2 * Copyright (c) 2004, Swedish Institute of Computer Science.
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3 * All rights reserved.
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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13 * 3. Neither the name of the Institute nor the names of its contributors
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14 * may be used to endorse or promote products derived from this software
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15 * without specific prior written permission.
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17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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29 * This file is part of the Contiki operating system.
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31 * Author: Adam Dunkels <adam@sics.se>
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33 * $Id: memb.h,v 1.6 2009/04/06 21:18:04 adamdunkels Exp $
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42 * \defgroup memb Memory block management functions
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44 * The memory block allocation routines provide a simple yet powerful
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45 * set of functions for managing a set of memory blocks of fixed
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46 * size. A set of memory blocks is statically declared with the
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47 * MEMB() macro. Memory blocks are allocated from the declared
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48 * memory by the memb_alloc() function, and are deallocated with the
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49 * memb_free() function.
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56 * Memory block allocation routines.
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58 * Adam Dunkels <adam@sics.se>
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67 * Declare a memory block.
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69 * This macro is used to statically declare a block of memory that can
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70 * be used by the block allocation functions. The macro statically
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71 * declares a C array with a size that matches the specified number of
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72 * blocks and their individual sizes.
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76 MEMB(connections, struct connection, 16);
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79 * \param name The name of the memory block (later used with
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80 * memb_init(), memb_alloc() and memb_free()).
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82 * \param structure The name of the struct that the memory block holds
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84 * \param num The total number of memory chunks in the block.
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87 #define MEMB( name, structure, num ) \
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88 static char CC_CONCAT( name, _memb_count )[num]; \
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89 static structure CC_CONCAT( name, _memb_mem )[num]; \
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90 static struct memb name = \
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92 sizeof( structure ), num, CC_CONCAT( name, _memb_count ), ( void * ) CC_CONCAT( name, _memb_mem ) \
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96 { unsigned short size; unsigned short num; char *count; void *mem; };
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99 * Initialize a memory block that was declared with MEMB().
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101 * \param m A memory block previously declared with MEMB().
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103 void memb_init( struct memb *m );
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106 * Allocate a memory block from a block of memory declared with MEMB().
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108 * \param m A memory block previously declared with MEMB().
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110 void *memb_alloc( struct memb *m );
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113 * Deallocate a memory block from a memory block previously declared
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116 * \param m m A memory block previously declared with MEMB().
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118 * \param ptr A pointer to the memory block that is to be deallocated.
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120 * \return The new reference count for the memory block (should be 0
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121 * if successfully deallocated) or -1 if the pointer "ptr" did not
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122 * point to a legal memory block.
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124 char memb_free( struct memb *m, void *ptr );
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126 int memb_inmemb( struct memb *m, void *ptr );
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131 #endif /* __MEMB_H__ */
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