Markus Armbruster
536ef0b0a2
This oopses on output dependency violations, e.g. two threads doing a read-modify-write without synchronization, or the one thread nesting several read-modify-writes. Such bugs are difficult to spot, and tend to be abusable. I figure we have quite a few of them. New struct emptypedstr member seqno. Make sure all members of unit empobj_storage share it. Initialize it in files: main() and file_sct_init(). Set it in ef_blank() and new ef_set_uid() by calling new get_seqno(). Use ef_set_uid() when copying objects: swaps(), doland(), doship(), doplane(), dounit(), delete_old_news(). Step it in ef_write() by calling new new_seqno(). Factor do_read() out of fillcache() to make it available for get_seqno().
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2008, 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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short ef_type;
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short trd_uid;
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unsigned trd_seqno;
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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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short 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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