ncx_mempool
Description
a nginx-based memory pool .
both share-memory and private-memory are supported. it is more efficient than malloc.
it is a very light weight and do not rely on any third-party library.
Examples
1 #include "ncx_slab.h"
2
3 int main(int argc, char **argv)
4 {
5 char *p;
6 size_t pool_size = 4096000; //4M
7 ncx_slab_stat_t stat;
8 u_char *space;
9 space = (u_char *)malloc(pool_size);
10
11 ncx_slab_pool_t *sp;
12 sp = (ncx_slab_pool_t*) space;
13
14 sp->addr = space;
15 sp->min_shift = 3;
16 sp->end = space + pool_size;
17
18 /*
19 * init
20 */
21 ncx_slab_init(sp);
22
23 /*
24 * alloc
25 */
26 p = ncx_slab_alloc(sp, 128);
27
28 /*
29 * memory usage api.
30 */
31 ncx_slab_stat(sp, &stat);
32
33 /*
34 * free
35 */
36 ncx_slab_free(sp, p);
37
38 free(space);
39
40 return 0;
41}
API
*ncx_slab_init(ncx_slab_pool_t pool)
Description: 初始化内存池结构；
ncx_slab_alloc(ncx_slab_pool_t *pool, size_t size)
Description: 内存分配
**ncx_slab_free(ncx_slab_pool_t pool, void p)
Description: 释放内存
ncx_slab_stat(ncx_slab_pool_t *pool, ncx_slab_stat_t *stat)
Description: 查看内存池使用情况
Customization
正如example所示，内存池内存是由应用层先分配，ncx_mempool是在给定的内存基础上进行分配和回收管理。
所以内存池本身不关心所管理的内存是私有内存 or 共享内存;
ncx_lock.h 是锁接口；根据实际需要重定义:
1.多线程共享内存池，可参考pthread_spin_lock
2.多进程共享内存池，可参考nginx的ngx_shmtx.c实现spin lock
3.单进程单线程使用内存池，无锁编程..
ncx_log.h 是日志接口，根据实际需要重定义.
ncx_slab.c.orz 是 ncx_slab.c的详细注释，方便理解.
Author
dcshi(施俊伟) [email protected]
Copyright and License
This module is licensed under the BSD license. Copyright (C) 2013, by dcshi(施俊伟). [email protected] All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
-
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
-
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.
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