include/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 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _MALLOC_H
  20 #define _MALLOC_H 1
  21
  22 #include <features.h>
  23
  24 /*
  25   `ptmalloc', a malloc implementation for multiple threads without
  26   lock contention, by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>.
  27   See the files `ptmalloc.c' or `COPYRIGHT' for copying conditions.
  28
  29   VERSION 2.6.4-pt Wed Dec  4 00:35:54 MET 1996
  30
  31   This work is mainly derived from malloc-2.6.4 by Doug Lea
  32   <dl@cs.oswego.edu>, which is available from:
  33
  34                  ftp://g.oswego.edu/pub/misc/malloc.c
  35
  36   This trimmed-down header file only provides function prototypes and
  37   the exported data structures.  For more detailed function
  38   descriptions and compile-time options, see the source file
  39   `ptmalloc.c'.
  40 */
  41
  42 #if defined(__STDC__) || defined (__cplusplus)
  43 # include <stddef.h>
  44 # define __malloc_ptr_t  void *
  45 #else
  46 # undef  size_t
  47 # define size_t          unsigned int
  48 # undef  ptrdiff_t
  49 # define ptrdiff_t       int
  50 # define __malloc_ptr_t  char *
  51 #endif
  52
  53 #ifdef _LIBC
  54 /* Used by GNU libc internals. */
  55 # define __malloc_size_t size_t
  56 # define __malloc_ptrdiff_t ptrdiff_t
  57 #elif !defined __attribute_malloc__
  58 # define __attribute_malloc__
  59 #endif
  60
  61 #ifdef __GNUC__
  62
  63 /* GCC can always grok prototypes.  For C++ programs we add throw()
  64    to help it optimize the function calls.  But this works only with
  65    gcc 2.8.x and egcs.  */
  66 #ifndef __THROW
  67 # if defined __cplusplus && (__GNUC__ >= 3 || __GNUC_MINOR__ >= 8)
  68 #  define __THROW       throw ()
  69 # else
  70 #  define __THROW
  71 # endif
  72 #endif
  73 # define __MALLOC_P(args)       args __THROW
  74 /* This macro will be used for functions which might take C++ callback
  75    functions.  */
  76 # define __MALLOC_PMT(args)     args
  77
  78 #else   /* Not GCC.  */
  79
  80 # define __THROW
  81
  82 # if (defined __STDC__ && __STDC__) || defined __cplusplus
  83
  84 #  define __MALLOC_P(args)      args
  85 #  define __MALLOC_PMT(args)    args
  86
  87 # else  /* Not ANSI C or C++.  */
  88
  89 #  define __MALLOC_P(args)      ()      /* No prototypes.  */
  90 #  define __MALLOC_PMT(args)    ()
  91
  92 # endif /* ANSI C or C++.  */
  93
  94 #endif  /* GCC.  */
  95
  96 #ifndef NULL
  97 # ifdef __cplusplus
  98 #  define NULL  0
  99 # else
 100 #  define NULL  ((__malloc_ptr_t) 0)
 101 # endif
 102 #endif
 103
 104 #ifdef __cplusplus
 105 extern "C" {
 106 #endif
 107
 108 /* Allocate SIZE bytes of memory.  */
 109 extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
 110
 111 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
 112 extern __malloc_ptr_t calloc __MALLOC_P ((size_t __nmemb, size_t __size))
 113        __attribute_malloc__;
 114
 115 /* Re-allocate the previously allocated block in __ptr, making the new
 116    block SIZE bytes long.  */
 117 extern __malloc_ptr_t realloc __MALLOC_P ((__malloc_ptr_t __ptr,
 118                                            size_t __size))
 119        __attribute_malloc__;
 120
 121 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 122 extern void free __MALLOC_P ((__malloc_ptr_t __ptr));
 123
 124 /* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
 125 extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));
 126 libc_hidden_proto(memalign)
 127
 128 #ifdef __UCLIBC_SUSV2_LEGACY__
 129 /* Allocate SIZE bytes on a page boundary.  */
 130 extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
 131 #endif
 132
 133 #ifdef __MALLOC_STANDARD__
 134
 135 /* SVID2/XPG mallinfo structure */
 136 struct mallinfo {
 137   int arena;    /* total space allocated from system */
 138   int ordblks;  /* number of non-inuse chunks */
 139   int smblks;   /* unused -- always zero */
 140   int hblks;    /* number of mmapped regions */
 141   int hblkhd;   /* total space in mmapped regions */
 142   int usmblks;  /* unused -- always zero */
 143   int fsmblks;  /* unused -- always zero */
 144   int uordblks; /* total allocated space */
 145   int fordblks; /* total non-inuse space */
 146   int keepcost; /* top-most, releasable (via malloc_trim) space */
 147 };
 148
 149 /* Returns a copy of the updated current mallinfo. */
 150 extern struct mallinfo mallinfo __MALLOC_P ((void));
 151 libc_hidden_proto(mallinfo)
 152
 153 /* Release all but __pad bytes of freed top-most memory back to the
 154    system. Return 1 if successful, else 0. */
 155 extern int malloc_trim(size_t pad);
 156
 157 #include <stdio.h>
 158 /* Prints brief summary statistics to the specified file.
 159  * Writes to stderr if file is NULL. */
 160 extern void malloc_stats(FILE *file);
 161
 162 /* SVID2/XPG mallopt options */
 163 #ifndef M_MXFAST
 164 # define M_MXFAST  1    /* UNUSED in this malloc */
 165 #endif
 166 #ifndef M_NLBLKS
 167 # define M_NLBLKS  2    /* UNUSED in this malloc */
 168 #endif
 169 #ifndef M_GRAIN
 170 # define M_GRAIN   3    /* UNUSED in this malloc */
 171 #endif
 172 #ifndef M_KEEP
 173 # define M_KEEP    4    /* UNUSED in this malloc */
 174 #endif
 175
 176 /* mallopt options that actually do something */
 177 #define M_TRIM_THRESHOLD    -1
 178 #define M_TOP_PAD           -2
 179 #define M_MMAP_THRESHOLD    -3
 180 #define M_MMAP_MAX          -4
 181 #define M_CHECK_ACTION      -5
 182 #define M_PERTURB           -6
 183
 184 /* General SVID/XPG interface to tunable parameters. */
 185 extern int mallopt __MALLOC_P ((int __param, int __val));
 186
 187 #endif /* __MALLOC_STANDARD__ */
 188
 189 /* uClibc may use malloc internally in situations where user can not be
 190  * notified about out-of-memory condition. In this situation uClibc will
 191  * call __uc_malloc_failed if it is non-NULL, and retry allocation
 192  * if it returns. If __uc_malloc_failed is NULL, uclibc will _exit(1).
 193  * NB: do not use stdio in __uc_malloc_failed handler! */
 194 extern void *__uc_malloc(size_t size);
 195 libc_hidden_proto(__uc_malloc)
 196 extern void (*__uc_malloc_failed)(size_t size);
 197 libc_hidden_proto(__uc_malloc_failed)
 198
 199 #ifdef __cplusplus
 200 } /* end of extern "C" */
 201 #endif
 202
 203 #endif /* malloc.h */