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Overview
Comment: | Reorder structure fields to reduce code footprint. Ticket #1253. Need to do more of this. (CVS 2467) |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
27025613bc2970b0c23e08fbe5251103 |
User & Date: | drh 2005-05-20 20:11:21.000 |
Context
2005-05-21
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02:48 | More structure rearrangements for additional size reductions. Ticket #1253. (CVS 2468) (check-in: 6b6e525b29 user: drh tags: trunk) | |
2005-05-20
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20:11 | Reorder structure fields to reduce code footprint. Ticket #1253. Need to do more of this. (CVS 2467) (check-in: 27025613bc user: drh tags: trunk) | |
20:01 | Do not allow the pagesize of :memory: databases to be changed. Silently ignore PRAGMA page_size=N requests for :memory: databases. Ticket #1144 and #1252. (CVS 2466) (check-in: f29a1d8826 user: drh tags: trunk) | |
Changes
Changes to src/pager.c.
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14 15 16 17 18 19 20 | ** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** | | | 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | ** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** ** @(#) $Id: pager.c,v 1.204 2005/05/20 20:11:21 drh Exp $ */ #ifndef SQLITE_OMIT_DISKIO #include "sqliteInt.h" #include "os.h" #include "pager.h" #include <assert.h> #include <string.h> |
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238 239 240 241 242 243 244 | char *zJournal; /* Name of the journal file */ char *zDirectory; /* Directory hold database and journal files */ OsFile fd, jfd; /* File descriptors for database and journal */ OsFile stfd; /* File descriptor for the statement subjournal*/ int dbSize; /* Number of pages in the file */ int origDbSize; /* dbSize before the current change */ int stmtSize; /* Size of database (in pages) at stmt_begin() */ | < < < < < < < > < > > > > > > > | 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 | char *zJournal; /* Name of the journal file */ char *zDirectory; /* Directory hold database and journal files */ OsFile fd, jfd; /* File descriptors for database and journal */ OsFile stfd; /* File descriptor for the statement subjournal*/ int dbSize; /* Number of pages in the file */ int origDbSize; /* dbSize before the current change */ int stmtSize; /* Size of database (in pages) at stmt_begin() */ int nRec; /* Number of pages written to the journal */ u32 cksumInit; /* Quasi-random value added to every checksum */ int stmtNRec; /* Number of records in stmt subjournal */ int nExtra; /* Add this many bytes to each in-memory page */ int pageSize; /* Number of bytes in a page */ int nPage; /* Total number of in-memory pages */ int nMaxPage; /* High water mark of nPage */ int nRef; /* Number of in-memory pages with PgHdr.nRef>0 */ int mxPage; /* Maximum number of pages to hold in cache */ u8 journalOpen; /* True if journal file descriptors is valid */ u8 journalStarted; /* True if header of journal is synced */ u8 useJournal; /* Use a rollback journal on this file */ u8 noReadlock; /* Do not bother to obtain readlocks */ u8 stmtOpen; /* True if the statement subjournal is open */ u8 stmtInUse; /* True we are in a statement subtransaction */ u8 stmtAutoopen; /* Open stmt journal when main journal is opened*/ u8 noSync; /* Do not sync the journal if true */ u8 fullSync; /* Do extra syncs of the journal for robustness */ u8 state; /* PAGER_UNLOCK, _SHARED, _RESERVED, etc. */ u8 errMask; /* One of several kinds of errors */ u8 tempFile; /* zFilename is a temporary file */ u8 readOnly; /* True for a read-only database */ u8 needSync; /* True if an fsync() is needed on the journal */ u8 dirtyCache; /* True if cached pages have changed */ u8 alwaysRollback; /* Disable dont_rollback() for all pages */ u8 memDb; /* True to inhibit all file I/O */ u8 setMaster; /* True if a m-j name has been written to jrnl */ u8 *aInJournal; /* One bit for each page in the database file */ u8 *aInStmt; /* One bit for each page in the database */ BusyHandler *pBusyHandler; /* Pointer to sqlite.busyHandler */ PgHdr *pFirst, *pLast; /* List of free pages */ PgHdr *pFirstSynced; /* First free page with PgHdr.needSync==0 */ PgHdr *pAll; /* List of all pages */ PgHdr *pStmt; /* List of pages in the statement subjournal */ i64 journalOff; /* Current byte offset in the journal file */ i64 journalHdr; /* Byte offset to previous journal header */ i64 stmtHdrOff; /* First journal header written this statement */ i64 stmtCksum; /* cksumInit when statement was started */ i64 stmtJSize; /* Size of journal at stmt_begin() */ int sectorSize; /* Assumed sector size during rollback */ int nHit, nMiss, nOvfl; /* Cache hits, missing, and LRU overflows */ int nRead,nWrite; /* Database pages read/written */ void (*xDestructor)(void*,int); /* Call this routine when freeing pages */ void (*xReiniter)(void*,int); /* Call this routine when reloading pages */ void (*xCodec)(void*,void*,Pgno,int); /* Routine for en/decoding data */ void *pCodecArg; /* First argument to xCodec() */ PgHdr *aHash[N_PG_HASH]; /* Hash table to map page number to PgHdr */ }; /* ** These are bits that can be set in Pager.errMask. */ #define PAGER_ERR_FULL 0x01 /* a write() failed */ |
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