1 |
/* Copyright (c) 1995 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* ambient.c - routines dealing with ambient (inter-reflected) component. |
9 |
*/ |
10 |
|
11 |
#include "ray.h" |
12 |
|
13 |
#include "octree.h" |
14 |
|
15 |
#include "otypes.h" |
16 |
|
17 |
#include "ambient.h" |
18 |
|
19 |
#include "random.h" |
20 |
|
21 |
#ifndef OCTSCALE |
22 |
#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
23 |
#endif |
24 |
#ifndef AMBVWT |
25 |
#define AMBVWT 250 /* relative ambient value weight (# calcs) */ |
26 |
#endif |
27 |
|
28 |
typedef struct ambtree { |
29 |
AMBVAL *alist; /* ambient value list */ |
30 |
struct ambtree *kid; /* 8 child nodes */ |
31 |
} AMBTREE; /* ambient octree */ |
32 |
|
33 |
extern CUBE thescene; /* contains space boundaries */ |
34 |
|
35 |
extern char *shm_boundary; /* memory sharing boundary */ |
36 |
|
37 |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
38 |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
39 |
|
40 |
double maxarad; /* maximum ambient radius */ |
41 |
double minarad; /* minimum ambient radius */ |
42 |
|
43 |
static AMBTREE atrunk; /* our ambient trunk node */ |
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|
45 |
static FILE *ambfp = NULL; /* ambient file pointer */ |
46 |
static int nunflshed = 0; /* number of unflushed ambient values */ |
47 |
|
48 |
#ifndef SORT_THRESH |
49 |
#ifdef BIGMEM |
50 |
#define SORT_THRESH ((9L<<20)/sizeof(AMBVAL)) |
51 |
#else |
52 |
#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL)) |
53 |
#endif |
54 |
#endif |
55 |
#ifndef SORT_INTVL |
56 |
#define SORT_INTVL (SORT_THRESH*256) |
57 |
#endif |
58 |
#ifndef MAX_SORT_INTVL |
59 |
#define MAX_SORT_INTVL (SORT_INTVL<<4) |
60 |
#endif |
61 |
|
62 |
static COLOR avsum = BLKCOLOR; /* computed ambient value sum */ |
63 |
static unsigned int nambvals = 0; /* number of computed ambient values */ |
64 |
static unsigned long ambclock = 0; /* ambient access clock */ |
65 |
static unsigned long lastsort = 0; /* time of last value sort */ |
66 |
static long sortintvl = SORT_INTVL; /* time until next sort */ |
67 |
|
68 |
#define MAXACLOCK (1L<<30) /* clock turnover value */ |
69 |
/* |
70 |
* Track access times unless we are sharing ambient values |
71 |
* through memory on a multiprocessor, when we want to avoid |
72 |
* claiming our own memory (copy on write). |
73 |
*/ |
74 |
#define tracktime (shm_boundary == NULL || ambfp == NULL) |
75 |
|
76 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
77 |
|
78 |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
79 |
|
80 |
extern long ftell(), lseek(); |
81 |
static int initambfile(), avsave(), avinsert(), sortambvals(); |
82 |
static AMBVAL *avstore(); |
83 |
#ifdef F_SETLKW |
84 |
static aflock(); |
85 |
#endif |
86 |
|
87 |
|
88 |
setambres(ar) /* set ambient resolution */ |
89 |
int ar; |
90 |
{ |
91 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
92 |
/* set min & max radii */ |
93 |
if (ar <= 0) { |
94 |
minarad = 0; |
95 |
maxarad = thescene.cusize / 2.0; |
96 |
} else { |
97 |
minarad = thescene.cusize / ar; |
98 |
maxarad = 64 * minarad; /* heuristic */ |
99 |
if (maxarad > thescene.cusize / 2.0) |
100 |
maxarad = thescene.cusize / 2.0; |
101 |
} |
102 |
if (minarad <= FTINY) |
103 |
minarad = 10*FTINY; |
104 |
if (maxarad <= minarad) |
105 |
maxarad = 64 * minarad; |
106 |
} |
107 |
|
108 |
|
109 |
setambacc(newa) /* set ambient accuracy */ |
110 |
double newa; |
111 |
{ |
112 |
double ambdiff; |
113 |
|
114 |
if (newa < 0.0) |
115 |
newa = 0.0; |
116 |
ambdiff = fabs(newa - ambacc); |
117 |
if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0) |
118 |
sortambvals(1); /* rebuild tree */ |
119 |
} |
120 |
|
121 |
|
122 |
setambient(afile) /* initialize calculation */ |
123 |
char *afile; |
124 |
{ |
125 |
long headlen; |
126 |
AMBVAL amb; |
127 |
/* init ambient limits */ |
128 |
setambres(ambres); |
129 |
setambacc(ambacc); |
130 |
if (afile == NULL) |
131 |
return; |
132 |
if (ambacc <= FTINY) { |
133 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
134 |
afile); |
135 |
error(WARNING, errmsg); |
136 |
return; |
137 |
} |
138 |
/* open ambient file */ |
139 |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
140 |
initambfile(0); |
141 |
headlen = ftell(ambfp); |
142 |
while (readambval(&amb, ambfp)) |
143 |
avinsert(avstore(&amb)); |
144 |
/* align */ |
145 |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
146 |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
147 |
initambfile(1); |
148 |
else { |
149 |
sprintf(errmsg, "cannot open ambient file \"%s\"", afile); |
150 |
error(SYSTEM, errmsg); |
151 |
} |
152 |
nunflshed++; /* lie */ |
153 |
ambsync(); |
154 |
} |
155 |
|
156 |
|
157 |
ambnotify(obj) /* record new modifier */ |
158 |
OBJECT obj; |
159 |
{ |
160 |
static int hitlimit = 0; |
161 |
register OBJREC *o = objptr(obj); |
162 |
register char **amblp; |
163 |
|
164 |
if (hitlimit || !ismodifier(o->otype)) |
165 |
return; |
166 |
for (amblp = amblist; *amblp != NULL; amblp++) |
167 |
if (!strcmp(o->oname, *amblp)) { |
168 |
if (ambset[0] >= MAXASET) { |
169 |
error(WARNING, "too many modifiers in ambient list"); |
170 |
hitlimit++; |
171 |
return; /* should this be fatal? */ |
172 |
} |
173 |
insertelem(ambset, obj); |
174 |
return; |
175 |
} |
176 |
} |
177 |
|
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|
179 |
ambient(acol, r, nrm) /* compute ambient component for ray */ |
180 |
COLOR acol; |
181 |
register RAY *r; |
182 |
FVECT nrm; |
183 |
{ |
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static int rdepth = 0; /* ambient recursion */ |
185 |
double d; |
186 |
|
187 |
if (ambdiv <= 0) /* no ambient calculation */ |
188 |
goto dumbamb; |
189 |
/* check number of bounces */ |
190 |
if (rdepth >= ambounce) |
191 |
goto dumbamb; |
192 |
/* check ambient list */ |
193 |
if (ambincl != -1 && r->ro != NULL && |
194 |
ambincl != inset(ambset, r->ro->omod)) |
195 |
goto dumbamb; |
196 |
|
197 |
if (ambacc <= FTINY) { /* no ambient storage */ |
198 |
rdepth++; |
199 |
d = doambient(acol, r, r->rweight, NULL, NULL); |
200 |
rdepth--; |
201 |
if (d <= FTINY) |
202 |
goto dumbamb; |
203 |
return; |
204 |
} |
205 |
/* resort memory? */ |
206 |
sortambvals(0); |
207 |
/* get ambient value */ |
208 |
setcolor(acol, 0.0, 0.0, 0.0); |
209 |
d = sumambient(acol, r, nrm, rdepth, |
210 |
&atrunk, thescene.cuorg, thescene.cusize); |
211 |
if (d > FTINY) { |
212 |
scalecolor(acol, 1.0/d); |
213 |
return; |
214 |
} |
215 |
rdepth++; /* need to cache new value */ |
216 |
d = makeambient(acol, r, nrm, rdepth-1); |
217 |
rdepth--; |
218 |
if (d > FTINY) |
219 |
return; |
220 |
dumbamb: /* return global value */ |
221 |
copycolor(acol, ambval); |
222 |
#if AMBVWT |
223 |
if (nambvals == 0) |
224 |
return; |
225 |
scalecolor(acol, (double)AMBVWT); |
226 |
addcolor(acol, avsum); /* average in computations */ |
227 |
d = 1.0/(AMBVWT+nambvals); |
228 |
scalecolor(acol, d); |
229 |
#endif |
230 |
} |
231 |
|
232 |
|
233 |
double |
234 |
sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */ |
235 |
COLOR acol; |
236 |
register RAY *r; |
237 |
FVECT rn; |
238 |
int al; |
239 |
AMBTREE *at; |
240 |
FVECT c0; |
241 |
double s; |
242 |
{ |
243 |
double d, e1, e2, wt, wsum; |
244 |
COLOR ct; |
245 |
FVECT ck0; |
246 |
int i; |
247 |
register int j; |
248 |
register AMBVAL *av; |
249 |
|
250 |
wsum = 0.0; |
251 |
/* do this node */ |
252 |
for (av = at->alist; av != NULL; av = av->next) { |
253 |
if (tracktime) |
254 |
av->latick = ambclock++; |
255 |
/* |
256 |
* Ambient level test. |
257 |
*/ |
258 |
if (av->lvl > al) /* list sorted, so this works */ |
259 |
break; |
260 |
if (av->weight < r->rweight-FTINY) |
261 |
continue; |
262 |
/* |
263 |
* Ambient radius test. |
264 |
*/ |
265 |
d = av->pos[0] - r->rop[0]; |
266 |
e1 = d * d; |
267 |
d = av->pos[1] - r->rop[1]; |
268 |
e1 += d * d; |
269 |
d = av->pos[2] - r->rop[2]; |
270 |
e1 += d * d; |
271 |
e1 /= av->rad * av->rad; |
272 |
if (e1 > ambacc*ambacc*1.21) |
273 |
continue; |
274 |
/* |
275 |
* Normal direction test. |
276 |
*/ |
277 |
e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight; |
278 |
if (e2 < 0.0) e2 = 0.0; |
279 |
if (e1 + e2 > ambacc*ambacc*1.21) |
280 |
continue; |
281 |
/* |
282 |
* Ray behind test. |
283 |
*/ |
284 |
d = 0.0; |
285 |
for (j = 0; j < 3; j++) |
286 |
d += (r->rop[j] - av->pos[j]) * |
287 |
(av->dir[j] + r->ron[j]); |
288 |
if (d*0.5 < -minarad*ambacc-.001) |
289 |
continue; |
290 |
/* |
291 |
* Jittering final test reduces image artifacts. |
292 |
*/ |
293 |
wt = sqrt(e1) + sqrt(e2); |
294 |
if (wt > ambacc*(.9+.2*urand(9015+samplendx))) |
295 |
continue; |
296 |
if (wt <= 1e-3) |
297 |
wt = 1e3; |
298 |
else |
299 |
wt = 1.0 / wt; |
300 |
wsum += wt; |
301 |
extambient(ct, av, r->rop, rn); |
302 |
scalecolor(ct, wt); |
303 |
addcolor(acol, ct); |
304 |
} |
305 |
if (at->kid == NULL) |
306 |
return(wsum); |
307 |
/* do children */ |
308 |
s *= 0.5; |
309 |
for (i = 0; i < 8; i++) { |
310 |
for (j = 0; j < 3; j++) { |
311 |
ck0[j] = c0[j]; |
312 |
if (1<<j & i) |
313 |
ck0[j] += s; |
314 |
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
315 |
break; |
316 |
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
317 |
break; |
318 |
} |
319 |
if (j == 3) |
320 |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
321 |
} |
322 |
return(wsum); |
323 |
} |
324 |
|
325 |
|
326 |
double |
327 |
makeambient(acol, r, rn, al) /* make a new ambient value */ |
328 |
COLOR acol; |
329 |
register RAY *r; |
330 |
FVECT rn; |
331 |
int al; |
332 |
{ |
333 |
AMBVAL amb; |
334 |
FVECT gp, gd; |
335 |
/* compute weight */ |
336 |
amb.weight = pow(AVGREFL, (double)al); |
337 |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
338 |
amb.weight = r->rweight; |
339 |
/* compute ambient */ |
340 |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
341 |
if (amb.rad <= FTINY) |
342 |
return(0.0); |
343 |
/* store it */ |
344 |
VCOPY(amb.pos, r->rop); |
345 |
VCOPY(amb.dir, r->ron); |
346 |
amb.lvl = al; |
347 |
copycolor(amb.val, acol); |
348 |
VCOPY(amb.gpos, gp); |
349 |
VCOPY(amb.gdir, gd); |
350 |
/* insert into tree */ |
351 |
avsave(&amb); /* and save to file */ |
352 |
if (rn != r->ron) |
353 |
extambient(acol, &amb, r->rop, rn); /* texture */ |
354 |
return(amb.rad); |
355 |
} |
356 |
|
357 |
|
358 |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
359 |
COLOR cr; |
360 |
register AMBVAL *ap; |
361 |
FVECT pv, nv; |
362 |
{ |
363 |
FVECT v1, v2; |
364 |
register int i; |
365 |
double d; |
366 |
|
367 |
d = 1.0; /* zeroeth order */ |
368 |
/* gradient due to translation */ |
369 |
for (i = 0; i < 3; i++) |
370 |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
371 |
/* gradient due to rotation */ |
372 |
VCOPY(v1, ap->dir); |
373 |
fcross(v2, v1, nv); |
374 |
d += DOT(ap->gdir, v2); |
375 |
if (d <= 0.0) { |
376 |
setcolor(cr, 0.0, 0.0, 0.0); |
377 |
return; |
378 |
} |
379 |
copycolor(cr, ap->val); |
380 |
scalecolor(cr, d); |
381 |
} |
382 |
|
383 |
|
384 |
static |
385 |
initambfile(creat) /* initialize ambient file */ |
386 |
int creat; |
387 |
{ |
388 |
extern char *progname, *octname, VersionID[]; |
389 |
|
390 |
#ifdef F_SETLKW |
391 |
aflock(creat ? F_WRLCK : F_RDLCK); |
392 |
#endif |
393 |
#ifdef MSDOS |
394 |
setmode(fileno(ambfp), O_BINARY); |
395 |
#endif |
396 |
setbuf(ambfp, bmalloc(BUFSIZ+8)); |
397 |
if (creat) { /* new file */ |
398 |
newheader("RADIANCE", ambfp); |
399 |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
400 |
progname, colval(ambval,RED), |
401 |
colval(ambval,GRN), colval(ambval,BLU), |
402 |
ambounce, ambacc); |
403 |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
404 |
ambdiv, ambssamp, ambres, |
405 |
octname==NULL ? "" : octname); |
406 |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
407 |
fputformat(AMBFMT, ambfp); |
408 |
putc('\n', ambfp); |
409 |
putambmagic(ambfp); |
410 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
411 |
error(USER, "bad ambient file"); |
412 |
} |
413 |
|
414 |
|
415 |
static |
416 |
avsave(av) /* insert and save an ambient value */ |
417 |
AMBVAL *av; |
418 |
{ |
419 |
avinsert(avstore(av)); |
420 |
if (ambfp == NULL) |
421 |
return; |
422 |
if (writambval(av, ambfp) < 0) |
423 |
goto writerr; |
424 |
if (++nunflshed >= AMBFLUSH) |
425 |
if (ambsync() == EOF) |
426 |
goto writerr; |
427 |
return; |
428 |
writerr: |
429 |
error(SYSTEM, "error writing ambient file"); |
430 |
} |
431 |
|
432 |
|
433 |
static AMBVAL * |
434 |
avstore(aval) /* allocate memory and store aval */ |
435 |
register AMBVAL *aval; |
436 |
{ |
437 |
register AMBVAL *av; |
438 |
|
439 |
if ((av = newambval()) == NULL) |
440 |
error(SYSTEM, "out of memory in avstore"); |
441 |
copystruct(av, aval); |
442 |
av->latick = ambclock; |
443 |
av->next = NULL; |
444 |
addcolor(avsum, av->val); /* add to sum for averaging */ |
445 |
nambvals++; |
446 |
return(av); |
447 |
} |
448 |
|
449 |
|
450 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
451 |
|
452 |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
453 |
|
454 |
|
455 |
static |
456 |
AMBTREE * |
457 |
newambtree() /* allocate 8 ambient tree structs */ |
458 |
{ |
459 |
register AMBTREE *atp, *upperlim; |
460 |
|
461 |
if (atfreelist == NULL) { /* get more nodes */ |
462 |
atfreelist = (AMBTREE *)bmalloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
463 |
if (atfreelist == NULL) |
464 |
return(NULL); |
465 |
/* link new free list */ |
466 |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
467 |
for (atp = atfreelist; atp < upperlim; atp += 8) |
468 |
atp->kid = atp + 8; |
469 |
atp->kid = NULL; |
470 |
} |
471 |
atp = atfreelist; |
472 |
atfreelist = atp->kid; |
473 |
bzero((char *)atp, 8*sizeof(AMBTREE)); |
474 |
return(atp); |
475 |
} |
476 |
|
477 |
|
478 |
static |
479 |
freeambtree(atp) /* free 8 ambient tree structs */ |
480 |
AMBTREE *atp; |
481 |
{ |
482 |
atp->kid = atfreelist; |
483 |
atfreelist = atp; |
484 |
} |
485 |
|
486 |
|
487 |
static |
488 |
avinsert(av) /* insert ambient value in our tree */ |
489 |
register AMBVAL *av; |
490 |
{ |
491 |
register AMBTREE *at; |
492 |
register AMBVAL *ap; |
493 |
AMBVAL avh; |
494 |
FVECT ck0; |
495 |
double s; |
496 |
int branch; |
497 |
register int i; |
498 |
|
499 |
if (av->rad <= FTINY) |
500 |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
501 |
at = &atrunk; |
502 |
VCOPY(ck0, thescene.cuorg); |
503 |
s = thescene.cusize; |
504 |
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
505 |
if (at->kid == NULL) |
506 |
if ((at->kid = newambtree()) == NULL) |
507 |
error(SYSTEM, "out of memory in avinsert"); |
508 |
s *= 0.5; |
509 |
branch = 0; |
510 |
for (i = 0; i < 3; i++) |
511 |
if (av->pos[i] > ck0[i] + s) { |
512 |
ck0[i] += s; |
513 |
branch |= 1 << i; |
514 |
} |
515 |
at = at->kid + branch; |
516 |
} |
517 |
avh.next = at->alist; /* order by increasing level */ |
518 |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
519 |
if (ap->next->lvl >= av->lvl) |
520 |
break; |
521 |
av->next = ap->next; |
522 |
ap->next = av; |
523 |
at->alist = avh.next; |
524 |
} |
525 |
|
526 |
|
527 |
static |
528 |
unloadatree(at, f) /* unload an ambient value tree */ |
529 |
register AMBTREE *at; |
530 |
int (*f)(); |
531 |
{ |
532 |
register AMBVAL *av; |
533 |
register int i; |
534 |
/* transfer values at this node */ |
535 |
for (av = at->alist; av != NULL; av = at->alist) { |
536 |
at->alist = av->next; |
537 |
(*f)(av); |
538 |
} |
539 |
if (at->kid == NULL) |
540 |
return; |
541 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
542 |
unloadatree(at->kid+i, f); |
543 |
freeambtree(at->kid); |
544 |
at->kid = NULL; |
545 |
} |
546 |
|
547 |
|
548 |
static AMBVAL **avlist1, **avlist2; /* ambient value lists for sorting */ |
549 |
static int i_avlist; /* index for lists */ |
550 |
|
551 |
|
552 |
static |
553 |
av2list(av) |
554 |
AMBVAL *av; |
555 |
{ |
556 |
#ifdef DEBUG |
557 |
if (i_avlist >= nambvals) |
558 |
error(CONSISTENCY, "too many ambient values in av2list1"); |
559 |
#endif |
560 |
avlist1[i_avlist] = avlist2[i_avlist] = av; |
561 |
i_avlist++; |
562 |
} |
563 |
|
564 |
|
565 |
static int |
566 |
alatcmp(avp1, avp2) /* compare ambient values for MRA */ |
567 |
AMBVAL **avp1, **avp2; |
568 |
{ |
569 |
return((**avp2).latick - (**avp1).latick); |
570 |
} |
571 |
|
572 |
|
573 |
static int |
574 |
aposcmp(avp1, avp2) /* compare ambient value positions */ |
575 |
AMBVAL **avp1, **avp2; |
576 |
{ |
577 |
return(*avp1 - *avp2); |
578 |
} |
579 |
|
580 |
|
581 |
#ifdef DEBUG |
582 |
static int |
583 |
avlmemi(avaddr) /* find list position from address */ |
584 |
AMBVAL *avaddr; |
585 |
{ |
586 |
register AMBVAL **avlpp; |
587 |
|
588 |
avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2, |
589 |
nambvals, sizeof(AMBVAL *), aposcmp); |
590 |
if (avlpp == NULL) |
591 |
error(CONSISTENCY, "address not found in avlmemi"); |
592 |
return(avlpp - avlist2); |
593 |
} |
594 |
#else |
595 |
#define avlmemi(avaddr) ((AMBVAL **)bsearch((char *)&avaddr,(char *)avlist2, \ |
596 |
nambvals,sizeof(AMBVAL *),aposcmp) - avlist2) |
597 |
#endif |
598 |
|
599 |
|
600 |
static |
601 |
sortambvals(always) /* resort ambient values */ |
602 |
int always; |
603 |
{ |
604 |
AMBTREE oldatrunk; |
605 |
AMBVAL tav, *tap, *pnext; |
606 |
register int i, j; |
607 |
/* see if it's time yet */ |
608 |
if (!always && (ambclock < lastsort+sortintvl || |
609 |
nambvals < SORT_THRESH)) |
610 |
return; |
611 |
/* |
612 |
* The idea here is to minimize memory thrashing |
613 |
* in VM systems by improving reference locality. |
614 |
* We do this by periodically sorting our stored ambient |
615 |
* values in memory in order of most recently to least |
616 |
* recently accessed. This ordering was chosen so that new |
617 |
* ambient values (which tend to be less important) go into |
618 |
* higher memory with the infrequently accessed values. |
619 |
* Since we expect our values to need sorting less |
620 |
* frequently as the process continues, we double our |
621 |
* waiting interval after each call. |
622 |
* This routine is also called by setambacc() with |
623 |
* the "always" parameter set to 1 so that the ambient |
624 |
* tree will be rebuilt with the new accuracy parameter. |
625 |
*/ |
626 |
if (tracktime) { /* allocate pointer arrays to sort */ |
627 |
avlist1 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
628 |
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
629 |
} else |
630 |
avlist1 = avlist2 = NULL; |
631 |
if (avlist2 == NULL) { /* no time tracking -- rebuild tree? */ |
632 |
if (avlist1 != NULL) |
633 |
free((char *)avlist1); |
634 |
if (always) { /* rebuild without sorting */ |
635 |
copystruct(&oldatrunk, &atrunk); |
636 |
atrunk.alist = NULL; |
637 |
atrunk.kid = NULL; |
638 |
unloadatree(&oldatrunk, avinsert); |
639 |
} |
640 |
} else { /* sort memory by last access time */ |
641 |
/* |
642 |
* Sorting memory is tricky because it isn't contiguous. |
643 |
* We have to sort an array of pointers by MRA and also |
644 |
* by memory position. We then copy values in "loops" |
645 |
* to minimize memory hits. Nevertheless, we will visit |
646 |
* everyone at least twice, and this is an expensive process |
647 |
* when we're thrashing, which is when we need to do it. |
648 |
*/ |
649 |
#ifdef DEBUG |
650 |
sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...", |
651 |
nambvals, ambclock); |
652 |
eputs(errmsg); |
653 |
#endif |
654 |
i_avlist = 0; |
655 |
unloadatree(&atrunk, av2list); /* empty current tree */ |
656 |
#ifdef DEBUG |
657 |
if (i_avlist < nambvals) |
658 |
error(CONSISTENCY, "missing ambient values in sortambvals"); |
659 |
#endif |
660 |
qsort((char *)avlist1, nambvals, sizeof(AMBVAL *), alatcmp); |
661 |
qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
662 |
for (i = 0; i < nambvals; i++) { |
663 |
if (avlist1[i] == NULL) |
664 |
continue; |
665 |
tap = avlist2[i]; |
666 |
copystruct(&tav, tap); |
667 |
for (j = i; (pnext = avlist1[j]) != tap; |
668 |
j = avlmemi(pnext)) { |
669 |
copystruct(avlist2[j], pnext); |
670 |
avinsert(avlist2[j]); |
671 |
avlist1[j] = NULL; |
672 |
} |
673 |
copystruct(avlist2[j], &tav); |
674 |
avinsert(avlist2[j]); |
675 |
avlist1[j] = NULL; |
676 |
} |
677 |
free((char *)avlist1); |
678 |
free((char *)avlist2); |
679 |
/* compute new sort interval */ |
680 |
sortintvl = ambclock - lastsort; |
681 |
if (sortintvl >= MAX_SORT_INTVL/2) |
682 |
sortintvl = MAX_SORT_INTVL; |
683 |
else |
684 |
sortintvl <<= 1; /* wait twice as long next */ |
685 |
#ifdef DEBUG |
686 |
eputs("done\n"); |
687 |
#endif |
688 |
} |
689 |
if (ambclock >= MAXACLOCK) |
690 |
ambclock = MAXACLOCK/2; |
691 |
lastsort = ambclock; |
692 |
} |
693 |
|
694 |
|
695 |
#ifdef F_SETLKW |
696 |
|
697 |
static |
698 |
aflock(typ) /* lock/unlock ambient file */ |
699 |
int typ; |
700 |
{ |
701 |
static struct flock fls; /* static so initialized to zeroes */ |
702 |
|
703 |
fls.l_type = typ; |
704 |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
705 |
error(SYSTEM, "cannot (un)lock ambient file"); |
706 |
} |
707 |
|
708 |
|
709 |
int |
710 |
ambsync() /* synchronize ambient file */ |
711 |
{ |
712 |
static FILE *ambinp = NULL; |
713 |
static long lastpos = -1; |
714 |
long flen; |
715 |
AMBVAL avs; |
716 |
register int n; |
717 |
|
718 |
if (nunflshed == 0) |
719 |
return(0); |
720 |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
721 |
goto syncend; |
722 |
/* gain exclusive access */ |
723 |
aflock(F_WRLCK); |
724 |
/* see if file has grown */ |
725 |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
726 |
goto seekerr; |
727 |
if (n = flen - lastpos) { /* file has grown */ |
728 |
if (ambinp == NULL) { /* use duplicate filedes */ |
729 |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
730 |
if (ambinp == NULL) |
731 |
error(SYSTEM, "fdopen failed in ambsync"); |
732 |
} |
733 |
if (fseek(ambinp, lastpos, 0) < 0) |
734 |
goto seekerr; |
735 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
736 |
readambval(&avs, ambinp); |
737 |
avinsert(avstore(&avs)); |
738 |
n -= AMBVALSIZ; |
739 |
} |
740 |
/*** seek always as safety measure |
741 |
if (n) ***/ /* alignment */ |
742 |
if (lseek(fileno(ambfp), flen-n, 0) < 0) |
743 |
goto seekerr; |
744 |
} |
745 |
#ifdef DEBUG |
746 |
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
747 |
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
748 |
ambfp->_ptr - ambfp->_base, |
749 |
nunflshed*AMBVALSIZ); |
750 |
error(CONSISTENCY, errmsg); |
751 |
} |
752 |
#endif |
753 |
syncend: |
754 |
n = fflush(ambfp); /* calls write() at last */ |
755 |
if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) |
756 |
goto seekerr; |
757 |
aflock(F_UNLCK); /* release file */ |
758 |
nunflshed = 0; |
759 |
return(n); |
760 |
seekerr: |
761 |
error(SYSTEM, "seek failed in ambsync"); |
762 |
} |
763 |
|
764 |
#else |
765 |
|
766 |
int |
767 |
ambsync() /* flush ambient file */ |
768 |
{ |
769 |
if (nunflshed == 0) |
770 |
return(0); |
771 |
nunflshed = 0; |
772 |
return(fflush(ambfp)); |
773 |
} |
774 |
|
775 |
#endif |