| 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 | 
| 162 |  |  | 
| 163 |  | int             ray_pnprocs = 0;        /* number of child processes */ | 
| 164 |  | int             ray_pnidle = 0;         /* number of idle children */ | 
| 165 | + | int             ray_pnbatch = 0;        /* throughput over responsiveness? */ | 
| 166 |  |  | 
| 167 |  | static struct child_proc { | 
| 168 | < | int     pid;                            /* child process id */ | 
| 168 | > | RT_PID  pid;                            /* child process id */ | 
| 169 |  | int     fd_send;                        /* write to child here */ | 
| 170 |  | int     fd_recv;                        /* read from child here */ | 
| 171 |  | int     npending;                       /* # rays in process */ | 
| 177 |  | static int      r_recv_first = RAYQLEN; /* position of first unreported ray */ | 
| 178 |  | static int      r_recv_next = RAYQLEN;  /* next received ray placement */ | 
| 179 |  |  | 
| 180 | + | static int      samplestep = 1;         /* sample step size */ | 
| 181 | + |  | 
| 182 |  | #define sendq_full()    (r_send_next >= RAYQLEN) | 
| 183 |  |  | 
| 184 |  | static int ray_pflush(void); | 
| 213 |  | for (i = ray_pnprocs; nc && i--; ) { | 
| 214 |  | if (r_proc[i].npending > 0) | 
| 215 |  | continue;       /* child looks busy */ | 
| 216 | < | n = (r_send_next - sfirst)/nc--; | 
| 216 | > | n = r_send_next - sfirst; | 
| 217 | > | if (ray_pnbatch) | 
| 218 | > | nc--;           /* maximize bundling for batch calc */ | 
| 219 | > | else | 
| 220 | > | n /= nc--;      /* distribute work for interactivity */ | 
| 221 |  | if (!n) | 
| 222 |  | continue; | 
| 223 |  | /* smuggle set size in crtype */ | 
| 233 |  | ray_pnidle--;           /* now she's busy */ | 
| 234 |  | } | 
| 235 |  | if (sfirst != r_send_next) | 
| 236 | < | error(CONSISTENCY, "code screwup in ray_pflush"); | 
| 236 | > | error(CONSISTENCY, "code screwup in ray_pflush()"); | 
| 237 |  | r_send_next = 0; | 
| 238 |  | return(sfirst);                 /* return total # sent */ | 
| 239 |  | } | 
| 240 |  |  | 
| 241 |  |  | 
| 242 | < | void | 
| 242 | > | int | 
| 243 |  | ray_psend(                      /* add a ray to our send queue */ | 
| 244 |  | RAY     *r | 
| 245 |  | ) | 
| 246 |  | { | 
| 247 | < | if (r == NULL) | 
| 248 | < | return; | 
| 247 | > | int     rv; | 
| 248 | > |  | 
| 249 | > | if ((r == NULL) | (ray_pnidle <= 0)) | 
| 250 | > | return(0); | 
| 251 |  | /* flush output if necessary */ | 
| 252 | < | if (sendq_full() && ray_pflush() <= 0) | 
| 253 | < | error(INTERNAL, "ray_pflush failed in ray_psend"); | 
| 252 | > | if (sendq_full() && (rv = ray_pflush()) <= 0) | 
| 253 | > | return(rv); | 
| 254 |  |  | 
| 255 |  | r_queue[r_send_next++] = *r; | 
| 256 | + | return(1); | 
| 257 |  | } | 
| 258 |  |  | 
| 259 |  |  | 
| 272 |  | return(-1); | 
| 273 |  | /* put new ray in queue */ | 
| 274 |  | r_queue[r_send_next++] = mySend; | 
| 275 | < | /* XXX r_send_next may now be > RAYQLEN */ | 
| 275 | > |  | 
| 276 |  | return(1); | 
| 277 |  | } | 
| 278 |  | /* else add ray to send queue */ | 
| 295 |  | static struct timeval   tpoll;  /* zero timeval struct */ | 
| 296 |  | static fd_set   readset, errset; | 
| 297 |  | int     n, ok; | 
| 298 | < | register int    pn; | 
| 298 | > | int     pn; | 
| 299 |  |  | 
| 300 |  | if (r == NULL) | 
| 301 |  | return(0); | 
| 341 |  | poll ? &tpoll : (struct timeval *)NULL)) < 0) | 
| 342 |  | if (errno != EINTR) { | 
| 343 |  | error(WARNING, | 
| 344 | < | "select call failed in ray_presult"); | 
| 344 | > | "select call failed in ray_presult()"); | 
| 345 |  | ray_pclose(0); | 
| 346 |  | return(-1); | 
| 347 |  | } | 
| 373 |  | } | 
| 374 |  | /* preen returned rays */ | 
| 375 |  | for (n = r_recv_next - r_recv_first; n--; ) { | 
| 376 | < | register RAY    *rp = &r_queue[r_recv_first + n]; | 
| 376 | > | RAY     *rp = &r_queue[r_recv_first + n]; | 
| 377 |  | rp->rno = r_proc[pn].rno[n]; | 
| 378 |  | rp->parent = NULL; | 
| 379 |  | rp->newcset = rp->clipset = NULL; | 
| 409 |  | ) | 
| 410 |  | { | 
| 411 |  | int     n; | 
| 412 | < | register int    i; | 
| 412 | > | int     i; | 
| 413 |  | /* flag child process for quit() */ | 
| 414 |  | ray_pnprocs = -1; | 
| 415 |  | /* read each ray request set */ | 
| 420 |  | /* get smuggled set length */ | 
| 421 |  | n2 = sizeof(RAY)*r_queue[0].crtype - n; | 
| 422 |  | if (n2 < 0) | 
| 423 | < | error(INTERNAL, "buffer over-read in ray_pchild"); | 
| 423 | > | error(INTERNAL, "buffer over-read in ray_pchild()"); | 
| 424 |  | if (n2 > 0) {           /* read the rest of the set */ | 
| 425 |  | i = readbuf(fd_in, (char *)r_queue + n, n2); | 
| 426 |  | if (i != n2) | 
| 435 |  | r_queue[i].clipset = NULL; | 
| 436 |  | r_queue[i].slights = NULL; | 
| 437 |  | r_queue[i].rlvl = 0; | 
| 438 | < | samplendx++; | 
| 438 | > | samplendx += samplestep; | 
| 439 |  | rayclear(&r_queue[i]); | 
| 440 |  | rayvalue(&r_queue[i]); | 
| 441 |  | } | 
| 442 |  | /* write back our results */ | 
| 443 |  | i = writebuf(fd_out, (char *)r_queue, sizeof(RAY)*n); | 
| 444 |  | if (i != sizeof(RAY)*n) | 
| 445 | < | error(SYSTEM, "write error in ray_pchild"); | 
| 445 | > | error(SYSTEM, "write error in ray_pchild()"); | 
| 446 |  | } | 
| 447 |  | if (n) | 
| 448 | < | error(SYSTEM, "read error in ray_pchild"); | 
| 448 | > | error(SYSTEM, "read error in ray_pchild()"); | 
| 449 |  | ambsync(); | 
| 450 |  | quit(0);                        /* normal exit */ | 
| 451 |  | } | 
| 469 |  | strcpy(shm_boundary, "SHM_BOUNDARY"); | 
| 470 |  | } | 
| 471 |  | fflush(NULL);                   /* clear pending output */ | 
| 472 | + | samplestep = ray_pnprocs + nadd; | 
| 473 |  | while (nadd--) {                /* fork each new process */ | 
| 474 |  | int     p0[2], p1[2]; | 
| 475 |  | if (pipe(p0) < 0 || pipe(p1) < 0) | 
| 481 |  | close(r_proc[pn].fd_recv); | 
| 482 |  | } | 
| 483 |  | close(p0[0]); close(p1[1]); | 
| 484 | + | close(0);       /* don't share stdin */ | 
| 485 |  | /* following call never returns */ | 
| 486 |  | ray_pchild(p1[0], p0[1]); | 
| 487 |  | } | 
| 488 |  | if (r_proc[ray_pnprocs].pid < 0) | 
| 489 |  | error(SYSTEM, "cannot fork child process"); | 
| 490 |  | close(p1[0]); close(p0[1]); | 
| 491 | + | if (rand_samp)          /* decorrelate random sequence */ | 
| 492 | + | srandom(random()); | 
| 493 | + | else | 
| 494 | + | samplendx++; | 
| 495 |  | /* | 
| 496 |  | * Close write stream on exec to avoid multiprocessing deadlock. | 
| 497 |  | * No use in read stream without it, so set flag there as well. | 
| 513 |  | ) | 
| 514 |  | { | 
| 515 |  | static int      inclose = 0; | 
| 516 | < | RAY     res; | 
| 516 | > | RAY             res; | 
| 517 | > | int             i, status = 0; | 
| 518 |  | /* check recursion */ | 
| 519 |  | if (inclose) | 
| 520 |  | return; | 
| 521 |  | inclose++; | 
| 522 | + | /* check no child / in child */ | 
| 523 | + | if (ray_pnprocs <= 0) | 
| 524 | + | return; | 
| 525 |  | /* check argument */ | 
| 526 |  | if ((nsub <= 0) | (nsub > ray_pnprocs)) | 
| 527 |  | nsub = ray_pnprocs; | 
| 530 |  | ; | 
| 531 |  | r_send_next = 0;                /* hard reset in case of error */ | 
| 532 |  | r_recv_first = r_recv_next = RAYQLEN; | 
| 533 | < | /* clean up children */ | 
| 534 | < | while (nsub--) { | 
| 535 | < | int     status; | 
| 536 | < | ray_pnprocs--; | 
| 537 | < | close(r_proc[ray_pnprocs].fd_recv); | 
| 538 | < | close(r_proc[ray_pnprocs].fd_send); | 
| 517 | < | if (waitpid(r_proc[ray_pnprocs].pid, &status, 0) < 0) | 
| 533 | > | /* close send pipes */ | 
| 534 | > | for (i = ray_pnprocs-nsub; i < ray_pnprocs; i++) | 
| 535 | > | close(r_proc[i].fd_send); | 
| 536 | > |  | 
| 537 | > | if (nsub == 1) {                /* awaiting single process? */ | 
| 538 | > | if (waitpid(r_proc[ray_pnprocs-1].pid, &status, 0) < 0) | 
| 539 |  | status = 127<<8; | 
| 540 | < | if (status) { | 
| 541 | < | sprintf(errmsg, | 
| 542 | < | "rendering process %d exited with code %d", | 
| 543 | < | r_proc[ray_pnprocs].pid, status>>8); | 
| 544 | < | error(WARNING, errmsg); | 
| 540 | > | close(r_proc[ray_pnprocs-1].fd_recv); | 
| 541 | > | } else                          /* else unordered wait */ | 
| 542 | > | for (i = 0; i < nsub; ) { | 
| 543 | > | int     j, mystatus; | 
| 544 | > | RT_PID  pid = wait(&mystatus); | 
| 545 | > | for (j = ray_pnprocs-nsub; j < ray_pnprocs; j++) | 
| 546 | > | if (r_proc[j].pid == pid) { | 
| 547 | > | if (mystatus) | 
| 548 | > | status = mystatus; | 
| 549 | > | close(r_proc[j].fd_recv); | 
| 550 | > | ++i; | 
| 551 | > | } | 
| 552 |  | } | 
| 553 | < | ray_pnidle--; | 
| 553 | > | ray_pnprocs -= nsub; | 
| 554 | > | ray_pnidle -= nsub; | 
| 555 | > | if (status) { | 
| 556 | > | sprintf(errmsg, "rendering process exited with code %d", status>>8); | 
| 557 | > | error(WARNING, errmsg); | 
| 558 |  | } | 
| 559 |  | inclose--; | 
| 560 |  | } |