/*
** Deallocate a page
*/
static void pcachePageFree(PgHdr *p) {
assert( sqlite3_mutex_held(pcache.mutex) );
if( p->pCache->bPurgeable ) {
pcache.nCurrentPage--;
}
pcacheFree(p->apSave[0]);
pcacheFree(p->apSave[1]);
pcacheFree(p);
}
/*
** Change the page number of page p to newPgno. If newPgno is 0, then the
** page object is added to the clean-list and the PGHDR_REUSE_UNLIKELY
** flag set.
*/
void sqlite3PcacheMove(PgHdr *p, Pgno newPgno) {
assert( p->nRef>0 );
pcacheEnterMutex();
pcacheRemoveFromHash(p);
p->pgno = newPgno;
if( newPgno==0 ) {
p->flags |= PGHDR_REUSE_UNLIKELY;
pcacheFree(p->apSave[0]);
pcacheFree(p->apSave[1]);
p->apSave[0] = 0;
p->apSave[1] = 0;
if( (p->flags & PGHDR_DIRTY) ) {
pcacheMakeClean(p);
}
}
pcacheAddToHash(p);
pcacheExitMutex();
}
/*
** Commit a change previously preserved.
*/
void sqlite3PcacheCommit(PCache *pCache, int idJournal) {
PgHdr *p;
pcacheEnterMutex(); /* Mutex is required to call pcacheFree() */
for(p=pCache->pDirty; p; p=p->pNext) {
if( p->apSave[idJournal] ) {
pcacheFree(p->apSave[idJournal]);
p->apSave[idJournal] = 0;
}
}
pcacheExitMutex();
}
/*
** Rollback a change previously preserved.
*/
void sqlite3PcacheRollback(PCache *pCache, int idJournal) {
PgHdr *p;
int sz;
pcacheEnterMutex(); /* Mutex is required to call pcacheFree() */
sz = pCache->szPage;
for(p=pCache->pDirty; p; p=p->pNext) {
if( p->apSave[idJournal] ) {
memcpy(p->pData, p->apSave[idJournal], sz);
pcacheFree(p->apSave[idJournal]);
p->apSave[idJournal] = 0;
}
}
pcacheExitMutex();
}
void sqlite3PageFree(void *p){
pcacheEnterMutex();
pcacheFree(p);
pcacheExitMutex();
}
