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.
72 lines
2.4 KiB
C
72 lines
2.4 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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* game.h: The game file
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*
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* Known contributors to this file:
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* Markus Armbruster, 2007-2009
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*/
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#ifndef GAME_H
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#define GAME_H
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#include <time.h>
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struct gamestr {
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/* initial part must match struct empobj */
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signed ef_type: 8;
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unsigned game_seqno: 12;
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unsigned game_generation: 12;
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int game_uid;
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time_t game_timestamp;
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/* end of part matching struct empobj */
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char game_upd_disable; /* updates disabled? */
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char game_down; /* playing disabled? */
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/*
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* The Empire clock.
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* Access it through game_tick_tick(), or else it'll be late.
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*/
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short game_turn; /* turn number */
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short game_tick; /* elapsed etus in this turn */
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time_t game_rt; /* when game_tick last ticked */
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};
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#define putgame() ef_write(EF_GAME, 0, ef_ptr(EF_GAME, 0))
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#define getgamep() ((struct gamestr *)ef_ptr(EF_GAME, 0))
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extern void game_ctrl_update(int);
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extern int updates_disabled(void);
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extern void game_ctrl_play(int);
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extern int game_play_disabled(void);
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extern void game_note_bsanct(void);
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extern void game_record_update(time_t);
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extern struct gamestr *game_tick_tick(void);
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extern int game_tick_to_now(short *);
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extern int game_step_a_tick(struct gamestr *, short *);
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extern int game_reset_tick(short *);
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#endif
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