erl_goodfit_alloc.h

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/* ``The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved via the world wide web at http://www.erlang.org/.
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 * 
 * The Initial Developer of the Original Code is Ericsson Utvecklings AB.
 * Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
 * AB. All Rights Reserved.''
 * 
 *     $Id$
 */


#ifndef ERL_GOODFIT_ALLOC__
#define ERL_GOODFIT_ALLOC__

#include "erl_alloc_util.h"

#define ERTS_ALC_GF_ALLOC_VSN_STR "2.1"

typedef struct GFAllctr_t_ GFAllctr_t;

typedef struct {
    Uint mbsd;
} GFAllctrInit_t;

#define ERTS_DEFAULT_GF_ALLCTR_INIT {                                      \
    3,			/* (amount) mbsd:   max (mbc) block search depth */\
}

void erts_gfalc_init(void);
Allctr_t *erts_gfalc_start(GFAllctr_t *, GFAllctrInit_t *, AllctrInit_t *);

#endif /* #ifndef ERL_GOODFIT_ALLOC__ */



#if defined(GET_ERL_GF_ALLOC_IMPL) && !defined(ERL_GF_ALLOC_IMPL__)
#define ERL_GF_ALLOC_IMPL__

#define GET_ERL_ALLOC_UTIL_IMPL
#include "erl_alloc_util.h"

#define NO_OF_BKT_IX_BITS (8)
#ifdef ARCH_64
#  define SUB_MASK_IX_SHIFT (6)
#else
#  define SUB_MASK_IX_SHIFT (5)
#endif
#define NO_OF_BKTS (((Uint) 1) << NO_OF_BKT_IX_BITS)
#define NO_OF_SUB_MASKS (NO_OF_BKTS/(((Uint) 1) << SUB_MASK_IX_SHIFT))

typedef struct {
    Uint main;
    Uint sub[NO_OF_SUB_MASKS];
} BucketMask_t; 

typedef struct GFFreeBlock_t_ GFFreeBlock_t;
struct GFFreeBlock_t_ {
    Block_t block_head;
    GFFreeBlock_t *prev;
    GFFreeBlock_t *next;
};

struct GFAllctr_t_ {
    Allctr_t		allctr; /* Has to be first! */

    char *		last_aux_mbc_start;
    char *		last_aux_mbc_end;
    Uint		bkt_max_size_d;
    Uint		bkt_intrvl_d;
    BucketMask_t	bucket_mask;
    GFFreeBlock_t *	buckets[NO_OF_BKTS];
    Uint 		max_blk_search;

};

unsigned long erts_gfalc_test(unsigned long, unsigned long, unsigned long);

#endif /* #if defined(GET_ERL_GF_ALLOC_IMPL)
	      && !defined(ERL_GF_ALLOC_IMPL__) */