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https://github.com/google/pebble
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47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "util/order.h"
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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typedef uint32_t KeyedCircularCacheKey;
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//! Array-backed circular cache, optimized for data cache efficiency
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typedef struct {
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KeyedCircularCacheKey *cache_keys;
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uint8_t *cache_data; //<! Pointer to the array
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size_t item_size; //<! Size of the array element in bytes
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size_t next_item_to_erase_idx; //<! Next array element to be deleted
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size_t total_items;
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} KeyedCircularCache;
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void keyed_circular_cache_init(KeyedCircularCache *c, KeyedCircularCacheKey *key_buffer,
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void *data_buffer, size_t item_size, size_t total_items);
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//! @return Pointer to buffer of entry in cache that contains the data
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//! @note Item must be of size item_size
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void *keyed_circular_cache_get(KeyedCircularCache *c, KeyedCircularCacheKey key);
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//! Push data of size item_size into the circular cache
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//! Overwrites the item at next_item_to_erase_idx
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void keyed_circular_cache_push(KeyedCircularCache *c, KeyedCircularCacheKey key,
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const void *item);
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