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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
* 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.
*/
#ifndef included_dlist_h
#define included_dlist_h
#include <stdarg.h>
#include <vppinfra/clib.h>
#include <vppinfra/vec.h>
#include <vppinfra/pool.h>
#include <vppinfra/error.h>
#include <vppinfra/format.h>
#include <vppinfra/cache.h>
typedef struct
{
u32 next;
u32 prev;
u32 value;
} dlist_elt_t;
static inline void
clib_dlist_init (dlist_elt_t * pool, u32 index)
{
dlist_elt_t *head = pool_elt_at_index (pool, index);
clib_memset (head, 0xFF, sizeof (*head));
}
static inline void
clib_dlist_addtail (dlist_elt_t * pool, u32 head_index, u32 new_index)
{
dlist_elt_t *head = pool_elt_at_index (pool, head_index);
u32 old_last_index;
dlist_elt_t *old_last;
dlist_elt_t *new;
ASSERT (head->value == ~0);
new = pool_elt_at_index (pool, new_index);
if (PREDICT_FALSE (head->next == ~0))
{
head->next = head->prev = new_index;
new->next = new->prev = head_index;
return;
}
old_last_index = head->prev;
old_last = pool_elt_at_index (pool, old_last_index);
new->next = old_last->next;
new->prev = old_last_index;
old_last->next = new_index;
head->prev = new_index;
}
static inline void
clib_dlist_addhead (dlist_elt_t * pool, u32 head_index, u32 new_index)
{
dlist_elt_t *head = pool_elt_at_index (pool, head_index);
dlist_elt_t *old_first;
u32 old_first_index;
dlist_elt_t *new;
ASSERT (head->value == ~0);
new = pool_elt_at_index (pool, new_index);
if (PREDICT_FALSE (head->next == ~0))
{
head->next = head->prev = new_index;
new->next = new->prev = head_index;
return;
}
old_first_index = head->next;
old_first = pool_elt_at_index (pool, old_first_index);
new->next = old_first_index;
new->prev = old_first->prev;
old_first->prev = new_index;
head->next = new_index;
}
static inline void
clib_dlist_remove (dlist_elt_t * pool, u32 index)
{
dlist_elt_t *elt = pool_elt_at_index (pool, index);
dlist_elt_t *next_elt, *prev_elt;
/* listhead, not so much */
ASSERT (elt->value != ~0);
next_elt = pool_elt_at_index (pool, elt->next);
prev_elt = pool_elt_at_index (pool, elt->prev);
next_elt->prev = elt->prev;
prev_elt->next = elt->next;
elt->prev = elt->next = ~0;
}
static inline u32
clib_dlist_remove_head (dlist_elt_t * pool, u32 head_index)
{
dlist_elt_t *head = pool_elt_at_index (pool, head_index);
u32 rv;
ASSERT (head->value == ~0);
if (head->next == ~0 || (head->next == head_index))
return ~0;
rv = head->next;
clib_dlist_remove (pool, rv);
return rv;
}
static inline u32
clib_dlist_remove_tail (dlist_elt_t * pool, u32 head_index)
{
dlist_elt_t *head = pool_elt_at_index (pool, head_index);
u32 rv;
ASSERT (head->value == ~0);
if (head->prev == ~0)
return ~0;
rv = head->prev;
clib_dlist_remove (pool, rv);
return rv;
}
#endif /* included_dlist_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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