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.
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. */
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.
28 VERSION 2.6.4-pt Wed Dec 4 00:35:54 MET 1996
30 This work is mainly derived from malloc-2.6.4 by Doug Lea
31 <dl@cs.oswego.edu>, which is available from:
33 ftp://g.oswego.edu/pub/misc/malloc.c
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
41 #if defined(__STDC__) || defined (__cplusplus)
43 #define __malloc_ptr_t void *
46 #define size_t unsigned int
49 #define __malloc_ptr_t char *
53 /* Used by GNU libc internals. */
54 #define __malloc_size_t size_t
55 #define __malloc_ptrdiff_t ptrdiff_t
58 #if defined (__STDC__) || defined (__cplusplus) || defined (__GNUC__)
59 #define __MALLOC_P(args) args
61 #define __MALLOC_P(args) ()
68 #define NULL ((__malloc_ptr_t) 0)
76 /* Nonzero if the malloc is already initialized. */
78 /* In the GNU libc we rename the global variable
79 `__malloc_initialized' to `__libc_malloc_initialized'. */
80 #define __malloc_initialized __libc_malloc_initialized
82 extern int __malloc_initialized;
84 /* Initialize global configuration. Not needed with GNU libc. */
86 extern void ptmalloc_init __MALLOC_P ((void));
89 /* Allocate SIZE bytes of memory. */
90 extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size));
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));
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));
99 /* Free a block allocated by `malloc', `realloc' or `calloc'. */
100 extern void free __MALLOC_P ((__malloc_ptr_t __ptr));
102 /* Free a block allocated by `calloc'. */
103 extern void cfree __MALLOC_P ((__malloc_ptr_t __ptr));
105 /* Allocate SIZE bytes allocated to ALIGNMENT bytes. */
106 extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));
108 /* Allocate SIZE bytes on a page boundary. */
109 extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size));
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));
115 /* Underlying allocation function; successive calls should return
116 contiguous pieces of memory. */
117 extern __malloc_ptr_t (*__morecore) __MALLOC_P ((ptrdiff_t __size));
119 /* Default value of `__morecore'. */
120 extern __malloc_ptr_t __default_morecore __MALLOC_P ((ptrdiff_t __size));
122 /* SVID2/XPG mallinfo structure */
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 */
136 /* Returns a copy of the updated current mallinfo. */
137 extern struct mallinfo mallinfo __MALLOC_P ((void));
139 /* SVID2/XPG mallopt options */
141 #define M_MXFAST 1 /* UNUSED in this malloc */
144 #define M_NLBLKS 2 /* UNUSED in this malloc */
147 #define M_GRAIN 3 /* UNUSED in this malloc */
150 #define M_KEEP 4 /* UNUSED in this malloc */
153 /* mallopt options that actually do something */
154 #define M_TRIM_THRESHOLD -1
156 #define M_MMAP_THRESHOLD -3
157 #define M_MMAP_MAX -4
158 #define M_CHECK_ACTION -5
160 /* General SVID/XPG interface to tunable parameters. */
161 extern int mallopt __MALLOC_P ((int __param, int __val));
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));
167 /* Report the number of usable allocated bytes associated with allocated
169 extern size_t malloc_usable_size __MALLOC_P ((__malloc_ptr_t __ptr));
171 /* Prints brief summary statistics on stderr. */
172 extern void malloc_stats __MALLOC_P ((void));
174 /* Record the state of all malloc variables in an opaque data structure. */
175 extern __malloc_ptr_t malloc_get_state __MALLOC_P ((void));
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));
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,
190 __const __malloc_ptr_t));
191 extern __malloc_ptr_t (*__memalign_hook) __MALLOC_P ((size_t __size,
193 __const __malloc_ptr_t));
194 extern void (*__after_morecore_hook) __MALLOC_P ((void));
196 /* Activate a standard set of debugging hooks. */
197 extern void __malloc_check_init __MALLOC_P ((void));
200 /* Hooks for debugging versions. */
201 extern void (*__malloc_initialize_hook) __MALLOC_P ((void));
202 extern void (*__free_hook) __MALLOC_P ((__malloc_ptr_t __ptr));
203 extern __malloc_ptr_t (*__malloc_hook) __MALLOC_P ((size_t __size));
204 extern __malloc_ptr_t (*__realloc_hook) __MALLOC_P ((__malloc_ptr_t __ptr,
206 extern __malloc_ptr_t (*__memalign_hook) __MALLOC_P ((size_t __size,
207 size_t __alignment));
208 extern void (*__after_morecore_hook) __MALLOC_P ((void));
210 /* Activate a standard set of debugging hooks. */
211 extern void __malloc_check_init __MALLOC_P ((void));
216 }; /* end of extern "C" */
219 #endif /* malloc.h */