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Overview
| Comment: | Add extra OPTIMIZATION-IF-FALSE comments where required to pcache.c. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 9d55b8f541de43deb82d460d32005fd6 |
| User & Date: | dan 2016-05-12 17:06:04 |
Context
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2016-05-12
| ||
| 18:38 | Add an assert in pager.c to confirm that pPager->tempFile is always true for in-memory databases. check-in: 3fd71092 user: drh tags: trunk | |
| 17:06 | Add extra OPTIMIZATION-IF-FALSE comments where required to pcache.c. check-in: 9d55b8f5 user: dan tags: trunk | |
| 12:08 | For in-memory databases, it does not matter if pcache entries are marked "clean" or "writable". check-in: 06c1e27c user: drh tags: trunk | |
Changes
Changes to src/pcache.c.
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*/
void SQLITE_NOINLINE sqlite3PcacheRelease(PgHdr *p){
assert( p->nRef>0 );
p->pCache->nRefSum--;
if( (--p->nRef)==0 ){
if( p->flags&PGHDR_CLEAN ){
pcacheUnpin(p);
}else if( p->pDirtyPrev!=0 ){
/* Move the page to the head of the dirty list. */
pcacheManageDirtyList(p, PCACHE_DIRTYLIST_FRONT);
}
}
}
/*
** Increase the reference count of a supplied page by 1.
................................................................................
/*
** Make sure the page is marked as dirty. If it isn't dirty already,
** make it so.
*/
void sqlite3PcacheMakeDirty(PgHdr *p){
assert( p->nRef>0 );
if( p->flags & (PGHDR_CLEAN|PGHDR_DONT_WRITE) ){
p->flags &= ~PGHDR_DONT_WRITE;
if( p->flags & PGHDR_CLEAN ){
p->flags ^= (PGHDR_DIRTY|PGHDR_CLEAN);
pcacheTrace(("%p.DIRTY %d\n",p->pCache,p->pgno));
assert( (p->flags & (PGHDR_DIRTY|PGHDR_CLEAN))==PGHDR_DIRTY );
pcacheManageDirtyList(p, PCACHE_DIRTYLIST_ADD);
}
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*/
void SQLITE_NOINLINE sqlite3PcacheRelease(PgHdr *p){
assert( p->nRef>0 );
p->pCache->nRefSum--;
if( (--p->nRef)==0 ){
if( p->flags&PGHDR_CLEAN ){
pcacheUnpin(p);
}else if( p->pDirtyPrev!=0 ){ /*OPTIMIZATION-IF-FALSE*/
/* Move the page to the head of the dirty list. If p->pDirtyPrev==0,
** then page p is already at the head of the dirty list and the
** following call would be a no-op. Hence the OPTIMIZATION-IF-FALSE
** tag above. */
pcacheManageDirtyList(p, PCACHE_DIRTYLIST_FRONT);
}
}
}
/*
** Increase the reference count of a supplied page by 1.
................................................................................
/*
** Make sure the page is marked as dirty. If it isn't dirty already,
** make it so.
*/
void sqlite3PcacheMakeDirty(PgHdr *p){
assert( p->nRef>0 );
if( p->flags & (PGHDR_CLEAN|PGHDR_DONT_WRITE) ){ /*OPTIMIZATION-IF-FALSE*/
p->flags &= ~PGHDR_DONT_WRITE;
if( p->flags & PGHDR_CLEAN ){
p->flags ^= (PGHDR_DIRTY|PGHDR_CLEAN);
pcacheTrace(("%p.DIRTY %d\n",p->pCache,p->pgno));
assert( (p->flags & (PGHDR_DIRTY|PGHDR_CLEAN))==PGHDR_DIRTY );
pcacheManageDirtyList(p, PCACHE_DIRTYLIST_ADD);
}
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