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Overview
| Comment: | Fix spacing typo in comment. No changes to code. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | snapshot-get |
| Files: | files | file ages | folders |
| SHA1: |
3a18526fc2253658dad84c5e600481c8 |
| User & Date: | mistachkin 2015-12-10 03:16:47 |
Context
|
2015-12-10
| ||
| 15:45 | Have sqlite3_snapshot_open() avoid a race condition by taking a shared CHECKPOINTER lock while checking pInfo->nBackfillAttempted. check-in: 8084eae0 user: dan tags: snapshot-get | |
| 03:16 | Fix spacing typo in comment. No changes to code. check-in: 3a18526f user: mistachkin tags: snapshot-get | |
| 02:15 | Add the nBackfillAttempted field in formerly unused space in WalCkptInfo and use that field to close the race condition on opening a snapshot. check-in: cb68e9d0 user: drh tags: snapshot-get | |
Changes
Changes to src/wal.c.
328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 |
** holding the WAL_CKPT_LOCK lock (which includes a recovery thread).
** However, a WAL_WRITE_LOCK thread can move the value of nBackfill from
** mxFrame back to zero when the WAL is reset.
**
** nBackfillAttempted is the largest value of nBackfill that a checkpoint
** has attempted to achieve. Normally nBackfill==nBackfillAtempted, however
** the nBackfillAttempted is set before any backfilling is done and the
** nBackfill is only set afte rall backfilling completes. So if a checkpoint
** crashes, nBackfillAttempted might be larger than nBackfill. The
** WalIndexHdr.mxFrame must never be less than nBackfillAttempted.
**
** The aLock[] field is a set of bytes used for locking. These bytes should
** never be read or written.
**
** There is one entry in aReadMark[] for each reader lock. If a reader
|
| |
328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 |
** holding the WAL_CKPT_LOCK lock (which includes a recovery thread).
** However, a WAL_WRITE_LOCK thread can move the value of nBackfill from
** mxFrame back to zero when the WAL is reset.
**
** nBackfillAttempted is the largest value of nBackfill that a checkpoint
** has attempted to achieve. Normally nBackfill==nBackfillAtempted, however
** the nBackfillAttempted is set before any backfilling is done and the
** nBackfill is only set after all backfilling completes. So if a checkpoint
** crashes, nBackfillAttempted might be larger than nBackfill. The
** WalIndexHdr.mxFrame must never be less than nBackfillAttempted.
**
** The aLock[] field is a set of bytes used for locking. These bytes should
** never be read or written.
**
** There is one entry in aReadMark[] for each reader lock. If a reader
|