malloc_funcs.h

减少内存碎片的malloc分配函数

/*
 * Function prototypes for the malloc user level routines.
 *
 * Copyright 2000 by Gray Watson
 *
 * This file is part of the dmalloc package.
 *
 * Permission to use, copy, modify, and distribute this software for
 * any purpose and without fee is hereby granted, provided that the
 * above copyright notice and this permission notice appear in all
 * copies, and that the name of Gray Watson not be used in advertising
 * or publicity pertaining to distribution of the document or software
 * without specific, written prior permission.
 *
 * Gray Watson makes no representations about the suitability of the
 * software described herein for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * The author may be contacted via http://www.dmalloc.com/
 *
 * $Id: malloc_funcs.h,v 1.1 2000/11/07 17:33:03 gray Exp $
 */

#ifndef __MALLOC_H__
#define __MALLOC_H__

/*<<<<<<<<<<  The below prototypes are auto-generated by fillproto */

/*
 * Shutdown memory-allocation module, provide statistics if necessary
 */
extern
void	_dmalloc_shutdown(void);

#if FINI_DMALLOC
/*
 * Automatic OSF function to close dmalloc.  Pretty cool OS/compiler
 * hack.  By default it is not necessary because we use atexit() and
 * on_exit() to register the close functions.  These are more
 * portable.
 */
extern
void	__fini_dmalloc();
#endif /* if FINI_DMALLOC */

/*
 * Allocate and return a SIZE block of bytes.  FUNC_ID contains the
 * type of function.  If we are aligning our malloc then ALIGNMENT is
 * greater than 0.
 *
 * Returns 0L on error.
 */
extern
DMALLOC_PNT	_loc_malloc(const char *file, const int line,
			    const DMALLOC_SIZE size, const int func_id,
			    const DMALLOC_SIZE alignment);

/*
 * Resizes OLD_PNT to NEW_SIZE bytes and return the new space after
 * either copying all of OLD_PNT to the new area or truncating.  If
 * OLD_PNT is 0L then it will do the equivalent of malloc(NEW_SIZE).
 * If NEW_SIZE is 0 and OLD_PNT is not 0L then it will do the
 * equivalent of free(OLD_PNT) and will return 0L.  If the RECALLOC_B
 * flag is enabled, it will zero any new memory.
 *
 * Returns 0L on error.
 */
extern
DMALLOC_PNT	_loc_realloc(const char *file, const int line,
			     DMALLOC_PNT old_pnt, DMALLOC_SIZE new_size,
			     const int func_id);

/*
 * Release PNT in the heap.
 *
 * Returns FREE_ERROR, FREE_NOERROR.
 */
extern
int	_loc_free(const char *file, const int line, DMALLOC_PNT pnt);

/*
 * Allocate and return a SIZE block of bytes.
 *
 * Returns 0L on error.
 */
extern
DMALLOC_PNT	malloc(DMALLOC_SIZE size);

/*
 * Allocate and return a block of _zeroed_ bytes able to hold
 * NUM_ELEMENTS, each element contains SIZE bytes.
 *
 * Returns 0L on error.
 */
extern
DMALLOC_PNT	calloc(DMALLOC_SIZE num_elements, DMALLOC_SIZE size);

/*
 * Resizes OLD_PNT to NEW_SIZE bytes and return the new space after
 * either copying all of OLD_PNT to the new area or truncating.  If
 * OLD_PNT is 0L then it will do the equivalent of malloc(NEW_SIZE).
 * If NEW_SIZE is 0 and OLD_PNT is not 0L then it will do the
 * equivalent of free(OLD_PNT) and will return 0L.
 *
 * Returns 0L on error.
 */
extern
DMALLOC_PNT	realloc(DMALLOC_PNT old_pnt, DMALLOC_SIZE new_size);

/*
 * Resizes OLD_PNT to NEW_SIZE bytes and return the new space after
 * either copying all of OLD_PNT to the new area or truncating.  If
 * OLD_PNT is 0L then it will do the equivalent of malloc(NEW_SIZE).
 * If NEW_SIZE is 0 and OLD_PNT is not 0L then it will do the
 * equivalent of free(OLD_PNT) and will return 0L.  Any extended
 * memory space will be zeroed like calloc.
 *
 * Returns 0L on error.
 */
extern
DMALLOC_PNT	recalloc(DMALLOC_PNT old_pnt, DMALLOC_SIZE new_size);

/*
 * Allocate and return a SIZE block of bytes that has been aligned to
 * ALIGNMENT bytes.  ALIGNMENT must be a power of two and must be less
 * than or equal to the block-size.
 *
 * Returns 0L on error.
 */
extern
DMALLOC_PNT	memalign(DMALLOC_SIZE alignment, DMALLOC_SIZE size);

/*
 * Allocate and return a SIZE block of bytes that has been aligned to
 * a page-size.
 *
 * Returns 0L on error.
 */
extern
DMALLOC_PNT	valloc(DMALLOC_SIZE size);

#ifndef DMALLOC_STRDUP_MACRO
/*
 * Allocate and return a block of bytes that contains the string STR
 * including the \0.
 *
 * Returns 0L on error.
 */
extern
char	*strdup(const char *str);
#endif /* ifndef DMALLOC_STRDUP_MACRO */

/*
 * Release PNT in the heap.
 *
 * Returns FREE_ERROR, FREE_NOERROR or void depending on whether STDC
 * is defined by your compiler.
 */
extern
DMALLOC_FREE_RET	free(DMALLOC_PNT pnt);

/*
 * same as free PNT
 */
extern
DMALLOC_FREE_RET	cfree(DMALLOC_PNT pnt);

/*
 * Log the heap structure plus information on the blocks if necessary.
 */
extern
void	_dmalloc_log_heap_map(const char *file, const int line);

/*
 * Dump dmalloc statistics to logfile.
 */
extern
void	_dmalloc_log_stats(const char *file, const int line);

/*
 * Dump unfreed-memory info to logfile.
 */
extern
void	_dmalloc_log_unfreed(const char *file, const int line);

/*
 * Verify pointer PNT, if PNT is 0 then check the entire heap.
 *
 * Returns MALLOC_VERIFY_ERROR or MALLOC_VERIFY_NOERROR
 */
extern
int	_dmalloc_verify(const char *file, const int line,
			const DMALLOC_PNT pnt);

/*
 * Verify pointer PNT, if PNT is 0 then check the entire heap.
 *
 * Returns MALLOC_VERIFY_ERROR or MALLOC_VERIFY_NOERROR
 */
extern
int	malloc_verify(const DMALLOC_PNT pnt);

/*
 * Set the global debug functionality FLAGS (0 to disable all
 * debugging).
 *
 * NOTE: you cannot remove certain flags such as signal handlers since
 * they are setup at initialization time only.  Also you cannot add
 * certain flags such as fence-post or free-space checking since they
 * must be on from the start.
 *
 * Returns the old debug flag value.
 */
extern
unsigned int	_dmalloc_debug(const unsigned int flags);

/*
 * Returns the current debug functionality flags.  This allows you to
 * save a dmalloc library state to be restored later.
 */
extern
unsigned int	_dmalloc_debug_current(void);

/*
 * int _dmalloc_examine
 *
 * DESCRIPTION:
 *
 * Examine a pointer and return information on its allocation size as
 * well as the file and line-number where it was allocated.  If the
 * file and line number is not available, then it will return the
 * allocation location's return-address if available.
 *
 * RETURNS:
 *
 * Success - DMALLOC_NOERROR
 *
 * Failure - DMALLOC_ERROR
 *
 * ARGUMENTS:
 *
 * file -> File were we are examining the pointer.
 *
 * line -> Line-number from where we are examining the pointer.
 *
 * pnt -> Pointer we are checking.
 *
 * size_p <- Pointer to an unsigned int which, if not NULL, will be
 * set to the size of bytes from the pointer.
 *
 * file_p <- Pointer to a character pointer which, if not NULL, will
 * be set to the file where the pointer was allocated.
 *
 * line_p <- Pointer to a character pointer which, if not NULL, will
 * be set to the line-number where the pointer was allocated.
 *
 * ret_attr_p <- Pointer to a void pointer, if not NULL, will be set
 * to the return-address where the pointer was allocated.
 */
extern
int	_dmalloc_examine(const char *file, const int line,
			 const DMALLOC_PNT pnt, DMALLOC_SIZE *size_p,
			 char **file_p, unsigned int *line_p,
			 DMALLOC_PNT *ret_attr_p);

/*
 * Register an allocation tracking function which will be called each
 * time an allocation occurs.  Pass in NULL to disable.
 */
extern
void	_dmalloc_track(const dmalloc_track_t track_func);

/*
 * Return to the caller the current ``mark'' which can be used later
 * to dmalloc_log_changed pointers since this point.  Multiple marks
 * can be saved and used.
 */
extern
unsigned long	_dmalloc_mark(void);

/*
 * Dump the pointers that have changed since the mark which was
 * returned by dmalloc_mark.  If not_freed_b is set to non-0 then log
 * the new pointers that are non-freed.  If free_b is set to non-0
 * then log the new pointers that are freed.  If details_b set to
 * non-0 then dump the individual pointers that have changed otherwise
 * just dump the summaries.
 */
extern
void	_dmalloc_log_changed(const char *file, const int line,
			     const unsigned long mark, const int not_freed_b,
			     const int free_b, const int details_b);

/*
 * Dmalloc version of strerror to return the string version of
 * ERROR_NUM.
 *
 * Returns an invaid errno string if ERROR_NUM is out-of-range.
 */
extern
const char	*_dmalloc_strerror(const int error_num);

/*<<<<<<<<<<   This is end of the auto-generated output from fillproto. */

#endif /* ! __MALLOC_H__ */