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.
192 lines
7 KiB
C
192 lines
7 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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* ship.h: Definitions for things having to do with ships
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*
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* Known contributors to this file:
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* Dave Pare
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* Thomas Ruschak, 1992
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* Ken Stevens, 1995
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* Steve McClure, 1998
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* Markus Armbruster, 2004-2009
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*/
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#ifndef SHIP_H
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#define SHIP_H
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#include <time.h>
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#include "item.h"
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#include "queue.h"
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#include "retreat.h"
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#include "types.h"
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#define SHP_TYPE_MAX 46
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#define SHIP_MINEFF 20
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/* bit masks for the autonav mode flags */
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#define AN_AUTONAV bit(2)
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#define AN_STANDBY bit(3)
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#define AN_LOADING bit(4)
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#define AN_SCUTTLE bit(5) /* Auto-scuttle of trade ships */
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/* TMAX is the number of cargo holds a ship use in the autonav code. */
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#define TMAX 6
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#define MAXSHPPATH 28
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#define MAXSHPNAMLEN 24
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struct shpstr {
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/* initial part must match struct empobj */
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signed ef_type: 8;
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unsigned shp_seqno: 12;
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unsigned shp_generation: 12;
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int shp_uid; /* unit it (ship #) */
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time_t shp_timestamp; /* Last time this ship was touched. */
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natid shp_own; /* owner's country num */
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coord shp_x; /* x location in abs coords */
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coord shp_y; /* y location in abs coords */
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signed char shp_type; /* index in mchr[] */
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signed char shp_effic; /* 0% to 100% */
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signed char shp_mobil; /* mobility units */
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unsigned char shp_off; /* repairs stopped? */
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short shp_tech; /* tech level ship was built at */
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char shp_fleet; /* group membership */
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coord shp_opx, shp_opy; /* Op sector coords */
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short shp_mission; /* mission code */
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short shp_radius; /* mission radius */
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/* end of part matching struct empobj */
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coord shp_destx[2]; /* location for ship destination */
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coord shp_desty[2];
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i_type shp_tstart[TMAX]; /* what goods to pick up at start point */
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i_type shp_tend[TMAX]; /* what goods to pick up at end point */
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short shp_lstart[TMAX]; /* How much do we pick up at the start */
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short shp_lend[TMAX]; /* How much do we pick up at the end */
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unsigned char shp_autonav; /* autonavigation flags */
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short shp_item[I_MAX+1]; /* amount of items on board */
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short shp_pstage; /* plague stage */
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short shp_ptime; /* how many etus remain in this stage */
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short shp_access; /* Last tick mob was updated (MOB_ACCESS) */
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unsigned char shp_mobquota; /* mobility quota */
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char shp_path[MAXSHPPATH];
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int shp_follow;
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char shp_name[MAXSHPNAMLEN]; /* name set with the "name" command */
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coord shp_orig_x;
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coord shp_orig_y; /* Where we were built */
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natid shp_orig_own; /* Who built us */
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int shp_rflags; /* When do I retreat? */
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char shp_rpath[RET_LEN]; /* retreat path */
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};
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struct mchrstr {
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short m_item[I_MAX+1]; /* load limit */
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int m_lcm; /* units of lcm to build */
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int m_hcm; /* units of hcm to build */
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int m_armor; /* how well armored it is */
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int m_speed; /* how fast it can go */
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int m_visib; /* how well it can be seen */
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int m_vrnge; /* how well it can see */
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int m_frnge; /* how far it can fire */
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int m_glim; /* how many guns it can fire */
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unsigned char m_nxlight; /* maximum number of xlight planes */
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unsigned char m_nchoppers; /* maximum number of choppers */
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char *m_name; /* full name of type of ship */
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int m_tech; /* tech required to build */
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int m_cost; /* how much it costs to build */
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long m_flags; /* what special things can this ship do */
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unsigned char m_nplanes; /* maximum number of planes this ship holds */
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unsigned char m_nland; /* maximum number of units this ship holds */
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signed char m_type; /* index in mchr[] */
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};
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#define M_FOOD bit(0) /* catch that fish! */
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#define M_TORP bit(1) /* fire torpedoes */
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#define M_DCH bit(2) /* drop depth charges on subs */
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#define M_FLY bit(3) /* launch and recover planes */
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/* M_MSL will be automatically set in init_mchr() if m_nplanes > 0
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and M_FLY is not set */
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#define M_MSL bit(4) /* launch missiles */
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#define M_OIL bit(5) /* drill for oil */
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#define M_SONAR bit(6) /* locate submarines */
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#define M_MINE bit(7) /* drop mines */
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#define M_SWEEP bit(8) /* clean up the mines */
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#define M_SUB bit(9) /* a submarine */
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/* unused bit(10) */
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#define M_LAND bit(11) /* allows full landing ability */
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#define M_SUBT bit(12) /* allows torping of other subs */
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#define M_TRADE bit(13) /* is a trade ship */
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#define M_SEMILAND bit(14) /* can land 1/4 */
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/* unused bit(15) */
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/* unused bit(16) */
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/* unused bit(17) */
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#define M_SUPPLY bit(18) /* Can supply units/sects/ships */
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#define M_CANAL bit(19) /* Can navigate a canal (BIG CITY) */
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#define M_ANTIMISSILE bit(20) /* Shoot down missile */
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#define getship(n, p) ef_read(EF_SHIP, (n), (p))
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#define putship(n, p) ef_write(EF_SHIP, (n), (p))
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#define getshipp(n) ((struct shpstr *)ef_ptr(EF_SHIP, (n)))
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extern struct mchrstr mchr[SHP_TYPE_MAX + 2];
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/* Work required for building 100% */
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#define SHP_BLD_WORK(lcm, hcm) (20 + (lcm) + 2 * (hcm))
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/* return codes from shp_check_nav */
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#define CN_NAVIGABLE 0
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#define CN_LANDLOCKED 1
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#define CN_CONSTRUCTION 2
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#define CN_ERROR -1
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enum {
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SHP_AIROPS_EFF = 50, /* min. efficiency for air ops */
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SHP_TORP_SHELLS = 3 /* number of shells used by a torpedo */
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};
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extern int m_armor(struct mchrstr *, int);
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extern int m_speed(struct mchrstr *, int);
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extern int m_visib(struct mchrstr *, int);
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extern int m_frnge(struct mchrstr *, int);
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extern int m_glim(struct mchrstr *, int);
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extern int shp_armor(struct shpstr *);
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extern int shp_speed(struct shpstr *);
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extern int shp_visib(struct shpstr *);
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extern int shp_frnge(struct shpstr *);
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extern int shp_glim(struct shpstr *);
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extern int shp_nplane(struct shpstr *, int *, int *, int *);
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extern int shp_nland(struct shpstr *);
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extern int shp_dchrg(struct shpstr *);
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extern int shp_fire(struct shpstr *);
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extern int shp_torp(struct shpstr *, int);
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extern double shp_fire_range(struct shpstr *);
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extern int shp_usable_guns(struct shpstr *);
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extern double shp_torp_hitchance(struct shpstr *, int);
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#endif
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