init __MALLOC_P ((void));
 234
 235
 236 #ifdef __cplusplus
 237 } /* end of extern "C" */
 238 #endif
 239
 240 #endif /* malloc.h */