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/* $OpenBSD: mpool.h,v 1.11 2013/12/02 02:28:21 krw Exp $ */ |
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/* $NetBSD: mpool.h,v 1.7 1996/05/03 21:13:41 cgd Exp $ */ |
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/*- |
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* Copyright (c) 1991, 1993, 1994 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* @(#)mpool.h 8.4 (Berkeley) 11/2/95 |
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*/ |
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#ifndef _MPOOL_H_ |
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#define _MPOOL_H_ |
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#include <sys/queue.h> |
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/* |
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* The memory pool scheme is a simple one. Each in-memory page is referenced |
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* by a bucket which is threaded in up to two of three ways. All active pages |
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* are threaded on a hash chain (hashed by page number) and an lru chain. |
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* Inactive pages are threaded on a free chain. Each reference to a memory |
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* pool is handed an opaque MPOOL cookie which stores all of this information. |
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*/ |
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#define HASHSIZE 128 |
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#define HASHKEY(pgno) ((pgno - 1 + HASHSIZE) % HASHSIZE) |
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/* The BKT structures are the elements of the queues. */ |
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typedef struct _bkt { |
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TAILQ_ENTRY(_bkt) hq; /* hash queue */ |
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TAILQ_ENTRY(_bkt) q; /* lru queue */ |
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void *page; /* page */ |
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pgno_t pgno; /* page number */ |
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#define MPOOL_DIRTY 0x01 /* page needs to be written */ |
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#define MPOOL_PINNED 0x02 /* page is pinned into memory */ |
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#define MPOOL_INUSE 0x04 /* page address is valid */ |
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u_int8_t flags; /* flags */ |
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} BKT; |
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typedef struct MPOOL { |
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TAILQ_HEAD(_lqh, _bkt) lqh; /* lru queue head */ |
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/* hash queue array */ |
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TAILQ_HEAD(_hqh, _bkt) hqh[HASHSIZE]; |
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pgno_t curcache; /* current number of cached pages */ |
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pgno_t maxcache; /* max number of cached pages */ |
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pgno_t npages; /* number of pages in the file */ |
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unsigned long pagesize; /* file page size */ |
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int fd; /* file descriptor */ |
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/* page in conversion routine */ |
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void (*pgin)(void *, pgno_t, void *); |
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/* page out conversion routine */ |
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void (*pgout)(void *, pgno_t, void *); |
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void *pgcookie; /* cookie for page in/out routines */ |
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#ifdef STATISTICS |
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unsigned long cachehit; |
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unsigned long cachemiss; |
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unsigned long pagealloc; |
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unsigned long pageflush; |
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unsigned long pageget; |
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unsigned long pagenew; |
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unsigned long pageput; |
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unsigned long pageread; |
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unsigned long pagewrite; |
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#endif |
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} MPOOL; |
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#define MPOOL_IGNOREPIN 0x01 /* Ignore if the page is pinned. */ |
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#define MPOOL_PAGE_REQUEST 0x01 /* Allocate a new page with a |
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specific page number. */ |
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#define MPOOL_PAGE_NEXT 0x02 /* Allocate a new page with the next |
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page number. */ |
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__BEGIN_DECLS |
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MPOOL *mpool_open(void *, int, pgno_t, pgno_t); |
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void mpool_filter(MPOOL *, void (*)(void *, pgno_t, void *), |
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void (*)(void *, pgno_t, void *), void *); |
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void *mpool_new(MPOOL *, pgno_t *, unsigned int); |
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void *mpool_get(MPOOL *, pgno_t, unsigned int); |
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int mpool_delete(MPOOL *, void *); |
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int mpool_put(MPOOL *, void *, unsigned int); |
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int mpool_sync(MPOOL *); |
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int mpool_close(MPOOL *); |
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#ifdef STATISTICS |
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void mpool_stat(MPOOL *); |
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#endif |
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__END_DECLS |
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#endif |