71 |
|
* |
72 |
|
* If the second argument is 1, the call won't block when |
73 |
|
* results aren't ready, but will immediately return 0. |
74 |
– |
* (A special value of -1 returns 0 unless a ray is |
75 |
– |
* ready in the queue and no system calls are needed.) |
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_pclose(0) is automatically called to close |
81 |
|
* all child processes, and ray_pnprocs is set to zero. |
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. |
147 |
|
#include "selcall.h" |
148 |
|
|
149 |
|
#ifndef RAYQLEN |
150 |
< |
#define RAYQLEN 12 /* # rays to send at once */ |
150 |
> |
#define RAYQLEN 24 /* # rays to send at once */ |
151 |
|
#endif |
152 |
|
|
153 |
|
#ifndef MAX_RPROCS |
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 */ |
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); |
212 |
|
for (i = ray_pnprocs; nc && i--; ) { |
213 |
|
if (r_proc[i].npending > 0) |
214 |
|
continue; /* child looks busy */ |
215 |
< |
n = (r_send_next - sfirst)/nc--; |
215 |
> |
n = (r_send_next - sfirst) / nc--; |
216 |
|
if (!n) |
217 |
|
continue; |
218 |
|
/* smuggle set size in crtype */ |
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 |
< |
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 |
|
|
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 */ |
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); |
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; |
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) |
430 |
|
r_queue[i].clipset = NULL; |
431 |
|
r_queue[i].slights = NULL; |
432 |
|
r_queue[i].rlvl = 0; |
433 |
< |
samplendx++; |
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 |
|
} |
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. |
508 |
|
) |
509 |
|
{ |
510 |
|
static int inclose = 0; |
511 |
< |
RAY res; |
511 |
> |
RAY res; |
512 |
> |
int i, status = 0; |
513 |
> |
/* check no child / in child */ |
514 |
> |
if (ray_pnprocs <= 0) |
515 |
> |
return; |
516 |
|
/* check recursion */ |
517 |
|
if (inclose) |
518 |
|
return; |
525 |
|
; |
526 |
|
r_send_next = 0; /* hard reset in case of error */ |
527 |
|
r_recv_first = r_recv_next = RAYQLEN; |
528 |
< |
/* clean up children */ |
529 |
< |
while (nsub--) { |
530 |
< |
int status; |
531 |
< |
ray_pnprocs--; |
532 |
< |
close(r_proc[ray_pnprocs].fd_recv); |
533 |
< |
close(r_proc[ray_pnprocs].fd_send); |
517 |
< |
if (waitpid(r_proc[ray_pnprocs].pid, &status, 0) < 0) |
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--; |
555 |
|
} |