2006-06-17 22:41:10 +00:00
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/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \addtogroup mem
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* @{
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*/
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/**
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* \defgroup mmem Managed memory allocator
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*
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* The managed memory allocator is a fragmentation-free memory
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* manager. It keeps the allocated memory free from fragmentation by
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* compacting the memory when blocks are freed. A program that uses
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* the managed memory module cannot be sure that allocated memory
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* stays in place. Therefore, a level of indirection is used: access
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* to allocated memory must always be done using a special macro.
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*
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* \note This module has not been heavily tested.
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* @{
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*/
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/**
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* \file
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* Header file for the managed memory allocator
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* \author
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* Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef __MMEM_H__
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#define __MMEM_H__
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Get a pointer to the managed memory
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* \param m A pointer to the struct mmem
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* \return A pointer to the memory block, or NULL if memory could
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2008-10-15 14:17:28 +00:00
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* not be allocated.
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2006-06-17 22:41:10 +00:00
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* \author Adam Dunkels
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*
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* This macro is used to get a pointer to a memory block
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* allocated with mmem_alloc().
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*
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* \hideinitializer
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*/
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#define MMEM_PTR(m) (struct mmem *)(m)->ptr
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struct mmem {
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struct mmem *next;
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unsigned int size;
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void *ptr;
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};
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/* XXX: tagga minne med "interrupt usage", vilke g<>r att man <20>r
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speciellt varsam under free(). */
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int mmem_alloc(struct mmem *m, unsigned int size);
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void mmem_free(struct mmem *);
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void mmem_init(void);
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#endif /* __MMEM_H__ */
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/** @} */
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/** @} */
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