139 lines
4.2 KiB
C
139 lines
4.2 KiB
C
/*
|
|
* Copyright (c) 2004, Swedish Institute of Computer Science.
|
|
* 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.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
* Author: Adam Dunkels <adam@sics.se>
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \addtogroup mem
|
|
* @{
|
|
*/
|
|
|
|
|
|
/**
|
|
* \defgroup memb memb: Memory block management functions
|
|
*
|
|
* The memory block allocation routines provide a simple yet powerful
|
|
* set of functions for managing a set of memory blocks of fixed
|
|
* size. A set of memory blocks is statically declared with the
|
|
* MEMB() macro. Memory blocks are allocated from the declared
|
|
* memory by the memb_alloc() function, and are deallocated with the
|
|
* memb_free() function.
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
|
|
/**
|
|
* \file
|
|
* Memory block allocation routines.
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*
|
|
*/
|
|
|
|
#ifndef MEMB_H_
|
|
#define MEMB_H_
|
|
|
|
#include "sys/cc.h"
|
|
|
|
/**
|
|
* Declare a memory block.
|
|
*
|
|
* This macro is used to statically declare a block of memory that can
|
|
* be used by the block allocation functions. The macro statically
|
|
* declares a C array with a size that matches the specified number of
|
|
* blocks and their individual sizes.
|
|
*
|
|
* Example:
|
|
\code
|
|
MEMB(connections, struct connection, 16);
|
|
\endcode
|
|
*
|
|
* \param name The name of the memory block (later used with
|
|
* memb_init(), memb_alloc() and memb_free()).
|
|
*
|
|
* \param structure The name of the struct that the memory block holds
|
|
*
|
|
* \param num The total number of memory chunks in the block.
|
|
*
|
|
*/
|
|
#define MEMB(name, structure, num) \
|
|
static char CC_CONCAT(name,_memb_count)[num]; \
|
|
static structure CC_CONCAT(name,_memb_mem)[num]; \
|
|
static struct memb name = {sizeof(structure), num, \
|
|
CC_CONCAT(name,_memb_count), \
|
|
(void *)CC_CONCAT(name,_memb_mem)}
|
|
|
|
struct memb {
|
|
unsigned short size;
|
|
unsigned short num;
|
|
char *count;
|
|
void *mem;
|
|
};
|
|
|
|
/**
|
|
* Initialize a memory block that was declared with MEMB().
|
|
*
|
|
* \param m A memory block previously declared with MEMB().
|
|
*/
|
|
void memb_init(struct memb *m);
|
|
|
|
/**
|
|
* Allocate a memory block from a block of memory declared with MEMB().
|
|
*
|
|
* \param m A memory block previously declared with MEMB().
|
|
*/
|
|
void *memb_alloc(struct memb *m);
|
|
|
|
/**
|
|
* Deallocate a memory block from a memory block previously declared
|
|
* with MEMB().
|
|
*
|
|
* \param m m A memory block previously declared with MEMB().
|
|
*
|
|
* \param ptr A pointer to the memory block that is to be deallocated.
|
|
*
|
|
* \return The new reference count for the memory block (should be 0
|
|
* if successfully deallocated) or -1 if the pointer "ptr" did not
|
|
* point to a legal memory block.
|
|
*/
|
|
char memb_free(struct memb *m, void *ptr);
|
|
|
|
int memb_inmemb(struct memb *m, void *ptr);
|
|
|
|
int memb_numfree(struct memb *m);
|
|
|
|
/** @} */
|
|
/** @} */
|
|
|
|
#endif /* MEMB_H_ */
|