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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2008-2018. 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 thread safe hash table. Simular interface as hash.h
**
** Author: Sverker Eriksson
*/
#ifndef __SAFE_HASH_H__
#define __SAFE_HASH_H__
#include "sys.h"
#include "erl_alloc.h"
#include "erl_lock_flags.h"
typedef unsigned long SafeHashValue;
typedef int (*SHCMP_FUN)(void*, void*);
typedef SafeHashValue (*SH_FUN)(void*);
typedef void* (*SHALLOC_FUN)(void*);
typedef void (*SHFREE_FUN)(void*);
/*
** This bucket must be placed in top of
** every object that uses hashing!!!
** (Object*) == (Object*) &bucket
*/
typedef struct safe_hashbucket
{
struct safe_hashbucket* next; /* Next bucket */
SafeHashValue hvalue; /* Store hash value for get, rehash */
} SafeHashBucket;
typedef struct safe_hashfunctions
{
SH_FUN hash;
SHCMP_FUN cmp;
SHALLOC_FUN alloc;
SHFREE_FUN free;
} SafeHashFunctions;
typedef struct {
char *name;
int size;
int used;
int objs;
int depth;
} SafeHashInfo;
#define SAFE_HASH_LOCK_CNT 16
typedef struct
{
SafeHashFunctions fun; /* (C) Function block */
ErtsAlcType_t type; /* (C) */
char* name; /* (C) Table name (static, for debugging) */
int size_mask; /* (RW) Number of slots - 1 */
SafeHashBucket** tab; /* (RW) Vector of bucket pointers (objects) */
int grow_limit; /* (RW) Threshold for growing table */
erts_atomic_t nitems; /* (A) Number of items in table */
erts_atomic_t is_rehashing; /* (A) Table rehashing in progress */
union {
erts_mtx_t mtx;
byte __cache_line__[64];
}lock_vec[SAFE_HASH_LOCK_CNT];
/* C: Constants initialized once */
/* RW: One lock (or is_rehashing) to read and _all_ locks to write */
/* A: Lockless atomics */
} SafeHash;
SafeHash* safe_hash_init(ErtsAlcType_t, SafeHash*, char*, erts_lock_flags_t, int, SafeHashFunctions);
void safe_hash_get_info(SafeHashInfo*, SafeHash*);
int safe_hash_table_sz(SafeHash *);
void* safe_hash_get(SafeHash*, void*);
void* safe_hash_put(SafeHash*, void*);
void* safe_hash_erase(SafeHash*, void*);
void safe_hash_for_each(SafeHash*, void (*func)(void *, void *, void *), void *, void *);
#ifdef ERTS_ENABLE_LOCK_COUNT
void erts_lcnt_enable_hash_lock_count(SafeHash*, erts_lock_flags_t, int);
#endif
#endif /* __SAFE_HASH_H__ */
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