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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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37
src/test_vfs.c
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@@ -102,7 +102,7 @@ static int tvfsShmOpen(sqlite3_file*);
static int tvfsShmSize(sqlite3_file*, int , int *);
static int tvfsShmGet(sqlite3_file*, int , int *, volatile void **);
static int tvfsShmRelease(sqlite3_file*);
static int tvfsShmLock(sqlite3_file*, int , int *);
static int tvfsShmLock(sqlite3_file*, int , int, int);
static void tvfsShmBarrier(sqlite3_file*);
static int tvfsShmClose(sqlite3_file*, int);
@@ -544,31 +544,34 @@ static int tvfsShmRelease(sqlite3_file *pFile){
static int tvfsShmLock(
sqlite3_file *pFile,
int desiredLock,
int *gotLock
int ofst,
int n,
int flags
){
int rc = SQLITE_OK;
TestvfsFile *pFd = (TestvfsFile *)pFile;
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
char *zLock = "";
int nLock;
char zLock[80];
switch( desiredLock ){
case SQLITE_SHM_READ: zLock = "READ"; break;
case SQLITE_SHM_WRITE: zLock = "WRITE"; break;
case SQLITE_SHM_CHECKPOINT: zLock = "CHECKPOINT"; break;
case SQLITE_SHM_RECOVER: zLock = "RECOVER"; break;
case SQLITE_SHM_PENDING: zLock = "PENDING"; break;
case SQLITE_SHM_UNLOCK: zLock = "UNLOCK"; break;
sqlite3_snprintf(sizeof(zLock), zLock, "%d %d", ofst, n);
nLock = strlen(zLock);
if( flags & SQLITE_SHM_LOCK ){
strcpy(&zLock[nLock], " lock");
}else{
strcpy(&zLock[nLock], " unlock");
}
nLock += strlen(&zLock[nLock]);
if( flags & SQLITE_SHM_SHARED ){
strcpy(&zLock[nLock], " shared");
}else{
strcpy(&zLock[nLock], " exclusive");
}
tvfsExecTcl(p, "xShmLock",
Tcl_NewStringObj(pFd->pShm->zFile, -1), pFd->pShmId,
Tcl_NewStringObj(zLock, -1)
);
tvfsResultCode(p, &rc);
if( rc==SQLITE_OK ){
*gotLock = desiredLock;
}
return rc;
}
@@ -716,9 +719,7 @@ static void testvfs_obj_del(ClientData cd){
**
** SCRIPT xShmLock FILENAME ID LOCK
**
** where LOCK is one of "UNLOCK", "READ", "READ_FULL", "WRITE", "PENDING",
** "CHECKPOINT" or "RECOVER". The script should return an SQLite error
** code.
** where LOCK is of the form "OFFSET NBYTE lock/unlock shared/exclusive"
*/
static int testvfs_cmd(
ClientData cd,