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/*
* Copyright (c) 2011 Intel Corporation. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#if !defined(INDEXER_H)
#define INDEXER_H
#include <config.h>
#include <stddef.h>
#include <sys/types.h>
/*
* Indexer - to find a structure given an index. Synchronization
* must be provided by the caller. Caller must initialize the
* indexer by setting free_list and size to 0.
*/
union idx_entry {
void *item;
int next;
};
#define IDX_INDEX_BITS 16
#define IDX_ENTRY_BITS 10
#define IDX_ENTRY_SIZE (1 << IDX_ENTRY_BITS)
#define IDX_ARRAY_SIZE (1 << (IDX_INDEX_BITS - IDX_ENTRY_BITS))
#define IDX_MAX_INDEX ((1 << IDX_INDEX_BITS) - 1)
struct indexer
{
union idx_entry *array[IDX_ARRAY_SIZE];
int free_list;
int size;
};
#define idx_array_index(index) (index >> IDX_ENTRY_BITS)
#define idx_entry_index(index) (index & (IDX_ENTRY_SIZE - 1))
int idx_insert(struct indexer *idx, void *item);
void *idx_remove(struct indexer *idx, int index);
void idx_replace(struct indexer *idx, int index, void *item);
static inline void *idx_at(struct indexer *idx, int index)
{
return (idx->array[idx_array_index(index)] + idx_entry_index(index))->item;
}
/*
* Index map - associates a structure with an index. Synchronization
* must be provided by the caller. Caller must initialize the
* index map by setting it to 0.
*/
struct index_map
{
void **array[IDX_ARRAY_SIZE];
};
int idm_set(struct index_map *idm, int index, void *item);
void *idm_clear(struct index_map *idm, int index);
static inline void *idm_at(struct index_map *idm, int index)
{
void **entry;
entry = idm->array[idx_array_index(index)];
return entry[idx_entry_index(index)];
}
static inline void *idm_lookup(struct index_map *idm, int index)
{
return ((index <= IDX_MAX_INDEX) && idm->array[idx_array_index(index)]) ?
idm_at(idm, index) : NULL;
}
typedef struct _dlist_entry {
struct _dlist_entry *next;
struct _dlist_entry *prev;
} dlist_entry;
static inline void dlist_init(dlist_entry *head)
{
head->next = head;
head->prev = head;
}
static inline int dlist_empty(dlist_entry *head)
{
return head->next == head;
}
static inline void dlist_insert_after(dlist_entry *item, dlist_entry *head)
{
item->next = head->next;
item->prev = head;
head->next->prev = item;
head->next = item;
}
static inline void dlist_insert_before(dlist_entry *item, dlist_entry *head)
{
dlist_insert_after(item, head->prev);
}
#define dlist_insert_head dlist_insert_after
#define dlist_insert_tail dlist_insert_before
static inline void dlist_remove(dlist_entry *item)
{
item->prev->next = item->next;
item->next->prev = item->prev;
}
#endif /* INDEXER_H */
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