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/**
* @file memory_pool.h
* Header for memory pools
*
* Copyright (C) 2000 by Mike Perry.
* Distributed WITHOUT WARRANTY under the GPL. See COPYING for details.
*
*/
#ifndef __NJ_LIB_MEMORY_POOL_H__
#define __NJ_LIB_MEMORY_POOL_H__
#include <lib/libc_syms.h>
#include <lib/stack.h>
#include <lib/table.h>
#include <config.h>
/** Number of blocks of cache */
#define NJ_MP_CACHE_BLOCKS 4
/** Number of caches (one for each prot type) */
#define NJ_MP_NUM_CACHES 3
/**@{ @name Methods of protecting freed memory */
#define NJ_CHK_FREE_ERROR 0
#define NJ_CHK_FREE_SEGV 1
#define NJ_CHK_FREE_NONE 2
#define NJ_CHK_FREE_NOFREE 3
/*@}*/
/**@{ @name Allocation methods */
#define NJ_PROT_OVER 0
#define NJ_PROT_UNDER 1
#define NJ_PROT_SUNDER 2
#define NJ_PROT_NONE 3
#define NJ_PROT_UNKNOWN 7 /* 111 */
/*@}*/
/** The memory pool object */
struct nj_memory_pool
{
struct nj_table memory_tables; /**< The source of memory tables */
struct nj_stack block_cache[NJ_MP_NUM_CACHES][NJ_MP_CACHE_BLOCKS]; /**< The cache for blocks */
u_int first_table[NJ_MP_CACHE_BLOCKS]; /**< The first table with free blocks for each block size */
int fencepost_fd; /**< The fencepost file descriptor, for error check free */
void (*libc_free)(void *); /**< The libc free */
void *(*libc_malloc)(size_t); /**< Libc malloc */
};
/**
* Size of a table of memory. 32 megs for 32 bit processor, 128 megs for 64
* @FIXME: Change this as RAM gets cheaper/more abundant (it really should be
* an exponential fit, like 32 and 512)
*/
#define NJ_MEM_TABLE_MEGS (sizeof(void *)*24 - 64)
#define NJ_MEM_TABLE_SIZE (NJ_MEM_TABLE_MEGS << NJ_SHIFT_MEGABYTE)
/** Number of entries in the memory pool table (it's a table of tables) */
#define NJ_MP_TABLE_NENTRIES NJ_ROUND_TO_PAGE(NJ_ADDRESS_SIZE_32 / NJ_MEM_TABLE_SIZE + 1)
#define NJ_MP_TABLE_SIZE (NJ_MP_TABLE_NENTRIES*sizeof(struct nj_table_light))
nj_addr_t __nj_memory_pool_bootstrap_init(struct nj_memory_pool *memory_pool);
nj_addr_t __nj_memory_pool_user_init(struct nj_memory_pool *, struct nj_libc_syms *, struct nj_prefs *);
void __nj_memory_pool_fini(struct nj_memory_pool *);
void __nj_memory_pool_trim(struct nj_memory_pool *);
nj_addr_t __nj_memory_pool_request_block(struct nj_memory_pool *, size_t, struct nj_dynamic_prefs);
void __nj_memory_pool_release_block(struct nj_memory_pool *, nj_addr_t, size_t, int, int);
nj_addr_t __nj_memory_pool_resize_block(struct nj_memory_pool *, nj_addr_t,
size_t, size_t, int, int);
#endif /* memory_pool.h */
// vim:ts=4
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