535   WalIndexHdr *pSnapshot;    /* Start transaction here if not NULL */  member
2793    && (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0)  in walTryBeginRead()
2835   if( pWal->pSnapshot && pWal->pSnapshot->mxFrame<mxFrame ){  in walTryBeginRead()
2836     mxFrame = pWal->pSnapshot->mxFrame;  in walTryBeginRead()
3016   WalIndexHdr *pSnapshot = pWal->pSnapshot;  in sqlite3WalBeginReadTransaction()  local
3022   if( pSnapshot ){  in sqlite3WalBeginReadTransaction()
3023     if( memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){  in sqlite3WalBeginReadTransaction()
3056     if( pSnapshot && memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){  in sqlite3WalBeginReadTransaction()
3073       assert( pInfo->aReadMark[pWal->readLock]<=pSnapshot->mxFrame );  in sqlite3WalBeginReadTransaction()
3081       if( !memcmp(pSnapshot->aSalt, pWal->hdr.aSalt, sizeof(pWal->hdr.aSalt))  in sqlite3WalBeginReadTransaction()
3082        && pSnapshot->mxFrame>=pInfo->nBackfillAttempted  in sqlite3WalBeginReadTransaction()
3085         memcpy(&pWal->hdr, pSnapshot, sizeof(WalIndexHdr));  in sqlite3WalBeginReadTransaction()
3107     assert( pSnapshot );  in sqlite3WalBeginReadTransaction()
4077   sqlite3_snapshot *pSnapshot  in sqlite3WalSnapshotOpen()  argument
4079   pWal->pSnapshot = (WalIndexHdr*)pSnapshot;  in sqlite3WalSnapshotOpen()
4110 int sqlite3WalSnapshotCheck(Wal *pWal, sqlite3_snapshot *pSnapshot){  in sqlite3WalSnapshotCheck()  argument
4114     WalIndexHdr *pNew = (WalIndexHdr*)pSnapshot;  in sqlite3WalSnapshotCheck()