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.
96 lines
3.2 KiB
C
96 lines
3.2 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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* nuke.h: Definitions for things having to do with nukes
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*
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* Known contributors to this file:
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* Dave Pare, 1986
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*/
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#ifndef NUKE_H
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#define NUKE_H
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#include <time.h>
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#include "types.h"
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#define N_MAXNUKE 20
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#define MIN_DRNUKE_CONST 0.001
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struct nukstr {
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/* initial part must match struct empobj */
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signed ef_type: 8;
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unsigned nuk_seqno: 12;
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unsigned nuk_generation: 12;
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int nuk_uid; /* unit id (nuke #) */
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time_t nuk_timestamp; /* Last time this nuke was touched */
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natid nuk_own;
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coord nuk_x, nuk_y; /* current loc of device */
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signed char nuk_type; /* index in nchr[] */
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signed char nuk_effic; /* unused, always 100% */
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signed char nuk_mobil; /* unused, always 0 */
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unsigned char nuk_off; /* repairs stopped? (unused) */
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short nuk_tech; /* nuke's tech level */
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char nuk_stockpile; /* group membership, unused */
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coord nuk_opx, nuk_opy; /* Op sector coords, unused */
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short nuk_mission; /* mission code, unused */
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short nuk_radius; /* mission radius, unused */
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/* end of part matching struct empobj */
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int nuk_plane; /* uid of transporting plane, or -1 */
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};
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struct nchrstr {
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char *n_name; /* warhead unit name */
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int n_lcm; /* costs to build */
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int n_hcm;
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int n_oil;
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int n_rad;
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int n_blast; /* blast radius */
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int n_dam; /* damage at center */
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int n_cost;
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int n_tech; /* tech needed to build */
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int n_weight;
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int n_flags; /* description of capability */
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signed char n_type; /* index in nchr[] */
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};
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#define N_NEUT bit(0) /* Neutron bomb (low damage, high fallout) */
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#define getnuke(n, p) ef_read(EF_NUKE, (n), (p))
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#define putnuke(n, p) ef_write(EF_NUKE, (n), (p))
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#define getnukep(n) ((struct nukstr *)ef_ptr(EF_NUKE, (n)))
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/* Work required for building */
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#define NUK_BLD_WORK(lcm, hcm, oil, rad) \
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(((lcm) + 2 * (hcm) + (oil) + (rad) + 4) / 5)
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extern struct nchrstr nchr[N_MAXNUKE + 1];
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/* src/lib/common/cargo.c */
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extern void nuk_carrier_change(struct nukstr *, int, int, int);
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extern int nuk_on_plane(struct plnstr *);
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#endif
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