GNUmifluz: LOCKING_INIT

/* \
 * If we are running CDB, this had better be either a write \
 * cursor or an immediate writer. If it's a regular writer, \
 * that means we have an IWRITE lock and we need to upgrade \
 * it to a write lock. \
 */ \
 if (LOCKING((dbp)->dbenv)) { \
 if (!F_ISSET(dbc, DBC_WRITECURSOR | DBC_WRITER)) \
 return(__db_wrlock_err(dbp->dbenv)); \
 \
 if (F_ISSET(dbc, DBC_WRITECURSOR) && \
 (ret = CDB_lock_get((dbp)->dbenv, (dbc)->locker, \
 DB_LOCK_UPGRADE, &(dbc)->lock_dbt, DB_LOCK_WRITE, \
 &(dbc)->mylock)) != 0) \
 return (ret); \
 }