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version 3.2

/*************************************************************************
* (C) 2012 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
*  by Michael Pounov <misho@elwix.org>
*
* $Author: misho $
* $Id: ampool.h,v 1.3 2012/07/22 20:39:45 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#ifndef __AMPOOL_H
#define __AMPOOL_H


#include <pthread.h>


/* Memory pool */

#define MEM_BUCKETS	28	/* 32 bits - 4 bits = 28 items in bucket array */

struct tagAlloc {
	char			alloc_name[64];

	unsigned int		*alloc_mem;

	TAILQ_ENTRY(tagAlloc)	alloc_node;
};
typedef TAILQ_HEAD(, tagAlloc) mpool_bucket_t;

typedef struct _tagMPool {
	pthread_mutex_t	pool_mtx;

	struct {
		unsigned long alloc;
		unsigned long free;
		unsigned long cache;
	} pool_calls;
	struct {
		unsigned long alloc;
		unsigned long free;
		unsigned long cache;
	} pool_bytes;
	struct {
		unsigned long max;
		unsigned long curr;
	} pool_quota;

	/* pool buckets */
	mpool_bucket_t	pool_active[MEM_BUCKETS];
	mpool_bucket_t	pool_inactive[MEM_BUCKETS];
} mpool_t;
#define mpool_lock(x)	(assert((x)), pthread_mutex_lock(&(x)->pool_mtx))
#define mpool_unlock(x)	(assert((x)), pthread_mutex_unlock(&(x)->pool_mtx))

typedef void (*mpool_stat_cb)(unsigned int, unsigned int, unsigned int);

/* mpool functions */

/*
 * mpool_init() - Init memory pool
 *
 * @maxmem = If !=0 set maximum memory quota
 * return: =NULL error or !=NULL new allocated pool
 */
mpool_t *mpool_init(unsigned long maxmem);
/*
 * mpool_destroy() - Destroy memory pool
 *
 * @mp = Memory pool
 * return: none
 */
void mpool_destroy(mpool_t ** __restrict mp);
/*
 * mpool_purge() - Purge memory block cache and release resources
 *
 * @mp = Memory pool
 * @atmost = Free at most in buckets
 * return: -1 error or 0 ok
 */
int mpool_purge(mpool_t * __restrict mp, unsigned int atmost);
/*
 * mpool_malloc() - Memory allocation
 *
 * @mp = Memory pool
 * @size = Size
 * @memname = Optional memory block name
 * return: NULL error or !=NULL ok allocated memory
 */
void *mpool_malloc(mpool_t * __restrict mp, unsigned int size, const char *memname);
/*
 * mpool_free() Free allocated memory with mpool_alloc()
 *
 * @mp = Memory pool
 * @data = Allocated memory data
 * @purge = if !=0 force release memory block
 * return: <0 error or 0 ok released memory block
 */
int mpool_free(mpool_t * __restrict mp, void * __restrict data, int purge);
/*
 * mpool_free2() Free allocated memory with mpool_alloc() by size and memory name
 *
 * @mp = Memory pool
 * @size = Allocated memory data size
 * @memname = Memory name
 * @purge = if !=0 force release memory block
 * return: <0 error or 0 ok released memory block
 */
int mpool_free2(mpool_t * __restrict mp, unsigned int size, const char *memname, int purge);
/*
 * mpool_realloc() Reallocate memory block with new size
 *
 * @mp = Memory pool
 * @data = Allocated memory data
 * @newsize = New size of memory block
 * @memname = Optional new memory block name
 * return: NULL error or !=NULL new reallocated memory block
 */
void *mpool_realloc(mpool_t * __restrict mp, void * __restrict data, 
		unsigned int newsize, const char *memname);
/*
 * mpool_strdup() - String duplicate
 *
 * @mp = Memory pool
 * @str = String
 * @memname = Memory name
 * return: NULL error or !=NULL new string
 */
char *mpool_strdup(mpool_t * __restrict mp, const char *str, const char *memname);
/*
 * mpool_getmembynam() Find allocated memory block by size and memory name
 *
 * @mp = Memory pool
 * @size = Memory size
 * @memname = Memory name
 * return: NULL error or not found and !=NULL allocated memory 
 */
inline struct tagAlloc *mpool_getmembynam(mpool_t * __restrict mp, unsigned int size, const char *memname);
/*
 * mpool_getsizebyaddr() - Get size of allocated memory block by address
 *
 * @data = allocated memory from mpool_malloc()
 * return: usable size of allocated memory block
 */
inline unsigned int mpool_getsizebyaddr(void * __restrict data);
/*
 * mpool_chkaddr() - Check validity of given address
 *
 * @data = allocated memory from mpool_malloc()
 * return: -1 bad address, 1 corrupted address or 0 ok
 */
inline int mpool_chkaddr(void * __restrict data);
/*
 * mpool_setquota() - Change maximum memory quota
 *
 * @mp = Memory pool
 * @maxmem = New max quota size
 * return: old maximum memory quota size
 */
inline unsigned long mpool_setquota(mpool_t * __restrict mp, unsigned long maxmem);
/*
 * mpool_getquota() - Get memory quota
 *
 * @mp = Memory pool
 * @currmem = Return current memory
 * @maxmem = Return max quota size
 * return: none
 */
inline void mpool_getquota(mpool_t * __restrict mp, unsigned long *currmem, 
		unsigned long *maxmem);
/*
 * mpool_statistics() - Dump statistics from memory pool buckets
 *
 * @mp = Memory pool
 * @cb = Export statistics to callback
 * return: none
 */
void mpool_statistics(mpool_t * __restrict mp, mpool_stat_cb cb);


/* Wrappers */

/*
 * mpool_xmalloc() - malloc wrapper
 *
 * @size = Size
 * return: NULL error or !=NULL ok allocated memory
 */
void *mpool_xmalloc(size_t size);
/*
 * mpool_xcalloc() - calloc wrapper
 *
 * @num = number of elements
 * @size = Size of element
 * return: NULL error or !=NULL ok allocated memory
 */
void *mpool_xcalloc(size_t num, size_t size);
/*
 * mpool_xrealloc() - realloc wrapper
 *
 * @data = Allocated memory data
 * @newsize = New size of memory block
 * return: NULL error or !=NULL new reallocated memory block
 */
void *mpool_xrealloc(void * __restrict data, size_t newsize);
/*
 * mpool_xfree() - free wrapper
 *
 * @data = Allocated memory data
 * return: none
 */
void mpool_xfree(void * __restrict data);
/*
 * mpool_xstrdup() - strdup wrapper
 *
 * @str = string
 * return: =NULL error or !=NULL new allocated string
 */
char *mpool_xstrdup(const char *str);


#endif