malloc/malloc.h

   1 /* Prototypes and definition for malloc implementation.
   2    Copyright (C) 1996, 1997 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 #ifdef _LIBC
  78 /* In the GNU libc we rename the global variable
  79    `__malloc_initialized' to `__libc_malloc_initialized'.  */
  80 # define __malloc_initialized __libc_malloc_initialized
  81 #endif
  82 extern int __malloc_initialized;
  83
  84 /* Initialize global configuration.  Not needed with GNU libc. */
  85 #ifndef __GLIBC__
  86 extern void ptmalloc_init __MALLOC_P ((void));
  87 #endif
  88
  89 /* Allocate SIZE bytes of memory.  */
  90 extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size));
  91
  92 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
  93 extern __malloc_ptr_t calloc __MALLOC_P ((size_t __nmemb, size_t __size));
  94
  95 /* Re-allocate the previously allocated block in __ptr, making the new
  96    block SIZE bytes long.  */
  97 extern __malloc_ptr_t realloc __MALLOC_P ((__malloc_ptr_t __ptr, size_t __size));
  98
  99 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 100 extern void free __MALLOC_P ((__malloc_ptr_t __ptr));
 101
 102 /* Free a block allocated by `calloc'. */
 103 extern void cfree __MALLOC_P ((__malloc_ptr_t __ptr));
 104
 105 /* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
 106 extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));
 107
 108 /* Allocate SIZE bytes on a page boundary.  */
 109 extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size));
 110
 111 /* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
 112    __size to nearest pagesize. */
 113 extern __malloc_ptr_t  pvalloc __MALLOC_P ((size_t __size));
 114
 115 /* Underlying allocation function; successive calls should return
 116    contiguous pieces of memory.  */
 117 extern __malloc_ptr_t (*__morecore) __MALLOC_P ((ptrdiff_t __size));
 118
 119 /* Default value of `__morecore'.  */
 120 extern __malloc_ptr_t __default_morecore __MALLOC_P ((ptrdiff_t __size));
 121
 122 /* SVID2/XPG mallinfo structure */
 123 struct mallinfo {
 124   int arena;    /* total space allocated from system */
 125   int ordblks;  /* number of non-inuse chunks */
 126   int smblks;   /* unused -- always zero */
 127   int hblks;    /* number of mmapped regions */
 128   int hblkhd;   /* total space in mmapped regions */
 129   int usmblks;  /* unused -- always zero */
 130   int fsmblks;  /* unused -- always zero */
 131   int uordblks; /* total allocated space */
 132   int fordblks; /* total non-inuse space */
 133   int keepcost; /* top-most, releasable (via malloc_trim) space */
 134 };
 135
 136 /* Returns a copy of the updated current mallinfo. */
 137 extern struct mallinfo mallinfo __MALLOC_P ((void));
 138
 139 /* SVID2/XPG mallopt options */
 140 #ifndef M_MXFAST
 141 # define M_MXFAST  1    /* UNUSED in this malloc */
 142 #endif
 143 #ifndef M_NLBLKS
 144 # define M_NLBLKS  2    /* UNUSED in this malloc */
 145 #endif
 146 #ifndef M_GRAIN
 147 # define M_GRAIN   3    /* UNUSED in this malloc */
 148 #endif
 149 #ifndef M_KEEP
 150 # define M_KEEP    4    /* UNUSED in this malloc */
 151 #endif
 152
 153 /* mallopt options that actually do something */
 154 #define M_TRIM_THRESHOLD    -1
 155 #define M_TOP_PAD           -2
 156 #define M_MMAP_THRESHOLD    -3
 157 #define M_MMAP_MAX          -4
 158 #define M_CHECK_ACTION      -5
 159
 160 /* General SVID/XPG interface to tunable parameters. */
 161 extern int mallopt __MALLOC_P ((int __param, int __val));
 162
 163 /* Release all but __pad bytes of freed top-most memory back to the
 164    system. Return 1 if successful, else 0. */
 165 extern int malloc_trim __MALLOC_P ((size_t __pad));
 166
 167 /* Report the number of usable allocated bytes associated with allocated
 168    chunk __ptr. */
 169 extern size_t malloc_usable_size __MALLOC_P ((__malloc_ptr_t __ptr));
 170
 171 /* Prints brief summary statistics on stderr. */
 172 extern void malloc_stats __MALLOC_P ((void));
 173
 174 /* Record the state of all malloc variables in an opaque data structure. */
 175 extern __malloc_ptr_t malloc_get_state __MALLOC_P ((void));
 176
 177 /* Restore the state of all malloc variables from data obtained with
 178    malloc_get_state(). */
 179 extern int malloc_set_state __MALLOC_P ((__malloc_ptr_t __ptr));
 180
 181 #if defined __GLIBC__ || defined MALLOC_HOOKS
 182 /* Hooks for debugging versions. */
 183 extern void (*__malloc_initialize_hook) __MALLOC_P ((void));
 184 extern void (*__free_hook) __MALLOC_P ((__malloc_ptr_t __ptr,
 185                                         __const __malloc_ptr_t));
 186 extern __malloc_ptr_t (*__malloc_hook) __MALLOC_P ((size_t __size,
 187                                                     __const __malloc_ptr_t));
 188 extern __malloc_ptr_t (*__realloc_hook) __MALLOC_P ((__malloc_ptr_t __ptr,
 189                                                      size_t __size,
 190                                                      __const __malloc_ptr_t));
 191 extern __malloc_ptr_t (*__memalign_hook) __MALLOC_P ((size_t __size,
 192                                                       size_t __alignment,
 193                                                       __const __malloc_ptr_t));
 194 extern void (*__after_morecore_hook) __MALLOC_P ((void));
 195
 196 /* Activate a standard set of debugging hooks. */
 197 extern void __malloc_check_init __MALLOC_P ((void));
 198 #endif
 199
 200 #ifdef __cplusplus
 201 }; /* end of extern "C" */
 202 #endif
 203
 204 #endif /* malloc.h */