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Diffstat (limited to 'lib/libc/db/PORT/include/mpool.h')
| -rw-r--r-- | lib/libc/db/PORT/include/mpool.h | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/lib/libc/db/PORT/include/mpool.h b/lib/libc/db/PORT/include/mpool.h deleted file mode 100644 index 910e0782aa9d..000000000000 --- a/lib/libc/db/PORT/include/mpool.h +++ /dev/null @@ -1,135 +0,0 @@ -/*- - * Copyright (c) 1991, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)mpool.h 8.1 (Berkeley) 6/2/93 - */ - -/* - * The memory pool scheme is a simple one. Each in memory page is referenced - * by a bucket which is threaded in three ways. All active pages are threaded - * on a hash chain (hashed by the page number) and an lru chain. Inactive - * pages are threaded on a free chain. Each reference to a memory pool is - * handed an MPOOL which is the opaque cookie passed to all of the memory - * routines. - */ -#define HASHSIZE 128 -#define HASHKEY(pgno) ((pgno - 1) % HASHSIZE) - -/* The BKT structures are the elements of the lists. */ -typedef struct BKT { - struct BKT *hnext; /* next hash bucket */ - struct BKT *hprev; /* previous hash bucket */ - struct BKT *cnext; /* next free/lru bucket */ - struct BKT *cprev; /* previous free/lru bucket */ - void *page; /* page */ - pgno_t pgno; /* page number */ - -#define MPOOL_DIRTY 0x01 /* page needs to be written */ -#define MPOOL_PINNED 0x02 /* page is pinned into memory */ - unsigned long flags; /* flags */ -} BKT; - -/* The BKTHDR structures are the heads of the lists. */ -typedef struct BKTHDR { - struct BKT *hnext; /* next hash bucket */ - struct BKT *hprev; /* previous hash bucket */ - struct BKT *cnext; /* next free/lru bucket */ - struct BKT *cprev; /* previous free/lru bucket */ -} BKTHDR; - -typedef struct MPOOL { - BKTHDR free; /* The free list. */ - BKTHDR lru; /* The LRU list. */ - BKTHDR hashtable[HASHSIZE]; /* Hashed list by page number. */ - pgno_t curcache; /* Current number of cached pages. */ - pgno_t maxcache; /* Max number of cached pages. */ - pgno_t npages; /* Number of pages in the file. */ - u_long pagesize; /* File page size. */ - int fd; /* File descriptor. */ - /* Page in conversion routine. */ - void (*pgin) __P((void *, pgno_t, void *)); - /* Page out conversion routine. */ - void (*pgout) __P((void *, pgno_t, void *)); - void *pgcookie; /* Cookie for page in/out routines. */ -#ifdef STATISTICS - unsigned long cachehit; - unsigned long cachemiss; - unsigned long pagealloc; - unsigned long pageflush; - unsigned long pageget; - unsigned long pagenew; - unsigned long pageput; - unsigned long pageread; - unsigned long pagewrite; -#endif -} MPOOL; - -#ifdef __MPOOLINTERFACE_PRIVATE -/* Macros to insert/delete into/from hash chain. */ -#define rmhash(bp) { \ - (bp)->hprev->hnext = (bp)->hnext; \ - (bp)->hnext->hprev = (bp)->hprev; \ -} -#define inshash(bp, pg) { \ - hp = &mp->hashtable[HASHKEY(pg)]; \ - (bp)->hnext = hp->hnext; \ - (bp)->hprev = (struct BKT *)hp; \ - hp->hnext->hprev = (bp); \ - hp->hnext = (bp); \ -} - -/* Macros to insert/delete into/from lru and free chains. */ -#define rmchain(bp) { \ - (bp)->cprev->cnext = (bp)->cnext; \ - (bp)->cnext->cprev = (bp)->cprev; \ -} -#define inschain(bp, dp) { \ - (bp)->cnext = (dp)->cnext; \ - (bp)->cprev = (struct BKT *)(dp); \ - (dp)->cnext->cprev = (bp); \ - (dp)->cnext = (bp); \ -} -#endif - -__BEGIN_DECLS -MPOOL *mpool_open __P((DBT *, int, pgno_t, pgno_t)); -void mpool_filter __P((MPOOL *, void (*)(void *, pgno_t, void *), - void (*)(void *, pgno_t, void *), void *)); -void *mpool_new __P((MPOOL *, pgno_t *)); -void *mpool_get __P((MPOOL *, pgno_t, u_int)); -int mpool_put __P((MPOOL *, void *, u_int)); -int mpool_sync __P((MPOOL *)); -int mpool_close __P((MPOOL *)); -#ifdef STATISTICS -void mpool_stat __P((MPOOL *)); -#endif -__END_DECLS |