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 #ifdef _LIBC
  24 #include <features.h>
  25 #endif
  26
  27 /*
  28   $Id$
  29   `ptmalloc2', a malloc implementation for multiple threads without
  30   lock contention, by Wolfram Gloger <wg@malloc.de>.
  31
  32   VERSION 2.7.0
  33
  34   This work is mainly derived from malloc-2.7.0 by Doug Lea
  35   <dl@cs.oswego.edu>, which is available from:
  36
  37                  ftp://gee.cs.oswego.edu/pub/misc/malloc.c
  38
  39   This trimmed-down header file only provides function prototypes and
  40   the exported data structures.  For more detailed function
  41   descriptions and compile-time options, see the source file
  42   `malloc.c'.
  43 */
  44
  45 #if defined(__STDC__) || defined (__cplusplus)
  46 # include <stddef.h>
  47 # define __malloc_ptr_t  void *
  48 #else
  49 # undef  size_t
  50 # define size_t          unsigned int
  51 # undef  ptrdiff_t
  52 # define ptrdiff_t       int
  53 # define __malloc_ptr_t  char *
  54 #endif
  55
  56 #ifdef _LIBC
  57 /* Used by GNU libc internals. */
  58 # define __malloc_size_t size_t
  59 # define __malloc_ptrdiff_t ptrdiff_t
  60 #elif !defined __attribute_malloc__
  61 # define __attribute_malloc__
  62 #endif
  63
  64 #ifdef __GNUC__
  65
  66 /* GCC can always grok prototypes.  For C++ programs we add throw()
  67    to help it optimize the function calls.  But this works only with
  68    gcc 2.8.x and egcs.  */
  69 # ifndef __THROW
  70 #  if defined __cplusplus && (__GNUC__ >= 3 || __GNUC_MINOR__ >= 8)
  71 #   define __THROW      throw ()
  72 #  else
  73 #   define __THROW
  74 #  endif
  75 # endif
  76 # define __MALLOC_P(args)       args __THROW
  77 /* This macro will be used for functions which might take C++ callback
  78    functions.  */
  79 # define __MALLOC_PMT(args)     args
  80
  81 #else   /* Not GCC.  */
  82
  83 # define __THROW
  84
  85 # if (defined __STDC__ && __STDC__) || defined __cplusplus
  86
  87 #  define __MALLOC_P(args)      args
  88 #  define __MALLOC_PMT(args)    args
  89
  90 #  ifndef __const
  91 #   define __const       const
  92 #  endif
  93
  94 # else  /* Not ANSI C or C++.  */
  95
  96 #  define __MALLOC_P(args)      ()      /* No prototypes.  */
  97 #  define __MALLOC_PMT(args)    ()
  98
  99 #  ifndef __const
 100 #   define __const
 101 #  endif
 102
 103 # endif /* ANSI C or C++.  */
 104
 105 #endif  /* GCC.  */
 106
 107 #ifndef NULL
 108 # ifdef __cplusplus
 109 #  define NULL  0
 110 # else
 111 #  define NULL  ((__malloc_ptr_t) 0)
 112 # endif
 113 #endif
 114
 115 #ifdef __cplusplus
 116 extern "C" {
 117 #endif
 118
 119 /* Allocate SIZE bytes of memory.  */
 120 extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
 121
 122 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
 123 extern __malloc_ptr_t calloc __MALLOC_P ((size_t __nmemb, size_t __size))
 124        __attribute_malloc__;
 125
 126 /* Re-allocate the previously allocated block in __ptr, making the new
 127    block SIZE bytes long.  */
 128 extern __malloc_ptr_t realloc __MALLOC_P ((__malloc_ptr_t __ptr,
 129                                            size_t __size))
 130        __attribute_malloc__;
 131
 132 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 133 extern void free __MALLOC_P ((__malloc_ptr_t __ptr));
 134
 135 /* Free a block allocated by `calloc'. */
 136 extern void cfree __MALLOC_P ((__malloc_ptr_t __ptr));
 137
 138 /* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
 139 extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));
 140
 141 /* Allocate SIZE bytes on a page boundary.  */
 142 extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
 143
 144 /* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
 145    __size to nearest pagesize. */
 146 extern __malloc_ptr_t  pvalloc __MALLOC_P ((size_t __size))
 147        __attribute_malloc__;
 148
 149 /* Underlying allocation function; successive calls should return
 150    contiguous pieces of memory.  */
 151 extern __malloc_ptr_t (*__morecore) __MALLOC_PMT ((ptrdiff_t __size));
 152
 153 /* Default value of `__morecore'.  */
 154 extern __malloc_ptr_t __default_morecore __MALLOC_P ((ptrdiff_t __size))
 155        __attribute_malloc__;
 156
 157 /* SVID2/XPG mallinfo structure */
 158
 159 struct mallinfo {
 160   int arena;    /* non-mmapped space allocated from system */
 161   int ordblks;  /* number of free chunks */
 162   int smblks;   /* number of fastbin blocks */
 163   int hblks;    /* number of mmapped regions */
 164   int hblkhd;   /* space in mmapped regions */
 165   int usmblks;  /* maximum total allocated space */
 166   int fsmblks;  /* space available in freed fastbin blocks */
 167   int uordblks; /* total allocated space */
 168   int fordblks; /* total free space */
 169   int keepcost; /* top-most, releasable (via malloc_trim) space */
 170 };
 171
 172 /* Returns a copy of the updated current mallinfo. */
 173 extern struct mallinfo mallinfo __MALLOC_P ((void));
 174
 175 /* SVID2/XPG mallopt options */
 176 #ifndef M_MXFAST
 177 # define M_MXFAST  1    /* maximum request size for "fastbins" */
 178 #endif
 179 #ifndef M_NLBLKS
 180 # define M_NLBLKS  2    /* UNUSED in this malloc */
 181 #endif
 182 #ifndef M_GRAIN
 183 # define M_GRAIN   3    /* UNUSED in this malloc */
 184 #endif
 185 #ifndef M_KEEP
 186 # define M_KEEP    4    /* UNUSED in this malloc */
 187 #endif
 188
 189 /* mallopt options that actually do something */
 190 #define M_TRIM_THRESHOLD    -1
 191 #define M_TOP_PAD           -2
 192 #define M_MMAP_THRESHOLD    -3
 193 #define M_MMAP_MAX          -4
 194 #define M_CHECK_ACTION      -5
 195
 196 /* General SVID/XPG interface to tunable parameters. */
 197 extern int mallopt __MALLOC_P ((int __param, int __val));
 198
 199 /* Release all but __pad bytes of freed top-most memory back to the
 200    system. Return 1 if successful, else 0. */
 201 extern int malloc_trim __MALLOC_P ((size_t __pad));
 202
 203 /* Report the number of usable allocated bytes associated with allocated
 204    chunk __ptr. */
 205 extern size_t malloc_usable_size __MALLOC_P ((__malloc_ptr_t __ptr));
 206
 207 /* Prints brief summary statistics on stderr. */
 208 extern void malloc_stats __MALLOC_P ((void));
 209
 210 /* Record the state of all malloc variables in an opaque data structure. */
 211 extern __malloc_ptr_t malloc_get_state __MALLOC_P ((void));
 212
 213 /* Restore the state of all malloc variables from data obtained with
 214    malloc_get_state(). */
 215 extern int malloc_set_state __MALLOC_P ((__malloc_ptr_t __ptr));
 216
 217 /* Called once when malloc is initialized; redefining this variable in
 218    the application provides the preferred way to set up the hook
 219    pointers. */
 220 extern void (*__malloc_initialize_hook) __MALLOC_PMT ((void));
 221 /* Hooks for debugging and user-defined versions. */
 222 extern void (*__free_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
 223                                         __const __malloc_ptr_t));
 224 extern __malloc_ptr_t (*__malloc_hook) __MALLOC_PMT ((size_t __size,
 225                                                     __const __malloc_ptr_t));
 226 extern __malloc_ptr_t (*__realloc_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
 227                                                      size_t __size,
 228                                                      __const __malloc_ptr_t));
 229 extern __malloc_ptr_t (*__memalign_hook) __MALLOC_PMT ((size_t __alignment,
 230                                                       size_t __size,
 231                                                       __const __malloc_ptr_t));
 232 extern void (*__after_morecore_hook) __MALLOC_PMT ((void));
 233
 234 /* Activate a standard set of debugging hooks. */
 235 extern void __malloc_check_init __MALLOC_P ((void));
 236
 237
 238 #ifdef __cplusplus
 239 } /* end of extern "C" */
 240 #endif
 241
 242 #endif /* malloc.h */