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/*
* Copyright 2010 Marek Olšák <maraeo@gmail.com>
* Copyright 2016 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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. */
/**
* Slab allocator for equally sized memory allocations.
* The thread-safe path ("*_mt" functions) is usually slower than malloc/free.
* The single-threaded path ("*_st" functions) is faster than malloc/free.
*/
#ifndef SLAB_H
#define SLAB_H
#include "c11/threads.h"
/* The page is an array of allocations in one block. */
struct slab_page_header {
/* The header (linked-list pointers). */
struct slab_page_header *prev, *next;
/* Memory after the last member is dedicated to the page itself.
* The allocated size is always larger than this structure.
*/
};
struct slab_mempool {
mtx_t mutex;
unsigned element_size;
unsigned num_elements;
struct slab_element_header *first_free;
struct slab_page_header list;
};
void slab_create(struct slab_mempool *pool,
unsigned item_size,
unsigned num_items);
void slab_destroy(struct slab_mempool *pool);
void *slab_alloc_st(struct slab_mempool *pool);
void slab_free_st(struct slab_mempool *pool, void *ptr);
void *slab_alloc_mt(struct slab_mempool *pool);
void slab_free_mt(struct slab_mempool *pool, void *ptr);
#endif
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