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Overview
| Comment: | Small performance and size optimization for btreeUnlockIfUnused(). |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
13c746f85d254475b10c3dd58555acd3 |
| User & Date: | drh 2014-09-24 18:31:07 |
Context
|
2014-09-24
| ||
| 19:47 | Have each open database allocate its pTmpSpace when the first write cursor is opened, rather than on each insert or delete, for a small space savings and performance boost. check-in: 99323552 user: drh tags: trunk | |
| 18:31 | Small performance and size optimization for btreeUnlockIfUnused(). check-in: 13c746f8 user: drh tags: trunk | |
| 13:20 | Do not allow parameters in a DEFAULT clause of a CREATE TABLE statement. Ticket [78c0c8c3c9f7c1]. check-in: 1ad2bc1e user: drh tags: trunk | |
Changes
Changes to src/btree.c.
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**
** If there is a transaction in progress, this routine is a no-op.
*/
static void unlockBtreeIfUnused(BtShared *pBt){
assert( sqlite3_mutex_held(pBt->mutex) );
assert( countValidCursors(pBt,0)==0 || pBt->inTransaction>TRANS_NONE );
if( pBt->inTransaction==TRANS_NONE && pBt->pPage1!=0 ){
assert( pBt->pPage1->aData );
assert( sqlite3PagerRefcount(pBt->pPager)==1 );
assert( pBt->pPage1->aData );
releasePage(pBt->pPage1);
pBt->pPage1 = 0;
}
}
/*
** If pBt points to an empty file then convert that empty file
** into a new empty database by initializing the first page of
** the database.
|
> | | | < |
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**
** If there is a transaction in progress, this routine is a no-op.
*/
static void unlockBtreeIfUnused(BtShared *pBt){
assert( sqlite3_mutex_held(pBt->mutex) );
assert( countValidCursors(pBt,0)==0 || pBt->inTransaction>TRANS_NONE );
if( pBt->inTransaction==TRANS_NONE && pBt->pPage1!=0 ){
MemPage *pPage1 = pBt->pPage1;
assert( pPage1->aData );
assert( sqlite3PagerRefcount(pBt->pPager)==1 );
pBt->pPage1 = 0;
releasePage(pPage1);
}
}
/*
** If pBt points to an empty file then convert that empty file
** into a new empty database by initializing the first page of
** the database.
|