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/*
* Copyright (c) 2010, Andrea Mazzoleni. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/** \file
* Allocator of fixed size blocks.
*/
#ifndef __TOMMYALLOC_H
#define __TOMMYALLOC_H
#include "tommytypes.h"
/******************************************************************************/
/* allocator */
/** \internal
* Allocator entry.
*/
struct tommy_allocator_entry_struct {
struct tommy_allocator_entry_struct* next; /**< Pointer to the next entry. 0 for last. */
};
typedef struct tommy_allocator_entry_struct tommy_allocator_entry;
/**
* Allocator of fixed size blocks.
*/
typedef struct tommy_allocator_struct {
struct tommy_allocator_entry_struct* free_block; /**< List of free blocks. */
struct tommy_allocator_entry_struct* used_segment; /**< List of allocated segments. */
tommy_size_t block_size; /**< Block size. */
tommy_size_t align_size; /**< Alignment size. */
tommy_count_t count; /**< Number of allocated elements. */
} tommy_allocator;
/**
* Initializes the allocator.
* \param alloc Allocator to initialize.
* \param block_size Size of the block to allocate.
* \param align_size Minimum alignment requirement. No less than sizeof(void*).
*/
void tommy_allocator_init(tommy_allocator* alloc, tommy_size_t block_size, tommy_size_t align_size);
/**
* Deinitialize the allocator.
* It also releases all the allocated memory to the heap.
* \param alloc Allocator to deinitialize.
*/
void tommy_allocator_done(tommy_allocator* alloc);
/**
* Allocates a block.
* \param alloc Allocator to use.
*/
void* tommy_allocator_alloc(tommy_allocator* alloc);
/**
* Deallocates a block.
* You must use the same allocator used in the tommy_allocator_alloc() call.
* \param alloc Allocator to use.
* \param ptr Block to free.
*/
void tommy_allocator_free(tommy_allocator* alloc, void* ptr);
/**
* Gets the size of allocated memory.
* \param alloc Allocator to use.
*/
tommy_size_t tommy_allocator_memory_usage(tommy_allocator* alloc);
#endif
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