walBusyLock      50646 ext/sqlite3/libsqlite/sqlite3.c         rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(i), 1);
walBusyLock      50660 ext/sqlite3/libsqlite/sqlite3.c      && (rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(0),1))==SQLITE_OK
walBusyLock      50738 ext/sqlite3/libsqlite/sqlite3.c       rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(1), WAL_NREADER-1);
walBusyLock      51913 ext/sqlite3/libsqlite/sqlite3.c     rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_WRITE_LOCK, 1);