*
* ---
*
- * path.c: Empire/A* Interface code. Provides callbacks for A* code and
- * a sector cache to speed things up. Define BP_STATS for sector
- * cache statistics, AS_STATS for A* statistics.
+ * path.c: Empire/A* Interface code.
+ * Define AS_STATS for A* statistics.
*
* Known contributors to this file:
* Phil Lapsley, 1991
#include "gen.h"
#include "optlist.h"
-/* STM - The server is now reliant on the sector file being
- * memory mapped for other things. So, this code has been
- * setup to have the sector hashing #ifdef'd instead so that
- * we don't have to do runtime checking. If someone moves
- * the sector file to me non-memory mapped, they have larger
- * problems than this, and can just turn this back on. Then
- * again, their performance will be so bad going to a file
- * all the time, it won't matter. */
-
-/*#define DO_EFF_MEM_CHECKING*/
-
-
-/* XXX won't need sector hash when sect file is memory mapped */
-
-#define BP_SCTHASHSIZE 128 /* sector cache hash table size */
#define BP_ASHASHSIZE 128 /* A* queue hash table size */
#define BP_NEIGHBORS 6 /* max number of neighbors */
-#ifdef DO_EFF_MEM_CHECKING
-struct sctcache {
- coord x, y;
- struct sctstr *sp;
- struct sctcache *next;
-};
-#endif /* DO_EFF_MEM_CHECKING */
-
struct bestp {
-#ifdef DO_EFF_MEM_CHECKING
- struct sctcache *sctcachetab[BP_SCTHASHSIZE];
-#endif
int sctcache_hits;
int sctcache_misses;
int bp_mobtype;
struct as_data *adp;
};
-#ifdef DO_EFF_MEM_CHECKING
-
-static struct sctstr *bp_getsect(struct bestp *bp, coord x, coord y);
-static struct sctstr *bp_sctcache_get(struct bestp *bp, coord x, coord y);
-static void bp_sctcache_set(struct bestp *bp, coord x, coord y,
- struct sctstr *sp);
-static void bp_sctcache_zap(struct bestp *bp);
-
-#endif /* DO_EFF_MEM_CHECKING */
-
static int bp_path(struct as_path *pp, s_char *buf);
static int bp_neighbors(struct as_coord c, struct as_coord *cp,
s_char *pp);
if (mybestpath == 0)
mybestpath = (struct bestp *)bp_init();
adp = mybestpath->adp;
-#ifdef DO_EFF_MEM_CHECKING
- bp_sctcache_zap(mybestpath);
-#endif
ap = as_find_cachepath(from->sct_x, from->sct_y, to->sct_x, to->sct_y);
if (ap == NULL) {
adp->from.x = from->sct_x;
static int
bp_neighbors(struct as_coord c, struct as_coord *cp, s_char *pp)
{
-#ifdef DO_EFF_MEM_CHECKING
- struct bestp *bp = (struct bestp *)pp;
-#endif /* DO_EFF_MEM_CHECKING */
coord x, y;
coord nx, ny;
int n = 0, q;
x = c.x;
y = c.y;
-#ifdef DO_EFF_MEM_CHECKING
- if ((ep->flags & EFF_MEM) == 0) {
- from = bp_getsect(bp, x, y);
- } else {
-#endif /* DO_EFF_MEM_CHECKING */
- sx = XNORM(x);
- sy = YNORM(y);
- offset = (sy * WORLD_X + sx) / 2;
- from = (struct sctstr *)(ep->cache + ep->size * offset);
-#ifdef DO_EFF_MEM_CHECKING
- }
-#endif /* DO_EFF_MEM_CHECKING */
+ sx = XNORM(x);
+ sy = YNORM(y);
+ offset = (sy * WORLD_X + sx) / 2;
+ from = (struct sctstr *)(ep->cache + ep->size * offset);
if (neighsects == (struct sctstr **)0)
ssp = (struct sctstr **)&tsp[0];
ny = y + diroff[q][1];
sx = XNORM(nx);
sy = YNORM(ny);
-#ifdef DO_EFF_MEM_CHECKING
- if ((ep->flags & EFF_MEM) == 0) {
- sp = bp_getsect(bp, nx, ny);
- } else {
-#endif /* DO_EFF_MEM_CHECKING */
- offset = (sy * WORLD_X + sx) / 2;
- sp = (struct sctstr *)(ep->cache + ep->size * offset);
- /* We can only save in our neighbor cache if the
- sector file is in memory */
- *ssp = sp;
-#ifdef DO_EFF_MEM_CHECKING
- }
-#endif /* DO_EFF_MEM_CHECKING */
+ offset = (sy * WORLD_X + sx) / 2;
+ sp = (struct sctstr *)(ep->cache + ep->size * offset);
+ *ssp = sp;
} else {
sp = *ssp;
sx = XNORM(sp->sct_x);
float cost;
int x, y, sx, sy, offset;
-#ifdef DO_EFF_MEM_CHECKING
- if ((ep->flags & EFF_MEM) == 0) {
- ts = bp_getsect(bp, (coord)to.x, (coord)to.y);
- } else {
-#endif /* DO_EFF_MEM_CHECKING */
- x = to.x;
- y = to.y;
- sx = XNORM(x);
- sy = YNORM(y);
- offset = (sy * WORLD_X + sx) / 2;
- ts = (struct sctstr *)(ep->cache + ep->size * offset);
-#ifdef DO_EFF_MEM_CHECKING
- }
-#endif /* DO_EFF_MEM_CHECKING */
+ x = to.x;
+ y = to.y;
+ sx = XNORM(x);
+ sy = YNORM(y);
+ offset = (sy * WORLD_X + sx) / 2;
+ ts = (struct sctstr *)(ep->cache + ep->size * offset);
cost = sector_mcost(ts, bp->bp_mobtype);
return (cost);
}
(coord)to.x, (coord)to.y));
}
-#ifdef DO_EFF_MEM_CHECKING
-
-/*
- * Get a sector from the cache. If it's not in the cache,
- * get it from disk and add it to the cache.
- */
-static struct sctstr *
-bp_getsect(struct bestp *bp, coord x, coord y)
-{
- struct sctstr *sp;
-
- sp = bp_sctcache_get(bp, x, y);
- if (sp == NULL) {
- sp = (struct sctstr *)malloc(sizeof(*sp));
- getsect(x, y, sp);
- bp_sctcache_set(bp, x, y, sp);
- bp->sctcache_misses++;
- } else {
- bp->sctcache_hits++;
- }
- return (sp);
-}
-
-/*
- * Get a sector from the cache; return NULL if it's not there.
- */
-static struct sctstr *
-bp_sctcache_get(struct bestp *bp, coord x, coord y)
-{
- int hashval;
- struct as_coord c;
- struct sctcache *hp;
-
- c.x = x;
- c.y = y;
- hashval = bp_coord_hash(c) % BP_SCTHASHSIZE;
- for (hp = bp->sctcachetab[hashval]; hp; hp = hp->next) {
- if (hp->x == x && hp->y == y)
- return (hp->sp);
- }
- return (NULL);
-}
-
-/*
- * Put a sector in the cache.
- */
-static void
-bp_sctcache_set(struct bestp *bp, coord x, coord y, struct sctstr *sp)
-{
- int hashval;
- struct as_coord c;
- struct sctcache *hp;
-
- hp = (struct sctcache *)calloc(1, sizeof(*hp));
- hp->x = x;
- hp->y = y;
- hp->sp = sp;
- c.x = x;
- c.y = y;
- hashval = bp_coord_hash(c) % BP_SCTHASHSIZE;
- hp->next = bp->sctcachetab[hashval];
- bp->sctcachetab[hashval] = hp;
-}
-
-/*
- * Zap the cache and reset statistics.
- */
-static void
-bp_sctcache_zap(struct bestp *bp)
-{
- register struct sctcache *hp;
- register struct sctcache *np;
- register int i;
-
- for (i = 0; i < BP_SCTHASHSIZE; i++) {
- for (hp = bp->sctcachetab[i]; hp; hp = np) {
- np = hp->next;
- free(hp->sp);
- free(hp);
- }
- bp->sctcachetab[i] = NULL;
- }
- bp->sctcache_hits = 0;
- bp->sctcache_misses = 0;
-}
-
-#endif /* DO_EFF_MEM_CHECKING */
-
/*
* Hash a coordinate into an integer.
*/
projects / empserver / commitdiff