| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: rc3.c,v 2.8 2012/06/12 22:46:45 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Accumulate ray contributions for a set of materials |
| 6 |
* Controlling process for multiple children |
| 7 |
*/ |
| 8 |
|
| 9 |
#include "rcontrib.h" |
| 10 |
#include "platform.h" |
| 11 |
#include "rtprocess.h" |
| 12 |
#include "selcall.h" |
| 13 |
|
| 14 |
/* Modifier contribution queue (results waiting to be output) */ |
| 15 |
typedef struct s_binq { |
| 16 |
RNUMBER ndx; /* index for this entry */ |
| 17 |
RNUMBER nadded; /* accumulated so far */ |
| 18 |
struct s_binq *next; /* next in queue */ |
| 19 |
MODCONT *mca[1]; /* contrib. array (extends struct) */ |
| 20 |
} BINQ; |
| 21 |
|
| 22 |
static BINQ *out_bq = NULL; /* output bin queue */ |
| 23 |
static BINQ *free_bq = NULL; /* free queue entries */ |
| 24 |
|
| 25 |
static struct { |
| 26 |
RNUMBER r1; /* assigned ray starting index */ |
| 27 |
SUBPROC pr; /* PID, i/o descriptors */ |
| 28 |
FILE *infp; /* file pointer to read from process */ |
| 29 |
int nr; /* number rays to sum (0 if free) */ |
| 30 |
} kida[MAXPROCESS]; /* our child processes */ |
| 31 |
|
| 32 |
|
| 33 |
/* Get new bin queue entry */ |
| 34 |
static BINQ * |
| 35 |
new_binq() |
| 36 |
{ |
| 37 |
BINQ *bp; |
| 38 |
int i; |
| 39 |
|
| 40 |
if (free_bq != NULL) { /* something already available? */ |
| 41 |
bp = free_bq; |
| 42 |
free_bq = bp->next; |
| 43 |
bp->next = NULL; |
| 44 |
bp->nadded = 0; |
| 45 |
return(bp); |
| 46 |
} |
| 47 |
/* else allocate fresh */ |
| 48 |
bp = (BINQ *)malloc(sizeof(BINQ) + sizeof(MODCONT *)*(nmods-1)); |
| 49 |
if (bp == NULL) |
| 50 |
goto memerr; |
| 51 |
for (i = nmods; i--; ) { |
| 52 |
MODCONT *mp = (MODCONT *)lu_find(&modconttab,modname[i])->data; |
| 53 |
bp->mca[i] = (MODCONT *)malloc(sizeof(MODCONT) + |
| 54 |
sizeof(DCOLOR)*(mp->nbins-1)); |
| 55 |
if (bp->mca[i] == NULL) |
| 56 |
goto memerr; |
| 57 |
memcpy(bp->mca[i], mp, sizeof(MODCONT)-sizeof(DCOLOR)); |
| 58 |
/* memset(bp->mca[i]->cbin, 0, sizeof(DCOLOR)*mp->nbins); */ |
| 59 |
} |
| 60 |
bp->ndx = 0; |
| 61 |
bp->nadded = 0; |
| 62 |
bp->next = NULL; |
| 63 |
return(bp); |
| 64 |
memerr: |
| 65 |
error(SYSTEM, "out of memory in new_binq()"); |
| 66 |
return(NULL); |
| 67 |
} |
| 68 |
|
| 69 |
|
| 70 |
/* Free a bin queue entry */ |
| 71 |
static void |
| 72 |
free_binq(BINQ *bp) |
| 73 |
{ |
| 74 |
int i; |
| 75 |
|
| 76 |
if (bp == NULL) { /* signal to release our free list */ |
| 77 |
while ((bp = free_bq) != NULL) { |
| 78 |
free_bq = bp->next; |
| 79 |
for (i = nmods; i--; ) |
| 80 |
free(bp->mca[i]); |
| 81 |
/* Note: we don't own bp->mca[i]->binv */ |
| 82 |
free(bp); |
| 83 |
} |
| 84 |
return; |
| 85 |
} |
| 86 |
/* clear sums for next use */ |
| 87 |
/* for (i = nmods; i--; ) |
| 88 |
memset(bp->mca[i]->cbin, 0, sizeof(DCOLOR)*bp->mca[i]->nbins); |
| 89 |
*/ |
| 90 |
bp->ndx = 0; |
| 91 |
bp->next = free_bq; /* push onto free list */ |
| 92 |
free_bq = bp; |
| 93 |
} |
| 94 |
|
| 95 |
|
| 96 |
/* Add modifier values to accumulation record in queue and clear */ |
| 97 |
void |
| 98 |
queue_modifiers() |
| 99 |
{ |
| 100 |
MODCONT *mpin, *mpout; |
| 101 |
int i, j; |
| 102 |
|
| 103 |
if ((accumulate > 0) | (out_bq == NULL)) |
| 104 |
error(CONSISTENCY, "bad call to queue_modifiers()"); |
| 105 |
|
| 106 |
for (i = nmods; i--; ) { |
| 107 |
mpin = (MODCONT *)lu_find(&modconttab,modname[i])->data; |
| 108 |
mpout = out_bq->mca[i]; |
| 109 |
for (j = mpout->nbins; j--; ) |
| 110 |
addcolor(mpout->cbin[j], mpin->cbin[j]); |
| 111 |
memset(mpin->cbin, 0, sizeof(DCOLOR)*mpin->nbins); |
| 112 |
} |
| 113 |
out_bq->nadded++; |
| 114 |
} |
| 115 |
|
| 116 |
|
| 117 |
/* Sum one modifier record into another (updates nadded) */ |
| 118 |
static void |
| 119 |
add_modbin(BINQ *dst, BINQ *src) |
| 120 |
{ |
| 121 |
int i, j; |
| 122 |
|
| 123 |
for (i = nmods; i--; ) { |
| 124 |
MODCONT *mpin = src->mca[i]; |
| 125 |
MODCONT *mpout = dst->mca[i]; |
| 126 |
for (j = mpout->nbins; j--; ) |
| 127 |
addcolor(mpout->cbin[j], mpin->cbin[j]); |
| 128 |
} |
| 129 |
dst->nadded += src->nadded; |
| 130 |
} |
| 131 |
|
| 132 |
|
| 133 |
/* Queue values for later output */ |
| 134 |
static void |
| 135 |
queue_output(BINQ *bp) |
| 136 |
{ |
| 137 |
BINQ *b_last, *b_cur; |
| 138 |
|
| 139 |
if (accumulate <= 0) { /* just accumulating? */ |
| 140 |
if (out_bq == NULL) { |
| 141 |
bp->next = NULL; |
| 142 |
out_bq = bp; |
| 143 |
} else { |
| 144 |
add_modbin(out_bq, bp); |
| 145 |
free_binq(bp); |
| 146 |
} |
| 147 |
return; |
| 148 |
} |
| 149 |
b_last = NULL; /* else insert in output queue */ |
| 150 |
for (b_cur = out_bq; b_cur != NULL && b_cur->ndx < bp->ndx; |
| 151 |
b_cur = b_cur->next) |
| 152 |
b_last = b_cur; |
| 153 |
|
| 154 |
if (b_last != NULL) { |
| 155 |
bp->next = b_cur; |
| 156 |
b_last->next = bp; |
| 157 |
} else { |
| 158 |
bp->next = out_bq; |
| 159 |
out_bq = bp; |
| 160 |
} |
| 161 |
if (accumulate == 1) /* no accumulation? */ |
| 162 |
return; |
| 163 |
b_cur = out_bq; /* else merge accumulation entries */ |
| 164 |
while (b_cur->next != NULL) { |
| 165 |
if (b_cur->nadded >= accumulate || |
| 166 |
(b_cur->ndx-1)/accumulate != |
| 167 |
(b_cur->next->ndx-1)/accumulate) { |
| 168 |
b_cur = b_cur->next; |
| 169 |
continue; |
| 170 |
} |
| 171 |
add_modbin(b_cur, b_cur->next); |
| 172 |
b_last = b_cur->next; |
| 173 |
b_cur->next = b_last->next; |
| 174 |
b_last->next = NULL; |
| 175 |
free_binq(b_last); |
| 176 |
} |
| 177 |
} |
| 178 |
|
| 179 |
|
| 180 |
/* Count number of records ready for output */ |
| 181 |
static int |
| 182 |
queue_ready() |
| 183 |
{ |
| 184 |
int nready = 0; |
| 185 |
BINQ *bp; |
| 186 |
|
| 187 |
if (accumulate <= 0) /* just accumulating? */ |
| 188 |
return(0); |
| 189 |
|
| 190 |
for (bp = out_bq; bp != NULL && bp->nadded >= accumulate && |
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bp->ndx == lastdone+nready*accumulate+1; |
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bp = bp->next) |
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++nready; |
| 194 |
|
| 195 |
return(nready); |
| 196 |
} |
| 197 |
|
| 198 |
|
| 199 |
/* Catch up with output queue by producing ready results */ |
| 200 |
static int |
| 201 |
output_catchup(int nmax) |
| 202 |
{ |
| 203 |
int nout = 0; |
| 204 |
BINQ *bp; |
| 205 |
int i; |
| 206 |
|
| 207 |
if (accumulate <= 0) /* just accumulating? */ |
| 208 |
return(0); |
| 209 |
/* else output ready results */ |
| 210 |
while (out_bq != NULL && out_bq->nadded >= accumulate |
| 211 |
&& out_bq->ndx == lastdone+1) { |
| 212 |
if ((nmax > 0) & (nout >= nmax)) |
| 213 |
break; |
| 214 |
bp = out_bq; /* pop off first entry */ |
| 215 |
out_bq = bp->next; |
| 216 |
bp->next = NULL; |
| 217 |
for (i = 0; i < nmods; i++) /* output record */ |
| 218 |
mod_output(bp->mca[i]); |
| 219 |
end_record(); |
| 220 |
free_binq(bp); /* free this entry */ |
| 221 |
lastdone += accumulate; |
| 222 |
++nout; |
| 223 |
} |
| 224 |
return(nout); |
| 225 |
} |
| 226 |
|
| 227 |
|
| 228 |
/* Put a zero record in results queue & output */ |
| 229 |
void |
| 230 |
put_zero_record(int ndx) |
| 231 |
{ |
| 232 |
BINQ *bp = new_binq(); |
| 233 |
int i; |
| 234 |
|
| 235 |
for (i = nmods; i--; ) |
| 236 |
memset(bp->mca[i]->cbin, 0, sizeof(DCOLOR)*bp->mca[i]->nbins); |
| 237 |
bp->ndx = ndx; |
| 238 |
bp->nadded = 1; |
| 239 |
queue_output(bp); |
| 240 |
output_catchup(0); |
| 241 |
} |
| 242 |
|
| 243 |
|
| 244 |
/* Get results from child process and add to queue */ |
| 245 |
static void |
| 246 |
queue_results(int k) |
| 247 |
{ |
| 248 |
BINQ *bq = new_binq(); /* get results holder */ |
| 249 |
int j; |
| 250 |
|
| 251 |
bq->ndx = kida[k].r1; |
| 252 |
bq->nadded = kida[k].nr; |
| 253 |
/* read from child */ |
| 254 |
for (j = 0; j < nmods; j++) |
| 255 |
if (fread(bq->mca[j]->cbin, sizeof(DCOLOR), bq->mca[j]->nbins, |
| 256 |
kida[k].infp) != bq->mca[j]->nbins) |
| 257 |
error(SYSTEM, "read error from render process"); |
| 258 |
|
| 259 |
queue_output(bq); /* put results in output queue */ |
| 260 |
kida[k].nr = 0; /* mark child as available */ |
| 261 |
} |
| 262 |
|
| 263 |
|
| 264 |
/* callback to set output spec to NULL (stdout) */ |
| 265 |
static int |
| 266 |
set_stdout(const LUENT *le, void *p) |
| 267 |
{ |
| 268 |
(*(MODCONT *)le->data).outspec = NULL; |
| 269 |
return(0); |
| 270 |
} |
| 271 |
|
| 272 |
|
| 273 |
/* Start child processes if we can */ |
| 274 |
int |
| 275 |
in_rchild() |
| 276 |
{ |
| 277 |
int rval; |
| 278 |
|
| 279 |
while (nchild < nproc) { /* fork until target reached */ |
| 280 |
errno = 0; |
| 281 |
rval = open_process(&kida[nchild].pr, NULL); |
| 282 |
if (rval < 0) |
| 283 |
error(SYSTEM, "open_process() call failed"); |
| 284 |
if (rval == 0) { /* if in child, set up & return true */ |
| 285 |
lu_doall(&modconttab, set_stdout, NULL); |
| 286 |
lu_done(&ofiletab); |
| 287 |
while (nchild--) { /* don't share other pipes */ |
| 288 |
close(kida[nchild].pr.w); |
| 289 |
fclose(kida[nchild].infp); |
| 290 |
} |
| 291 |
inpfmt = (sizeof(RREAL)==sizeof(double)) ? 'd' : 'f'; |
| 292 |
outfmt = 'd'; |
| 293 |
header = 0; |
| 294 |
yres = 0; |
| 295 |
raysleft = 0; |
| 296 |
if (accumulate == 1) { |
| 297 |
waitflush = xres = 1; |
| 298 |
account = accumulate = 1; |
| 299 |
} else { /* parent controls accumulation */ |
| 300 |
waitflush = xres = 0; |
| 301 |
account = accumulate = 0; |
| 302 |
} |
| 303 |
return(1); /* return "true" in child */ |
| 304 |
} |
| 305 |
if (rval != PIPE_BUF) |
| 306 |
error(CONSISTENCY, "bad value from open_process()"); |
| 307 |
/* connect to child's output */ |
| 308 |
kida[nchild].infp = fdopen(kida[nchild].pr.r, "rb"); |
| 309 |
if (kida[nchild].infp == NULL) |
| 310 |
error(SYSTEM, "out of memory in in_rchild()"); |
| 311 |
#ifdef getc_unlocked |
| 312 |
flockfile(kida[nchild].infp); /* avoid mutex overhead */ |
| 313 |
#endif |
| 314 |
kida[nchild++].nr = 0; /* mark as available */ |
| 315 |
} |
| 316 |
return(0); /* return "false" in parent */ |
| 317 |
} |
| 318 |
|
| 319 |
|
| 320 |
/* Close child processes */ |
| 321 |
void |
| 322 |
end_children() |
| 323 |
{ |
| 324 |
int status; |
| 325 |
|
| 326 |
while (nchild > 0) { |
| 327 |
nchild--; |
| 328 |
if ((status = close_process(&kida[nchild].pr)) > 0) { |
| 329 |
sprintf(errmsg, |
| 330 |
"rendering process returned bad status (%d)", |
| 331 |
status); |
| 332 |
error(WARNING, errmsg); |
| 333 |
} |
| 334 |
fclose(kida[nchild].infp); |
| 335 |
} |
| 336 |
} |
| 337 |
|
| 338 |
|
| 339 |
/* Wait for the next available child, managing output queue simultaneously */ |
| 340 |
static int |
| 341 |
next_child_nq(int flushing) |
| 342 |
{ |
| 343 |
static struct timeval polling; |
| 344 |
struct timeval *pmode; |
| 345 |
fd_set readset, errset; |
| 346 |
int i, n, nr, nqr; |
| 347 |
|
| 348 |
if (!flushing) /* see if there's one free */ |
| 349 |
for (i = nchild; i--; ) |
| 350 |
if (!kida[i].nr) |
| 351 |
return(i); |
| 352 |
|
| 353 |
nqr = queue_ready(); /* choose blocking mode or polling */ |
| 354 |
if ((nqr > 0) & !flushing) |
| 355 |
pmode = &polling; |
| 356 |
else |
| 357 |
pmode = NULL; |
| 358 |
tryagain: /* catch up with output? */ |
| 359 |
if (pmode == &polling) { |
| 360 |
if (nqr > nchild) /* don't get too far behind */ |
| 361 |
nqr -= output_catchup(nqr-nchild); |
| 362 |
} else if (nqr > 0) /* clear output before blocking */ |
| 363 |
nqr -= output_catchup(0); |
| 364 |
/* prepare select() call */ |
| 365 |
FD_ZERO(&readset); FD_ZERO(&errset); |
| 366 |
n = nr = 0; |
| 367 |
for (i = nchild; i--; ) { |
| 368 |
if (kida[i].nr) { |
| 369 |
FD_SET(kida[i].pr.r, &readset); |
| 370 |
++nr; |
| 371 |
} |
| 372 |
FD_SET(kida[i].pr.r, &errset); |
| 373 |
if (kida[i].pr.r >= n) |
| 374 |
n = kida[i].pr.r + 1; |
| 375 |
} |
| 376 |
if (!nr) /* nothing to wait for? */ |
| 377 |
return(-1); |
| 378 |
if ((nr > 1) | (pmode == &polling)) { |
| 379 |
errno = 0; |
| 380 |
nr = select(n, &readset, NULL, &errset, pmode); |
| 381 |
if (!nr) { |
| 382 |
pmode = NULL; /* try again, blocking this time */ |
| 383 |
goto tryagain; |
| 384 |
} |
| 385 |
if (nr < 0) |
| 386 |
error(SYSTEM, "select() error in next_child_nq()"); |
| 387 |
} else |
| 388 |
FD_ZERO(&errset); |
| 389 |
n = -1; /* read results from child(ren) */ |
| 390 |
for (i = nchild; i--; ) { |
| 391 |
if (FD_ISSET(kida[i].pr.r, &errset)) |
| 392 |
error(USER, "rendering process died"); |
| 393 |
if (FD_ISSET(kida[i].pr.r, &readset)) |
| 394 |
queue_results(n = i); |
| 395 |
} |
| 396 |
return(n); /* first available child */ |
| 397 |
} |
| 398 |
|
| 399 |
|
| 400 |
/* Run parental oversight loop */ |
| 401 |
void |
| 402 |
parental_loop() |
| 403 |
{ |
| 404 |
#define MAXIQ (int)(PIPE_BUF/(sizeof(FVECT)*2)) |
| 405 |
static int ignore_warning_given = 0; |
| 406 |
int qlimit = (accumulate == 1) ? 1 : MAXIQ-1; |
| 407 |
int ninq = 0; |
| 408 |
FVECT orgdir[2*MAXIQ]; |
| 409 |
int i, n; |
| 410 |
/* load rays from stdin & process */ |
| 411 |
#ifdef getc_unlocked |
| 412 |
flockfile(stdin); /* avoid lock/unlock overhead */ |
| 413 |
#endif |
| 414 |
while (getvec(orgdir[2*ninq]) == 0 && getvec(orgdir[2*ninq+1]) == 0) { |
| 415 |
if (orgdir[2*ninq+1][0] == 0.0 && /* asking for flush? */ |
| 416 |
(orgdir[2*ninq+1][1] == 0.0) & |
| 417 |
(orgdir[2*ninq+1][2] == 0.0)) { |
| 418 |
if (accumulate != 1) { |
| 419 |
if (!ignore_warning_given++) |
| 420 |
error(WARNING, |
| 421 |
"dummy ray(s) ignored during accumulation\n"); |
| 422 |
continue; |
| 423 |
} |
| 424 |
while (next_child_nq(1) >= 0) |
| 425 |
; /* clear the queue */ |
| 426 |
lastdone = lastray = 0; |
| 427 |
if ((yres <= 0) | (xres <= 0)) |
| 428 |
waitflush = 1; /* flush next */ |
| 429 |
put_zero_record(++lastray); |
| 430 |
} else if (++ninq >= qlimit || accumulate > 1 && |
| 431 |
lastray/accumulate != (lastray+ninq)/accumulate) { |
| 432 |
i = next_child_nq(0); /* manages output */ |
| 433 |
n = ninq; |
| 434 |
if (accumulate != 1) /* request flush? */ |
| 435 |
memset(orgdir[2*n++], 0, sizeof(FVECT)*2); |
| 436 |
n *= sizeof(FVECT)*2; /* send assignment */ |
| 437 |
if (writebuf(kida[i].pr.w, (char *)orgdir, n) != n) |
| 438 |
error(SYSTEM, "pipe write error"); |
| 439 |
kida[i].r1 = lastray+1; |
| 440 |
lastray += kida[i].nr = ninq; /* mark as busy */ |
| 441 |
ninq = 0; |
| 442 |
if (lastray < lastdone) { /* RNUMBER wrapped? */ |
| 443 |
while (next_child_nq(1) >= 0) |
| 444 |
; |
| 445 |
lastdone = lastray = 0; |
| 446 |
} |
| 447 |
} |
| 448 |
if (raysleft && !--raysleft) |
| 449 |
break; /* preemptive EOI */ |
| 450 |
} |
| 451 |
while (next_child_nq(1) >= 0) /* empty results queue */ |
| 452 |
; |
| 453 |
/* output accumulated record */ |
| 454 |
if (accumulate <= 0 || account < accumulate) { |
| 455 |
end_children(); /* frees up file descriptors */ |
| 456 |
if (account < accumulate) { |
| 457 |
error(WARNING, "partial accumulation in final record"); |
| 458 |
accumulate -= account; |
| 459 |
} |
| 460 |
for (i = 0; i < nmods; i++) |
| 461 |
mod_output(out_bq->mca[i]); |
| 462 |
end_record(); |
| 463 |
free_binq(out_bq); |
| 464 |
out_bq = NULL; |
| 465 |
} |
| 466 |
if (raysleft) |
| 467 |
error(USER, "unexpected EOF on input"); |
| 468 |
free_binq(NULL); /* clean up */ |
| 469 |
lu_done(&ofiletab); |
| 470 |
#undef MAXIQ |
| 471 |
} |
