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/*
* Copyright (c) 2021 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.
*/
/**
* \file pool.c
* \brief Implementation of fixed-size pool allocator.
*
* NOTE:
* - Ideally, we should have a single realloc per resize, that would encompass
* both the free indices vector and bitmap, by nesting data structures.
* Because of the added complexity, and by lack of evidence of the need for
* this, we currently rely on a simpler implementation.
*/
#include <assert.h>
#include <stdlib.h> // calloc
#include <hicn/util/pool.h>
#include <stdio.h> // XXX
void
_pool_init (void **pool_ptr, size_t elt_size, size_t init_size,
size_t max_size)
{
assert (pool_ptr);
assert (elt_size);
init_size = next_pow2 (init_size);
if (max_size && init_size > max_size)
goto ERR_MAX_SIZE;
/* The initial pool size is rounded to the next power of two */
size_t alloc_size = next_pow2 (init_size);
pool_hdr_t *ph = calloc (POOL_HDRLEN + alloc_size * elt_size, 1);
if (!ph)
goto ERR_MALLOC;
ph->elt_size = elt_size;
ph->alloc_size = alloc_size;
ph->max_size = max_size;
/* Free indices */
off_t *free_indices;
vector_init (free_indices, init_size, max_size);
for (unsigned i = 0; i < init_size; i++)
free_indices[i] = (init_size - 1) - i;
vector_len (free_indices) = init_size;
ph->free_indices = free_indices;
/* Free bitmap */
bitmap_t *fb = ph->free_bitmap;
bitmap_init (fb, init_size, max_size);
bitmap_set_to (fb, init_size);
ph->free_bitmap = fb;
*pool_ptr = (uint8_t *) ph + POOL_HDRLEN;
return;
ERR_MALLOC:
ERR_MAX_SIZE:
*pool_ptr = NULL;
return;
}
void
_pool_free (void **pool_ptr)
{
pool_hdr_t *ph = pool_hdr (*pool_ptr);
vector_free (ph->free_indices);
bitmap_free (ph->free_bitmap);
free (pool_hdr (*pool_ptr));
*pool_ptr = NULL;
}
bool
_pool_validate_id (void **pool_ptr, off_t id)
{
pool_hdr_t *ph = pool_hdr (*pool_ptr);
size_t pool_size = pool_get_alloc_size (*pool_ptr);
if (id >= pool_size || !bitmap_is_unset (ph->free_bitmap, id))
return false;
return true;
}
void
_pool_resize (void **pool_ptr, size_t elt_size)
{
pool_hdr_t *ph = pool_hdr (*pool_ptr);
size_t old_size = ph->alloc_size;
size_t new_size = old_size * 2;
WARN ("pool_resize to %lu", new_size);
if (ph->max_size && new_size > ph->max_size)
goto ERR_MAX_SIZE;
/* Double pool storage */
ph = realloc (ph, POOL_HDRLEN + new_size * elt_size);
if (!ph)
goto ERR_REALLOC;
ph->elt_size = elt_size;
ph->alloc_size = new_size;
/*
* After resize, the pool will have new free indices, ranging from
* old_size to (new_size - 1)
*/
vector_ensure_pos (ph->free_indices, old_size);
for (unsigned i = 0; i < old_size; i++)
ph->free_indices[i] = new_size - 1 - i;
vector_len (ph->free_indices) = old_size;
/* We also need to update the bitmap */
bitmap_ensure_pos (&(ph->free_bitmap), new_size - 1);
bitmap_set_range (ph->free_bitmap, old_size, new_size - 1);
/* Reassign pool pointer */
*pool_ptr = (uint8_t *) ph + POOL_HDRLEN;
return;
ERR_REALLOC:
ERR_MAX_SIZE:
*pool_ptr = NULL;
return;
}
off_t
_pool_get (void **pool_ptr, void **elt, size_t elt_size)
{
pool_hdr_t *ph = pool_hdr (*pool_ptr);
uint64_t l = vector_len (ph->free_indices);
if (l == 0)
{
_pool_resize (pool_ptr, elt_size);
ph = pool_hdr (*pool_ptr);
l = vector_len (ph->free_indices);
}
off_t free_id = ph->free_indices[l - 1];
vector_len (ph->free_indices)--;
bitmap_unset (ph->free_bitmap, free_id);
*elt = *pool_ptr + free_id * elt_size;
return free_id;
}
void
_pool_put (void **pool_ptr, void **elt, size_t elt_size)
{
pool_hdr_t *ph = pool_hdr (*pool_ptr);
uint64_t l = vector_len (ph->free_indices);
vector_ensure_pos (ph->free_indices, l);
off_t freed_id = (*elt - *pool_ptr) / elt_size;
ph->free_indices[l] = freed_id;
vector_len (ph->free_indices)++;
bitmap_set (ph->free_bitmap, freed_id);
}
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