WAL_ALL_BUT_WRITE 49977 ext/sqlite3/libsqlite/sqlite3.c   assert( WAL_ALL_BUT_WRITE==WAL_WRITE_LOCK+1 );
WAL_ALL_BUT_WRITE 49978 ext/sqlite3/libsqlite/sqlite3.c   assert( WAL_CKPT_LOCK==WAL_ALL_BUT_WRITE );
WAL_ALL_BUT_WRITE 49980 ext/sqlite3/libsqlite/sqlite3.c   iLock = WAL_ALL_BUT_WRITE + pWal->ckptLock;