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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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47
src/sqlite.h.in
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@@ -444,7 +444,8 @@ int sqlite3_exec(
#define SQLITE_IOERR_LOCK (SQLITE_IOERR | (15<<8))
#define SQLITE_IOERR_CLOSE (SQLITE_IOERR | (16<<8))
#define SQLITE_IOERR_DIR_CLOSE (SQLITE_IOERR | (17<<8))
#define SQLITE_LOCKED_SHAREDCACHE (SQLITE_LOCKED | (1<<8) )
#define SQLITE_LOCKED_SHAREDCACHE (SQLITE_LOCKED | (1<<8))
#define SQLITE_BUSY_RECOVERY (SQLITE_BUSY | (1<<8))
/*
** CAPI3REF: Flags For File Open Operations
@@ -658,7 +659,7 @@ struct sqlite3_io_methods {
int (*xShmSize)(sqlite3_file*, int reqSize, int *pNewSize);
int (*xShmGet)(sqlite3_file*, int reqSize, int *pSize, void volatile**);
int (*xShmRelease)(sqlite3_file*);
int (*xShmLock)(sqlite3_file*, int desiredLock, int *gotLock);
int (*xShmLock)(sqlite3_file*, int offset, int n, int flags);
void (*xShmBarrier)(sqlite3_file*);
int (*xShmClose)(sqlite3_file*, int deleteFlag);
/* Methods above are valid for version 2 */
@@ -888,16 +889,40 @@ struct sqlite3_vfs {
/*
** CAPI3REF: Flags for the xShmLock VFS method
**
** These integer constants define the various locking states that
** an sqlite3_shm object can be in.
** These integer constants define the various locking operations
** allowed by the xShmLock method of [sqlite3_io_methods]. The
** following are the only legal combinations of flags to the
** xShmLock method:
**
** <ul>
** <li> SQLITE_SHM_LOCK | SQLITE_SHM_SHARED
** <li> SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE
** <li> SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED
** <li> SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE
** </ul>
**
** When unlocking, the same SHARED or EXCLUSIVE flag must be supplied as
** was given no the corresponding lock.
**
** The xShmLock method can transition between unlocked and SHARED or
** between unlocked and EXCLUSIVE. It cannot transition between SHARED
** and EXCLUSIVE.
*/
#define SQLITE_SHM_UNLOCK 0
#define SQLITE_SHM_READ 1
#define SQLITE_SHM_READ_FULL 2
#define SQLITE_SHM_WRITE 3
#define SQLITE_SHM_PENDING 4
#define SQLITE_SHM_CHECKPOINT 5
#define SQLITE_SHM_RECOVER 6
#define SQLITE_SHM_UNLOCK 1
#define SQLITE_SHM_LOCK 2
#define SQLITE_SHM_SHARED 4
#define SQLITE_SHM_EXCLUSIVE 8
/*
** CAPI3REF: Maximum xShmLock index
**
** The xShmLock method on [sqlite3_io_methods] may use values
** between 0 and this upper bound as its "offset" argument.
** The SQLite core will never attempt to acquire or release a
** lock outside of this range
*/
#define SQLITE_SHM_NLOCK 8
/*
** CAPI3REF: Initialize The SQLite Library