about summary refs log tree commit diff
path: root/malloc/malloc.h
blob: 5ddd780958cfc6647c318fb0250009777f99e49c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
/* Prototypes and definition for malloc implementation.
   Copyright (C) 1996, 1997, 1999, 2000, 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _MALLOC_H
#define _MALLOC_H 1

#ifdef _LIBC
#include <features.h>
#endif

/*
  $Id$
  `ptmalloc2', a malloc implementation for multiple threads without
  lock contention, by Wolfram Gloger <wg@malloc.de>.

  VERSION 2.7.0

  This work is mainly derived from malloc-2.7.0 by Doug Lea
  <dl@cs.oswego.edu>, which is available from:

                 ftp://gee.cs.oswego.edu/pub/misc/malloc.c

  This trimmed-down header file only provides function prototypes and
  the exported data structures.  For more detailed function
  descriptions and compile-time options, see the source file
  `malloc.c'.
*/

#if defined(__STDC__) || defined (__cplusplus)
# include <stddef.h>
# define __malloc_ptr_t  void *
#else
# undef  size_t
# define size_t          unsigned int
# undef  ptrdiff_t
# define ptrdiff_t       int
# define __malloc_ptr_t  char *
#endif

#ifdef _LIBC
/* Used by GNU libc internals. */
# define __malloc_size_t size_t
# define __malloc_ptrdiff_t ptrdiff_t
#elif !defined __attribute_malloc__
# define __attribute_malloc__
#endif

#ifdef __GNUC__

/* GCC can always grok prototypes.  For C++ programs we add throw()
   to help it optimize the function calls.  But this works only with
   gcc 2.8.x and egcs.  */
# if defined __cplusplus && (__GNUC__ >= 3 || __GNUC_MINOR__ >= 8)
#  define __THROW	throw ()
# else
#  define __THROW
# endif
# define __MALLOC_P(args)	args __THROW
/* This macro will be used for functions which might take C++ callback
   functions.  */
# define __MALLOC_PMT(args)	args

#else	/* Not GCC.  */

# define __THROW

# if (defined __STDC__ && __STDC__) || defined __cplusplus

#  define __MALLOC_P(args)	args
#  define __MALLOC_PMT(args)	args

# else	/* Not ANSI C or C++.  */

#  define __MALLOC_P(args)	()	/* No prototypes.  */
#  define __MALLOC_PMT(args)	()

# endif	/* ANSI C or C++.  */

#endif	/* GCC.  */

#ifndef NULL
# ifdef __cplusplus
#  define NULL	0
# else
#  define NULL	((__malloc_ptr_t) 0)
# endif
#endif

#ifdef __cplusplus
extern "C" {
#endif

/* Allocate SIZE bytes of memory.  */
extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size)) __attribute_malloc__;

/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
extern __malloc_ptr_t calloc __MALLOC_P ((size_t __nmemb, size_t __size))
       __attribute_malloc__;

/* Re-allocate the previously allocated block in __ptr, making the new
   block SIZE bytes long.  */
extern __malloc_ptr_t realloc __MALLOC_P ((__malloc_ptr_t __ptr,
					   size_t __size))
       __attribute_malloc__;

/* Free a block allocated by `malloc', `realloc' or `calloc'.  */
extern void free __MALLOC_P ((__malloc_ptr_t __ptr));

/* Free a block allocated by `calloc'. */
extern void cfree __MALLOC_P ((__malloc_ptr_t __ptr));

/* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));

/* Allocate SIZE bytes on a page boundary.  */
extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size)) __attribute_malloc__;

/* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
   __size to nearest pagesize. */
extern __malloc_ptr_t  pvalloc __MALLOC_P ((size_t __size))
       __attribute_malloc__;

/* Underlying allocation function; successive calls should return
   contiguous pieces of memory.  */
extern __malloc_ptr_t (*__morecore) __MALLOC_PMT ((ptrdiff_t __size));

/* Default value of `__morecore'.  */
extern __malloc_ptr_t __default_morecore __MALLOC_P ((ptrdiff_t __size))
       __attribute_malloc__;

/* SVID2/XPG mallinfo structure */

struct mallinfo {
  int arena;    /* non-mmapped space allocated from system */
  int ordblks;  /* number of free chunks */
  int smblks;   /* number of fastbin blocks */
  int hblks;    /* number of mmapped regions */
  int hblkhd;   /* space in mmapped regions */
  int usmblks;  /* maximum total allocated space */
  int fsmblks;  /* space available in freed fastbin blocks */
  int uordblks; /* total allocated space */
  int fordblks; /* total free space */
  int keepcost; /* top-most, releasable (via malloc_trim) space */
};

/* Returns a copy of the updated current mallinfo. */
extern struct mallinfo mallinfo __MALLOC_P ((void));

/* SVID2/XPG mallopt options */
#ifndef M_MXFAST
# define M_MXFAST  1	/* maximum request size for "fastbins" */
#endif
#ifndef M_NLBLKS
# define M_NLBLKS  2	/* UNUSED in this malloc */
#endif
#ifndef M_GRAIN
# define M_GRAIN   3	/* UNUSED in this malloc */
#endif
#ifndef M_KEEP
# define M_KEEP    4	/* UNUSED in this malloc */
#endif

/* mallopt options that actually do something */
#define M_TRIM_THRESHOLD    -1
#define M_TOP_PAD           -2
#define M_MMAP_THRESHOLD    -3
#define M_MMAP_MAX          -4
#define M_CHECK_ACTION      -5

/* General SVID/XPG interface to tunable parameters. */
extern int mallopt __MALLOC_P ((int __param, int __val));

/* Release all but __pad bytes of freed top-most memory back to the
   system. Return 1 if successful, else 0. */
extern int malloc_trim __MALLOC_P ((size_t __pad));

/* Report the number of usable allocated bytes associated with allocated
   chunk __ptr. */
extern size_t malloc_usable_size __MALLOC_P ((__malloc_ptr_t __ptr));

/* Prints brief summary statistics on stderr. */
extern void malloc_stats __MALLOC_P ((void));

/* Record the state of all malloc variables in an opaque data structure. */
extern __malloc_ptr_t malloc_get_state __MALLOC_P ((void));

/* Restore the state of all malloc variables from data obtained with
   malloc_get_state(). */
extern int malloc_set_state __MALLOC_P ((__malloc_ptr_t __ptr));

/* Called once when malloc is initialized; redefining this variable in
   the application provides the preferred way to set up the hook
   pointers. */
extern void (*__malloc_initialize_hook) __MALLOC_PMT ((void));
/* Hooks for debugging and user-defined versions. */
extern void (*__free_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
					__const __malloc_ptr_t));
extern __malloc_ptr_t (*__malloc_hook) __MALLOC_PMT ((size_t __size,
						    __const __malloc_ptr_t));
extern __malloc_ptr_t (*__realloc_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
						     size_t __size,
						     __const __malloc_ptr_t));
extern __malloc_ptr_t (*__memalign_hook) __MALLOC_PMT ((size_t __alignment,
						      size_t __size,
						      __const __malloc_ptr_t));
extern void (*__after_morecore_hook) __MALLOC_PMT ((void));

/* Activate a standard set of debugging hooks. */
extern void __malloc_check_init __MALLOC_P ((void));

/* Internal routines, operating on "arenas".  */
struct malloc_state;
typedef struct malloc_state *mstate;

extern mstate         _int_new_arena __MALLOC_P ((size_t __ini_size));
extern __malloc_ptr_t _int_malloc __MALLOC_P ((mstate __m, size_t __size));
extern void           _int_free __MALLOC_P ((mstate __m, __malloc_ptr_t __ptr));
extern __malloc_ptr_t _int_realloc __MALLOC_P ((mstate __m,
						__malloc_ptr_t __ptr,
						size_t __size));
extern __malloc_ptr_t _int_memalign __MALLOC_P ((mstate __m, size_t __alignment,
						 size_t __size));

#ifdef __cplusplus
}; /* end of extern "C" */
#endif

#endif /* malloc.h */