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Demostrate a prototype sqlite3_autovacuum_pages() interface.

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FossilOrigin-Name: bb6f2b8b486c225043bc64e5f74ff6bbad6c5d1f337f0c81eeb6172b087bb943
This commit is contained in:
drh
2021-10-15 23:02:27 +00:00
parent 220f0d6f8e
commit 1bbfc6744c
11 changed files with 350 additions and 29 deletions
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31
src/main.c
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@@ -1403,6 +1403,9 @@ void sqlite3LeaveMutexAndCloseZombie(sqlite3 *db){
** structure?
*/
sqlite3DbFree(db, db->aDb[1].pSchema);
if( db->xAutovacDestr ){
db->xAutovacDestr(db->pAutovacPagesArg);
}
sqlite3_mutex_leave(db->mutex);
db->eOpenState = SQLITE_STATE_CLOSED;
sqlite3_mutex_free(db->mutex);
@@ -2304,6 +2307,34 @@ void *sqlite3_preupdate_hook(
}
#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
/*
** Register a function to be invoked prior to each autovacuum that
** determines the number of pages to vacuum.
*/
int sqlite3_autovacuum_pages(
sqlite3 *db, /* Attach the hook to this database */
unsigned int (*xCallback)(void*,const char*,u32,u32,u32),
void *pArg, /* Argument to the function */
void (*xDestructor)(void*) /* Destructor for pArg */
){
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ){
if( xDestructor ) xDestructor(pArg);
return SQLITE_MISUSE_BKPT;
}
#endif
sqlite3_mutex_enter(db->mutex);
if( db->xAutovacDestr ){
db->xAutovacDestr(db->pAutovacPagesArg);
}
db->xAutovacPages = xCallback;
db->pAutovacPagesArg = pArg;
db->xAutovacDestr = xDestructor;
sqlite3_mutex_leave(db->mutex);
return SQLITE_OK;
}
#ifndef SQLITE_OMIT_WAL
/*
** The sqlite3_wal_hook() callback registered by sqlite3_wal_autocheckpoint().