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.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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
58 #elif !defined __attribute_malloc__
59 # define __attribute_malloc__
64 /* GCC can always grok prototypes. For C++ programs we add throw()
65 to help it optimize the function calls. But this works only with
66 gcc 2.8.x and egcs. */
67 # if defined __cplusplus && (__GNUC__ >= 3 || __GNUC_MINOR__ >= 8)
68 # define __THROW throw ()
72 # define __MALLOC_P(args) args __THROW
73 /* This macro will be used for functions which might take C++ callback
75 # define __MALLOC_PMT(args) args
81 # if (defined __STDC__ && __STDC__) || defined __cplusplus
83 # define __MALLOC_P(args) args
84 # define __MALLOC_PMT(args) args
86 # else /* Not ANSI C or C++. */
88 # define __MALLOC_P(args) () /* No prototypes. */
89 # define __MALLOC_PMT(args) ()
91 # endif /* ANSI C or C++. */
99 # define NULL ((__malloc_ptr_t) 0)
107 /* Allocate SIZE bytes of memory. */
108 extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
110 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
111 extern __malloc_ptr_t calloc __MALLOC_P ((size_t __nmemb, size_t __size))
112 __attribute_malloc__;
114 /* Re-allocate the previously allocated block in __ptr, making the new
115 block SIZE bytes long. */
116 extern __malloc_ptr_t realloc __MALLOC_P ((__malloc_ptr_t __ptr,
118 __attribute_malloc__;
120 /* Free a block allocated by `malloc', `realloc' or `calloc'. */
121 extern void free __MALLOC_P ((__malloc_ptr_t __ptr));
123 /* Allocate SIZE bytes allocated to ALIGNMENT bytes. */
124 extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));
126 /* Allocate SIZE bytes on a page boundary. */
127 extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
129 #ifdef __MALLOC_STANDARD__
131 /* SVID2/XPG mallinfo structure */
133 int arena; /* total space allocated from system */
134 int ordblks; /* number of non-inuse chunks */
135 int smblks; /* unused -- always zero */
136 int hblks; /* number of mmapped regions */
137 int hblkhd; /* total space in mmapped regions */
138 int usmblks; /* unused -- always zero */
139 int fsmblks; /* unused -- always zero */
140 int uordblks; /* total allocated space */
141 int fordblks; /* total non-inuse space */
142 int keepcost; /* top-most, releasable (via malloc_trim) space */
145 /* Returns a copy of the updated current mallinfo. */
146 extern struct mallinfo mallinfo __MALLOC_P ((void));
148 /* Release all but __pad bytes of freed top-most memory back to the
149 system. Return 1 if successful, else 0. */
150 extern int malloc_trim(size_t pad);
153 /* Prints brief summary statistics to the specified file.
154 * Writes to stderr if file is NULL. */
155 extern void malloc_stats(FILE *file);
157 /* SVID2/XPG mallopt options */
159 # define M_MXFAST 1 /* UNUSED in this malloc */
162 # define M_NLBLKS 2 /* UNUSED in this malloc */
165 # define M_GRAIN 3 /* UNUSED in this malloc */
168 # define M_KEEP 4 /* UNUSED in this malloc */
171 /* mallopt options that actually do something */
172 #define M_TRIM_THRESHOLD -1
174 #define M_MMAP_THRESHOLD -3
175 #define M_MMAP_MAX -4
176 #define M_CHECK_ACTION -5
179 /* General SVID/XPG interface to tunable parameters. */
180 extern int mallopt __MALLOC_P ((int __param, int __val));
182 #endif /* __MALLOC_STANDARD__ */
186 } /* end of extern "C" */
189 #endif /* malloc.h */