520   u8 ckptLock;               /* True if holding a checkpoint lock */  member
1234   assert( pWal->ckptLock==1 || pWal->ckptLock==0 );  in walIndexRecover()
1238   iLock = WAL_ALL_BUT_WRITE + pWal->ckptLock;  in walIndexRecover()
1792   assert( pWal->ckptLock && pWal->hdr.mxFrame>0 );  in walIteratorInit()
3019   assert( pWal->ckptLock==0 );  in sqlite3WalBeginReadTransaction()
3042     pWal->ckptLock = 1;  in sqlite3WalBeginReadTransaction()
3106   if( pWal->ckptLock ){  in sqlite3WalBeginReadTransaction()
3109     pWal->ckptLock = 0;  in sqlite3WalBeginReadTransaction()
3859   assert( pWal->ckptLock==0 );  in sqlite3WalCheckpoint()
3886     pWal->ckptLock = 1;  in sqlite3WalCheckpoint()
3951   if( pWal->ckptLock ){  in sqlite3WalCheckpoint()
3953     pWal->ckptLock = 0;  in sqlite3WalCheckpoint()