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().
108 lines
3.1 KiB
C
108 lines
3.1 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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* empobj.h: General empire objects.
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*
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* Known contributors to this file:
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* Ron Koenderink, 2006
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* Markus Armbruster, 2006-2008
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*/
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#ifndef EMPOBJ_H
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#define EMPOBJ_H
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#include "commodity.h"
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#include "game.h"
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#include "land.h"
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#include "loan.h"
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#include "lost.h"
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#include "nat.h"
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#include "news.h"
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#include "nuke.h"
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#include "plane.h"
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#include "sect.h"
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#include "ship.h"
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#include "trade.h"
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#include "treaty.h"
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#include "types.h"
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struct empobj {
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/*
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* initial part must match struct emptypedstr
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* valid if EFF_TYPED is set in table's flags
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*/
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short ef_type;
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short uid;
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unsigned seqno;
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time_t timestamp;
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/* end of part matching struct emptypedstr */
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natid own; /* valid if EFF_OWNER is in table's flags */
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coord x; /* valid if EFF_XY is in table's flags */
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coord y; /* valid if EFF_XY is in table's flags */
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signed char type; /* valid for sectors and units */
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/* remaining are valid for units */
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signed char effic;
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signed char mobil;
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unsigned char off;
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short tech;
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char group; /* valid if EFF_GROUP is in table's flags */
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coord opx, opy;
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short mission;
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short radius;
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};
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union empobj_storage {
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short ef_type;
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struct empobj gen;
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struct comstr comm;
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struct gamestr game;
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struct lndstr land;
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struct lonstr loan;
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struct loststr lost;
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struct natstr nat;
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struct nwsstr news;
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struct nukstr nuke;
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struct plnstr plane;
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struct realmstr realm;
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struct sctstr sect;
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struct shpstr ship;
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struct trdstr trade;
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struct trtstr treaty;
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};
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struct empobj_chr;
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#define get_empobj(type, n, p) ef_read((type), (n), (p))
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#define put_empobj(type, n, p) ef_write((type), (n), (p))
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#define get_empobjp(type, n) ((struct empobj *)ef_ptr((type), (n)))
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extern char *obj_nameof(struct empobj *gp);
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extern struct empobj_chr *get_empobj_chr(struct empobj *gp);
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extern char *empobj_chr_name(struct empobj *gp);
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extern int get_empobj_mob_max(int type);
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#endif
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