walBusyLock      45313 ext/sqlite3/libsqlite/sqlite3.c       rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(i), 1);
walBusyLock      45327 ext/sqlite3/libsqlite/sqlite3.c    && (rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(0), 1))==SQLITE_OK
walBusyLock      45399 ext/sqlite3/libsqlite/sqlite3.c       rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(1), WAL_NREADER-1);
walBusyLock      46446 ext/sqlite3/libsqlite/sqlite3.c     rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_WRITE_LOCK, 1);