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Overview
| Comment: | Minor size and performance optimization to sqlite3BtreeCloseCursor(). |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
16969338841734d00ab906a94b82480c |
| User & Date: | drh 2017-08-14 23:53:02 |
Context
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2017-08-15
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| 03:46 | Btree optimization: New field BtCursor.pPage that points to the current page, saving a single pointer dereference on each access. check-in: 373b71d1 user: drh tags: trunk | |
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2017-08-14
| ||
| 23:53 | Minor size and performance optimization to sqlite3BtreeCloseCursor(). check-in: 16969338 user: drh tags: trunk | |
| 18:13 | Change the internal btree routine moveToRoot() to return SQLITE_EMPTY if the table is empty or if it has pgnoRoot==0. This simplifies the callers, making them smaller and faster. The SQLITE_EMPTY result code is intercepted and changed into SQLITE_OK before surfacing in an API. check-in: 240d5714 user: drh tags: trunk | |
Changes
Changes to src/btree.c.
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*/
int sqlite3BtreeCloseCursor(BtCursor *pCur){
Btree *pBtree = pCur->pBtree;
if( pBtree ){
int i;
BtShared *pBt = pCur->pBt;
sqlite3BtreeEnter(pBtree);
sqlite3BtreeClearCursor(pCur);
assert( pBt->pCursor!=0 );
if( pBt->pCursor==pCur ){
pBt->pCursor = pCur->pNext;
}else{
BtCursor *pPrev = pBt->pCursor;
do{
if( pPrev->pNext==pCur ){
................................................................................
}while( ALWAYS(pPrev) );
}
for(i=0; i<=pCur->iPage; i++){
releasePageNotNull(pCur->apPage[i]);
}
unlockBtreeIfUnused(pBt);
sqlite3_free(pCur->aOverflow);
/* sqlite3_free(pCur); */
sqlite3BtreeLeave(pBtree);
}
return SQLITE_OK;
}
/*
** Make sure the BtCursor* given in the argument has a valid
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*/
int sqlite3BtreeCloseCursor(BtCursor *pCur){
Btree *pBtree = pCur->pBtree;
if( pBtree ){
int i;
BtShared *pBt = pCur->pBt;
sqlite3BtreeEnter(pBtree);
assert( pBt->pCursor!=0 );
if( pBt->pCursor==pCur ){
pBt->pCursor = pCur->pNext;
}else{
BtCursor *pPrev = pBt->pCursor;
do{
if( pPrev->pNext==pCur ){
................................................................................
}while( ALWAYS(pPrev) );
}
for(i=0; i<=pCur->iPage; i++){
releasePageNotNull(pCur->apPage[i]);
}
unlockBtreeIfUnused(pBt);
sqlite3_free(pCur->aOverflow);
sqlite3_free(pCur->pKey);
sqlite3BtreeLeave(pBtree);
}
return SQLITE_OK;
}
/*
** Make sure the BtCursor* given in the argument has a valid
|