Markus Armbruster
2fa5f65257
Oops when a stale copy is written back, i.e. the processor was yielded since the copy was made. Such bugs are difficult to spot. Sequence numbers catch them when they do actual harm (they also catch different bugs). Generation numbers catch them even when they don't. New ef_generation to count generations. Call new ef_make_stale() to increment it whenever the processor may be yielded. New struct emptypedstr member generation. To conserve space, make it a bit-field of twelve bits, i.e. generations are only recorded modulo 2^12. Make sure all members of unit empobj_storage share it. It is only used in copies; its value on disk and in the cache is meaningless. Copies with generation other than ef_generation are stale. Stale copies that are a multiple of 2^12 generations old can't be detected, but that is sufficiently improbable. Set generation to ef_generation by calling new ef_mark_fresh() when making copies in ef_read() and ef_blank(). nav_ship() and fltp_to_list() make copies without going through ef_read(), and therefore need to call ef_mark_fresh() as well. Also call it in obj_changed() to make check_sect_ok() & friends freshen their argument when it is unchanged. New must_be_fresh() oopses when its argument is stale. Call it in ef_write() to catch write back of stale copies.
71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2009, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* trade.h: Definitions for trading units/ships/planes in a time delay
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* system
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*
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* Known contributors to this file:
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* Dave Pare
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* Pat Loney, 1992
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* Steve McClure, 1996
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*/
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#ifndef TRADE_H
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#define TRADE_H
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#include <time.h>
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#include "types.h"
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struct trdstr {
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/* initial part must match struct empobj */
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signed ef_type: 8;
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unsigned trd_seqno: 12;
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unsigned trd_generation: 12;
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int trd_uid;
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time_t trd_timestamp;
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natid trd_owner;
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/* end of part matching struct empobj */
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short trd_type;
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int trd_unitid;
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long trd_price;
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int trd_maxbidder;
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time_t trd_markettime;
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coord trd_x;
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coord trd_y;
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};
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extern int trade_check_ok(struct trdstr *, union empobj_storage *);
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extern int trade_check_item_ok(union empobj_storage *);
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extern char *trade_nameof(struct trdstr *, union empobj_storage *);
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extern int trade_desc(struct trdstr *, union empobj_storage *);
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extern int trade_getitem(struct trdstr *, union empobj_storage *);
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#define gettrade(n, p) ef_read(EF_TRADE, (n), (p))
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#define puttrade(n, p) ef_write(EF_TRADE, (n), (p))
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#define gettradep(n) ((struct trdstr *)ef_ptr(EF_TRADE, (n)))
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#endif
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