Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
| Comment: | Comment typo fix and minor cleanup in the pager. No logic changes. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
94ef17012855b7be725594c34bcea75f |
| User & Date: | drh 2015-06-28 17:33:11.230 |
Context
|
2015-06-29
| ||
| 00:21 | Use tail recursion in pcache1Unpin() to get a small size reduction and speed improvement. (check-in: fde70472ae user: drh tags: trunk) | |
|
2015-06-28
| ||
| 17:33 | Comment typo fix and minor cleanup in the pager. No logic changes. (check-in: 94ef170128 user: drh tags: trunk) | |
| 02:58 | Avoid unnecessary calls to sqlite3VdbeSerialTypeLen() for integer serial types, for a small size reduction and a speed increase. (check-in: 9cd30d33b1 user: drh tags: trunk) | |
Changes
Changes to src/pager.c.
| ︙ | ︙ | |||
5127 5128 5129 5130 5131 5132 5133 |
if( !pPager->tempFile && pPager->hasBeenUsed ){
/* The shared-lock has just been acquired then check to
** see if the database has been modified. If the database has changed,
** flush the cache. The pPager->hasBeenUsed flag prevents this from
** occurring on the very first access to a file, in order to save a
** single unnecessary sqlite3OsRead() call at the start-up.
**
| | | 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 |
if( !pPager->tempFile && pPager->hasBeenUsed ){
/* The shared-lock has just been acquired then check to
** see if the database has been modified. If the database has changed,
** flush the cache. The pPager->hasBeenUsed flag prevents this from
** occurring on the very first access to a file, in order to save a
** single unnecessary sqlite3OsRead() call at the start-up.
**
** Database changes are detected by looking at 15 bytes beginning
** at offset 24 into the file. The first 4 of these 16 bytes are
** a 32-bit counter that is incremented with each change. The
** other bytes change randomly with each file change when
** a codec is in use.
**
** There is a vanishingly small chance that a change will not be
** detected. The chance of an undetected change is so small that
|
| ︙ | ︙ | |||
5348 5349 5350 5351 5352 5353 5354 |
if( rc!=SQLITE_OK ){
/* Either the call to sqlite3PcacheFetch() returned an error or the
** pager was already in the error-state when this function was called.
** Set pPg to 0 and jump to the exception handler. */
pPg = 0;
goto pager_acquire_err;
}
| > | | | < | 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 |
if( rc!=SQLITE_OK ){
/* Either the call to sqlite3PcacheFetch() returned an error or the
** pager was already in the error-state when this function was called.
** Set pPg to 0 and jump to the exception handler. */
pPg = 0;
goto pager_acquire_err;
}
assert( pPg==(*ppPage) );
assert( pPg->pgno==pgno );
assert( pPg->pPager==pPager || pPg->pPager==0 );
if( pPg->pPager && !noContent ){
/* In this case the pcache already contains an initialized copy of
** the page. Return without further ado. */
assert( pgno<=PAGER_MAX_PGNO && pgno!=PAGER_MJ_PGNO(pPager) );
pPager->aStat[PAGER_STAT_HIT]++;
return SQLITE_OK;
}else{
/* The pager cache has created a new page. Its content needs to
** be initialized. */
pPg->pPager = pPager;
/* The maximum page number is 2^31. Return SQLITE_CORRUPT if a page
** number greater than this, or the unused locking-page, is requested. */
if( pgno>PAGER_MAX_PGNO || pgno==PAGER_MJ_PGNO(pPager) ){
rc = SQLITE_CORRUPT_BKPT;
goto pager_acquire_err;
|
| ︙ | ︙ |