mirror of
https://github.com/signalwire/freeswitch.git
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Anthony Minessale
117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/*
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* Memory pool local defines.
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*
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* Copyright 1996 by Gray Watson.
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*
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* This file is part of the mpool package.
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*
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the
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* above copyright notice and this permission notice appear in all
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* copies, and that the name of Gray Watson not be used in advertising
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* or publicity pertaining to distribution of the document or software
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* without specific, written prior permission.
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*
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* Gray Watson makes no representations about the suitability of the
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* software described herein for any purpose. It is provided "as is"
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* without express or implied warranty.
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*
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* The author may be reached via http://256.com/gray/
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*
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* $Id: mpool_loc.h,v 1.2 2005/05/20 20:08:54 gray Exp $
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*/
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#ifndef __MPOOL_LOC_H__
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#define __MPOOL_LOC_H__
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#define MPOOL_MAGIC 0xABACABA /* magic for struct */
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#define BLOCK_MAGIC 0xB1B1007 /* magic for blocks */
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#define FENCE_MAGIC0 (unsigned char)(0xFAU) /* 1st magic mem byte */
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#define FENCE_MAGIC1 (unsigned char)(0xD3U) /* 2nd magic mem byte */
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#define FENCE_SIZE 2 /* fence space */
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#define MIN_ALLOCATION (sizeof(mpool_free_t)) /* min alloc */
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#define MAX_FREE_SEARCH 10240 /* max size to search */
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#define MAX_FREE_LIST_SEARCH 100 /* max looking for free mem */
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/*
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* bitflag tools for Variable and a Flag
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*/
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#define BIT_FLAG(x) (1 << (x))
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#define BIT_SET(v,f) (v) |= (f)
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#define BIT_CLEAR(v,f) (v) &= ~(f)
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#define BIT_IS_SET(v,f) ((v) & (f))
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#define BIT_TOGGLE(v,f) (v) ^= (f)
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#define SET_POINTER(pnt, val) \
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do { \
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if ((pnt) != NULL) { \
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(*(pnt)) = (val); \
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} \
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} while(0)
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#define BLOCK_FLAG_USED BIT_FLAG(0) /* block is used */
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#define BLOCK_FLAG_FREE BIT_FLAG(1) /* block is free */
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#define DEFAULT_PAGE_MULT 16 /* pagesize = this * getpagesize*/
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/* How many pages SIZE bytes resides in. We add in the block header. */
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#define PAGES_IN_SIZE(mp_p, size) (((size) + sizeof(mpool_block_t) + \
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(mp_p)->mp_page_size - 1) / \
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(mp_p)->mp_page_size)
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#define SIZE_OF_PAGES(mp_p, page_n) ((page_n) * (mp_p)->mp_page_size)
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#define MAX_BITS 30 /* we only can allocate 1gb chunks */
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#define MAX_BLOCK_USER_MEMORY(mp_p) ((mp_p)->mp_page_size - \
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sizeof(mpool_block_t))
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#define FIRST_ADDR_IN_BLOCK(block_p) (void *)((char *)(block_p) + \
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sizeof(mpool_block_t))
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#define MEMORY_IN_BLOCK(block_p) ((char *)(block_p)->mb_bounds_p - \
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((char *)(block_p) + \
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sizeof(mpool_block_t)))
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typedef struct {
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unsigned int mp_magic; /* magic number for struct */
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unsigned int mp_flags; /* flags for the struct */
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unsigned long mp_alloc_c; /* number of allocations */
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unsigned long mp_user_alloc; /* user bytes allocated */
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unsigned long mp_max_alloc; /* maximum user bytes allocated */
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unsigned int mp_page_c; /* number of pages allocated */
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unsigned int mp_max_pages; /* maximum number of pages to use */
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unsigned int mp_page_size; /* page-size of our system */
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int mp_fd; /* fd for /dev/zero if mmap-ing */
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off_t mp_top; /* top of our allocations in fd */
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mpool_log_func_t mp_log_func; /* log callback function */
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void *mp_addr; /* current address for mmaping */
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void *mp_min_p; /* min address in pool for checks */
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void *mp_bounds_p; /* max address in pool for checks */
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struct mpool_block_st *mp_first_p; /* first memory block we are using */
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struct mpool_block_st *mp_last_p; /* last memory block we are using */
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struct mpool_block_st *mp_free[MAX_BITS + 1]; /* free lists based on size */
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unsigned int mp_magic2; /* upper magic for overwrite sanity */
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} mpool_t;
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/* for debuggers to be able to interrogate the generic type in the .h file */
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typedef mpool_t mpool_ext_t;
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/*
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* Block header structure. This structure *MUST* be long-word
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* aligned.
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*/
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typedef struct mpool_block_st {
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unsigned int mb_magic; /* magic number for block header */
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void *mb_bounds_p; /* block boundary location */
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struct mpool_block_st *mb_next_p; /* linked list next pointer */
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unsigned int mb_magic2; /* upper magic for overwrite sanity */
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} mpool_block_t;
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/*
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* Free list structure.
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*/
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typedef struct {
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void *mf_next_p; /* pointer to the next free address */
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unsigned long mf_size; /* size of the free block */
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} mpool_free_t;
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#endif /* ! __MPOOL_LOC_H__ */
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