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.
107 lines
3.1 KiB
C
107 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) 1986-2009, 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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* 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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signed ef_type: 8;
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unsigned seqno: 12;
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unsigned generation: 12;
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int uid;
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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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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 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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