- C Version\s3.44.0\sfor\sthe\swal2\sbranch
- D 2023-11-01T12:41:25.442
-C In\sSQLITE_ENABLE_SETLK_TIMEOUT\sbuilds,\suse\sblocking\slocks\sin\splace\sof\ssleep()\scalls\swhen\sopening\sa\sread-transaction.
-D 2023-11-28T17:12:42.879
++C Update\sthis\sbranch\swith\slatest\schanges\sfrom\strunk.
++D 2023-11-28T17:32:30.239
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++F src/vdbeaux.c ac5a0786cdeff1a2d0f82261a17806016c1e460ce6d222f86ebc7e9d9f18d0d1
F src/vdbeblob.c 13f9287b55b6356b4b1845410382d6bede203ceb29ef69388a4a3d007ffacbe5
- F src/vdbemem.c c936e9002af4993b84c4eb7133d6b1190efe46d391cc86117ecd67ba17b1a04b
+ F src/vdbemem.c 0012d5f01cc866833847c2f3ae4c318ac53a1cb3d28acad9c35e688039464cf0
F src/vdbesort.c 237840ca1947511fa59bd4e18b9eeae93f2af2468c34d2427b059f896230a547
F src/vdbetrace.c fe0bc29ebd4e02c8bc5c1945f1d2e6be5927ec12c06d89b03ef2a4def34bf823
F src/vdbevtab.c 2143db7db0ceed69b21422581f434baffc507a08d831565193a7a02882a1b6a7
F src/vtab.c 154725ebecd3bc02f7fbd7ad3974334f73fff76e02a964e828e48a7c5fb7efff
F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
- F src/wal.c ffbca820a2ee9827269488cf8e1356ae66ad1e65da636da4eb4f3fcdf9d6ddd5
-F src/wal.c e5247a3406531b705b44630e9ccf9ca0e5c74955ef19c06fbb146d765c500c20
-F src/wal.h ba252daaa94f889f4b2c17c027e823d9be47ce39da1d3799886bbd51f0490452
++F src/wal.c aa5c6c7198b1e79055c4dd9bccd88b1c7c8f00ab71930f1435f641a7eadcf6d8
+F src/wal.h 97b8a9903387401377b59507e86b93a148ef1ad4e5ce0f23659a12dcdce56af2
F src/walker.c 7c7ea0115345851c3da4e04e2e239a29983b61fb5b038b94eede6aba462640e2
- F src/where.c 313ce81270d2a414672370e1ee74e65949ad620519193d4cac2986d073cbc8a0
+ F src/where.c 1fdc69ce1333e9bd6d7d3df9fa5af1373a3f5bfdd52108d1dbc0ca85a55f777e
F src/whereInt.h 4b38c5889514e3aead3f27d0ee9a26e47c3f150efc59e2a8b4e3bc8835e4d7a1
F src/wherecode.c 5d77db30a2a3dd532492ae882de114edba2fae672622056b1c7fd61f5917a8f1
F src/whereexpr.c dc5096eca5ed503999be3bdee8a90c51361289a678d396a220912e9cb73b3c00
F test/temptable2.test 76821347810ecc88203e6ef0dd6897b6036ac788e9dd3e6b04fd4d1631311a16
F test/temptable3.test d11a0974e52b347e45ee54ef1923c91ed91e4637
F test/temptrigger.test 38f0ca479b1822d3117069e014daabcaacefffcc
-F test/tester.tcl 68454ef88508c196d19e8694daa27bff7107a91857799eaa12f417188ae53ede
+F test/tester.tcl e6b9adcf4e56aa5c658501c10650646fee467b85d51a4ac80263d2cdae3993ba
- F test/testrunner.tcl 14c8b8ece841b1dd17516a0dc9c7ad9b5f4d4db7987974d3fdf66ae56b2a71fa
- F test/testrunner_data.tcl 7f73f93634d32dafc857ed491b840f371113d09fde6a8bfb9e47b938d47b8c85
+ F test/testrunner.tcl e18d71f2e797da808ba6d31335e504ed6b2791581b89287a72b697a2f31b1ea1
+ F test/testrunner_data.tcl e4d5017290a6d5c11785e36cc94c67d8bb950c8cdc2dbe4c1db2a3a583812560
F test/thread001.test a0985c117eab62c0c65526e9fa5d1360dd1cac5b03bde223902763274ce21899
F test/thread002.test c24c83408e35ba5a952a3638b7ac03ccdf1ce4409289c54a050ac4c5f1de7502
F test/thread003.test ee4c9efc3b86a6a2767516a37bd64251272560a7
F tool/merge-test.tcl de76b62f2de2a92d4c1ca4f976bce0aea6899e0229e250479b229b2a1914b176
F tool/mkautoconfamal.sh cbdcf993fa83dccbef7fb77b39cdeb31ef9f77d9d88c9e343b58d35ca3898a6a
F tool/mkccode.tcl 86463e68ce9c15d3041610fedd285ce32a5cf7a58fc88b3202b8b76837650dbe x
- F tool/mkctimec.tcl b2491d5545fc24b1dfa665a7045327c19edc26ac84b5e9b1ed1502d9ae13c6dc x
-F tool/mkctimec.tcl a16682eae5f01f85e5861b2aa215ca0d46b4230658ee25977e02b4508566fb75 x
++F tool/mkctimec.tcl 9edac3f6d9b867cfeb9da44fe2ab6ab9bb2bdfe66a7f171a8035013a15253b95 x
F tool/mkkeywordhash.c b9faa0ae7e14e4dbbcd951cddd786bf46b8a65bb07b129ba8c0cfade723aaffd
F tool/mkmsvcmin.tcl 8897d515ef7f94772322db95a3b6fce6c614d84fe0bdd06ba5a1c786351d5a1d
F tool/mkopcodec.tcl 33d20791e191df43209b77d37f0ff0904620b28465cca6990cf8d60da61a07ef
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 4f65ae2df071d2064ff1494b918c1dee2147e174f79060cd031c25f1aff70a7e 17129ba1ff7f0daf37100ee82d507aef7827cf38de1866e2633096ae6ad81301
- R 9a74cf56684a260fe8a91491d3dc6822
- U drh
- Z 9cbb724885370dd9354637c57e104e3a
-P a0c87ae9d3db914d18e2c8811db0d0ae3ad7b15c63de84fa975efce28bace27e 5fbf3906d272df3eb981f67455eb35f649ad2774cba9fc3f077b28d9bef3f0cb
-R a3e95520ff5d52f362b8ffc8bb5b50fd
-T +closed 5fbf3906d272df3eb981f67455eb35f649ad2774cba9fc3f077b28d9bef3f0cb
++P 470152fd2847296e0fc325fdf098e49c888e99a2332fb45533f976ad85a67d8d 4c055b7a6e4533e1e571773456226ca7038ce372df3eedbbbcd9a81e8652a6cf
++R 2f203e372f781f50a5b21c9b02ebd41a
+ U dan
-Z fe1d300d9f65afce84bb98eff88fc681
++Z 210541985fea5715c3a4748323eb934d
# Remove this line to create a well-formed Fossil manifest.
*/
static int walTryBeginRead(Wal *pWal, int *pChanged, int useWal, int cnt){
volatile WalCkptInfo *pInfo; /* Checkpoint information in wal-index */
- u32 mxReadMark; /* Largest aReadMark[] value */
- int mxI; /* Index of largest aReadMark[] value */
- int i; /* Loop counter */
int rc = SQLITE_OK; /* Return code */
- u32 mxFrame; /* Wal frame to lock to */
+ #ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+ int nBlockTmout = 0;
+ #endif
- assert( pWal->readLock<0 ); /* Not currently locked */
+ assert( pWal->readLock==WAL_LOCK_NONE ); /* Not currently locked */
/* useWal may only be set for read/write connections */
assert( (pWal->readOnly & WAL_SHM_RDONLY)==0 || useWal==0 );
assert( pWal->apWiData[0]!=0 );
pInfo = walCkptInfo(pWal);
SEH_INJECT_FAULT;
- if( !useWal && AtomicLoad(&pInfo->nBackfill)==pWal->hdr.mxFrame
-#ifdef SQLITE_ENABLE_SNAPSHOT
- && (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0)
-#endif
- ){
- /* The WAL has been completely backfilled (or it is empty).
- ** and can be safely ignored.
- */
- rc = walLockShared(pWal, WAL_READ_LOCK(0));
+ if( isWalMode2(pWal) ){
+ /* This connection needs a "part" lock on the current wal file and,
+ ** unless pInfo->nBackfill is set to indicate that it has already been
+ ** checkpointed, a "full" lock on the other wal file. */
+ int iWal = walidxGetFile(&pWal->hdr);
+ int nBackfill = pInfo->nBackfill || walidxGetMxFrame(&pWal->hdr, !iWal)==0;
+ int eLock = 1 + (iWal*2) + (nBackfill==iWal);
+
+ assert( nBackfill==0 || nBackfill==1 );
+ assert( iWal==0 || iWal==1 );
+ assert( iWal!=0 || nBackfill!=1 || eLock==WAL_LOCK_PART1 );
+ assert( iWal!=0 || nBackfill!=0 || eLock==WAL_LOCK_PART1_FULL2 );
+ assert( iWal!=1 || nBackfill!=1 || eLock==WAL_LOCK_PART2 );
+ assert( iWal!=1 || nBackfill!=0 || eLock==WAL_LOCK_PART2_FULL1 );
+
+ rc = walLockShared(pWal, WAL_READ_LOCK(eLock));
+ if( rc!=SQLITE_OK ){
+ return (rc==SQLITE_BUSY ? WAL_RETRY : rc);
+ }
walShmBarrier(pWal);
- if( rc==SQLITE_OK ){
- if( memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr)) ){
- /* It is not safe to allow the reader to continue here if frames
- ** may have been appended to the log before READ_LOCK(0) was obtained.
- ** When holding READ_LOCK(0), the reader ignores the entire log file,
- ** which implies that the database file contains a trustworthy
- ** snapshot. Since holding READ_LOCK(0) prevents a checkpoint from
- ** happening, this is usually correct.
- **
- ** However, if frames have been appended to the log (or if the log
- ** is wrapped and written for that matter) before the READ_LOCK(0)
- ** is obtained, that is not necessarily true. A checkpointer may
- ** have started to backfill the appended frames but crashed before
- ** it finished. Leaving a corrupt image in the database file.
- */
- walUnlockShared(pWal, WAL_READ_LOCK(0));
- return WAL_RETRY;
+ if( memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr)) ){
+ walUnlockShared(pWal, WAL_READ_LOCK(eLock));
+ return WAL_RETRY;
+ }else{
+ pWal->readLock = eLock;
+ }
+ assert( pWal->minFrame==0 && walFramePage(pWal->minFrame)==0 );
+ }else{
+ u32 mxReadMark; /* Largest aReadMark[] value */
+ int mxI; /* Index of largest aReadMark[] value */
+ int i; /* Loop counter */
+ u32 mxFrame; /* Wal frame to lock to */
+ if( !useWal && pInfo->nBackfill==pWal->hdr.mxFrame
+ #ifdef SQLITE_ENABLE_SNAPSHOT
+ && (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0)
+ #endif
+ ){
+ /* The WAL has been completely backfilled (or it is empty).
+ ** and can be safely ignored.
+ */
+ rc = walLockShared(pWal, WAL_READ_LOCK(0));
+ walShmBarrier(pWal);
+ if( rc==SQLITE_OK ){
+ if( memcmp((void *)walIndexHdr(pWal), &pWal->hdr,sizeof(WalIndexHdr)) ){
+ /* It is not safe to allow the reader to continue here if frames
+ ** may have been appended to the log before READ_LOCK(0) was obtained.
+ ** When holding READ_LOCK(0), the reader ignores the entire log file,
+ ** which implies that the database file contains a trustworthy
+ ** snapshot. Since holding READ_LOCK(0) prevents a checkpoint from
+ ** happening, this is usually correct.
+ **
+ ** However, if frames have been appended to the log (or if the log
+ ** is wrapped and written for that matter) before the READ_LOCK(0)
+ ** is obtained, that is not necessarily true. A checkpointer may
+ ** have started to backfill the appended frames but crashed before
+ ** it finished. Leaving a corrupt image in the database file.
+ */
+ walUnlockShared(pWal, WAL_READ_LOCK(0));
+ return WAL_RETRY;
+ }
+ pWal->readLock = 0;
+ return SQLITE_OK;
+ }else if( rc!=SQLITE_BUSY ){
+ return rc;
}
- pWal->readLock = 0;
- return SQLITE_OK;
- }else if( rc!=SQLITE_BUSY ){
- return rc;
}
- }
-
- /* If we get this far, it means that the reader will want to use
- ** the WAL to get at content from recent commits. The job now is
- ** to select one of the aReadMark[] entries that is closest to
- ** but not exceeding pWal->hdr.mxFrame and lock that entry.
- */
- mxReadMark = 0;
- mxI = 0;
- mxFrame = pWal->hdr.mxFrame;
-#ifdef SQLITE_ENABLE_SNAPSHOT
- if( pWal->pSnapshot && pWal->pSnapshot->mxFrame<mxFrame ){
- mxFrame = pWal->pSnapshot->mxFrame;
- }
-#endif
- for(i=1; i<WAL_NREADER; i++){
- u32 thisMark = AtomicLoad(pInfo->aReadMark+i); SEH_INJECT_FAULT;
- if( mxReadMark<=thisMark && thisMark<=mxFrame ){
- assert( thisMark!=READMARK_NOT_USED );
- mxReadMark = thisMark;
- mxI = i;
+
+ /* If we get this far, it means that the reader will want to use
+ ** the WAL to get at content from recent commits. The job now is
+ ** to select one of the aReadMark[] entries that is closest to
+ ** but not exceeding pWal->hdr.mxFrame and lock that entry.
+ */
+ mxReadMark = 0;
+ mxI = 0;
+ mxFrame = pWal->hdr.mxFrame;
+ #ifdef SQLITE_ENABLE_SNAPSHOT
+ if( pWal->pSnapshot && pWal->pSnapshot->mxFrame<mxFrame ){
+ mxFrame = pWal->pSnapshot->mxFrame;
}
- }
- if( (pWal->readOnly & WAL_SHM_RDONLY)==0
- && (mxReadMark<mxFrame || mxI==0)
- ){
+ #endif
for(i=1; i<WAL_NREADER; i++){
- rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
- if( rc==SQLITE_OK ){
- AtomicStore(pInfo->aReadMark+i,mxFrame);
- mxReadMark = mxFrame;
+ u32 thisMark = AtomicLoad(pInfo->aReadMark+i); SEH_INJECT_FAULT;
+ if( mxReadMark<=thisMark && thisMark<=mxFrame ){
+ assert( thisMark!=READMARK_NOT_USED );
+ mxReadMark = thisMark;
mxI = i;
- walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
- break;
- }else if( rc!=SQLITE_BUSY ){
- return rc;
}
}
- }
- if( mxI==0 ){
- assert( rc==SQLITE_BUSY || (pWal->readOnly & WAL_SHM_RDONLY)!=0 );
- return rc==SQLITE_BUSY ? WAL_RETRY : SQLITE_READONLY_CANTINIT;
- }
+ if( (pWal->readOnly & WAL_SHM_RDONLY)==0
+ && (mxReadMark<mxFrame || mxI==0)
+ ){
+ for(i=1; i<WAL_NREADER; i++){
+ rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
+ if( rc==SQLITE_OK ){
+ AtomicStore(pInfo->aReadMark+i,mxFrame);
+ mxReadMark = mxFrame;
+ mxI = i;
+ walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
+ break;
+ }else if( rc!=SQLITE_BUSY ){
+ return rc;
+ }
+ }
+ }
+ if( mxI==0 ){
+ assert( rc==SQLITE_BUSY || (pWal->readOnly & WAL_SHM_RDONLY)!=0 );
+ return rc==SQLITE_BUSY ? WAL_RETRY : SQLITE_READONLY_CANTINIT;
+ }
+
++ (void)walEnableBlockingMs(pWal, nBlockTmout);
+ rc = walLockShared(pWal, WAL_READ_LOCK(mxI));
++ walDisableBlocking(pWal);
+ if( rc ){
- return rc==SQLITE_BUSY ? WAL_RETRY : rc;
++ assert((rc&0xFF)!=SQLITE_BUSY||rc==SQLITE_BUSY||rc==SQLITE_BUSY_TIMEOUT);
++ return (rc&0xFF)==SQLITE_BUSY ? WAL_RETRY : rc;
+
- (void)walEnableBlockingMs(pWal, nBlockTmout);
- rc = walLockShared(pWal, WAL_READ_LOCK(mxI));
- walDisableBlocking(pWal);
- if( rc ){
- assert( (rc&0xFF)!=SQLITE_BUSY||rc==SQLITE_BUSY||rc==SQLITE_BUSY_TIMEOUT );
- return (rc&0xFF)==SQLITE_BUSY ? WAL_RETRY : rc;
- }
- /* Now that the read-lock has been obtained, check that neither the
- ** value in the aReadMark[] array or the contents of the wal-index
- ** header have changed.
- **
- ** It is necessary to check that the wal-index header did not change
- ** between the time it was read and when the shared-lock was obtained
- ** on WAL_READ_LOCK(mxI) was obtained to account for the possibility
- ** that the log file may have been wrapped by a writer, or that frames
- ** that occur later in the log than pWal->hdr.mxFrame may have been
- ** copied into the database by a checkpointer. If either of these things
- ** happened, then reading the database with the current value of
- ** pWal->hdr.mxFrame risks reading a corrupted snapshot. So, retry
- ** instead.
- **
- ** Before checking that the live wal-index header has not changed
- ** since it was read, set Wal.minFrame to the first frame in the wal
- ** file that has not yet been checkpointed. This client will not need
- ** to read any frames earlier than minFrame from the wal file - they
- ** can be safely read directly from the database file.
- **
- ** Because a ShmBarrier() call is made between taking the copy of
- ** nBackfill and checking that the wal-header in shared-memory still
- ** matches the one cached in pWal->hdr, it is guaranteed that the
- ** checkpointer that set nBackfill was not working with a wal-index
- ** header newer than that cached in pWal->hdr. If it were, that could
- ** cause a problem. The checkpointer could omit to checkpoint
- ** a version of page X that lies before pWal->minFrame (call that version
- ** A) on the basis that there is a newer version (version B) of the same
- ** page later in the wal file. But if version B happens to like past
- ** frame pWal->hdr.mxFrame - then the client would incorrectly assume
- ** that it can read version A from the database file. However, since
- ** we can guarantee that the checkpointer that set nBackfill could not
- ** see any pages past pWal->hdr.mxFrame, this problem does not come up.
- */
- pWal->minFrame = AtomicLoad(&pInfo->nBackfill)+1; SEH_INJECT_FAULT;
- walShmBarrier(pWal);
- if( AtomicLoad(pInfo->aReadMark+mxI)!=mxReadMark
- || memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr))
- ){
- walUnlockShared(pWal, WAL_READ_LOCK(mxI));
- return WAL_RETRY;
- }else{
- assert( mxReadMark<=pWal->hdr.mxFrame );
- pWal->readLock = (i16)mxI;
+ }
+ /* Now that the read-lock has been obtained, check that neither the
+ ** value in the aReadMark[] array or the contents of the wal-index
+ ** header have changed.
+ **
+ ** It is necessary to check that the wal-index header did not change
+ ** between the time it was read and when the shared-lock was obtained
+ ** on WAL_READ_LOCK(mxI) was obtained to account for the possibility
+ ** that the log file may have been wrapped by a writer, or that frames
+ ** that occur later in the log than pWal->hdr.mxFrame may have been
+ ** copied into the database by a checkpointer. If either of these things
+ ** happened, then reading the database with the current value of
+ ** pWal->hdr.mxFrame risks reading a corrupted snapshot. So, retry
+ ** instead.
+ **
+ ** Before checking that the live wal-index header has not changed
+ ** since it was read, set Wal.minFrame to the first frame in the wal
+ ** file that has not yet been checkpointed. This client will not need
+ ** to read any frames earlier than minFrame from the wal file - they
+ ** can be safely read directly from the database file.
+ **
+ ** Because a ShmBarrier() call is made between taking the copy of
+ ** nBackfill and checking that the wal-header in shared-memory still
+ ** matches the one cached in pWal->hdr, it is guaranteed that the
+ ** checkpointer that set nBackfill was not working with a wal-index
+ ** header newer than that cached in pWal->hdr. If it were, that could
+ ** cause a problem. The checkpointer could omit to checkpoint
+ ** a version of page X that lies before pWal->minFrame (call that version
+ ** A) on the basis that there is a newer version (version B) of the same
+ ** page later in the wal file. But if version B happens to like past
+ ** frame pWal->hdr.mxFrame - then the client would incorrectly assume
+ ** that it can read version A from the database file. However, since
+ ** we can guarantee that the checkpointer that set nBackfill could not
+ ** see any pages past pWal->hdr.mxFrame, this problem does not come up.
+ */
+ pWal->minFrame = AtomicLoad(&pInfo->nBackfill)+1; SEH_INJECT_FAULT;
+ walShmBarrier(pWal);
+ if( AtomicLoad(pInfo->aReadMark+mxI)!=mxReadMark
+ || memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr))
+ ){
+ walUnlockShared(pWal, WAL_READ_LOCK(mxI));
+ return WAL_RETRY;
+ }else{
+ assert( mxReadMark<=pWal->hdr.mxFrame );
+ pWal->readLock = (i16)mxI;
+ }
-
}
return rc;
}
projects / thirdparty / sqlite.git / commitdiff
