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Initial code for incremental checkpoint in WAL mode. This check-in compiles

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on unix and runs as long as you do not engage WAL mode.  WAL mode crashes and
burns.  Consider this check-in a baseline implementation for getting the new
capability up and running.

FossilOrigin-Name: ef3ba7a17ff90674d702e5694b9e792851ab6998
This commit is contained in:
drh
2010-05-30 19:55:15 +00:00
parent a7a0c615d7
commit 73b64e4d2e
13 changed files with 811 additions and 617 deletions
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34
src/wal.h
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@@ -20,19 +20,20 @@
#include "sqliteInt.h"
#ifdef SQLITE_OMIT_WAL
# define sqlite3WalOpen(x,y,z) 0
# define sqlite3WalClose(w,x,y,z) 0
# define sqlite3WalOpenSnapshot(y,z) 0
# define sqlite3WalCloseSnapshot(z)
# define sqlite3WalRead(v,w,x,y,z) 0
# define sqlite3WalOpen(x,y,z) 0
# define sqlite3WalClose(w,x,y,z) 0
# define sqlite3WalBeginReadTransaction(y,z) 0
# define sqlite3WalEndReadTransaction(z)
# define sqlite3WalRead(v,w,x,y,z) 0
# define sqlite3WalDbsize(y,z)
# define sqlite3WalWriteLock(y,z) 0
# define sqlite3WalUndo(x,y,z) 0
# define sqlite3WalBeginWriteTransaction(y) 0
# define sqlite3WalEndWRiteTransaction(x) 0
# define sqlite3WalUndo(x,y,z) 0
# define sqlite3WalSavepoint(y,z)
# define sqlite3WalSavepointUndo(y,z) 0
# define sqlite3WalFrames(u,v,w,x,y,z) 0
# define sqlite3WalCheckpoint(u,v,w,x,y,z) 0
# define sqlite3WalCallback(z) 0
# define sqlite3WalSavepointUndo(y,z) 0
# define sqlite3WalFrames(u,v,w,x,y,z) 0
# define sqlite3WalCheckpoint(u,v,w,x) 0
# define sqlite3WalCallback(z) 0
#else
#define WAL_SAVEPOINT_NDATA 3
@@ -53,8 +54,8 @@ int sqlite3WalClose(Wal *pWal, int sync_flags, int, u8 *);
** write to or checkpoint the WAL. sqlite3WalCloseSnapshot() closes the
** transaction and releases the lock.
*/
int sqlite3WalOpenSnapshot(Wal *pWal, int *);
void sqlite3WalCloseSnapshot(Wal *pWal);
int sqlite3WalBeginReadTransaction(Wal *pWal, int *);
void sqlite3WalEndReadTransaction(Wal *pWal);
/* Read a page from the write-ahead log, if it is present. */
int sqlite3WalRead(Wal *pWal, Pgno pgno, int *pInWal, int nOut, u8 *pOut);
@@ -64,7 +65,8 @@ int sqlite3WalRead(Wal *pWal, Pgno pgno, int *pInWal, int nOut, u8 *pOut);
void sqlite3WalDbsize(Wal *pWal, Pgno *pPgno);
/* Obtain or release the WRITER lock. */
int sqlite3WalWriteLock(Wal *pWal, int op);
int sqlite3WalBeginWriteTransaction(Wal *pWal);
int sqlite3WalEndWriteTransaction(Wal *pWal);
/* Undo any frames written (but not committed) to the log */
int sqlite3WalUndo(Wal *pWal, int (*xUndo)(void *, Pgno), void *pUndoCtx);
@@ -85,9 +87,7 @@ int sqlite3WalCheckpoint(
Wal *pWal, /* Write-ahead log connection */
int sync_flags, /* Flags to sync db file with (or 0) */
int nBuf, /* Size of buffer nBuf */
u8 *zBuf, /* Temporary buffer to use */
int (*xBusyHandler)(void *), /* Pointer to busy-handler function */
void *pBusyHandlerArg /* Argument to pass to xBusyHandler */
u8 *zBuf /* Temporary buffer to use */
);
/* Return the value to pass to a sqlite3_wal_hook callback, the