Import SQLite 3.7.6.3.

third_party/sqlite/src/src/pager.h

 /*
 ** 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 1.104 2009/07/24 19:01:19 drh Exp $
 */
 
 #ifndef _PAGER_H_
 #define _PAGER_H_
 
 /*
 ** Default maximum size for persistent journal files. A negative 
 ** value means no limit. This value may be overridden using the 
 ** sqlite3PagerJournalSizeLimit() API. See also "PRAGMA journal_size_limit".
 */
@@ skipping 27 matching lines @@
 */
 #define PAGER_MJ_PGNO(x) ((Pgno)((PENDING_BYTE/((x)->pageSize))+1))
 
 /*
 ** Allowed values for the flags parameter to sqlite3PagerOpen().
 **
 ** NOTE: These 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 */
+#define PAGER_MEMORY        0x0004    /* In-memory database */
 
 /*
 ** Valid values for the second argument to sqlite3PagerLockingMode().
 */
 #define PAGER_LOCKINGMODE_QUERY      -1
 #define PAGER_LOCKINGMODE_NORMAL      0
 #define PAGER_LOCKINGMODE_EXCLUSIVE   1
 
 /*
-** Valid values for the second argument to sqlite3PagerJournalMode().
+** Numeric constants that encode the journalmode.  
 */
-#define PAGER_JOURNALMODE_QUERY      -1
+#define PAGER_JOURNALMODE_QUERY     (-1)  /* Query the value of journalmode */
 #define PAGER_JOURNALMODE_DELETE      0   /* Commit by deleting journal file */
 #define PAGER_JOURNALMODE_PERSIST     1   /* Commit by zeroing journal header */
 #define PAGER_JOURNALMODE_OFF         2   /* Journal omitted.  */
 #define PAGER_JOURNALMODE_TRUNCATE    3   /* Commit by truncating journal */
 #define PAGER_JOURNALMODE_MEMORY      4   /* In-memory journal file */
+#define PAGER_JOURNALMODE_WAL         5   /* Use write-ahead logging */
 
 /*
 ** The remainder of this file contains the declarations of the functions
 ** that make up the Pager sub-system API. See source code comments for 
 ** a detailed description of each routine.
 */
 
 /* Open and close a Pager connection. */ 
 int sqlite3PagerOpen(
   sqlite3_vfs*,
   Pager **ppPager,
   const char*,
   int,
   int,
   int,
   void(*)(DbPage*)
 );
 int sqlite3PagerClose(Pager *pPager);
 int sqlite3PagerReadFileheader(Pager*, int, unsigned char*);
 
 /* Functions used to configure a Pager object. */
 void sqlite3PagerSetBusyhandler(Pager*, int(*)(void *), void *);
-int sqlite3PagerSetPagesize(Pager*, u16*, int);
+int sqlite3PagerSetPagesize(Pager*, u32*, int);
 int sqlite3PagerMaxPageCount(Pager*, int);
 void sqlite3PagerSetCachesize(Pager*, int);
-void sqlite3PagerSetSafetyLevel(Pager*,int,int);
+void sqlite3PagerSetSafetyLevel(Pager*,int,int,int);
 int sqlite3PagerLockingMode(Pager *, int);
-int sqlite3PagerJournalMode(Pager *, int);
+int sqlite3PagerSetJournalMode(Pager *, int);
+int sqlite3PagerGetJournalMode(Pager*);
+int sqlite3PagerOkToChangeJournalMode(Pager*);
 i64 sqlite3PagerJournalSizeLimit(Pager *, i64);
 sqlite3_backup **sqlite3PagerBackupPtr(Pager*);
 
 /* Functions used to obtain and release page references. */ 
 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);
 void sqlite3PagerRef(DbPage*);
 void sqlite3PagerUnref(DbPage*);
 
 /* Operations on page references. */
 int sqlite3PagerWrite(DbPage*);
 void sqlite3PagerDontWrite(DbPage*);
 int sqlite3PagerMovepage(Pager*,DbPage*,Pgno,int);
 int sqlite3PagerPageRefcount(DbPage*);
 void *sqlite3PagerGetData(DbPage *); 
 void *sqlite3PagerGetExtra(DbPage *); 
 
 /* Functions used to manage pager transactions and savepoints. */
-int sqlite3PagerPagecount(Pager*, int*);
+void sqlite3PagerPagecount(Pager*, int*);
 int sqlite3PagerBegin(Pager*, int exFlag, int);
 int sqlite3PagerCommitPhaseOne(Pager*,const char *zMaster, int);
+int sqlite3PagerExclusiveLock(Pager*);
 int sqlite3PagerSync(Pager *pPager);
 int sqlite3PagerCommitPhaseTwo(Pager*);
 int sqlite3PagerRollback(Pager*);
 int sqlite3PagerOpenSavepoint(Pager *pPager, int n);
 int sqlite3PagerSavepoint(Pager *pPager, int op, int iSavepoint);
 int sqlite3PagerSharedLock(Pager *pPager);
 
+int sqlite3PagerCheckpoint(Pager *pPager, int, int*, int*);
+int sqlite3PagerWalSupported(Pager *pPager);
+int sqlite3PagerWalCallback(Pager *pPager);
+int sqlite3PagerOpenWal(Pager *pPager, int *pisOpen);
+int sqlite3PagerCloseWal(Pager *pPager);
+
 /* Functions used to query pager state and configuration. */
 u8 sqlite3PagerIsreadonly(Pager*);
 int sqlite3PagerRefcount(Pager*);
+int sqlite3PagerMemUsed(Pager*);
 const char *sqlite3PagerFilename(Pager*);
 const sqlite3_vfs *sqlite3PagerVfs(Pager*);
 sqlite3_file *sqlite3PagerFile(Pager*);
 const char *sqlite3PagerJournalname(Pager*);
 int sqlite3PagerNosync(Pager*);
 /* This function is for preload-cache.patch for Chromium: */
 int sqlite3PagerLoadall(Pager*);
 void *sqlite3PagerTempSpace(Pager*);
 int sqlite3PagerIsMemdb(Pager*);
 
 /* Functions used to truncate the database file. */
 void sqlite3PagerTruncateImage(Pager*,Pgno);
 
+#if defined(SQLITE_HAS_CODEC) && !defined(SQLITE_OMIT_WAL)
+void *sqlite3PagerCodec(DbPage *);
+#endif
+
 /* Functions to support testing and debugging. */
 #if !defined(NDEBUG) || defined(SQLITE_TEST)
   Pgno sqlite3PagerPagenumber(DbPage*);
   int sqlite3PagerIswriteable(DbPage*);
 #endif
 #ifdef SQLITE_TEST
   int *sqlite3PagerStats(Pager*);
   void sqlite3PagerRefdump(Pager*);
   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_ */