begin_shard.h (2284B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2022 Taler Systems SA 4 5 TALER is free software; you can redistribute it and/or modify it under the 6 terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3, or (at your option) any later version. 8 9 TALER is distributed in the hope that it will be useful, but WITHOUT ANY 10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 11 A PARTICULAR PURPOSE. See the GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License along with 14 TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> 15 */ 16 /** 17 * @file src/include/exchange-database/begin_shard.h 18 * @brief implementation of the begin_shard function for Postgres 19 * @author Christian Grothoff 20 */ 21 #ifndef EXCHANGE_DATABASE_BEGIN_SHARD_H 22 #define EXCHANGE_DATABASE_BEGIN_SHARD_H 23 24 #include "exchangedb_lib.h" 25 26 /** 27 * Function called to grab a work shard on an operation @a op. Takes over an 28 * abandoned shard if there is one, and opens a fresh one otherwise. Runs as 29 * a single statement, so it needs no transaction of its own. 30 * 31 * @param pg the database context 32 * @param job_name name of the operation to grab a word shard for 33 * @param delay how long we intend to hold the shard; also the minimum age of 34 * a shard held by someone else before we may take it over 35 * @param shard_size desired shard size 36 * @param[out] start_row inclusive start row of the shard (returned) 37 * @param[out] end_row exclusive end row of the shard (returned) 38 * @param[out] progress_row row to resume at; equal to @a start_row for a 39 * fresh shard, and further along for a shard taken over from a 40 * worker that got some of it done (returned) 41 * @return transaction status code 42 */ 43 enum GNUNET_DB_QueryStatus 44 TALER_EXCHANGEDB_begin_shard (struct TALER_EXCHANGEDB_PostgresContext *pg, 45 const char *job_name, 46 struct GNUNET_TIME_Relative delay, 47 uint64_t shard_size, 48 uint64_t *start_row, 49 uint64_t *end_row, 50 uint64_t *progress_row); 51 52 #endif