Data Structures | |
| struct | memb_blocks |
Files | |
| file | memb.c |
| file | memb.h |
Defines | |
| #define | MEMB_CONCAT2(s1, s2) s1##s2 |
| #define | MEMB_CONCAT(s1, s2) MEMB_CONCAT2(s1, s2) |
| #define | MEMB(name, structure, num) |
Functions | |
| void | memb_init (struct memb_blocks *m) |
| void * | memb_alloc (struct memb_blocks *m) |
| char | memb_free (struct memb_blocks *m, void *ptr) |
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 uIP TCP/IP stack
Author: Adam Dunkels <adam@sics.se>
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.
The following example shows how to declare and use a memory block called "cmem" which has 8 chunks of memory with each memory chunk being 20 bytes large.
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 uIP TCP/IP stack
Author: Adam Dunkels <adam@sics.se>
| #define MEMB | ( | name, | ||
| structure, | ||||
| num | ||||
| ) |
static char MEMB_CONCAT(name,_memb_count)[num]; \ static structure MEMB_CONCAT(name,_memb_mem)[num]; \ static struct memb_blocks name = {sizeof(structure), num, \ MEMB_CONCAT(name,_memb_count), \ (void *)MEMB_CONCAT(name,_memb_mem)}
Declare a memory block.
This macro is used to staticall 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:
MEMB(connections, sizeof(struct connection), 16);
| name | The name of the memory block (later used with memb_init(), memb_alloc() and memb_free()). | |
| size | The size of each memory chunk, in bytes. | |
| num | The total number of memory chunks in the block. |
| void * memb_alloc | ( | struct memb_blocks * | m | ) |
| char memb_free | ( | struct memb_blocks * | m, | |
| void * | ptr | |||
| ) |
Deallocate a memory block from a memory block previously declared with MEMB().
| m | m A memory block previosly declared with MEMB(). | |
| ptr | A pointer to the memory block that is to be deallocated. |
| void memb_init | ( | struct memb_blocks * | m | ) |
1.7.1