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Overview
Comment:Add another PAGERTRACE() macro to show when pages are added to Pager.pAllRead. No impact on production builds.
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SHA3-256:11054cf5e8c24ef9ca869d558a0ca6750b56103c3b3793dc4afcef75192ea943
User & Date: drh 2017-08-11 20:22:30
Wiki:begin-concurrent
Context
2017-08-11
21:16
Fix a problem allowing a conflicting transaction to be committed in the case where more than one 32KB shared-memory page has been written to since the transaction was started. check-in: 38dd9b50 user: dan tags: begin-concurrent
20:22
Add another PAGERTRACE() macro to show when pages are added to Pager.pAllRead. No impact on production builds. check-in: 11054cf5 user: drh tags: begin-concurrent
19:31
Add a PAGERTRACE() macro to log when frames are written into the WAL file. This is for analysis only and is a no-op for production builds. check-in: 39f39e3d user: drh tags: begin-concurrent
Changes
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Changes to src/pager.c.

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#ifndef SQLITE_OMIT_CONCURRENT
  /* If this is an CONCURRENT transaction and the page being read was
  ** present in the database file when the transaction was opened,
  ** mark it as read in the pAllRead vector.  */
  pPg = 0;
  if( pPager->pAllRead && pgno<=pPager->dbOrigSize ){

    rc = sqlite3BitvecSet(pPager->pAllRead, pgno);
    if( rc!=SQLITE_OK ) goto pager_acquire_err;
  }
#endif

  if( pgno==0 ) return SQLITE_CORRUPT_BKPT;
  pBase = sqlite3PcacheFetch(pPager->pPCache, pgno, 3);







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#ifndef SQLITE_OMIT_CONCURRENT
  /* If this is an CONCURRENT transaction and the page being read was
  ** present in the database file when the transaction was opened,
  ** mark it as read in the pAllRead vector.  */
  pPg = 0;
  if( pPager->pAllRead && pgno<=pPager->dbOrigSize ){
    PAGERTRACE(("USING page %d\n", pgno));
    rc = sqlite3BitvecSet(pPager->pAllRead, pgno);
    if( rc!=SQLITE_OK ) goto pager_acquire_err;
  }
#endif

  if( pgno==0 ) return SQLITE_CORRUPT_BKPT;
  pBase = sqlite3PcacheFetch(pPager->pPCache, pgno, 3);