osa_adb_get_lock
ret = osa_adb_get_lock(db, locktype);
retval = osa_adb_get_lock(dbc->policy_db, lockmode);
retval = osa_adb_get_lock(dbc->policy_db, KRB5_DB_LOCKMODE_EXCLUSIVE);
krb5_error_code osa_adb_get_lock(osa_adb_db_t db, int mode);