A kind of Pratyākhyāna (1) (formal resolve (vow) of abstinence));
the Pratyākhyāna made in advance, in which penance scheduled to be undertaken during Paryuṣaṇa etc., in future, is done prior to it (so that one can employ oneself in service of the Ācārya (preceptor) etc., during that time.
anāgatakaraṇādanāgataṃ - paryuṣaṇādāvācāryādivaiyāvṛttyākaranāntarāyasadbhāvādārata eva tattapaḥkaraṇaṃ.
(Sthā 10.101 Vṛ Pa 472)