myvtm/Framework/libtoolkit/q_malloc.h

/* $Id: q_malloc.h 5897 2009-07-20 14:52:34Z bogdan_iancu $
 *
 * simple & fast malloc library
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of opensips, a free SIP server.
 *
 * opensips is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * opensips 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * --------
 *  2003-05-21  on sparc64 roundto 8 even in debugging mode (so malloc'ed
 *               long longs will be 64 bit aligned) (andrei)
 *  2004-07-19  support for 64 bit (2^64 mem. block) and more info
 *               for the future de-fragmentation support (andrei)
 *  2004-11-10  support for > 4Gb mem. (switched to long) (andrei)
 */


#if !defined(q_malloc_h)
#define q_malloc_h

#ifdef __cplusplus
extern "C" {
#endif

#include "config.h"

/* defs*/
#ifdef NO_FIXED_ADDR
//#define RELATIVE_ADDR //there are no help between different processes
#endif // NO_FIXED_ADDR

/* size we round to, must be = 2^n  
and also sizeof(qm_frag)+sizeof(qm_frag_end) must be multiple of ROUNDTO!*/
#define ROUNDTO		16UL 

#define MIN_FRAG_SIZE	ROUNDTO

#define QM_MALLOC_OPTIMIZE_FACTOR 14UL /*used below */
#define QM_MALLOC_OPTIMIZE  ((unsigned long)(1UL<<QM_MALLOC_OPTIMIZE_FACTOR))
								/* size to optimize for,
									(most allocs <= this size),
									must be 2^k */

#define QM_HASH_SIZE ((unsigned long)(QM_MALLOC_OPTIMIZE/ROUNDTO + \
		(sizeof(long)*8-QM_MALLOC_OPTIMIZE_FACTOR)+1))

/* hash structure:
 * 0 .... QM_MALLOC_OPTIMIE/ROUNDTO  - small buckets, size increases with
 *                            ROUNDTO from bucket to bucket
 * +1 .... end -  size = 2^k, big buckets */

struct qm_frag{
	unsigned long size;
	union{
		struct qm_frag* nxt_free;
		long is_free;
	}u;
};

struct qm_frag_end{
	unsigned long size;
	struct qm_frag* prev_free;
};

struct qm_frag_lnk{
	struct qm_frag head;
	struct qm_frag_end tail;
	unsigned long no;
};


struct qm_block{
	unsigned long size; /* total size */
	unsigned long used; /* alloc'ed size*/
	unsigned long real_used; /* used+malloc overhead*/
	unsigned long max_real_used;
	
	struct qm_frag* first_frag;
	struct qm_frag_end* last_frag_end;
	
	struct qm_frag_lnk free_hash[QM_HASH_SIZE];
	/*struct qm_frag_end free_lst_end;*/

	long lock;
	void *user_data[8];
};

/* init malloc and return a qm_block*/
struct qm_block* qm_malloc_init(char* address, unsigned long size, int newcreate);

void* qm_malloc(struct qm_block*, unsigned long size);
void  qm_free(struct qm_block*, void* p);

void qm_lock(struct qm_block*);
void qm_unlock(struct qm_block*);

void qm_set_user_data(struct qm_block* qm, int idx, void* user_data);
void* qm_get_user_data(struct qm_block* qm, int idx);

#ifdef __cplusplus
} // extern "C" {
#endif


#endif