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root/radiance/src/rt/raypcalls.c
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Comparing src/rt/raypcalls.c (file contents):
Revision 2.7 by greg, Fri Sep 17 14:27:33 2004 UTC vs.
Revision 2.17 by greg, Tue Sep 18 19:10:02 2007 UTC

# Line 23 | Line 23 | static const char      RCSid[] = "$Id$";
23   *  The first step is opening one or more rendering processes
24   *  with a call to ray_pinit(oct, nproc).  Before calling fork(),
25   *  ray_pinit() loads the octree and data structures into the
26 < *  caller's memory.  This permits all sorts of queries that
27 < *  wouldn't be possible otherwise, without causing any real
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
29   *  memory overhead, since all the static data are shared
30   *  between processes.  Rays are then traced using a simple
31   *  queuing mechanism, explained below.
32   *
33 < *  The ray queue holds as many rays as there are rendering
34 < *  processes.  Rays are queued and returned by a single
33 > *  The ray queue buffers RAYQLEN rays before sending to
34 > *  children, each of which may internally buffer RAYQLEN rays.
35 > *
36 > *  Rays are queued and returned by a single
37   *  ray_pqueue() call.  A ray_pqueue() return
38   *  value of 0 indicates that no rays are ready
39   *  and the queue is not yet full.  A return value of 1
# Line 43 | Line 46 | static const char      RCSid[] = "$Id$";
46   *      myRay.rorg = ( ray origin point )
47   *      myRay.rdir = ( normalized ray direction )
48   *      myRay.rmax = ( maximum length, or zero for no limit )
49 < *      rayorigin(&myRay, NULL, PRIMARY, 1.0);
49 > *      rayorigin(&myRay, PRIMARY, NULL, NULL);
50   *      myRay.rno = ( my personal ray identifier )
51   *      if (ray_pqueue(&myRay) == 1)
52   *              { do something with results }
# Line 105 | Line 108 | static const char      RCSid[] = "$Id$";
108   *  Note:  These routines are written to coordinate with the
109   *  definitions in raycalls.c, and in fact depend on them.
110   *  If you want to trace a ray and get a result synchronously,
111 < *  use the ray_trace() call to compute it in the parent process
111 > *  use the ray_trace() call to compute it in the parent process.
112   *  This will not interfere with any subprocess calculations,
113   *  but beware that a fatal error may end with a call to quit().
114   *
# Line 138 | Line 141 | static const char      RCSid[] = "$Id$";
141   #include  "selcall.h"
142  
143   #ifndef RAYQLEN
144 < #define RAYQLEN         16              /* # rays to send at once */
144 > #define RAYQLEN         12              /* # rays to send at once */
145   #endif
146  
147   #ifndef MAX_RPROCS
# Line 170 | Line 173 | static int     r_recv_next;            /* next receive ray placement
173   #define sendq_full()    (r_send_next >= RAYQLEN)
174  
175   static int ray_pflush(void);
176 < static void ray_pchild(int      fd_in, int      fd_out);
176 > static void ray_pchild(int fd_in, int fd_out);
177  
178  
179   extern void
# Line 243 | Line 246 | ray_psend(                     /* add a ray to our send queue */
246          if (sendq_full() && ray_pflush() <= 0)
247                  error(INTERNAL, "ray_pflush failed in ray_psend");
248  
249 <        r_queue[r_send_next] = *r;
247 <        r_send_next++;
249 >        r_queue[r_send_next++] = *r;
250   }
251  
252  
# Line 263 | Line 265 | ray_pqueue(                    /* queue a ray for computation */
265                                          /* wait for a result */
266                  rval = ray_presult(r, 0);
267                                          /* put new ray in queue */
268 <                r_queue[r_send_next] = mySend;
267 <                r_send_next++;
268 >                r_queue[r_send_next++] = mySend;
269                  return(rval);           /* done */
270          }
271 <                                        /* add ray to send queue */
272 <        r_queue[r_send_next] = *r;
272 <        r_send_next++;
271 >                                        /* else add ray to send queue */
272 >        r_queue[r_send_next++] = *r;
273                                          /* check for returned ray... */
274          if (r_recv_first >= r_recv_next)
275                  return(0);
276                                          /* ...one is sitting in queue */
277 <        *r = r_queue[r_recv_first];
278 <        r_recv_first++;
277 >        *r = r_queue[r_recv_first++];
278          return(1);
279   }
280  
# Line 295 | Line 294 | ray_presult(           /* check for a completed ray */
294                  return(0);
295                                          /* check queued results first */
296          if (r_recv_first < r_recv_next) {
297 <                *r = r_queue[r_recv_first];
298 <                r_recv_first++;
297 >                *r = r_queue[r_recv_first++];
298 >                                        /* make sure send queue has room */
299 >                if (sendq_full() && ray_pflush() <= 0)
300 >                        return(-1);
301                  return(1);
302          }
303          n = ray_pnprocs - ray_pnidle;   /* pending before flush? */
# Line 310 | Line 311 | ray_presult(           /* check for a completed ray */
311                  n = ray_pnprocs - ray_pnidle;
312          if (n <= 0)                     /* return if nothing to await */
313                  return(0);
314 +        if (!poll && ray_pnprocs == 1)  /* one process -> skip select() */
315 +                FD_SET(r_proc[0].fd_recv, &readset);
316 +
317   getready:                               /* any children waiting for us? */
318          for (pn = ray_pnprocs; pn--; )
319                  if (FD_ISSET(r_proc[pn].fd_recv, &readset) ||
# Line 370 | Line 374 | getready:                              /* any children waiting for us? */
374                  rp->slights = NULL;
375          }
376                                          /* return first ray received */
377 <        *r = r_queue[r_recv_first];
374 <        r_recv_first++;
377 >        *r = r_queue[r_recv_first++];
378          return(1);
379   }
380  
# Line 399 | Line 402 | ray_pchild(    /* process rays (never returns) */
402   {
403          int     n;
404          register int    i;
405 +                                        /* flag child process for quit() */
406 +        ray_pnprocs = -1;
407                                          /* read each ray request set */
408          while ((n = read(fd_in, (char *)r_queue, sizeof(r_queue))) > 0) {
409                  int     n2;
410 <                if (n % sizeof(RAY))
410 >                if (n < sizeof(RAY))
411                          break;
407 –                n /= sizeof(RAY);
412                                          /* get smuggled set length */
413 <                n2 = r_queue[0].crtype - n;
413 >                n2 = sizeof(RAY)*r_queue[0].crtype - n;
414                  if (n2 < 0)
415                          error(INTERNAL, "buffer over-read in ray_pchild");
416                  if (n2 > 0) {           /* read the rest of the set */
417 <                        i = readbuf(fd_in, (char *)(r_queue+n),
418 <                                        sizeof(RAY)*n2);
415 <                        if (i != sizeof(RAY)*n2)
417 >                        i = readbuf(fd_in, (char *)r_queue + n, n2);
418 >                        if (i != n2)
419                                  break;
420                          n += n2;
421                  }
422 +                n /= sizeof(RAY);
423                                          /* evaluate rays */
424                  for (i = 0; i < n; i++) {
425                          r_queue[i].crtype = r_queue[i].rtype;
426                          r_queue[i].parent = NULL;
427                          r_queue[i].clipset = NULL;
428                          r_queue[i].slights = NULL;
425 –                        r_queue[i].revf = raytrace;
429                          samplendx++;
430                          rayclear(&r_queue[i]);
431                          rayvalue(&r_queue[i]);
# Line 449 | Line 452 | ray_popen(                     /* open the specified # processes */
452                  nadd = MAX_NPROCS - ray_pnprocs;
453          if (nadd <= 0)
454                  return;
455 <        fflush(stderr);                 /* clear pending output */
456 <        fflush(stdout);
455 >        ambsync();                      /* load any new ambient values */
456 >        fflush(NULL);                   /* clear pending output */
457          while (nadd--) {                /* fork each new process */
458                  int     p0[2], p1[2];
459                  if (pipe(p0) < 0 || pipe(p1) < 0)
# Line 468 | Line 471 | ray_popen(                     /* open the specified # processes */
471                  if (r_proc[ray_pnprocs].pid < 0)
472                          error(SYSTEM, "cannot fork child process");
473                  close(p1[0]); close(p0[1]);
474 +                /*
475 +                 * Close write stream on exec to avoid multiprocessing deadlock.
476 +                 * No use in read stream without it, so set flag there as well.
477 +                 */
478 +                fcntl(p1[1], F_SETFD, FD_CLOEXEC);
479 +                fcntl(p0[0], F_SETFD, FD_CLOEXEC);
480                  r_proc[ray_pnprocs].fd_send = p1[1];
481                  r_proc[ray_pnprocs].fd_recv = p0[0];
482                  r_proc[ray_pnprocs].npending = 0;
# Line 500 | Line 509 | ray_pclose(            /* close one or more child processes */
509                  ray_pnprocs--;
510                  close(r_proc[ray_pnprocs].fd_recv);
511                  close(r_proc[ray_pnprocs].fd_send);
512 <                while (wait(&status) != r_proc[ray_pnprocs].pid)
513 <                        ;
512 >                if (waitpid(r_proc[ray_pnprocs].pid, &status, 0) < 0)
513 >                        status = 127<<8;
514                  if (status) {
515                          sprintf(errmsg,
516                                  "rendering process %d exited with code %d",
# Line 518 | Line 527 | void
527   quit(ec)                        /* make sure exit is called */
528   int     ec;
529   {
530 +        if (ray_pnprocs > 0)    /* close children if any */
531 +                ray_pclose(0);          
532          exit(ec);
533   }

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