244 lines
7.8 KiB
C
244 lines
7.8 KiB
C
/* Prototypes and definition for malloc implementation.
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Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _MALLOC_H
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#define _MALLOC_H 1
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#include <features.h>
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/*
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`ptmalloc', a malloc implementation for multiple threads without
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lock contention, by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>.
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See the files `ptmalloc.c' or `COPYRIGHT' for copying conditions.
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VERSION 2.6.4-pt Wed Dec 4 00:35:54 MET 1996
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This work is mainly derived from malloc-2.6.4 by Doug Lea
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<dl@cs.oswego.edu>, which is available from:
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ftp://g.oswego.edu/pub/misc/malloc.c
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This trimmed-down header file only provides function prototypes and
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the exported data structures. For more detailed function
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descriptions and compile-time options, see the source file
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`ptmalloc.c'.
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*/
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#if defined(__STDC__) || defined (__cplusplus)
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# include <stddef.h>
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# define __malloc_ptr_t void *
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#else
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# undef size_t
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# define size_t unsigned int
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# undef ptrdiff_t
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# define ptrdiff_t int
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# define __malloc_ptr_t char *
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#endif
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#ifdef _LIBC
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/* Used by GNU libc internals. */
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# define __malloc_size_t size_t
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# define __malloc_ptrdiff_t ptrdiff_t
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#elif !defined __attribute_malloc__
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# define __attribute_malloc__
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#endif
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#ifdef __GNUC__
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/* GCC can always grok prototypes. For C++ programs we add throw()
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to help it optimize the function calls. But this works only with
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gcc 2.8.x and egcs. */
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# if defined __cplusplus && (__GNUC__ >= 3 || __GNUC_MINOR__ >= 8)
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# define __THROW throw ()
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# else
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# define __THROW
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# endif
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# define __MALLOC_P(args) args __THROW
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/* This macro will be used for functions which might take C++ callback
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functions. */
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# define __MALLOC_PMT(args) args
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#else /* Not GCC. */
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# define __THROW
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# if (defined __STDC__ && __STDC__) || defined __cplusplus
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# define __MALLOC_P(args) args
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# define __MALLOC_PMT(args) args
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# else /* Not ANSI C or C++. */
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# define __MALLOC_P(args) () /* No prototypes. */
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# define __MALLOC_PMT(args) ()
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# endif /* ANSI C or C++. */
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#endif /* GCC. */
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#ifndef NULL
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# ifdef __cplusplus
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# define NULL 0
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# else
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# define NULL ((__malloc_ptr_t) 0)
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# endif
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Nonzero if the malloc is already initialized. */
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#ifdef _LIBC
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/* In the GNU libc we rename the global variable
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`__malloc_initialized' to `__libc_malloc_initialized'. */
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# define __malloc_initialized __libc_malloc_initialized
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#endif
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extern int __malloc_initialized;
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/* Initialize global configuration. Not needed with GNU libc. */
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#ifndef __GLIBC__
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extern void ptmalloc_init __MALLOC_P ((void));
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#endif
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/* Allocate SIZE bytes of memory. */
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extern __malloc_ptr_t malloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
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/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
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extern __malloc_ptr_t calloc __MALLOC_P ((size_t __nmemb, size_t __size))
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__attribute_malloc__;
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/* Re-allocate the previously allocated block in __ptr, making the new
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block SIZE bytes long. */
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extern __malloc_ptr_t realloc __MALLOC_P ((__malloc_ptr_t __ptr,
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size_t __size))
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__attribute_malloc__;
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/* Free a block allocated by `malloc', `realloc' or `calloc'. */
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extern void free __MALLOC_P ((__malloc_ptr_t __ptr));
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/* Free a block allocated by `calloc'. */
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extern void cfree __MALLOC_P ((__malloc_ptr_t __ptr));
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/* Allocate SIZE bytes allocated to ALIGNMENT bytes. */
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extern __malloc_ptr_t memalign __MALLOC_P ((size_t __alignment, size_t __size));
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/* Allocate SIZE bytes on a page boundary. */
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extern __malloc_ptr_t valloc __MALLOC_P ((size_t __size)) __attribute_malloc__;
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/* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
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__size to nearest pagesize. */
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extern __malloc_ptr_t pvalloc __MALLOC_P ((size_t __size))
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__attribute_malloc__;
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/* Underlying allocation function; successive calls should return
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contiguous pieces of memory. */
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extern __malloc_ptr_t (*__morecore) __MALLOC_PMT ((ptrdiff_t __size));
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/* Default value of `__morecore'. */
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extern __malloc_ptr_t __default_morecore __MALLOC_P ((ptrdiff_t __size))
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__attribute_malloc__;
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/* SVID2/XPG mallinfo structure */
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struct mallinfo {
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int arena; /* total space allocated from system */
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int ordblks; /* number of non-inuse chunks */
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int smblks; /* unused -- always zero */
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int hblks; /* number of mmapped regions */
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int hblkhd; /* total space in mmapped regions */
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int usmblks; /* unused -- always zero */
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int fsmblks; /* unused -- always zero */
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int uordblks; /* total allocated space */
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int fordblks; /* total non-inuse space */
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int keepcost; /* top-most, releasable (via malloc_trim) space */
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};
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/* Returns a copy of the updated current mallinfo. */
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extern struct mallinfo mallinfo __MALLOC_P ((void));
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/* SVID2/XPG mallopt options */
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#ifndef M_MXFAST
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# define M_MXFAST 1 /* UNUSED in this malloc */
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#endif
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#ifndef M_NLBLKS
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# define M_NLBLKS 2 /* UNUSED in this malloc */
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#endif
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#ifndef M_GRAIN
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# define M_GRAIN 3 /* UNUSED in this malloc */
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#endif
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#ifndef M_KEEP
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# define M_KEEP 4 /* UNUSED in this malloc */
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#endif
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/* mallopt options that actually do something */
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#define M_TRIM_THRESHOLD -1
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#define M_TOP_PAD -2
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#define M_MMAP_THRESHOLD -3
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#define M_MMAP_MAX -4
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#define M_CHECK_ACTION -5
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/* General SVID/XPG interface to tunable parameters. */
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extern int mallopt __MALLOC_P ((int __param, int __val));
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/* Release all but __pad bytes of freed top-most memory back to the
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system. Return 1 if successful, else 0. */
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extern int malloc_trim __MALLOC_P ((size_t __pad));
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/* Report the number of usable allocated bytes associated with allocated
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chunk __ptr. */
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extern size_t malloc_usable_size __MALLOC_P ((__malloc_ptr_t __ptr));
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/* Prints brief summary statistics on stderr. */
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extern void malloc_stats __MALLOC_P ((void));
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/* Record the state of all malloc variables in an opaque data structure. */
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extern __malloc_ptr_t malloc_get_state __MALLOC_P ((void));
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/* Restore the state of all malloc variables from data obtained with
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malloc_get_state(). */
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extern int malloc_set_state __MALLOC_P ((__malloc_ptr_t __ptr));
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#if defined __GLIBC__ || defined MALLOC_HOOKS
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/* Called once when malloc is initialized; redefining this variable in
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the application provides the preferred way to set up the hook
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pointers. */
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extern void (*__malloc_initialize_hook) __MALLOC_PMT ((void));
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/* Hooks for debugging and user-defined versions. */
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extern void (*__free_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
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__const __malloc_ptr_t));
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extern __malloc_ptr_t (*__malloc_hook) __MALLOC_PMT ((size_t __size,
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__const __malloc_ptr_t));
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extern __malloc_ptr_t (*__realloc_hook) __MALLOC_PMT ((__malloc_ptr_t __ptr,
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size_t __size,
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__const __malloc_ptr_t));
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extern __malloc_ptr_t (*__memalign_hook) __MALLOC_PMT ((size_t __alignment,
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size_t __size,
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__const __malloc_ptr_t));
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extern void (*__after_morecore_hook) __MALLOC_PMT ((void));
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/* Activate a standard set of debugging hooks. */
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extern void __malloc_check_init __MALLOC_P ((void));
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#endif
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#ifdef __cplusplus
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}; /* end of extern "C" */
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#endif
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#endif /* malloc.h */
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