server/server/swap.C

/*
 * static char *rcsid_swap_c =
 *    "$Id: swap.C,v 1.3 2006-08-29 08:01:38 root Exp $";
 */

/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2002 Mark Wedel & Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    The author can be reached via e-mail to crossfire-devel@real-time.com
*/

#include <global.h>
#ifndef __CEXTRACT__
#include <sproto.h>
#endif
#include <object.h>

/* This writes out information on all the temporary maps.  It is called by
 * swap_map below.
 */
static void write_map_log(void) 
{
    FILE *fp;
    mapstruct *map;
    char buf[MAX_BUF];
    long current_time=time(NULL);

    sprintf(buf,"%s/temp.maps", settings.localdir);
    if (!(fp=fopen(buf,"w"))) {
        LOG(llevError,"Could not open %s for writing\n", buf);
        return;
    }
    for (map=first_map; map!=NULL; map=map->next) {
        /* If tmpname is null, it is probably a unique player map,
         * so don't save information on it.
         */
        if (map->in_memory != MAP_IN_MEMORY && (map->tmpname !=NULL) &&
            (strncmp(map->path,"/random",7))) {
            /* the 0 written out is a leftover from the lock number for
             * unique items and second one is from encounter maps.
             * Keep using it so that old temp files continue
             * to work.
             */
                fprintf(fp,"%s:%s:%ld:0:0:%d:0:%d\n", map->path, map->tmpname,
                    (
                      map->reset_time == -1
                         ? (long unsigned) -1
                         : map->reset_time-current_time
                    ),
                    map->difficulty,
                    map->darkness);
        }
    }
    fclose(fp);
}

void read_map_log(void) 
{
    FILE *fp;
    mapstruct *map;
    char buf[MAX_BUF],*cp,*cp1;
    int do_los, darkness, lock;
    long sec =  seconds();


    sprintf(buf,"%s/temp.maps", settings.localdir);
    if (!(fp=fopen(buf,"r"))) {
        LOG(llevDebug,"Could not open %s for reading\n", buf);
        return;
    }
    while (fgets(buf, MAX_BUF, fp)!=NULL) {
        map=get_linked_map();
        /* scanf doesn't work all that great on strings, so we break
         * out that manually.  strdup is used for tmpname, since other
         * routines will try to free that pointer.
         */
        cp=strchr(buf,':');
        *cp++='\0';
        strcpy(map->path, buf);
        cp1=strchr(cp,':');
        *cp1++='\0';
        map->tmpname=strdup_local(cp);

        /* Lock is left over from the lock items - we just toss it now.
         * We use it twice - second one is from encounter, but as we
         * don't care about the value, this works fine
         */
        sscanf(cp1,"%d:%d:%d:%hd:%d:%d\n",
                    &map->reset_time, &lock,
                    &lock, &map->difficulty, &do_los,
                    &darkness);


        map->in_memory=MAP_SWAPPED;
        map->darkness=darkness;

        /* When the reset time is saved out, it is adjusted so that
         * the current time is subtracted (thus, it is saved as number
         * of seconds from current time that it should reset).  We need
         * to add in the current seconds for this to work right.
         * On metalforge, strange behavior was observed with really high
         * reset times - I don't know how they got to that state, 
         * but easy enough to do some sanity checking here.
         */
        map->reset_time += sec;
        if (map->reset_time > (sec + MAP_MAXRESET))
            map->reset_time = 0;

    }
    fclose(fp);
}

void swap_map(mapstruct *map) {
    player *pl;

    if(map->in_memory != MAP_IN_MEMORY) {
        LOG(llevError,"Tried to swap out map which was not in memory.\n");
        return;
    }
    for(pl=first_player;pl!=NULL;pl=pl->next)
        if(pl->ob == NULL || (!(QUERY_FLAG(pl->ob,FLAG_REMOVED)) && pl->ob->map == map))
            break;

    if(pl != NULL) {
        LOG(llevDebug,"Wanted to swap out map with player.\n");
        return;
    }
    remove_all_pets(map); /* Give them a chance to follow */

    /* Update the reset time.  Only do this is STAND_STILL is not set */
    if (!map->fixed_resettime)
        set_map_reset_time(map);

    /* If it is immediate reset time, don't bother saving it - just get
     * rid of it right away.
     */
    if (map->reset_time <= seconds()) {
        LOG(llevDebug,"Resetting map %s.\n",map->path);
        INVOKE_MAP (RESET, map);
        delete_map(map);
        return;
    }

    if (new_save_map (map, 0) == -1) {
        LOG(llevError, "Failed to swap map %s.\n", map->path);
        /* need to reset the in_memory flag so that delete map will also
         * free the objects with it.
         */
        map->in_memory = MAP_IN_MEMORY;
        delete_map(map);
    } else {
        INVOKE_MAP (SWAPOUT, map);
        free_map(map,1);
    }

    if (settings.recycle_tmp_maps == TRUE)
        write_map_log();
}

void check_active_maps(void) {
    mapstruct *map, *next;

    for(map=first_map;map!=NULL;map=next) {
        next = map->next;
        if(map->in_memory != MAP_IN_MEMORY)
            continue;
        if(!map->timeout)
            continue;
        if( --(map->timeout) > 0)
            continue;
        /* If LWM is set, we only swap maps out when we run out of objects */
#ifndef MAX_OBJECTS_LWM
        swap_map(map);
#endif
    }
}

/*
 * map_least_timeout() returns the map with the lowest timeout variable (not 0)
 */

mapstruct *map_least_timeout(char *except_level) {
  mapstruct *map, *chosen=NULL;
  int timeout = MAP_MAXTIMEOUT + 1;
  for(map = first_map;map != NULL; map = map->next)
    if(map->in_memory == MAP_IN_MEMORY && strcmp (map->path, except_level) &&
       map->timeout && map->timeout < timeout)
        chosen = map, timeout = map->timeout;
  return chosen;
}

/*
 * players_on_map(): will be replaced by map->players when I'm satisfied
 * that the variable is always correct.
 * If show_all is true, we show everyone.  If not, we don't show hidden
 * players (dms)
 */

int players_on_map(mapstruct *m, int show_all) {
  player *pl;
  int nr=0;
  for(pl=first_player;pl!=NULL;pl=pl->next)
    if(pl->ob != NULL && !QUERY_FLAG(pl->ob,FLAG_REMOVED) && pl->ob->map==m &&
       (show_all || !pl->hidden))
      nr++;
  return nr;
}

/*
 * flush_old_maps():
 * Removes tmp-files of maps which are going to be reset next time
 * they are visited.
 * This is very useful if the tmp-disk is very full.
 */
void flush_old_maps(void) {

    mapstruct *m, *oldmap;
    long sec;
    sec = seconds();

    m= first_map;
    while (m) {
        /* There can be cases (ie death) where a player leaves a map and the timeout
         * is not set so it isn't swapped out.
         */
        if ((m->in_memory == MAP_IN_MEMORY) && (m->timeout==0) &&
            !players_on_map(m,TRUE)) {
            set_map_timeout(m);
        }

        /* per player unique maps are never really reset.  However, we do want
         * to perdiocially remove the entries in the list of active maps - this
         * generates a cleaner listing if a player issues the map commands, and
         * keeping all those swapped out per player unique maps also has some
         * memory and cpu consumption.
         * We do the cleanup here because there are lots of places that call
         * swap map, and doing it within swap map may cause problems as
         * the functions calling it may not expect the map list to change
         * underneath them.
         */
        if ((m->unique || m->templatemap) && m->in_memory == MAP_SWAPPED) {
            LOG(llevDebug,"Resetting map %s.\n",m->path);
            oldmap = m;
            m = m->next;
            delete_map(oldmap);
        }
        else if(m->in_memory != MAP_SWAPPED || m->tmpname == NULL ||
           sec < m->reset_time) {
            m = m->next;
        }
        else {
            LOG(llevDebug,"Resetting map %s.\n",m->path);
            INVOKE_MAP (RESET, m);
            clean_tmp_map(m);
            oldmap = m;
            m = m->next;
            delete_map(oldmap);
        }
    }
}
Revision:	1.4
Committed:	Mon Sep 4 11:08:00 2006 UTC (17 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+1 -28 lines
Log Message:	Changes... - alternative shstr representation, saves code - use glibs splice memory allocator (seems slower) - use simpler memory/lifetime management for objects, no recycling
#	Content
1	/*
2	* static char *rcsid_swap_c =
3	* "$Id: swap.C,v 1.3 2006-08-29 08:01:38 root Exp $";
4	*/
5
6	/*
7	CrossFire, A Multiplayer game for X-windows
8
9	Copyright (C) 2002 Mark Wedel & Crossfire Development Team
10	Copyright (C) 1992 Frank Tore Johansen
11
12	This program is free software; you can redistribute it and/or modify
13	it under the terms of the GNU General Public License as published by
14	the Free Software Foundation; either version 2 of the License, or
15	(at your option) any later version.
16
17	This program is distributed in the hope that it will be useful,
18	but WITHOUT ANY WARRANTY; without even the implied warranty of
19	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20	GNU General Public License for more details.
21
22	You should have received a copy of the GNU General Public License
23	along with this program; if not, write to the Free Software
24	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26	The author can be reached via e-mail to crossfire-devel@real-time.com
27	*/
28
29	#include <global.h>
30	#ifndef __CEXTRACT__
31	#include <sproto.h>
32	#endif
33	#include <object.h>
34
35	/* This writes out information on all the temporary maps. It is called by
36	* swap_map below.
37	*/
38	static void write_map_log(void)
39	{
40	FILE *fp;
41	mapstruct *map;
42	char buf[MAX_BUF];
43	long current_time=time(NULL);
44
45	sprintf(buf,"%s/temp.maps", settings.localdir);
46	if (!(fp=fopen(buf,"w"))) {
47	LOG(llevError,"Could not open %s for writing\n", buf);
48	return;
49	}
50	for (map=first_map; map!=NULL; map=map->next) {
51	/* If tmpname is null, it is probably a unique player map,
52	* so don't save information on it.
53	*/
54	if (map->in_memory != MAP_IN_MEMORY && (map->tmpname !=NULL) &&
55	(strncmp(map->path,"/random",7))) {
56	/* the 0 written out is a leftover from the lock number for
57	* unique items and second one is from encounter maps.
58	* Keep using it so that old temp files continue
59	* to work.
60	*/
61	fprintf(fp,"%s:%s:%ld:0:0:%d:0:%d\n", map->path, map->tmpname,
62	(
63	map->reset_time == -1
64	? (long unsigned) -1
65	: map->reset_time-current_time
66	),
67	map->difficulty,
68	map->darkness);
69	}
70	}
71	fclose(fp);
72	}
73
74	void read_map_log(void)
75	{
76	FILE *fp;
77	mapstruct *map;
78	char buf[MAX_BUF],cp,cp1;
79	int do_los, darkness, lock;
80	long sec = seconds();
81
82
83	sprintf(buf,"%s/temp.maps", settings.localdir);
84	if (!(fp=fopen(buf,"r"))) {
85	LOG(llevDebug,"Could not open %s for reading\n", buf);
86	return;
87	}
88	while (fgets(buf, MAX_BUF, fp)!=NULL) {
89	map=get_linked_map();
90	/* scanf doesn't work all that great on strings, so we break
91	* out that manually. strdup is used for tmpname, since other
92	* routines will try to free that pointer.
93	*/
94	cp=strchr(buf,':');
95	*cp++='\0';
96	strcpy(map->path, buf);
97	cp1=strchr(cp,':');
98	*cp1++='\0';
99	map->tmpname=strdup_local(cp);
100
101	/* Lock is left over from the lock items - we just toss it now.
102	* We use it twice - second one is from encounter, but as we
103	* don't care about the value, this works fine
104	*/
105	sscanf(cp1,"%d:%d:%d:%hd:%d:%d\n",
106	&map->reset_time, &lock,
107	&lock, &map->difficulty, &do_los,
108	&darkness);
109
110
111	map->in_memory=MAP_SWAPPED;
112	map->darkness=darkness;
113
114	/* When the reset time is saved out, it is adjusted so that
115	* the current time is subtracted (thus, it is saved as number
116	* of seconds from current time that it should reset). We need
117	* to add in the current seconds for this to work right.
118	* On metalforge, strange behavior was observed with really high
119	* reset times - I don't know how they got to that state,
120	* but easy enough to do some sanity checking here.
121	*/
122	map->reset_time += sec;
123	if (map->reset_time > (sec + MAP_MAXRESET))
124	map->reset_time = 0;
125
126	}
127	fclose(fp);
128	}
129
130	void swap_map(mapstruct *map) {
131	player *pl;
132
133	if(map->in_memory != MAP_IN_MEMORY) {
134	LOG(llevError,"Tried to swap out map which was not in memory.\n");
135	return;
136	}
137	for(pl=first_player;pl!=NULL;pl=pl->next)
138	if(pl->ob == NULL \|\| (!(QUERY_FLAG(pl->ob,FLAG_REMOVED)) && pl->ob->map == map))
139	break;
140
141	if(pl != NULL) {
142	LOG(llevDebug,"Wanted to swap out map with player.\n");
143	return;
144	}
145	remove_all_pets(map); /* Give them a chance to follow */
146
147	/* Update the reset time. Only do this is STAND_STILL is not set */
148	if (!map->fixed_resettime)
149	set_map_reset_time(map);
150
151	/* If it is immediate reset time, don't bother saving it - just get
152	* rid of it right away.
153	*/
154	if (map->reset_time <= seconds()) {
155	LOG(llevDebug,"Resetting map %s.\n",map->path);
156	INVOKE_MAP (RESET, map);
157	delete_map(map);
158	return;
159	}
160
161	if (new_save_map (map, 0) == -1) {
162	LOG(llevError, "Failed to swap map %s.\n", map->path);
163	/* need to reset the in_memory flag so that delete map will also
164	* free the objects with it.
165	*/
166	map->in_memory = MAP_IN_MEMORY;
167	delete_map(map);
168	} else {
169	INVOKE_MAP (SWAPOUT, map);
170	free_map(map,1);
171	}
172
173	if (settings.recycle_tmp_maps == TRUE)
174	write_map_log();
175	}
176
177	void check_active_maps(void) {
178	mapstruct map, next;
179
180	for(map=first_map;map!=NULL;map=next) {
181	next = map->next;
182	if(map->in_memory != MAP_IN_MEMORY)
183	continue;
184	if(!map->timeout)
185	continue;
186	if( --(map->timeout) > 0)
187	continue;
188	/* If LWM is set, we only swap maps out when we run out of objects */
189	#ifndef MAX_OBJECTS_LWM
190	swap_map(map);
191	#endif
192	}
193	}
194
195	/*
196	* map_least_timeout() returns the map with the lowest timeout variable (not 0)
197	*/
198
199	mapstruct map_least_timeout(char except_level) {
200	mapstruct map, chosen=NULL;
201	int timeout = MAP_MAXTIMEOUT + 1;
202	for(map = first_map;map != NULL; map = map->next)
203	if(map->in_memory == MAP_IN_MEMORY && strcmp (map->path, except_level) &&
204	map->timeout && map->timeout < timeout)
205	chosen = map, timeout = map->timeout;
206	return chosen;
207	}
208
209	/*
210	* players_on_map(): will be replaced by map->players when I'm satisfied
211	* that the variable is always correct.
212	* If show_all is true, we show everyone. If not, we don't show hidden
213	* players (dms)
214	*/
215
216	int players_on_map(mapstruct *m, int show_all) {
217	player *pl;
218	int nr=0;
219	for(pl=first_player;pl!=NULL;pl=pl->next)
220	if(pl->ob != NULL && !QUERY_FLAG(pl->ob,FLAG_REMOVED) && pl->ob->map==m &&
221	(show_all \|\| !pl->hidden))
222	nr++;
223	return nr;
224	}
225
226	/*
227	* flush_old_maps():
228	* Removes tmp-files of maps which are going to be reset next time
229	* they are visited.
230	* This is very useful if the tmp-disk is very full.
231	*/
232	void flush_old_maps(void) {
233
234	mapstruct m, oldmap;
235	long sec;
236	sec = seconds();
237
238	m= first_map;
239	while (m) {
240	/* There can be cases (ie death) where a player leaves a map and the timeout
241	* is not set so it isn't swapped out.
242	*/
243	if ((m->in_memory == MAP_IN_MEMORY) && (m->timeout==0) &&
244	!players_on_map(m,TRUE)) {
245	set_map_timeout(m);
246	}
247
248	/* per player unique maps are never really reset. However, we do want
249	* to perdiocially remove the entries in the list of active maps - this
250	* generates a cleaner listing if a player issues the map commands, and
251	* keeping all those swapped out per player unique maps also has some
252	* memory and cpu consumption.
253	* We do the cleanup here because there are lots of places that call
254	* swap map, and doing it within swap map may cause problems as
255	* the functions calling it may not expect the map list to change
256	* underneath them.
257	*/
258	if ((m->unique \|\| m->templatemap) && m->in_memory == MAP_SWAPPED) {
259	LOG(llevDebug,"Resetting map %s.\n",m->path);
260	oldmap = m;
261	m = m->next;
262	delete_map(oldmap);
263	}
264	else if(m->in_memory != MAP_SWAPPED \|\| m->tmpname == NULL \|\|
265	sec < m->reset_time) {
266	m = m->next;
267	}
268	else {
269	LOG(llevDebug,"Resetting map %s.\n",m->path);
270	INVOKE_MAP (RESET, m);
271	clean_tmp_map(m);
272	oldmap = m;
273	m = m->next;
274	delete_map(oldmap);
275	}
276	}
277	}