Mercurial > trustbridge > nss-cmake-static
comparison nss/lib/dbm/include/mpool.h @ 3:150b72113545
Add DBM and legacydb support
| author | Andre Heinecke <andre.heinecke@intevation.de> |
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| date | Tue, 05 Aug 2014 18:32:02 +0200 |
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| 2:a945361df361 | 3:150b72113545 |
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| 1 /*- | |
| 2 * Copyright (c) 1991, 1993, 1994 | |
| 3 * The Regents of the University of California. All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions | |
| 7 * are met: | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * 3. ***REMOVED*** - see | |
| 14 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change | |
| 15 * 4. Neither the name of the University nor the names of its contributors | |
| 16 * may be used to endorse or promote products derived from this software | |
| 17 * without specific prior written permission. | |
| 18 * | |
| 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 29 * SUCH DAMAGE. | |
| 30 * | |
| 31 * @(#)mpool.h 8.2 (Berkeley) 7/14/94 | |
| 32 */ | |
| 33 | |
| 34 #include <sys/queue.h> | |
| 35 | |
| 36 /* | |
| 37 * The memory pool scheme is a simple one. Each in-memory page is referenced | |
| 38 * by a bucket which is threaded in up to two of three ways. All active pages | |
| 39 * are threaded on a hash chain (hashed by page number) and an lru chain. | |
| 40 * Inactive pages are threaded on a free chain. Each reference to a memory | |
| 41 * pool is handed an opaque MPOOL cookie which stores all of this information. | |
| 42 */ | |
| 43 #define HASHSIZE 128 | |
| 44 #define HASHKEY(pgno) ((pgno - 1) % HASHSIZE) | |
| 45 | |
| 46 /* The BKT structures are the elements of the queues. */ | |
| 47 typedef struct _bkt { | |
| 48 CIRCLEQ_ENTRY(_bkt) hq; /* hash queue */ | |
| 49 CIRCLEQ_ENTRY(_bkt) q; /* lru queue */ | |
| 50 void *page; /* page */ | |
| 51 pgno_t pgno; /* page number */ | |
| 52 | |
| 53 #define MPOOL_DIRTY 0x01 /* page needs to be written */ | |
| 54 #define MPOOL_PINNED 0x02 /* page is pinned into memory */ | |
| 55 uint8 flags; /* flags */ | |
| 56 } BKT; | |
| 57 | |
| 58 typedef struct MPOOL { | |
| 59 CIRCLEQ_HEAD(_lqh, _bkt) lqh; /* lru queue head */ | |
| 60 /* hash queue array */ | |
| 61 CIRCLEQ_HEAD(_hqh, _bkt) hqh[HASHSIZE]; | |
| 62 pgno_t curcache; /* current number of cached pages */ | |
| 63 pgno_t maxcache; /* max number of cached pages */ | |
| 64 pgno_t npages; /* number of pages in the file */ | |
| 65 uint32 pagesize; /* file page size */ | |
| 66 int fd; /* file descriptor */ | |
| 67 /* page in conversion routine */ | |
| 68 void (*pgin) (void *, pgno_t, void *); | |
| 69 /* page out conversion routine */ | |
| 70 void (*pgout) (void *, pgno_t, void *); | |
| 71 void *pgcookie; /* cookie for page in/out routines */ | |
| 72 #ifdef STATISTICS | |
| 73 uint32 cachehit; | |
| 74 uint32 cachemiss; | |
| 75 uint32 pagealloc; | |
| 76 uint32 pageflush; | |
| 77 uint32 pageget; | |
| 78 uint32 pagenew; | |
| 79 uint32 pageput; | |
| 80 uint32 pageread; | |
| 81 uint32 pagewrite; | |
| 82 #endif | |
| 83 } MPOOL; | |
| 84 | |
| 85 __BEGIN_DECLS | |
| 86 MPOOL *mpool_open (void *, int, pgno_t, pgno_t); | |
| 87 void mpool_filter (MPOOL *, void (*)(void *, pgno_t, void *), | |
| 88 void (*)(void *, pgno_t, void *), void *); | |
| 89 void *mpool_new (MPOOL *, pgno_t *); | |
| 90 void *mpool_get (MPOOL *, pgno_t, uint); | |
| 91 int mpool_put (MPOOL *, void *, uint); | |
| 92 int mpool_sync (MPOOL *); | |
| 93 int mpool_close (MPOOL *); | |
| 94 #ifdef STATISTICS | |
| 95 void mpool_stat (MPOOL *); | |
| 96 #endif | |
| 97 __END_DECLS |