malloc/malloc.h

   1 /* Prototypes and definition for malloc implementation.
   2    Copyright (C) 1996, 1997, 1999, 2000 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 #include <features.h>
  24
  25 /*
  26   `ptmalloc', a malloc implementation for multiple threads without
  27   lock contention, by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>.
  28   See the files `ptmalloc.c' or `COPYRIGHT' for copying conditions.
  29
  30   VERSION 2.6.4-pt Wed Dec  4 00:35:54 MET 1996
  31
  32   This work is mainly derived from malloc-2.6.4 by Doug Lea
  33   <dl@cs.oswego.edu>, which is available from:
  34
  35                  ftp://g.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   `ptmalloc.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 # if defined __cplusplus && (__GNUC__ >= 3 || __GNUC_MINOR__ >= 8)
  68 #  define __THROW       throw ()
  69 # else
  70 #  define __THROW
  71 # endif
  72 # define __MALLOC_P(args)       args __THROW
  73 /* This macro will be used for functions which might take C++ callback
  74    functions.  */
  75 # define __MALLOC_PMT(args)     args
  76
  77 #else   /* Not GCC.  */
  78
  79 # define __THROW
  80
  81 # if (defined __STDC__ && __STDC__) || defined __cplusplus
  82
  83 #  define __MALLOC_P(args)      args
  84 #  define __MALLOC_PMT(args)    args
  85
  86 # else  /* Not ANSI C or C++.  */
  87
  88 #  define __MALLOC_P(args)      ()      /* No prototypes.  */
  89 #  define __MALLOC_PMT(args)    ()
  90
  91 # endif /* ANSI C or C++.  */
  92
  93 #endif  /* GCC.  */
  94
  95 #ifndef NULL
  96 # ifdef __cplusplus
  97 #  define NULL  0
  98 # else
  99 #  define NULL  ((__malloc_ptr_t) 0)
 100 # endif
 101 #endif
 102
 103 #ifdef __cplusplus
 104 extern "C" {
 105 #endif
 106
 107 /* Nonzero if the malloc is already initialized.  */
 108 #ifdef _LIBC
 109 /* In the GNU libc we rename the global variable
 110    `__malloc_initialized' to `__libc_malloc_initialized'.  */
 111 # define __malloc_initialized __libc_malloc_initialized
 112 #endif
 113 extern int __malloc_initialized;
 114
 115 /* Initialize global configuration.  Not needed with GNU libc. */
 116 #ifndef __GLIBC__
 117 extern void ptmalloc_init __MALLOC_P ((void));
 118 #endif
 119
 120 /* Allocate SIZE bytes of memory.  */
 121 extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
 122
 123 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
 124 extern __malloc_ptr_t calloc __MALLOC_P ((size_t __nmemb, size_t __size))
 125        __attribute_malloc__;
 126
 127 /* Re-allocate the previously allocated block in __ptr, making the new
 128    block SIZE bytes long.  */
 129 extern __malloc_ptr_t realloc __MALLOC_P ((__malloc_ptr_t __ptr,
 130                                            size_t __size))
 131        __attribute_malloc__;
 132
 133 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 134 extern void free __MALLOC_P ((__malloc_ptr_t __ptr));
 135
 136 /* Free a block allocated by `calloc'. */
 137 extern void cfree __MALLOC_P ((__malloc_ptr_t __ptr));
 138
 139 /* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
 140 extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));
 141
 142 /* Allocate SIZE bytes on a page boundary.  */
 143 extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
 144
 145 /* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
 146    __size to nearest pagesize. */
 147 extern __malloc_ptr_t  pvalloc __MALLOC_P ((size_t __size))
 148        __attribute_malloc__;
 149
 150 /* Underlying allocation function; successive calls should return
 151    contiguous pieces of memory.  */
 152 extern __malloc_ptr_t (*__morecore) __MALLOC_PMT ((ptrdiff_t __size));
 153
 154 /* Default value of `__morecore'.  */
 155 extern __malloc_ptr_t __default_morecore __MALLOC_P ((ptrdiff_t __size))
 156        __attribute_malloc__;
 157
 158 /* SVID2/XPG mallinfo structure */
 159 struct mallinfo {
 160   int arena;    /* total space allocated from system */
 161   int ordblks;  /* number of non-inuse chunks */
 162   int smblks;   /* unused -- always zero */
 163   int hblks;    /* number of mmapped regions */
 164   int hblkhd;   /* total space in mmapped regions */
 165   int usmblks;  /* unused -- always zero */
 166   int fsmblks;  /* unused -- always zero */
 167   int uordblks; /* total allocated space */
 168   int fordblks; /* total non-inuse 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    /* UNUSED in this malloc */
 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 #if defined __GLIBC__ || defined MALLOC_HOOKS
 218 /* Called once when malloc is initialized; redefining this variable in
 219    the application provides the preferred way to set up the hook
 220    pointers. */
 221 extern void (*__malloc_initialize_hook) __MALLOC_PMT ((void));
 222 /* Hooks for debugging and user-defined versions. */
 223 extern void (*__free_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
 224                                         __const __malloc_ptr_t));
 225 extern __malloc_ptr_t (*__malloc_hook) __MALLOC_PMT ((size_t __size,
 226                                                     __const __malloc_ptr_t));
 227 extern __malloc_ptr_t (*__realloc_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
 228                                                      size_t __size,
 229                                                      __const __malloc_ptr_t));
 230 extern __malloc_ptr_t (*__memalign_hook) __MALLOC_PMT ((size_t __alignment,
 231                                                       size_t __size,
 232                                                       __const __malloc_ptr_t));
 233 extern void (*__after_morecore_hook) __MALLOC_PMT ((void));
 234
 235 /* Activate a standard set of debugging hooks. */
 236 extern void __malloc_check_init __MALLOC_P ((void));
 237 #endif
 238
 239 #ifdef __cplusplus
 240 }; /* end of extern "C" */
 241 #endif
 242
 243 #endif /* malloc.h */