pager.h.svn-base
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- /*
- ** 2001 September 15
- **
- ** The author disclaims copyright to this source code. In place of
- ** a legal notice, here is a blessing:
- **
- ** May you do good and not evil.
- ** May you find forgiveness for yourself and forgive others.
- ** May you share freely, never taking more than you give.
- **
- *************************************************************************
- ** This header file defines the interface that the sqlite page cache
- ** subsystem. The page cache subsystem reads and writes a file a page
- ** at a time and provides a journal for rollback.
- **
- ** @(#) $Id: pager.h,v 1.70 2008/03/20 11:04:21 danielk1977 Exp $
- */
- #ifndef _PAGER_H_
- #define _PAGER_H_
- /*
- ** The type used to represent a page number. The first page in a file
- ** is called page 1. 0 is used to represent "not a page".
- */
- typedef unsigned int Pgno;
- /*
- ** Each open file is managed by a separate instance of the "Pager" structure.
- */
- typedef struct Pager Pager;
- /*
- ** Handle type for pages.
- */
- typedef struct PgHdr DbPage;
- /*
- ** Allowed values for the flags parameter to sqlite3PagerOpen().
- **
- ** NOTE: This values must match the corresponding BTREE_ values in btree.h.
- */
- #define PAGER_OMIT_JOURNAL 0x0001 /* Do not use a rollback journal */
- #define PAGER_NO_READLOCK 0x0002 /* Omit readlocks on readonly files */
- /*
- ** Valid values for the second argument to sqlite3PagerLockingMode().
- */
- #define PAGER_LOCKINGMODE_QUERY -1
- #define PAGER_LOCKINGMODE_NORMAL 0
- #define PAGER_LOCKINGMODE_EXCLUSIVE 1
- /*
- ** See source code comments for a detailed description of the following
- ** routines:
- */
- int sqlite3PagerOpen(sqlite3_vfs *, Pager **ppPager, const char*, int,int,int);
- void sqlite3PagerSetBusyhandler(Pager*, BusyHandler *pBusyHandler);
- void sqlite3PagerSetDestructor(Pager*, void(*)(DbPage*,int));
- void sqlite3PagerSetReiniter(Pager*, void(*)(DbPage*,int));
- int sqlite3PagerSetPagesize(Pager*, u16*);
- int sqlite3PagerMaxPageCount(Pager*, int);
- int sqlite3PagerReadFileheader(Pager*, int, unsigned char*);
- void sqlite3PagerSetCachesize(Pager*, int);
- int sqlite3PagerClose(Pager *pPager);
- int sqlite3PagerAcquire(Pager *pPager, Pgno pgno, DbPage **ppPage, int clrFlag);
- #define sqlite3PagerGet(A,B,C) sqlite3PagerAcquire(A,B,C,0)
- DbPage *sqlite3PagerLookup(Pager *pPager, Pgno pgno);
- int sqlite3PagerRef(DbPage*);
- int sqlite3PagerUnref(DbPage*);
- int sqlite3PagerWrite(DbPage*);
- int sqlite3PagerOverwrite(Pager *pPager, Pgno pgno, void*);
- int sqlite3PagerPagecount(Pager*);
- int sqlite3PagerTruncate(Pager*,Pgno);
- int sqlite3PagerBegin(DbPage*, int exFlag);
- int sqlite3PagerCommitPhaseOne(Pager*,const char *zMaster, Pgno, int);
- int sqlite3PagerCommitPhaseTwo(Pager*);
- int sqlite3PagerRollback(Pager*);
- int sqlite3PagerIsreadonly(Pager*);
- int sqlite3PagerStmtBegin(Pager*);
- int sqlite3PagerStmtCommit(Pager*);
- int sqlite3PagerStmtRollback(Pager*);
- void sqlite3PagerDontRollback(DbPage*);
- void sqlite3PagerDontWrite(DbPage*);
- int sqlite3PagerRefcount(Pager*);
- void sqlite3PagerSetSafetyLevel(Pager*,int,int);
- const char *sqlite3PagerFilename(Pager*);
- const sqlite3_vfs *sqlite3PagerVfs(Pager*);
- sqlite3_file *sqlite3PagerFile(Pager*);
- const char *sqlite3PagerDirname(Pager*);
- const char *sqlite3PagerJournalname(Pager*);
- int sqlite3PagerNosync(Pager*);
- int sqlite3PagerMovepage(Pager*,DbPage*,Pgno);
- void *sqlite3PagerGetData(DbPage *);
- void *sqlite3PagerGetExtra(DbPage *);
- int sqlite3PagerLockingMode(Pager *, int);
- void *sqlite3PagerTempSpace(Pager*);
- int sqlite3PagerSync(Pager *pPager);
- #if defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) && !defined(SQLITE_OMIT_DISKIO)
- int sqlite3PagerReleaseMemory(int);
- #endif
- #ifdef SQLITE_HAS_CODEC
- void sqlite3PagerSetCodec(Pager*,void*(*)(void*,void*,Pgno,int),void*);
- #endif
- #if !defined(NDEBUG) || defined(SQLITE_TEST)
- Pgno sqlite3PagerPagenumber(DbPage*);
- int sqlite3PagerIswriteable(DbPage*);
- #endif
- #ifdef SQLITE_TEST
- int *sqlite3PagerStats(Pager*);
- void sqlite3PagerRefdump(Pager*);
- #endif
- #ifdef SQLITE_TEST
- void disable_simulated_io_errors(void);
- void enable_simulated_io_errors(void);
- #else
- # define disable_simulated_io_errors()
- # define enable_simulated_io_errors()
- #endif
- #endif /* _PAGER_H_ */