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Overview
Comment:Fix a bad assert related to snapshots.
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SHA1: 767ee30efa5dd469e3a51d4e44cbe473061819b9
User & Date: drh 2015-12-11 01:22:22.051
Context
2015-12-11
03:16
Fix a variable type mismatch problem in the snapshot logic. (check-in: 93fb8010e4 user: drh tags: snapshot-get)
01:22
Fix a bad assert related to snapshots. (check-in: 767ee30efa user: drh tags: snapshot-get)
2015-12-10
22:48
Snapshot documentation updates. Comment changes only - no changes to code. (check-in: ef51a398a0 user: drh tags: snapshot-get)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/wal.c.
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      **
      **    (2)  A checkpoint as been attempted that wrote frames past
      **         pSnapshot->mxFrame into the database file.  Note that the
      **         checkpoint need not have completed for this to cause problems.
      */
      volatile WalCkptInfo *pInfo = walCkptInfo(pWal);

      assert( pWal->readLock>0 );
      assert( pInfo->aReadMark[pWal->readLock]<=pSnapshot->mxFrame );

      /* It is possible that there is a checkpointer thread running 
      ** concurrent with this code. If this is the case, it may be that the
      ** checkpointer has already determined that it will checkpoint 
      ** snapshot X, where X is later in the wal file than pSnapshot, but 
      ** has not yet set the pInfo->nBackfillAttempted variable to indicate 








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      **
      **    (2)  A checkpoint as been attempted that wrote frames past
      **         pSnapshot->mxFrame into the database file.  Note that the
      **         checkpoint need not have completed for this to cause problems.
      */
      volatile WalCkptInfo *pInfo = walCkptInfo(pWal);

      assert( pWal->readLock>0 || pWal->hdr.mxFrame==0 );
      assert( pInfo->aReadMark[pWal->readLock]<=pSnapshot->mxFrame );

      /* It is possible that there is a checkpointer thread running 
      ** concurrent with this code. If this is the case, it may be that the
      ** checkpointer has already determined that it will checkpoint 
      ** snapshot X, where X is later in the wal file than pSnapshot, but 
      ** has not yet set the pInfo->nBackfillAttempted variable to indicate
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