solanum-vs-hackint-and-char.../libcharybdis/balloc.h
nenolod 212380e3f4 [svn] - the new plan:
+ branches/release-2.1 -> 2.2 base
  + 3.0 -> branches/cxxconversion
  + backport some immediate 3.0 functionality for 2.2
  + other stuff
2007-01-24 22:40:21 -08:00

112 lines
3.1 KiB
C

/*
* ircd-ratbox: A slightly useful ircd.
* balloc.h: The ircd block allocator header.
*
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2004 ircd-ratbox development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* $Id: balloc.h 1781 2006-07-30 18:07:38Z jilles $
*/
#ifndef INCLUDED_blalloc_h
#define INCLUDED_blalloc_h
#include "setup.h"
#include "tools.h"
#include "memory.h"
#include "ircd_defs.h"
#define CACHEFILE_HEAP_SIZE 32
#define CACHELINE_HEAP_SIZE 64
#ifdef NOBALLOC
typedef struct BlockHeap BlockHeap;
#define initBlockHeap()
#define BlockHeapGarbageCollect(x)
#define BlockHeapCreate(es, epb) ((BlockHeap*)(es))
#define BlockHeapDestroy(x)
#define BlockHeapAlloc(x) MyMalloc((int)x)
#define BlockHeapFree(x,y) MyFree(y)
#define BlockHeapUsage(bh, bused, bfree, bmemusage) do { if (bused) (*(size_t *)bused) = 0; if (bfree) *((size_t *)bfree) = 0; if (bmemusage) *((size_t *)bmemusage) = 0; } while(0)
typedef struct MemBlock
{
void *dummy;
} MemBlock;
#else
#undef DEBUG_BALLOC
#ifdef DEBUG_BALLOC
#define BALLOC_MAGIC 0x3d3a3c3d
#define BALLOC_FREE_MAGIC 0xafafafaf
#endif
/* status information for an allocated block in heap */
struct Block
{
size_t alloc_size;
struct Block *next; /* Next in our chain of blocks */
void *elems; /* Points to allocated memory */
dlink_list free_list;
dlink_list used_list;
};
typedef struct Block Block;
struct MemBlock
{
#ifdef DEBUG_BALLOC
unsigned long magic;
#endif
dlink_node self;
Block *block; /* Which block we belong to */
};
typedef struct MemBlock MemBlock;
/* information for the root node of the heap */
struct BlockHeap
{
dlink_node hlist;
size_t elemSize; /* Size of each element to be stored */
unsigned long elemsPerBlock; /* Number of elements per block */
unsigned long blocksAllocated; /* Number of blocks allocated */
unsigned long freeElems; /* Number of free elements */
Block *base; /* Pointer to first block */
};
typedef struct BlockHeap BlockHeap;
extern int BlockHeapFree(BlockHeap * bh, void *ptr);
extern void *BlockHeapAlloc(BlockHeap * bh);
extern BlockHeap *BlockHeapCreate(size_t elemsize, int elemsperblock);
extern int BlockHeapDestroy(BlockHeap * bh);
extern void initBlockHeap(void);
extern void BlockHeapUsage(BlockHeap * bh, size_t * bused, size_t * bfree, size_t * bmemusage);
#endif /* NOBALLOC */
#endif /* INCLUDED_blalloc_h */