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glibc/malloc/malloc.h
Ulrich Drepper 9ee4c01788 Update. 
* misc/sys/cdefs.h (__attribute_warn_unused_result__): Define.
	* stdlib/stdlib.h: Make realloc with
	__attribute_warn_unused_result__ instead of __wur.
	* malloc/malloc.h: Add __wur and __attribute_warn_unused_result__
	markers as in <stdlib.h>.
2005-01-07 19:42:24 +00:00

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/* Prototypes and definition for malloc implementation.
Copyright (C) 1996,97,99,2000,2002-2004,2005 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. */
# ifndef __THROW
# if defined __cplusplus && (__GNUC__ >= 3 || __GNUC_MINOR__ >= 8)
# define __THROW throw ()
# else
# define __THROW
# endif
# 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
# ifndef __const
# define __const const
# endif
# else /* Not ANSI C or C++. */
# define __MALLOC_P(args) () /* No prototypes. */
# define __MALLOC_PMT(args) ()
# ifndef __const
# define __const
# endif
# 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__ __wur;
/* 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__ __wur;
/* 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__ __attribute_warn_unused_result__;
/* 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))
__attribute_malloc__ __wur;
/* Allocate SIZE bytes on a page boundary. */
extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size))
__attribute_malloc__ __wur;
/* 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__ __wur;
/* 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));
#ifdef __cplusplus
} /* end of extern "C" */
#endif
#endif /* malloc.h */
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