mpool.h revision 1.13
1 1.13 joerg /* $NetBSD: mpool.h,v 1.13 2008/08/26 21:18:38 joerg Exp $ */ 2 1.6 cgd 3 1.1 proven /*- 4 1.7 cgd * Copyright (c) 1991, 1993, 1994 5 1.3 cgd * The Regents of the University of California. All rights reserved. 6 1.1 proven * 7 1.1 proven * Redistribution and use in source and binary forms, with or without 8 1.1 proven * modification, are permitted provided that the following conditions 9 1.1 proven * are met: 10 1.1 proven * 1. Redistributions of source code must retain the above copyright 11 1.1 proven * notice, this list of conditions and the following disclaimer. 12 1.1 proven * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 proven * notice, this list of conditions and the following disclaimer in the 14 1.1 proven * documentation and/or other materials provided with the distribution. 15 1.10 agc * 3. Neither the name of the University nor the names of its contributors 16 1.1 proven * may be used to endorse or promote products derived from this software 17 1.1 proven * without specific prior written permission. 18 1.1 proven * 19 1.1 proven * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 1.1 proven * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 1.1 proven * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 1.1 proven * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 1.1 proven * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 1.1 proven * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 1.1 proven * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 1.1 proven * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 1.1 proven * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 1.1 proven * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 1.1 proven * SUCH DAMAGE. 30 1.1 proven * 31 1.7 cgd * @(#)mpool.h 8.2 (Berkeley) 7/14/94 32 1.1 proven */ 33 1.1 proven 34 1.8 perry #ifndef _MPOOL_H_ 35 1.8 perry #define _MPOOL_H_ 36 1.8 perry 37 1.9 ad #include <sys/cdefs.h> 38 1.7 cgd #include <sys/queue.h> 39 1.7 cgd 40 1.1 proven /* 41 1.7 cgd * The memory pool scheme is a simple one. Each in-memory page is referenced 42 1.7 cgd * by a bucket which is threaded in up to two of three ways. All active pages 43 1.7 cgd * are threaded on a hash chain (hashed by page number) and an lru chain. 44 1.7 cgd * Inactive pages are threaded on a free chain. Each reference to a memory 45 1.7 cgd * pool is handed an opaque MPOOL cookie which stores all of this information. 46 1.1 proven */ 47 1.1 proven #define HASHSIZE 128 48 1.1 proven #define HASHKEY(pgno) ((pgno - 1) % HASHSIZE) 49 1.1 proven 50 1.7 cgd /* The BKT structures are the elements of the queues. */ 51 1.7 cgd typedef struct _bkt { 52 1.7 cgd CIRCLEQ_ENTRY(_bkt) hq; /* hash queue */ 53 1.7 cgd CIRCLEQ_ENTRY(_bkt) q; /* lru queue */ 54 1.7 cgd void *page; /* page */ 55 1.7 cgd pgno_t pgno; /* page number */ 56 1.1 proven 57 1.1 proven #define MPOOL_DIRTY 0x01 /* page needs to be written */ 58 1.1 proven #define MPOOL_PINNED 0x02 /* page is pinned into memory */ 59 1.12 perry uint8_t flags; /* flags */ 60 1.1 proven } BKT; 61 1.1 proven 62 1.1 proven typedef struct MPOOL { 63 1.7 cgd CIRCLEQ_HEAD(_lqh, _bkt) lqh; /* lru queue head */ 64 1.7 cgd /* hash queue array */ 65 1.7 cgd CIRCLEQ_HEAD(_hqh, _bkt) hqh[HASHSIZE]; 66 1.7 cgd pgno_t curcache; /* current number of cached pages */ 67 1.7 cgd pgno_t maxcache; /* max number of cached pages */ 68 1.7 cgd pgno_t npages; /* number of pages in the file */ 69 1.13 joerg unsigned long pagesize; /* file page size */ 70 1.7 cgd int fd; /* file descriptor */ 71 1.7 cgd /* page in conversion routine */ 72 1.11 perry void (*pgin)(void *, pgno_t, void *); 73 1.7 cgd /* page out conversion routine */ 74 1.11 perry void (*pgout)(void *, pgno_t, void *); 75 1.7 cgd void *pgcookie; /* cookie for page in/out routines */ 76 1.1 proven #ifdef STATISTICS 77 1.13 joerg unsigned long cachehit; 78 1.13 joerg unsigned long cachemiss; 79 1.13 joerg unsigned long pagealloc; 80 1.13 joerg unsigned long pageflush; 81 1.13 joerg unsigned long pageget; 82 1.13 joerg unsigned long pagenew; 83 1.13 joerg unsigned long pageput; 84 1.13 joerg unsigned long pageread; 85 1.13 joerg unsigned long pagewrite; 86 1.1 proven #endif 87 1.1 proven } MPOOL; 88 1.1 proven 89 1.1 proven __BEGIN_DECLS 90 1.11 perry MPOOL *mpool_open(void *, int, pgno_t, pgno_t); 91 1.11 perry void mpool_filter(MPOOL *, void (*)(void *, pgno_t, void *), 92 1.11 perry void (*)(void *, pgno_t, void *), void *); 93 1.11 perry void *mpool_new(MPOOL *, pgno_t *); 94 1.13 joerg void *mpool_get(MPOOL *, pgno_t, unsigned int); 95 1.13 joerg int mpool_put(MPOOL *, void *, unsigned int); 96 1.11 perry int mpool_sync(MPOOL *); 97 1.11 perry int mpool_close(MPOOL *); 98 1.1 proven #ifdef STATISTICS 99 1.11 perry void mpool_stat(MPOOL *); 100 1.1 proven #endif 101 1.1 proven __END_DECLS 102 1.8 perry 103 1.8 perry #endif /* _MPOOL_H_ */ 104
Indexes created Mon Sep 22 13:09:51 GMT 2025