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Overview
Comment: | Fixes for snapshots API on this branch. Also ensure that the snapshots API cannot be used with wal2 mode databases (for now anyhow). |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | wal2 |
Files: | files | file ages | folders |
SHA3-256: |
19c61ab79458936ff4dfca46cf4d1fb1 |
User & Date: | dan 2018-12-05 16:31:02.698 |
Context
2018-12-05
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17:14 | Fix a problem causing "PRAGMA journal_mode" to report the wrong journal mode (wal instead of wal2) under some circumstances. (check-in: 1d8d4f6896 user: dan tags: wal2) | |
16:45 | Fixes for snapshots API on this branch. Also ensure that the snapshots API cannot be used with wal2 mode databases (for now anyhow). (check-in: d8c2d55fa4 user: dan tags: begin-concurrent-wal2) | |
16:31 | Fixes for snapshots API on this branch. Also ensure that the snapshots API cannot be used with wal2 mode databases (for now anyhow). (check-in: 19c61ab794 user: dan tags: wal2) | |
2018-12-03
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18:13 | Increase a timeout in test file walprotocol2.test. To account for unix builds without HAVE_USLEEP. (check-in: 480be916c8 user: dan tags: wal2) | |
Changes
Changes to src/wal.c.
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3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 | ** SQLITE_OK is returned if successful, or an SQLite error code if an ** error occurs. It is not an error if nBackfillAttempted cannot be ** decreased at all. */ int sqlite3WalSnapshotRecover(Wal *pWal){ int rc; assert( pWal->readLock>=0 ); rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1); if( rc==SQLITE_OK ){ volatile WalCkptInfo *pInfo = walCkptInfo(pWal); int szPage = (int)pWal->szPage; i64 szDb; /* Size of db file in bytes */ | > > > | 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 | ** SQLITE_OK is returned if successful, or an SQLite error code if an ** error occurs. It is not an error if nBackfillAttempted cannot be ** decreased at all. */ int sqlite3WalSnapshotRecover(Wal *pWal){ int rc; /* Snapshots may not be used with wal2 mode databases. */ if( isWalMode2(pWal) ) return SQLITE_ERROR; assert( pWal->readLock>=0 ); rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1); if( rc==SQLITE_OK ){ volatile WalCkptInfo *pInfo = walCkptInfo(pWal); int szPage = (int)pWal->szPage; i64 szDb; /* Size of db file in bytes */ |
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3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 | int sqlite3WalBeginReadTransaction(Wal *pWal, int *pChanged){ int rc; /* Return code */ int cnt = 0; /* Number of TryBeginRead attempts */ #ifdef SQLITE_ENABLE_SNAPSHOT int bChanged = 0; WalIndexHdr *pSnapshot = pWal->pSnapshot; if( pSnapshot && memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){ bChanged = 1; } #endif do{ rc = walTryBeginRead(pWal, pChanged, 0, ++cnt); | > | 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 | int sqlite3WalBeginReadTransaction(Wal *pWal, int *pChanged){ int rc; /* Return code */ int cnt = 0; /* Number of TryBeginRead attempts */ #ifdef SQLITE_ENABLE_SNAPSHOT int bChanged = 0; WalIndexHdr *pSnapshot = pWal->pSnapshot; if( pSnapshot && isWalMode2(pWal) ) return SQLITE_ERROR; if( pSnapshot && memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){ bChanged = 1; } #endif do{ rc = walTryBeginRead(pWal, pChanged, 0, ++cnt); |
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4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 | ** every other subsystem, so the WAL module can put whatever it needs ** in the object. */ int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot){ int rc = SQLITE_OK; WalIndexHdr *pRet; static const u32 aZero[4] = { 0, 0, 0, 0 }; assert( pWal->readLock>=0 && pWal->writeLock==0 ); | > > > | | 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 | ** every other subsystem, so the WAL module can put whatever it needs ** in the object. */ int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot){ int rc = SQLITE_OK; WalIndexHdr *pRet; static const u32 aZero[4] = { 0, 0, 0, 0 }; /* Snapshots may not be used with wal2 mode databases. */ if( isWalMode2(pWal) ) return SQLITE_ERROR; assert( pWal->readLock>=0 && pWal->writeLock==0 ); if( memcmp(&pWal->hdr.aFrameCksum[0],aZero,8)==0 ){ *ppSnapshot = 0; return SQLITE_ERROR; } pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr)); if( pRet==0 ){ rc = SQLITE_NOMEM_BKPT; }else{ |
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4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 | ** If the snapshot is not available, SQLITE_ERROR is returned. Or, if ** the CHECKPOINTER lock cannot be obtained, SQLITE_BUSY. If any error ** occurs (any value other than SQLITE_OK is returned), the CHECKPOINTER ** lock is released before returning. */ int sqlite3WalSnapshotCheck(Wal *pWal, sqlite3_snapshot *pSnapshot){ int rc; rc = walLockShared(pWal, WAL_CKPT_LOCK); if( rc==SQLITE_OK ){ WalIndexHdr *pNew = (WalIndexHdr*)pSnapshot; if( memcmp(pNew->aSalt, pWal->hdr.aSalt, sizeof(pWal->hdr.aSalt)) || pNew->mxFrame<walCkptInfo(pWal)->nBackfillAttempted ){ rc = SQLITE_ERROR_SNAPSHOT; | > > > > | 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 | ** If the snapshot is not available, SQLITE_ERROR is returned. Or, if ** the CHECKPOINTER lock cannot be obtained, SQLITE_BUSY. If any error ** occurs (any value other than SQLITE_OK is returned), the CHECKPOINTER ** lock is released before returning. */ int sqlite3WalSnapshotCheck(Wal *pWal, sqlite3_snapshot *pSnapshot){ int rc; /* Snapshots may not be used with wal2 mode databases. */ if( isWalMode2(pWal) ) return SQLITE_ERROR; rc = walLockShared(pWal, WAL_CKPT_LOCK); if( rc==SQLITE_OK ){ WalIndexHdr *pNew = (WalIndexHdr*)pSnapshot; if( memcmp(pNew->aSalt, pWal->hdr.aSalt, sizeof(pWal->hdr.aSalt)) || pNew->mxFrame<walCkptInfo(pWal)->nBackfillAttempted ){ rc = SQLITE_ERROR_SNAPSHOT; |
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