- C Fix\sa\sproblem\swith\shandling\ssavepoints\sin\sBEGIN\sCONCURRENT\stransactions.
- D 2023-08-11T18:31:17.859
-C Merge\slatest\strunk\schanges,\sincluding\ssupport\sfor\shandling\sof\sstructured-exceptions\sin\sMSVC\sbuilds,\swith\sthis\sbranch.
-D 2023-08-11T19:33:54.234
++C Merge\slatest\swal2\schanges,\sincluding\ssupport\sfor\shandling\sof\sstructured-exceptions\sin\sMSVC\sbuilds,\swith\sthis\sbranch.
++D 2023-08-11T19:36:24.769
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F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
-F Makefile.in e1282d59cf2dffef4a69ca4b0364129fdaefd2f1718bf789f6b5d27992261bad
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F README.md c1c4218efcc4071a6e26db2b517fdbc1035696a29b370edd655faddbef02b224
F VERSION c6366dc72582d3144ce87b013cc35fe48d62f6d07d5be0c9716ea33c862144aa
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F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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U dan
- Z 76630078e009601b5939323665b2f41d
-Z cdba8e6176109f758d02fe30f64aa30c
++Z 8a22f21379a7b432c426975e82b8bfd5
# Remove this line to create a well-formed Fossil manifest.
const char *zWalName; /* Name of WAL file */
const char *zWalName2; /* Name of second WAL file */
u32 nCkpt; /* Checkpoint sequence counter in the wal-header */
+ FastPrng sPrng; /* Random number generator */
+ #ifdef SQLITE_USE_SEH
+ u32 lockMask; /* Mask of locks held */
+ void *pFree; /* Pointer to sqlite3_free() if exception thrown */
+ int iSysErrno; /* System error code following exception */
+ #endif
#ifdef SQLITE_DEBUG
+ int nSehTry; /* Number of nested SEH_TRY{} blocks */
u8 lockError; /* True if a locking error has occurred */
#endif
#ifdef SQLITE_ENABLE_SNAPSHOT
}
#endif /* SQLITE_ENABLE_SNAPSHOT */
+/*
+** Return the current last frame in the wal-index - mxFrame for *-wal,
+** or mxFrame2 for *-wal2. If the last frame is current in wal2, return
+** mxFrame2 without clearing the 0x80000000 bit.
+*/
+static u32 walGetPriorFrame(WalIndexHdr *pHdr){
+ return (walidxGetFile(pHdr) ? pHdr->mxFrame2 : pHdr->mxFrame);
+}
+
/*
- ** Begin a read transaction on the database.
- **
- ** This routine used to be called sqlite3OpenSnapshot() and with good reason:
- ** it takes a snapshot of the state of the WAL and wal-index for the current
- ** instant in time. The current thread will continue to use this snapshot.
- ** Other threads might append new content to the WAL and wal-index but
- ** that extra content is ignored by the current thread.
- **
- ** If the database contents have changes since the previous read
- ** transaction, then *pChanged is set to 1 before returning. The
- ** Pager layer will use this to know that its cache is stale and
- ** needs to be flushed.
+ ** This function does the work of sqlite3WalBeginReadTransaction() (see
+ ** below). That function simply calls this one inside an SEH_TRY{...} block.
*/
- int sqlite3WalBeginReadTransaction(Wal *pWal, int *pChanged){
+ static int walBeginReadTransaction(Wal *pWal, int *pChanged){
int rc; /* Return code */
int cnt = 0; /* Number of TryBeginRead attempts */
#ifdef SQLITE_ENABLE_SNAPSHOT
return SQLITE_OK;
}
#endif
- if( memcmp(&pWal->hdr, (void *)walIndexHdr(pWal), sizeof(WalIndexHdr))!=0 ){
+
+ rc = walWriteLock(pWal);
+ if( rc==SQLITE_OK ){
+ /* If another connection has written to the database file since the
+ ** time the read transaction on this connection was started, then
+ ** the write is disallowed. Release the WRITER lock and return
+ ** SQLITE_BUSY_SNAPSHOT in this case. */
- rc = SQLITE_BUSY_SNAPSHOT;
++ SEH_TRY {
++ if( memcmp(&pWal->hdr, (void*)walIndexHdr(pWal),sizeof(WalIndexHdr))!=0 ){
++ rc = SQLITE_BUSY_SNAPSHOT;
++ }
++ }
++ SEH_EXCEPT( rc = SQLITE_IOERR_IN_PAGE; )
++ if( rc!=SQLITE_OK ){
+ walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
+ pWal->writeLock = 0;
+ }
+ }
+ return rc;
+}
+
+/*
+** This function is called by a writer that has a read-lock on aReadmark[0]
+** (pWal->readLock==0). This function relinquishes that lock and takes a
+** lock on a different aReadmark[] slot.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
+*/
+static int walUpgradeReadlock(Wal *pWal){
+ int cnt;
+ int rc;
+ assert( pWal->writeLock && pWal->readLock==0 );
+ assert( isWalMode2(pWal)==0 );
+ walUnlockShared(pWal, WAL_READ_LOCK(0));
+ pWal->readLock = -1;
+ cnt = 0;
+ do{
+ int notUsed;
+ rc = walTryBeginRead(pWal, ¬Used, 1, ++cnt);
+ }while( rc==WAL_RETRY );
+ assert( (rc&0xff)!=SQLITE_BUSY ); /* BUSY not possible when useWal==1 */
+ testcase( (rc&0xff)==SQLITE_IOERR );
+ testcase( rc==SQLITE_PROTOCOL );
+ testcase( rc==SQLITE_OK );
+ return rc;
+}
- /* Cannot start a write transaction without first holding a read
- ** transaction. */
- assert( pWal->readLock!=WAL_LOCK_NONE );
- assert( pWal->writeLock==0 && pWal->iReCksum==0 );
- if( pWal->readOnly ){
- return SQLITE_READONLY;
- }
+#ifndef SQLITE_OMIT_CONCURRENT
- /* Only one writer allowed at a time. Get the write lock. Return
- ** SQLITE_BUSY if unable.
- */
- rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1);
- if( rc ){
- return rc;
+/*
+** A concurrent transaction has conflicted with external frame iExternal.
+** Transform this value to the one required by SQLITE_COMMIT_CONFLICT_FRAME -
+** the frame offset within its wal file, with the 0x80000000 bit set for
+** wal2, clear for the default wal file.
+*/
+static u32 walConflictFrame(Wal *pWal, u32 iExternal){
+ u32 iRet = iExternal;
+ if( isWalMode2(pWal) ){
+ int bFile = walExternalDecode(iExternal, &iRet);
+ iRet = (iRet | (bFile ? 0x80000000 : 0));
}
- pWal->writeLock = 1;
+ return iRet;
+}
+
+
+
+/*
+** This function is only ever called when committing a "BEGIN CONCURRENT"
+** transaction. It may be assumed that no frames have been written to
+** the wal file. The second parameter is a pointer to the in-memory
+** representation of page 1 of the database (which may or may not be
+** dirty). The third is a bitvec with a bit set for each page in the
+** database file that was read by the current concurrent transaction.
+**
+** This function performs three tasks:
+**
+** 1) It obtains the WRITER lock on the wal file,
+**
+** 2) It checks that there are no conflicts between the current
+** transaction and any transactions committed to the wal file since
+** it was opened, and
+**
+** 3) It ejects any non-dirty pages from the page-cache that have been
+** written by another client since the CONCURRENT transaction was started
+** (so as to avoid ending up with an inconsistent cache after the
+** current transaction is committed).
+**
+** If no error occurs and the caller may proceed with committing the
+** transaction, SQLITE_OK is returned. SQLITE_BUSY is returned if the WRITER
+** lock cannot be obtained. Or, if the WRITER lock can be obtained but there
+** are conflicts with a committed transaction, SQLITE_BUSY_SNAPSHOT. Finally,
+** if an error (i.e. an OOM condition or IO error), an SQLite error code
+** is returned.
+*/
+int sqlite3WalLockForCommit(
+ Wal *pWal,
+ PgHdr *pPg1,
+ Bitvec *pAllRead,
+ u32 *aConflict
+){
+ int rc = walWriteLock(pWal);
- /* If another connection has written to the database file since the
- ** time the read transaction on this connection was started, then
- ** the write is disallowed.
+ /* If the database has been modified since this transaction was started,
+ ** check if it is still possible to commit. The transaction can be
+ ** committed if:
+ **
+ ** a) None of the pages in pList have been modified since the
+ ** transaction opened, and
+ **
+ ** b) The database schema cookie has not been modified since the
+ ** transaction was started.
*/
- SEH_TRY {
- if( memcmp(&pWal->hdr, (void *)walIndexHdr(pWal), sizeof(WalIndexHdr))!=0 ){
+ if( rc==SQLITE_OK ){
+ WalIndexHdr head;
+
+ if( walIndexLoadHdr(pWal, &head) ){
+ /* This branch is taken if the wal-index header is corrupted. This
+ ** occurs if some other writer has crashed while committing a
+ ** transaction to this database since the current concurrent transaction
+ ** was opened. */
rc = SQLITE_BUSY_SNAPSHOT;
- }
- }
- SEH_EXCEPT( rc = SQLITE_IOERR_IN_PAGE; )
+ }else if( memcmp(&pWal->hdr, (void*)&head, sizeof(WalIndexHdr))!=0 ){
+ int bWal2 = isWalMode2(pWal);
+ int iHash;
+ int nLoop = 1+(bWal2 && walidxGetFile(&head)!=walidxGetFile(&pWal->hdr));
+ int iLoop;
+
+ if( pPg1==0 ){
+ /* If pPg1==0, then the current transaction modified the database
+ ** schema. This means it conflicts with all other transactions. */
+ u32 bFile = walidxGetFile(&pWal->hdr);
+ u32 iFrame = walidxGetMxFrame(&head, bFile) | (bFile << 31);
+ aConflict[SQLITE_COMMIT_CONFLICT_PGNO] = 1;
+ aConflict[SQLITE_COMMIT_CONFLICT_FRAME] = iFrame;
+ rc = SQLITE_BUSY_SNAPSHOT;
+ }
- if( rc!=SQLITE_OK ){
- walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
- pWal->writeLock = 0;
+ assert( nLoop==1 || nLoop==2 );
+ for(iLoop=0; rc==SQLITE_OK && iLoop<nLoop; iLoop++){
+ u32 iFirst; /* First (external) wal frame to check */
+ u32 iLastHash; /* Last hash to check this loop */
+ u32 mxFrame; /* Last (external) wal frame to check */
+
+ if( bWal2==0 ){
+ assert( iLoop==0 );
+ /* Special case for wal mode. If this concurrent transaction was
+ ** opened after the entire wal file had been checkpointed, and
+ ** another connection has since wrapped the wal file, then we wish to
+ ** iterate through every frame in the new wal file - not just those
+ ** that follow the current value of pWal->hdr.mxFrame (which will be
+ ** set to the size of the old, now overwritten, wal file). This
+ ** doesn't come up in wal2 mode, as in wal2 mode the client always
+ ** has a PART lock on one of the wal files, preventing it from being
+ ** checkpointed or overwritten. */
+ iFirst = pWal->hdr.mxFrame+1;
+ if( memcmp(pWal->hdr.aSalt, (u32*)head.aSalt, sizeof(u32)*2) ){
+ assert( pWal->readLock==0 );
+ iFirst = 1;
+ }
+ mxFrame = head.mxFrame;
+ }else{
+ int iA = walidxGetFile(&pWal->hdr);
+ if( iLoop==0 ){
+ iFirst = walExternalEncode(iA, 1+walidxGetMxFrame(&pWal->hdr, iA));
+ mxFrame = walExternalEncode(iA, walidxGetMxFrame(&head, iA));
+ }else{
+ iFirst = walExternalEncode(!iA, 1);
+ mxFrame = walExternalEncode(!iA, walidxGetMxFrame(&head, !iA));
+ }
+ }
+ iLastHash = walFramePage(mxFrame);
+
+ for(iHash=walFramePage(iFirst); iHash<=iLastHash; iHash += (1+bWal2)){
+ WalHashLoc sLoc;
+
+ rc = walHashGet(pWal, iHash, &sLoc);
+ if( rc==SQLITE_OK ){
+ u32 i, iMin, iMax;
+ assert( mxFrame>=sLoc.iZero );
+ iMin = (sLoc.iZero >= iFirst) ? 1 : (iFirst - sLoc.iZero);
+ iMax = (iHash==0) ? HASHTABLE_NPAGE_ONE : HASHTABLE_NPAGE;
+ if( iMax>(mxFrame-sLoc.iZero) ) iMax = (mxFrame-sLoc.iZero);
+ for(i=iMin; rc==SQLITE_OK && i<=iMax; i++){
+ PgHdr *pPg;
+ if( sLoc.aPgno[i-1]==1 ){
+ /* Check that the schema cookie has not been modified. If
+ ** it has not, the commit can proceed. */
+ u8 aNew[4];
+ u8 *aOld = &((u8*)pPg1->pData)[40];
+ int sz;
+ i64 iOff;
+ u32 iFrame = sLoc.iZero + i;
+ int iWal = 0;
+ if( bWal2 ){
+ iWal = walExternalDecode(iFrame, &iFrame);
+ }
+ sz = head.szPage;
+ sz = (sz&0xfe00) + ((sz&0x0001)<<16);
+ iOff = walFrameOffset(iFrame, sz) + WAL_FRAME_HDRSIZE + 40;
+ rc = sqlite3OsRead(pWal->apWalFd[iWal],aNew,sizeof(aNew),iOff);
+ if( rc==SQLITE_OK && memcmp(aOld, aNew, sizeof(aNew)) ){
+ u32 iFrame = walConflictFrame(pWal, sLoc.iZero+i);
+ aConflict[SQLITE_COMMIT_CONFLICT_PGNO] = 1;
+ aConflict[SQLITE_COMMIT_CONFLICT_FRAME] = iFrame;
+ rc = SQLITE_BUSY_SNAPSHOT;
+ }
+ }else if( sqlite3BitvecTestNotNull(pAllRead, sLoc.aPgno[i-1]) ){
+ u32 iFrame = walConflictFrame(pWal, sLoc.iZero+i);
+ aConflict[SQLITE_COMMIT_CONFLICT_PGNO] = sLoc.aPgno[i-1];
+ aConflict[SQLITE_COMMIT_CONFLICT_FRAME] = iFrame;
+ rc = SQLITE_BUSY_SNAPSHOT;
+ }else
+ if( (pPg = sqlite3PagerLookup(pPg1->pPager, sLoc.aPgno[i-1])) ){
+ /* Page aPgno[i], which is present in the pager cache, has been
+ ** modified since the current CONCURRENT transaction was
+ ** started. However it was not read by the current
+ ** transaction, so is not a conflict. There are two
+ ** possibilities: (a) the page was allocated at the of the file
+ ** by the current transaction or (b) was present in the cache
+ ** at the start of the transaction.
+ **
+ ** For case (a), do nothing. This page will be moved within the
+ ** database file by the commit code to avoid the conflict. The
+ ** call to PagerUnref() is to release the reference grabbed by
+ ** the sqlite3PagerLookup() above.
+ **
+ ** In case (b), drop the page from the cache - otherwise
+ ** following the snapshot upgrade the cache would be
+ ** inconsistent with the database as stored on disk. */
+ if( sqlite3PagerIswriteable(pPg) ){
+ sqlite3PagerUnref(pPg);
+ }else{
+ sqlite3PcacheDrop(pPg);
+ }
+ }
+ }
+ }
+ if( rc!=SQLITE_OK ) break;
+ }
+ }
+ }
}
+ pWal->nPriorFrame = walGetPriorFrame(&pWal->hdr);
return rc;
}
assert( isWalMode2(pWal) || iWal==0 );
- /* Restore the clients cache of the wal-index header to the state it
- ** was in before the client began writing to the database.
- */
- memcpy(&pWal->hdr, (void *)walIndexHdr(pWal), sizeof(WalIndexHdr));
- iNew = walidxGetMxFrame(&pWal->hdr, walidxGetFile(&pWal->hdr));
-
- /* BEGIN CONCURRENT transactions are different, as the header just
- ** memcpy()d into pWal->hdr may not be the same as the current header
- ** when the transaction was started. Instead, pWal->hdr now contains
- ** the header written by the most recent successful COMMIT. Because
- ** Wal.writeLock is set, if this is a BEGIN CONCURRENT transaction,
- ** the rollback must be taking place because an error occurred during
- ** a COMMIT.
- **
- ** The code below is still valid. All frames between (iNew+1) and iMax
- ** must have been written by this transaction before the error occurred.
- ** The exception is in wal2 mode - if the current wal file at the time
- ** of the last COMMIT is not wal file iWal, then the error must have
- ** occurred in WalLockForCommit(), before any pages were written
- ** to the database file. In this case return early. */
+ SEH_TRY {
+ /* Restore the clients cache of the wal-index header to the state it
+ ** was in before the client began writing to the database.
+ */
+ memcpy(&pWal->hdr, (void *)walIndexHdr(pWal), sizeof(WalIndexHdr));
- assert( walidxGetFile(&pWal->hdr)==iWal );
+ iNew = walidxGetMxFrame(&pWal->hdr, walidxGetFile(&pWal->hdr));
-
++
++ /* BEGIN CONCURRENT transactions are different, as the header just
++ ** memcpy()d into pWal->hdr may not be the same as the current header
++ ** when the transaction was started. Instead, pWal->hdr now contains
++ ** the header written by the most recent successful COMMIT. Because
++ ** Wal.writeLock is set, if this is a BEGIN CONCURRENT transaction,
++ ** the rollback must be taking place because an error occurred during
++ ** a COMMIT.
++ **
++ ** The code below is still valid. All frames between (iNew+1) and iMax
++ ** must have been written by this transaction before the error occurred.
++ ** The exception is in wal2 mode - if the current wal file at the time
++ ** of the last COMMIT is not wal file iWal, then the error must have
++ ** occurred in WalLockForCommit(), before any pages were written
++ ** to the database file. In this case return early. */
+#ifndef SQLITE_OMIT_CONCURRENT
- if( bConcurrent ){
- pWal->hdr.aCksum[0]++;
- }
- if( walidxGetFile(&pWal->hdr)!=iWal ){
- assert( bConcurrent && isWalMode2(pWal) );
- return SQLITE_OK;
- }
++ if( bConcurrent ){
++ pWal->hdr.aCksum[0]++;
++ }
++ if( walidxGetFile(&pWal->hdr)!=iWal ){
++ assert( bConcurrent && isWalMode2(pWal) );
++ return SQLITE_OK;
++ }
+#endif
- assert( walidxGetFile(&pWal->hdr)==iWal );
-
- for(iFrame=iNew+1; ALWAYS(rc==SQLITE_OK) && iFrame<=iMax; iFrame++){
- /* This call cannot fail. Unless the page for which the page number
- ** is passed as the second argument is (a) in the cache and
- ** (b) has an outstanding reference, then xUndo is either a no-op
- ** (if (a) is false) or simply expels the page from the cache (if (b)
- ** is false).
- **
- ** If the upper layer is doing a rollback, it is guaranteed that there
- ** are no outstanding references to any page other than page 1. And
- ** page 1 is never written to the log until the transaction is
- ** committed. As a result, the call to xUndo may not fail.
- */
- Pgno pgno;
- if( isWalMode2(pWal) ){
- pgno = walFramePgno2(pWal, iWal, iFrame);
- }else{
- pgno = walFramePgno(pWal, iFrame);
++ assert( walidxGetFile(&pWal->hdr)==iWal );
++
+ for(iFrame=iNew+1; ALWAYS(rc==SQLITE_OK) && iFrame<=iMax; iFrame++){
+ /* This call cannot fail. Unless the page for which the page number
+ ** is passed as the second argument is (a) in the cache and
+ ** (b) has an outstanding reference, then xUndo is either a no-op
+ ** (if (a) is false) or simply expels the page from the cache (if (b)
+ ** is false).
+ **
+ ** If the upper layer is doing a rollback, it is guaranteed that there
+ ** are no outstanding references to any page other than page 1. And
+ ** page 1 is never written to the log until the transaction is
+ ** committed. As a result, the call to xUndo may not fail.
+ */
+ Pgno pgno;
+ if( isWalMode2(pWal) ){
+ pgno = walFramePgno2(pWal, iWal, iFrame);
+ }else{
+ pgno = walFramePgno(pWal, iFrame);
+ }
+ assert( pgno!=1 );
+ rc = xUndo(pUndoCtx, pgno);
}
- assert( pgno!=1 );
- rc = xUndo(pUndoCtx, pgno);
+ if( iMax!=iNew ) walCleanupHash(pWal);
}
- if( iMax!=iNew ) walCleanupHash(pWal);
+ SEH_EXCEPT( rc = SQLITE_IOERR_IN_PAGE; )
}
return rc;
}
/* Read the wal-index header. */
- if( rc==SQLITE_OK ){
- walDisableBlocking(pWal);
- rc = walIndexReadHdr(pWal, &isChanged);
- (void)walEnableBlocking(pWal);
- if( isChanged && pWal->pDbFd->pMethods->iVersion>=3 ){
- sqlite3OsUnfetch(pWal->pDbFd, 0, 0);
- }
- }
-
- /* Copy data from the log to the database file. */
- if( rc==SQLITE_OK ){
- if( (walPagesize(pWal)!=nBuf)
- && ((pWal->hdr.mxFrame2 & 0x7FFFFFFF) || pWal->hdr.mxFrame)
- ){
- rc = SQLITE_CORRUPT_BKPT;
- }else{
- rc = walCheckpoint(pWal, db, eMode2, xBusy2, pBusyArg, sync_flags, zBuf);
+ SEH_TRY {
+ if( rc==SQLITE_OK ){
+ walDisableBlocking(pWal);
+ rc = walIndexReadHdr(pWal, &isChanged);
+ (void)walEnableBlocking(pWal);
+ if( isChanged && pWal->pDbFd->pMethods->iVersion>=3 ){
+ sqlite3OsUnfetch(pWal->pDbFd, 0, 0);
+ }
}
-
- /* If no error occurred, set the output variables. */
- if( rc==SQLITE_OK || rc==SQLITE_BUSY ){
- if( pnLog ){
- *pnLog = walidxGetMxFrame(&pWal->hdr,0)+walidxGetMxFrame(&pWal->hdr,1);
+
+ /* Copy data from the log to the database file. */
+ if( rc==SQLITE_OK ){
- int iCkpt = walidxGetFile(&pWal->hdr);
-
+ if( (walPagesize(pWal)!=nBuf)
+ && ((pWal->hdr.mxFrame2 & 0x7FFFFFFF) || pWal->hdr.mxFrame)
+ ){
+ rc = SQLITE_CORRUPT_BKPT;
+ }else{
+ rc = walCheckpoint(pWal, db, eMode2, xBusy2, pBusyArg, sync_flags,zBuf);
}
- if( pnCkpt ){
- if( isWalMode2(pWal) ){
- if( (int)(walCkptInfo(pWal)->nBackfill) ){
- *pnCkpt = walidxGetMxFrame(&pWal->hdr, !walidxGetFile(&pWal->hdr));
+
+ /* If no error occurred, set the output variables. */
+ if( rc==SQLITE_OK || rc==SQLITE_BUSY ){
+ if( pnLog ){
+ WalIndexHdr *pHdr = &pWal->hdr;
+ *pnLog = walidxGetMxFrame(pHdr, 0) + walidxGetMxFrame(pHdr, 1);
+ }
+ SEH_INJECT_FAULT;
+ if( pnCkpt ){
+ if( isWalMode2(pWal) ){
+ if( (int)(walCkptInfo(pWal)->nBackfill) ){
- *pnCkpt = walidxGetMxFrame(&pWal->hdr, iCkpt);
++ *pnCkpt = walidxGetMxFrame(&pWal->hdr,!walidxGetFile(&pWal->hdr));
+ }else{
+ *pnCkpt = 0;
+ }
}else{
- *pnCkpt = 0;
+ *pnCkpt = walCkptInfo(pWal)->nBackfill;
}
- }else{
- *pnCkpt = walCkptInfo(pWal)->nBackfill;
}
}
}
projects / thirdparty / sqlite.git / commitdiff
