1 /* Prototypes and definition for malloc implementation.
2 Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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. */
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.
30 VERSION 2.6.4-pt Wed Dec 4 00:35:54 MET 1996
32 This work is mainly derived from malloc-2.6.4 by Doug Lea
33 <dl@cs.oswego.edu>, which is available from:
35 ftp://g.oswego.edu/pub/misc/malloc.c
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
43 #if defined(__STDC__) || defined (__cplusplus)
45 # define __malloc_ptr_t void *
48 # define size_t unsigned int
50 # define ptrdiff_t int
51 # define __malloc_ptr_t char *
55 /* Used by GNU libc internals. */
56 # define __malloc_size_t size_t
57 # define __malloc_ptrdiff_t ptrdiff_t
62 /* GCC can always grok prototypes. For C++ programs we add throw()
63 to help it optimize the function calls. But this works only with
64 gcc 2.8.x and egcs. */
65 # if defined __cplusplus && (__GNUC__ >= 3 || __GNUC_MINOR__ >= 8)
66 # define __THROW throw ()
70 # define __MALLOC_P(args) args __THROW
71 /* This macro will be used for functions which might take C++ callback
73 # define __MALLOC_PMT(args) args
77 # if (defined __STDC__ && __STDC__) || defined __cplusplus
79 # define __MALLOC_P(args) args
80 # define __MALLOC_PMT(args) args
82 # else /* Not ANSI C or C++. */
84 # define __MALLOC_P(args) () /* No prototypes. */
85 # define __MALLOC_PMT(args) ()
87 # endif /* ANSI C or C++. */
95 # define NULL ((__malloc_ptr_t) 0)
103 /* Nonzero if the malloc is already initialized. */
105 /* In the GNU libc we rename the global variable
106 `__malloc_initialized' to `__libc_malloc_initialized'. */
107 # define __malloc_initialized __libc_malloc_initialized
109 extern int __malloc_initialized
;
111 /* Initialize global configuration. Not needed with GNU libc. */
113 extern void ptmalloc_init
__MALLOC_P ((void));
116 /* Allocate SIZE bytes of memory. */
117 extern __malloc_ptr_t malloc
__MALLOC_P ((size_t __size
));
119 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
120 extern __malloc_ptr_t calloc
__MALLOC_P ((size_t __nmemb
, size_t __size
));
122 /* Re-allocate the previously allocated block in __ptr, making the new
123 block SIZE bytes long. */
124 extern __malloc_ptr_t realloc
__MALLOC_P ((__malloc_ptr_t __ptr
, size_t __size
));
126 /* Free a block allocated by `malloc', `realloc' or `calloc'. */
127 extern void free
__MALLOC_P ((__malloc_ptr_t __ptr
));
129 /* Free a block allocated by `calloc'. */
130 extern void cfree
__MALLOC_P ((__malloc_ptr_t __ptr
));
132 /* Allocate SIZE bytes allocated to ALIGNMENT bytes. */
133 extern __malloc_ptr_t memalign
__MALLOC_P ((size_t __alignment
, size_t __size
));
135 /* Allocate SIZE bytes on a page boundary. */
136 extern __malloc_ptr_t valloc
__MALLOC_P ((size_t __size
));
138 /* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
139 __size to nearest pagesize. */
140 extern __malloc_ptr_t pvalloc
__MALLOC_P ((size_t __size
));
142 /* Underlying allocation function; successive calls should return
143 contiguous pieces of memory. */
144 extern __malloc_ptr_t (*__morecore
) __MALLOC_PMT ((ptrdiff_t __size
));
146 /* Default value of `__morecore'. */
147 extern __malloc_ptr_t __default_morecore
__MALLOC_P ((ptrdiff_t __size
));
149 /* SVID2/XPG mallinfo structure */
151 int arena
; /* total space allocated from system */
152 int ordblks
; /* number of non-inuse chunks */
153 int smblks
; /* unused -- always zero */
154 int hblks
; /* number of mmapped regions */
155 int hblkhd
; /* total space in mmapped regions */
156 int usmblks
; /* unused -- always zero */
157 int fsmblks
; /* unused -- always zero */
158 int uordblks
; /* total allocated space */
159 int fordblks
; /* total non-inuse space */
160 int keepcost
; /* top-most, releasable (via malloc_trim) space */
163 /* Returns a copy of the updated current mallinfo. */
164 extern struct mallinfo mallinfo
__MALLOC_P ((void));
166 /* SVID2/XPG mallopt options */
168 # define M_MXFAST 1 /* UNUSED in this malloc */
171 # define M_NLBLKS 2 /* UNUSED in this malloc */
174 # define M_GRAIN 3 /* UNUSED in this malloc */
177 # define M_KEEP 4 /* UNUSED in this malloc */
180 /* mallopt options that actually do something */
181 #define M_TRIM_THRESHOLD -1
183 #define M_MMAP_THRESHOLD -3
184 #define M_MMAP_MAX -4
185 #define M_CHECK_ACTION -5
187 /* General SVID/XPG interface to tunable parameters. */
188 extern int mallopt
__MALLOC_P ((int __param
, int __val
));
190 /* Release all but __pad bytes of freed top-most memory back to the
191 system. Return 1 if successful, else 0. */
192 extern int malloc_trim
__MALLOC_P ((size_t __pad
));
194 /* Report the number of usable allocated bytes associated with allocated
196 extern size_t malloc_usable_size
__MALLOC_P ((__malloc_ptr_t __ptr
));
198 /* Prints brief summary statistics on stderr. */
199 extern void malloc_stats
__MALLOC_P ((void));
201 /* Record the state of all malloc variables in an opaque data structure. */
202 extern __malloc_ptr_t malloc_get_state
__MALLOC_P ((void));
204 /* Restore the state of all malloc variables from data obtained with
205 malloc_get_state(). */
206 extern int malloc_set_state
__MALLOC_P ((__malloc_ptr_t __ptr
));
208 #if defined __GLIBC__ || defined MALLOC_HOOKS
209 /* Called once when malloc is initialized; redefining this variable in
210 the application provides the preferred way to set up the hook
212 extern void (*__malloc_initialize_hook
) __MALLOC_PMT ((void));
213 /* Hooks for debugging and user-defined versions. */
214 extern void (*__free_hook
) __MALLOC_PMT ((__malloc_ptr_t __ptr
,
215 __const __malloc_ptr_t
));
216 extern __malloc_ptr_t (*__malloc_hook
) __MALLOC_PMT ((size_t __size
,
217 __const __malloc_ptr_t
));
218 extern __malloc_ptr_t (*__realloc_hook
) __MALLOC_PMT ((__malloc_ptr_t __ptr
,
220 __const __malloc_ptr_t
));
221 extern __malloc_ptr_t (*__memalign_hook
) __MALLOC_PMT ((size_t __size
,
223 __const __malloc_ptr_t
));
224 extern void (*__after_morecore_hook
) __MALLOC_PMT ((void));
226 /* Activate a standard set of debugging hooks. */
227 extern void __malloc_check_init
__MALLOC_P ((void));
231 }; /* end of extern "C" */
234 #endif /* malloc.h */