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Overview
| Comment: | Performance improvements in the getAndInitPage() routine of btree.c. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
2aa50f6f2029e3c91a4cb91224df8ec1 |
| User & Date: | drh 2015-11-04 22:31:02 |
Context
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2015-11-05
| ||
| 11:47 | Remove a #pragma used to work around an issues with MSVC 2012 that has been overcome but subsequent changes. (check-in: 8303e4cf user: drh tags: trunk) | |
| 03:26 | Remove #pragma that was used to work around an obsolete issue with MSVC 2012. (Closed-Leaf check-in: b9b22fae user: mistachkin tags: reoptimizeArm) | |
|
2015-11-04
| ||
| 22:31 | Performance improvements in the getAndInitPage() routine of btree.c. (check-in: 2aa50f6f user: drh tags: trunk) | |
| 20:22 | Rename the sqlite3PagerAcquire() function to sqlite3PagerGet(). The former macro called sqlite3PagerGet() has been removed. (check-in: 708253be user: drh tags: trunk) | |
Changes
Changes to src/btree.c.
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/*
** Convert a DbPage obtained from the pager into a MemPage used by
** the btree layer.
*/
static MemPage *btreePageFromDbPage(DbPage *pDbPage, Pgno pgno, BtShared *pBt){
MemPage *pPage = (MemPage*)sqlite3PagerGetExtra(pDbPage);
pPage->aData = sqlite3PagerGetData(pDbPage);
pPage->pDbPage = pDbPage;
pPage->pBt = pBt;
pPage->pgno = pgno;
pPage->hdrOffset = pgno==1 ? 100 : 0;
return pPage;
}
/*
** Get a page from the pager. Initialize the MemPage.pBt and
** MemPage.aData elements if needed. See also: btreeGetUnusedPage().
**
................................................................................
rc = SQLITE_CORRUPT_BKPT;
goto getAndInitPage_error;
}
rc = sqlite3PagerGet(pBt->pPager, pgno, (DbPage**)&pDbPage, bReadOnly);
if( rc ){
goto getAndInitPage_error;
}
*ppPage = btreePageFromDbPage(pDbPage, pgno, pBt);
if( (*ppPage)->isInit==0 ){
rc = btreeInitPage(*ppPage);
if( rc!=SQLITE_OK ){
releasePage(*ppPage);
goto getAndInitPage_error;
}
}
/* If obtaining a child page for a cursor, we must verify that the page is
** compatible with the root page. */
if( pCur
&& ((*ppPage)->nCell<1 || (*ppPage)->intKey!=pCur->curIntKey)
){
rc = SQLITE_CORRUPT_BKPT;
releasePage(*ppPage);
goto getAndInitPage_error;
}
return SQLITE_OK;
getAndInitPage_error:
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/*
** Convert a DbPage obtained from the pager into a MemPage used by
** the btree layer.
*/
static MemPage *btreePageFromDbPage(DbPage *pDbPage, Pgno pgno, BtShared *pBt){
MemPage *pPage = (MemPage*)sqlite3PagerGetExtra(pDbPage);
if( pgno!=pPage->pgno ){
pPage->aData = sqlite3PagerGetData(pDbPage);
pPage->pDbPage = pDbPage;
pPage->pBt = pBt;
pPage->pgno = pgno;
pPage->hdrOffset = pgno==1 ? 100 : 0;
}
assert( pPage->aData==sqlite3PagerGetData(pDbPage) );
return pPage;
}
/*
** Get a page from the pager. Initialize the MemPage.pBt and
** MemPage.aData elements if needed. See also: btreeGetUnusedPage().
**
................................................................................
rc = SQLITE_CORRUPT_BKPT;
goto getAndInitPage_error;
}
rc = sqlite3PagerGet(pBt->pPager, pgno, (DbPage**)&pDbPage, bReadOnly);
if( rc ){
goto getAndInitPage_error;
}
*ppPage = (MemPage*)sqlite3PagerGetExtra(pDbPage);
if( (*ppPage)->isInit==0 ){
btreePageFromDbPage(pDbPage, pgno, pBt);
rc = btreeInitPage(*ppPage);
if( rc!=SQLITE_OK ){
releasePage(*ppPage);
goto getAndInitPage_error;
}
}
assert( (*ppPage)->pgno==pgno );
assert( (*ppPage)->aData==sqlite3PagerGetData(pDbPage) );
/* If obtaining a child page for a cursor, we must verify that the page is
** compatible with the root page. */
if( pCur && ((*ppPage)->nCell<1 || (*ppPage)->intKey!=pCur->curIntKey) ){
rc = SQLITE_CORRUPT_BKPT;
releasePage(*ppPage);
goto getAndInitPage_error;
}
return SQLITE_OK;
getAndInitPage_error:
|