516   i16 readLock;              /* Which read lock is being held.  -1 for none */  member
1543   pRet->readLock = -1;  in sqlite3WalOpen()
1895   assert( pWal->readLock<0 || bLock==0 );  in sqlite3WalWriteLock()
2536   pWal->readLock = 0;  in walBeginShmUnreliable()
2718   assert( pWal->readLock<0 );     /* Not currently locked */  in walTryBeginRead()
2819       pWal->readLock = 0;  in walTryBeginRead()
2915     pWal->readLock = (i16)mxI;  in walTryBeginRead()
2943   assert( pWal->readLock>=0 );  in sqlite3WalSnapshotRecover()
3072       assert( pWal->readLock>0 || pWal->hdr.mxFrame==0 );  in sqlite3WalBeginReadTransaction()
3073       assert( pInfo->aReadMark[pWal->readLock]<=pSnapshot->mxFrame );  in sqlite3WalBeginReadTransaction()
3084         assert( pWal->readLock>0 );  in sqlite3WalBeginReadTransaction()
3121   if( pWal->readLock>=0 ){  in sqlite3WalEndReadTransaction()
3122     walUnlockShared(pWal, WAL_READ_LOCK(pWal->readLock));  in sqlite3WalEndReadTransaction()
3123     pWal->readLock = -1;  in sqlite3WalEndReadTransaction()
3146   assert( pWal->readLock>=0 || pWal->lockError );  in sqlite3WalFindFrame()
3154   if( iLast==0 || (pWal->readLock==0 && pWal->bShmUnreliable==0) ){  in sqlite3WalFindFrame()
3260   if( pWal && ALWAYS(pWal->readLock>=0) ){  in sqlite3WalDbsize()
3295   assert( pWal->readLock>=0 );  in sqlite3WalBeginWriteTransaction()
3445   if( pWal->readLock==0 ){  in walRestartLog()
3469     pWal->readLock = -1;  in walRestartLog()
4011   assert( pWal->readLock>=0 || pWal->lockError );  in sqlite3WalExclusiveMode()
4012   assert( pWal->readLock>=0 || (op<=0 && pWal->exclusiveMode==0) );  in sqlite3WalExclusiveMode()
4017       if( walLockShared(pWal, WAL_READ_LOCK(pWal->readLock))!=SQLITE_OK ){  in sqlite3WalExclusiveMode()
4027     assert( pWal->readLock>=0 );  in sqlite3WalExclusiveMode()
4028     walUnlockShared(pWal, WAL_READ_LOCK(pWal->readLock));  in sqlite3WalExclusiveMode()
4056   assert( pWal->readLock>=0 && pWal->writeLock==0 );  in sqlite3WalSnapshotGet()
4144   assert( pWal==0 || pWal->readLock>=0 );  in sqlite3WalFramesize()