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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2009. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
** General hash functions
**
*/
#ifndef __HASH_H__
#define __HASH_H__
#ifndef __SYS_H__
#include "sys.h"
#endif
#include "erl_alloc.h"
typedef unsigned long HashValue;
typedef int (*HCMP_FUN)(void*, void*);
typedef HashValue (*H_FUN)(void*);
typedef void* (*HALLOC_FUN)(void*);
typedef void (*HFREE_FUN)(void*);
/*
** This bucket must be placed in top of
** every object that uses hashing!!!
** (Object*) == (Object*) &bucket
*/
typedef struct hash_bucket
{
struct hash_bucket* next; /* Next bucket */
HashValue hvalue; /* Store hash value for get, rehash */
} HashBucket;
typedef struct hash_functions
{
H_FUN hash;
HCMP_FUN cmp;
HALLOC_FUN alloc;
HFREE_FUN free;
} HashFunctions;
typedef struct {
char *name;
int size;
int used;
int objs;
int depth;
} HashInfo;
typedef struct hash
{
HashFunctions fun; /* Function block */
int is_allocated; /* 0 iff hash structure is on stack or is static */
ErtsAlcType_t type;
char* name; /* Table name (static string, for debugging) */
int size; /* Number of slots */
int shrink_threshold;
int grow_threshold;
int size_ix; /* Size index in size table */
int min_size_ix; /* Never shrink table smaller than this */
int nobjs; /* Number of objects in table */
HashBucket** bucket; /* Vector of bucket pointers (objects) */
} Hash;
Hash* hash_new(ErtsAlcType_t, char*, int, HashFunctions);
Hash* hash_init(ErtsAlcType_t, Hash*, char*, int, HashFunctions);
void hash_delete(Hash*);
void hash_get_info(HashInfo*, Hash*);
void hash_info(int, void *, Hash*);
int hash_table_sz(Hash *);
void* hash_get(Hash*, void*);
void* hash_put(Hash*, void*);
void* hash_erase(Hash*, void*);
void* hash_remove(Hash*, void*);
void hash_foreach(Hash*, void (*func)(void *, void *), void *);
#endif
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