| 13 |
|
* These calls are designed similarly to the ones in raycalls.c, |
| 14 |
|
* but allow for multiple rendering processes on the same host |
| 15 |
|
* machine. There is no sense in specifying more child processes |
| 16 |
< |
* than you have processors, but one child may help by allowing |
| 16 |
> |
* than you have processor cores, but one child may help by allowing |
| 17 |
|
* asynchronous ray computation in an interactive program, and |
| 18 |
|
* will protect the caller from fatal rendering errors. |
| 19 |
|
* |
| 20 |
< |
* You should first read and undrstand the header in raycalls.c, |
| 20 |
> |
* You should first read and understand the header in raycalls.c, |
| 21 |
|
* as some things are explained there that are not repated here. |
| 22 |
|
* |
| 23 |
|
* The first step is opening one or more rendering processes |
| 25 |
|
* ray_pinit() loads the octree and data structures into the |
| 26 |
|
* caller's memory, and ray_popen() synchronizes the ambient |
| 27 |
|
* file, if any. Shared memory permits all sorts of queries |
| 28 |
< |
* that wouldn't be possible otherwise, without causing any real |
| 28 |
> |
* that wouldn't be possible otherwise without causing any real |
| 29 |
|
* memory overhead, since all the static data are shared |
| 30 |
< |
* between processes. Rays are then traced using a simple |
| 30 |
> |
* between processes. Rays are traced using a simple |
| 31 |
|
* queuing mechanism, explained below. |
| 32 |
|
* |
| 33 |
|
* The ray queue buffers RAYQLEN rays before sending to |
| 34 |
< |
* children, each of which may internally buffer RAYQLEN rays. |
| 34 |
> |
* children, each of which may internally buffer RAYQLEN rays |
| 35 |
> |
* during evaluation. Rays are not returned in the order |
| 36 |
> |
* they are sent when multiple processes are open. |
| 37 |
|
* |
| 38 |
|
* Rays are queued and returned by a single |
| 39 |
|
* ray_pqueue() call. A ray_pqueue() return |
| 73 |
|
* results aren't ready, but will immediately return 0. |
| 74 |
|
* If the second argument is 0, the call will block |
| 75 |
|
* until a value is available, returning 0 only if the |
| 76 |
< |
* queue is completely empty. A negative return value |
| 76 |
> |
* queue is completely empty. Setting the second argument |
| 77 |
> |
* to -1 returns 0 unless a ray is ready in the queue and |
| 78 |
> |
* no system calls are needed. A negative return value |
| 79 |
|
* indicates that a rendering process died. If this |
| 80 |
< |
* happens, ray_close(0) is automatically called to close |
| 80 |
> |
* happens, ray_pclose(0) is automatically called to close |
| 81 |
|
* all child processes, and ray_pnprocs is set to zero. |
| 82 |
|
* |
| 83 |
|
* If you just want to fill the ray queue without checking for |
| 88 |
|
* ray_psend(&myRay); |
| 89 |
|
* } |
| 90 |
|
* |
| 91 |
< |
* Note that it is a fatal error to call ra_psend() when |
| 92 |
< |
* ray_pnidle is zero. The ray_presult() and/or ray_pqueue() |
| 93 |
< |
* functions may be called subsequently to read back the results. |
| 91 |
> |
* Note that it is a mistake to call ra_psend() when |
| 92 |
> |
* ray_pnidle is zero, and nothing will be sent in |
| 93 |
> |
* this case. Otherwise, the ray_presult() and/or ray_pqueue() |
| 94 |
> |
* functions may be called subsequently to read back the results |
| 95 |
> |
* of rays queued by ray_psend(). |
| 96 |
|
* |
| 97 |
|
* When you are done, you may call ray_pdone(1) to close |
| 98 |
|
* all child processes and clean up memory used by Radiance. |
| 99 |
|
* Any queued ray calculations will be awaited and discarded. |
| 100 |
|
* As with ray_done(), ray_pdone(0) hangs onto data files |
| 101 |
|
* and fonts that are likely to be used in subsequent renderings. |
| 102 |
< |
* Whether you want to bother cleaning up memory or not, you |
| 103 |
< |
* should at least call ray_pclose(0) to clean the child processes. |
| 102 |
> |
* Whether you need to clean up memory or not, you should |
| 103 |
> |
* at least call ray_pclose(0) to await the child processes. |
| 104 |
> |
* The caller should define a quit() function that calls |
| 105 |
> |
* ray_pclose(0) if ray_pnprocs > 0. |
| 106 |
|
* |
| 107 |
|
* Warning: You cannot affect any of the rendering processes |
| 108 |
|
* by changing global parameter values onece ray_pinit() has |
| 132 |
|
* returning a negative value from ray_pqueue() or |
| 133 |
|
* ray_presult(). If you get a negative value from either |
| 134 |
|
* of these calls, you can assume that the processes have |
| 135 |
< |
* been cleaned up with a call to ray_close(), though you |
| 135 |
> |
* been cleaned up with a call to ray_pclose(), though you |
| 136 |
|
* will have to call ray_pdone() yourself if you want to |
| 137 |
|
* free memory. Obviously, you cannot continue rendering |
| 138 |
|
* without risking further errors, but otherwise your |
| 164 |
|
int ray_pnidle = 0; /* number of idle children */ |
| 165 |
|
|
| 166 |
|
static struct child_proc { |
| 167 |
< |
int pid; /* child process id */ |
| 167 |
> |
RT_PID pid; /* child process id */ |
| 168 |
|
int fd_send; /* write to child here */ |
| 169 |
|
int fd_recv; /* read from child here */ |
| 170 |
|
int npending; /* # rays in process */ |
| 171 |
< |
unsigned long rno[RAYQLEN]; /* working on these rays */ |
| 171 |
> |
RNUMBER rno[RAYQLEN]; /* working on these rays */ |
| 172 |
|
} r_proc[MAX_NPROCS]; /* our child processes */ |
| 173 |
|
|
| 174 |
|
static RAY r_queue[2*RAYQLEN]; /* ray i/o buffer */ |
| 175 |
< |
static int r_send_next; /* next send ray placement */ |
| 176 |
< |
static int r_recv_first; /* position of first unreported ray */ |
| 177 |
< |
static int r_recv_next; /* next receive ray placement */ |
| 175 |
> |
static int r_send_next = 0; /* next send ray placement */ |
| 176 |
> |
static int r_recv_first = RAYQLEN; /* position of first unreported ray */ |
| 177 |
> |
static int r_recv_next = RAYQLEN; /* next received ray placement */ |
| 178 |
|
|
| 179 |
+ |
static int samplestep = 1; /* sample step size */ |
| 180 |
+ |
|
| 181 |
|
#define sendq_full() (r_send_next >= RAYQLEN) |
| 182 |
|
|
| 183 |
|
static int ray_pflush(void); |
| 184 |
|
static void ray_pchild(int fd_in, int fd_out); |
| 185 |
|
|
| 186 |
|
|
| 187 |
< |
extern void |
| 187 |
> |
void |
| 188 |
|
ray_pinit( /* initialize ray-tracing processes */ |
| 189 |
|
char *otnm, |
| 190 |
|
int nproc |
| 195 |
|
|
| 196 |
|
ray_init(otnm); /* load the shared scene */ |
| 197 |
|
|
| 188 |
– |
preload_objs(); /* preload auxiliary data */ |
| 189 |
– |
|
| 190 |
– |
/* set shared memory boundary */ |
| 191 |
– |
shm_boundary = (char *)malloc(16); |
| 192 |
– |
strcpy(shm_boundary, "SHM_BOUNDARY"); |
| 193 |
– |
|
| 194 |
– |
r_send_next = 0; /* set up queue */ |
| 195 |
– |
r_recv_first = r_recv_next = RAYQLEN; |
| 196 |
– |
|
| 198 |
|
ray_popen(nproc); /* fork children */ |
| 199 |
|
} |
| 200 |
|
|
| 228 |
|
ray_pnidle--; /* now she's busy */ |
| 229 |
|
} |
| 230 |
|
if (sfirst != r_send_next) |
| 231 |
< |
error(CONSISTENCY, "code screwup in ray_pflush"); |
| 231 |
> |
error(CONSISTENCY, "code screwup in ray_pflush()"); |
| 232 |
|
r_send_next = 0; |
| 233 |
|
return(sfirst); /* return total # sent */ |
| 234 |
|
} |
| 235 |
|
|
| 236 |
|
|
| 237 |
< |
extern void |
| 237 |
> |
int |
| 238 |
|
ray_psend( /* add a ray to our send queue */ |
| 239 |
|
RAY *r |
| 240 |
|
) |
| 241 |
|
{ |
| 242 |
< |
if (r == NULL) |
| 243 |
< |
return; |
| 242 |
> |
int rv; |
| 243 |
> |
|
| 244 |
> |
if ((r == NULL) | (ray_pnidle <= 0)) |
| 245 |
> |
return(0); |
| 246 |
|
/* flush output if necessary */ |
| 247 |
< |
if (sendq_full() && ray_pflush() <= 0) |
| 248 |
< |
error(INTERNAL, "ray_pflush failed in ray_psend"); |
| 247 |
> |
if (sendq_full() && (rv = ray_pflush()) <= 0) |
| 248 |
> |
return(rv); |
| 249 |
|
|
| 250 |
|
r_queue[r_send_next++] = *r; |
| 251 |
+ |
return(1); |
| 252 |
|
} |
| 253 |
|
|
| 254 |
|
|
| 255 |
< |
extern int |
| 255 |
> |
int |
| 256 |
|
ray_pqueue( /* queue a ray for computation */ |
| 257 |
|
RAY *r |
| 258 |
|
) |
| 267 |
|
return(-1); |
| 268 |
|
/* put new ray in queue */ |
| 269 |
|
r_queue[r_send_next++] = mySend; |
| 270 |
< |
/* XXX r_send_next may now be > RAYQLEN */ |
| 270 |
> |
|
| 271 |
|
return(1); |
| 272 |
|
} |
| 273 |
|
/* else add ray to send queue */ |
| 281 |
|
} |
| 282 |
|
|
| 283 |
|
|
| 284 |
< |
extern int |
| 284 |
> |
int |
| 285 |
|
ray_presult( /* check for a completed ray */ |
| 286 |
|
RAY *r, |
| 287 |
|
int poll |
| 290 |
|
static struct timeval tpoll; /* zero timeval struct */ |
| 291 |
|
static fd_set readset, errset; |
| 292 |
|
int n, ok; |
| 293 |
< |
register int pn; |
| 293 |
> |
int pn; |
| 294 |
|
|
| 295 |
|
if (r == NULL) |
| 296 |
|
return(0); |
| 299 |
|
*r = r_queue[r_recv_first++]; |
| 300 |
|
return(1); |
| 301 |
|
} |
| 302 |
+ |
if (poll < 0) /* immediate polling mode? */ |
| 303 |
+ |
return(0); |
| 304 |
+ |
|
| 305 |
|
n = ray_pnprocs - ray_pnidle; /* pending before flush? */ |
| 306 |
|
|
| 307 |
|
if (ray_pflush() < 0) /* send new rays to process */ |
| 321 |
|
if (FD_ISSET(r_proc[pn].fd_recv, &readset) || |
| 322 |
|
FD_ISSET(r_proc[pn].fd_recv, &errset)) |
| 323 |
|
break; |
| 324 |
< |
/* call select if we must */ |
| 324 |
> |
/* call select() if we must */ |
| 325 |
|
if (pn < 0) { |
| 326 |
|
FD_ZERO(&readset); FD_ZERO(&errset); n = 0; |
| 327 |
|
for (pn = ray_pnprocs; pn--; ) { |
| 336 |
|
poll ? &tpoll : (struct timeval *)NULL)) < 0) |
| 337 |
|
if (errno != EINTR) { |
| 338 |
|
error(WARNING, |
| 339 |
< |
"select call failed in ray_presult"); |
| 339 |
> |
"select call failed in ray_presult()"); |
| 340 |
|
ray_pclose(0); |
| 341 |
|
return(-1); |
| 342 |
|
} |
| 368 |
|
} |
| 369 |
|
/* preen returned rays */ |
| 370 |
|
for (n = r_recv_next - r_recv_first; n--; ) { |
| 371 |
< |
register RAY *rp = &r_queue[r_recv_first + n]; |
| 371 |
> |
RAY *rp = &r_queue[r_recv_first + n]; |
| 372 |
|
rp->rno = r_proc[pn].rno[n]; |
| 373 |
|
rp->parent = NULL; |
| 374 |
|
rp->newcset = rp->clipset = NULL; |
| 381 |
|
} |
| 382 |
|
|
| 383 |
|
|
| 384 |
< |
extern void |
| 384 |
> |
void |
| 385 |
|
ray_pdone( /* reap children and free data */ |
| 386 |
|
int freall |
| 387 |
|
) |
| 392 |
|
free((void *)shm_boundary); |
| 393 |
|
shm_boundary = NULL; |
| 394 |
|
} |
| 395 |
+ |
|
| 396 |
|
ray_done(freall); /* free rendering data */ |
| 397 |
|
} |
| 398 |
|
|
| 404 |
|
) |
| 405 |
|
{ |
| 406 |
|
int n; |
| 407 |
< |
register int i; |
| 407 |
> |
int i; |
| 408 |
|
/* flag child process for quit() */ |
| 409 |
|
ray_pnprocs = -1; |
| 410 |
|
/* read each ray request set */ |
| 415 |
|
/* get smuggled set length */ |
| 416 |
|
n2 = sizeof(RAY)*r_queue[0].crtype - n; |
| 417 |
|
if (n2 < 0) |
| 418 |
< |
error(INTERNAL, "buffer over-read in ray_pchild"); |
| 418 |
> |
error(INTERNAL, "buffer over-read in ray_pchild()"); |
| 419 |
|
if (n2 > 0) { /* read the rest of the set */ |
| 420 |
|
i = readbuf(fd_in, (char *)r_queue + n, n2); |
| 421 |
|
if (i != n2) |
| 429 |
|
r_queue[i].parent = NULL; |
| 430 |
|
r_queue[i].clipset = NULL; |
| 431 |
|
r_queue[i].slights = NULL; |
| 432 |
< |
samplendx++; |
| 432 |
> |
r_queue[i].rlvl = 0; |
| 433 |
> |
samplendx += samplestep; |
| 434 |
|
rayclear(&r_queue[i]); |
| 435 |
|
rayvalue(&r_queue[i]); |
| 436 |
|
} |
| 437 |
|
/* write back our results */ |
| 438 |
|
i = writebuf(fd_out, (char *)r_queue, sizeof(RAY)*n); |
| 439 |
|
if (i != sizeof(RAY)*n) |
| 440 |
< |
error(SYSTEM, "write error in ray_pchild"); |
| 440 |
> |
error(SYSTEM, "write error in ray_pchild()"); |
| 441 |
|
} |
| 442 |
|
if (n) |
| 443 |
< |
error(SYSTEM, "read error in ray_pchild"); |
| 443 |
> |
error(SYSTEM, "read error in ray_pchild()"); |
| 444 |
|
ambsync(); |
| 445 |
|
quit(0); /* normal exit */ |
| 446 |
|
} |
| 447 |
|
|
| 448 |
|
|
| 449 |
< |
extern void |
| 449 |
> |
void |
| 450 |
|
ray_popen( /* open the specified # processes */ |
| 451 |
|
int nadd |
| 452 |
|
) |
| 457 |
|
if (nadd <= 0) |
| 458 |
|
return; |
| 459 |
|
ambsync(); /* load any new ambient values */ |
| 460 |
+ |
if (shm_boundary == NULL) { /* first child process? */ |
| 461 |
+ |
preload_objs(); /* preload auxiliary data */ |
| 462 |
+ |
/* set shared memory boundary */ |
| 463 |
+ |
shm_boundary = (char *)malloc(16); |
| 464 |
+ |
strcpy(shm_boundary, "SHM_BOUNDARY"); |
| 465 |
+ |
} |
| 466 |
|
fflush(NULL); /* clear pending output */ |
| 467 |
+ |
samplestep = ray_pnprocs + nadd; |
| 468 |
|
while (nadd--) { /* fork each new process */ |
| 469 |
|
int p0[2], p1[2]; |
| 470 |
|
if (pipe(p0) < 0 || pipe(p1) < 0) |
| 476 |
|
close(r_proc[pn].fd_recv); |
| 477 |
|
} |
| 478 |
|
close(p0[0]); close(p1[1]); |
| 479 |
+ |
close(0); /* don't share stdin */ |
| 480 |
|
/* following call never returns */ |
| 481 |
|
ray_pchild(p1[0], p0[1]); |
| 482 |
|
} |
| 483 |
|
if (r_proc[ray_pnprocs].pid < 0) |
| 484 |
|
error(SYSTEM, "cannot fork child process"); |
| 485 |
|
close(p1[0]); close(p0[1]); |
| 486 |
+ |
if (rand_samp) /* decorrelate random sequence */ |
| 487 |
+ |
srandom(random()); |
| 488 |
+ |
else |
| 489 |
+ |
samplendx++; |
| 490 |
|
/* |
| 491 |
|
* Close write stream on exec to avoid multiprocessing deadlock. |
| 492 |
|
* No use in read stream without it, so set flag there as well. |
| 502 |
|
} |
| 503 |
|
|
| 504 |
|
|
| 505 |
< |
extern void |
| 505 |
> |
void |
| 506 |
|
ray_pclose( /* close one or more child processes */ |
| 507 |
|
int nsub |
| 508 |
|
) |
| 509 |
|
{ |
| 510 |
|
static int inclose = 0; |
| 511 |
< |
RAY res; |
| 511 |
> |
RAY res; |
| 512 |
> |
int i, status = 0; |
| 513 |
|
/* check recursion */ |
| 514 |
|
if (inclose) |
| 515 |
|
return; |
| 516 |
|
inclose++; |
| 517 |
+ |
/* check no child / in child */ |
| 518 |
+ |
if (ray_pnprocs <= 0) |
| 519 |
+ |
return; |
| 520 |
|
/* check argument */ |
| 521 |
|
if ((nsub <= 0) | (nsub > ray_pnprocs)) |
| 522 |
|
nsub = ray_pnprocs; |
| 523 |
|
/* clear our ray queue */ |
| 524 |
|
while (ray_presult(&res,0) > 0) |
| 525 |
|
; |
| 526 |
< |
/* clean up children */ |
| 527 |
< |
while (nsub--) { |
| 528 |
< |
int status; |
| 529 |
< |
ray_pnprocs--; |
| 530 |
< |
close(r_proc[ray_pnprocs].fd_recv); |
| 531 |
< |
close(r_proc[ray_pnprocs].fd_send); |
| 532 |
< |
if (waitpid(r_proc[ray_pnprocs].pid, &status, 0) < 0) |
| 526 |
> |
r_send_next = 0; /* hard reset in case of error */ |
| 527 |
> |
r_recv_first = r_recv_next = RAYQLEN; |
| 528 |
> |
/* close send pipes */ |
| 529 |
> |
for (i = ray_pnprocs-nsub; i < ray_pnprocs; i++) |
| 530 |
> |
close(r_proc[i].fd_send); |
| 531 |
> |
|
| 532 |
> |
if (nsub == 1) { /* awaiting single process? */ |
| 533 |
> |
if (waitpid(r_proc[ray_pnprocs-1].pid, &status, 0) < 0) |
| 534 |
|
status = 127<<8; |
| 535 |
< |
if (status) { |
| 536 |
< |
sprintf(errmsg, |
| 537 |
< |
"rendering process %d exited with code %d", |
| 538 |
< |
r_proc[ray_pnprocs].pid, status>>8); |
| 539 |
< |
error(WARNING, errmsg); |
| 535 |
> |
close(r_proc[ray_pnprocs-1].fd_recv); |
| 536 |
> |
} else /* else unordered wait */ |
| 537 |
> |
for (i = 0; i < nsub; ) { |
| 538 |
> |
int j, mystatus; |
| 539 |
> |
RT_PID pid = wait(&mystatus); |
| 540 |
> |
for (j = ray_pnprocs-nsub; j < ray_pnprocs; j++) |
| 541 |
> |
if (r_proc[j].pid == pid) { |
| 542 |
> |
if (mystatus) |
| 543 |
> |
status = mystatus; |
| 544 |
> |
close(r_proc[j].fd_recv); |
| 545 |
> |
++i; |
| 546 |
> |
} |
| 547 |
|
} |
| 548 |
< |
ray_pnidle--; |
| 548 |
> |
ray_pnprocs -= nsub; |
| 549 |
> |
ray_pnidle -= nsub; |
| 550 |
> |
if (status) { |
| 551 |
> |
sprintf(errmsg, "rendering process exited with code %d", status>>8); |
| 552 |
> |
error(WARNING, errmsg); |
| 553 |
|
} |
| 554 |
|
inclose--; |
| 518 |
– |
} |
| 519 |
– |
|
| 520 |
– |
|
| 521 |
– |
void |
| 522 |
– |
quit(ec) /* make sure exit is called */ |
| 523 |
– |
int ec; |
| 524 |
– |
{ |
| 525 |
– |
if (ray_pnprocs > 0) /* close children if any */ |
| 526 |
– |
ray_pclose(0); |
| 527 |
– |
exit(ec); |
| 555 |
|
} |
