Fix conflicts and merge into mainline (this may get cvs admined out and redone properly by Peter later)
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=14288
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/*-
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* Copyright (c) 1990, 1993
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* Copyright (c) 1990, 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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@ -30,7 +30,7 @@
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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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* @(#)db.h 8.4 (Berkeley) 2/21/94
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* @(#)db.h 8.7 (Berkeley) 6/16/94
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*/
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#ifndef _DB_H_
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include/mpool.h
106
include/mpool.h
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/*-
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* Copyright (c) 1991, 1993
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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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@ -30,101 +30,65 @@
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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 8.1 (Berkeley) 6/2/93
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* @(#)mpool.h 8.2 (Berkeley) 7/14/94
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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 three ways. All active pages are threaded
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* on a hash chain (hashed by the page number) and an lru chain. Inactive
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* pages are threaded on a free chain. Each reference to a memory pool is
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* handed an MPOOL which is the opaque cookie passed to all of the memory
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* routines.
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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)
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/* The BKT structures are the elements of the lists. */
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typedef struct BKT {
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struct BKT *hnext; /* next hash bucket */
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struct BKT *hprev; /* previous hash bucket */
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struct BKT *cnext; /* next free/lru bucket */
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struct BKT *cprev; /* previous free/lru bucket */
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/* The BKT structures are the elements of the queues. */
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typedef struct _bkt {
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CIRCLEQ_ENTRY(_bkt) hq; /* hash queue */
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CIRCLEQ_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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unsigned long flags; /* flags */
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u_int8_t flags; /* flags */
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} BKT;
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/* The BKTHDR structures are the heads of the lists. */
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typedef struct BKTHDR {
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struct BKT *hnext; /* next hash bucket */
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struct BKT *hprev; /* previous hash bucket */
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struct BKT *cnext; /* next free/lru bucket */
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struct BKT *cprev; /* previous free/lru bucket */
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} BKTHDR;
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typedef struct MPOOL {
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BKTHDR free; /* The free list. */
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BKTHDR lru; /* The LRU list. */
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BKTHDR hashtable[HASHSIZE]; /* Hashed list by page number. */
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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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u_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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CIRCLEQ_HEAD(_lqh, _bkt) lqh; /* lru queue head */
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/* hash queue array */
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CIRCLEQ_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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u_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) __P((void *, pgno_t, void *));
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/* Page out conversion routine. */
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/* page out conversion routine */
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void (*pgout) __P((void *, pgno_t, void *));
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void *pgcookie; /* Cookie for page in/out routines. */
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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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u_long cachehit;
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u_long cachemiss;
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u_long pagealloc;
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u_long pageflush;
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u_long pageget;
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u_long pagenew;
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u_long pageput;
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u_long pageread;
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u_long pagewrite;
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#endif
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} MPOOL;
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#ifdef __MPOOLINTERFACE_PRIVATE
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/* Macros to insert/delete into/from hash chain. */
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#define rmhash(bp) { \
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(bp)->hprev->hnext = (bp)->hnext; \
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(bp)->hnext->hprev = (bp)->hprev; \
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}
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#define inshash(bp, pg) { \
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hp = &mp->hashtable[HASHKEY(pg)]; \
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(bp)->hnext = hp->hnext; \
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(bp)->hprev = (struct BKT *)hp; \
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hp->hnext->hprev = (bp); \
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hp->hnext = (bp); \
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}
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/* Macros to insert/delete into/from lru and free chains. */
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#define rmchain(bp) { \
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(bp)->cprev->cnext = (bp)->cnext; \
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(bp)->cnext->cprev = (bp)->cprev; \
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}
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#define inschain(bp, dp) { \
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(bp)->cnext = (dp)->cnext; \
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(bp)->cprev = (struct BKT *)(dp); \
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(dp)->cnext->cprev = (bp); \
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(dp)->cnext = (bp); \
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}
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#endif
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__BEGIN_DECLS
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MPOOL *mpool_open __P((DBT *, int, pgno_t, pgno_t));
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MPOOL *mpool_open __P((void *, int, pgno_t, pgno_t));
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void mpool_filter __P((MPOOL *, void (*)(void *, pgno_t, void *),
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void (*)(void *, pgno_t, void *), void *));
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void *mpool_new __P((MPOOL *, pgno_t *));
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