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 holds at least RAYQLEN rays, up to |
34 |
> |
* as many rays as there are rendering processes. |
35 |
> |
* Rays are queued and returned by a single |
36 |
|
* ray_pqueue() call. A ray_pqueue() return |
37 |
|
* value of 0 indicates that no rays are ready |
38 |
|
* and the queue is not yet full. A return value of 1 |
45 |
|
* myRay.rorg = ( ray origin point ) |
46 |
|
* myRay.rdir = ( normalized ray direction ) |
47 |
|
* myRay.rmax = ( maximum length, or zero for no limit ) |
48 |
< |
* rayorigin(&myRay, NULL, PRIMARY, 1.0); |
48 |
> |
* rayorigin(&myRay, PRIMARY, NULL, NULL); |
49 |
|
* myRay.rno = ( my personal ray identifier ) |
50 |
|
* if (ray_pqueue(&myRay) == 1) |
51 |
|
* { do something with results } |
53 |
|
* Note the differences between this and the simpler ray_trace() |
54 |
|
* call. In particular, the call may or may not return a value |
55 |
|
* in the passed ray structure. Also, you need to call rayorigin() |
56 |
< |
* yourself, which is normally for you by ray_trace(). The |
57 |
< |
* great thing is that ray_pqueue() will trace rays faster in |
56 |
> |
* yourself, which is normally called for you by ray_trace(). The |
57 |
> |
* benefit is that ray_pqueue() will trace rays faster in |
58 |
|
* proportion to the number of CPUs you have available on your |
59 |
|
* system. If the ray queue is full before the call, ray_pqueue() |
60 |
|
* will block until a result is ready so it can queue this one. |
83 |
|
* ray_psend(&myRay); |
84 |
|
* } |
85 |
|
* |
86 |
< |
* The ray_presult() and/or ray_pqueue() functions may then be |
87 |
< |
* called to read back the results. |
86 |
> |
* Note that it is a fatal error to call ra_psend() when |
87 |
> |
* ray_pnidle is zero. The ray_presult() and/or ray_pqueue() |
88 |
> |
* functions may be called subsequently to read back the results. |
89 |
|
* |
90 |
|
* When you are done, you may call ray_pdone(1) to close |
91 |
|
* all child processes and clean up memory used by Radiance. |
102 |
|
* If you just want to reap children so that you can alter the |
103 |
|
* rendering parameters without reloading the scene, use the |
104 |
|
* ray_pclose(0) and ray_popen(nproc) calls to close |
105 |
< |
* then restart the child processes. |
105 |
> |
* then restart the child processes after the changes are made. |
106 |
|
* |
107 |
|
* Note: These routines are written to coordinate with the |
108 |
|
* definitions in raycalls.c, and in fact depend on them. |
109 |
|
* If you want to trace a ray and get a result synchronously, |
110 |
|
* use the ray_trace() call to compute it in the parent process. |
111 |
+ |
* This will not interfere with any subprocess calculations, |
112 |
+ |
* but beware that a fatal error may end with a call to quit(). |
113 |
|
* |
114 |
|
* Note: One of the advantages of using separate processes |
115 |
|
* is that it gives the calling program some immunity from |
116 |
|
* fatal rendering errors. As discussed in raycalls.c, |
117 |
|
* Radiance tends to throw up its hands and exit at the |
118 |
|
* first sign of trouble, calling quit() to return control |
119 |
< |
* to the system. Although you can avoid exit() with |
119 |
> |
* to the top level. Although you can avoid exit() with |
120 |
|
* your own longjmp() in quit(), the cleanup afterwards |
121 |
|
* is always suspect. Through the use of subprocesses, |
122 |
|
* we avoid this pitfall by closing the processes and |
125 |
|
* of these calls, you can assume that the processes have |
126 |
|
* been cleaned up with a call to ray_close(), though you |
127 |
|
* will have to call ray_pdone() yourself if you want to |
128 |
< |
* free memory. Obviously, you cannot continue rendering, |
129 |
< |
* but otherwise your process should not be compromised. |
128 |
> |
* free memory. Obviously, you cannot continue rendering |
129 |
> |
* without risking further errors, but otherwise your |
130 |
> |
* process should not be compromised. |
131 |
|
*/ |
132 |
|
|
133 |
|
#include <stdio.h> |
140 |
|
#include "selcall.h" |
141 |
|
|
142 |
|
#ifndef RAYQLEN |
143 |
< |
#define RAYQLEN 16 /* # rays to send at once */ |
143 |
> |
#define RAYQLEN 12 /* # rays to send at once */ |
144 |
|
#endif |
145 |
|
|
146 |
|
#ifndef MAX_RPROCS |
172 |
|
#define sendq_full() (r_send_next >= RAYQLEN) |
173 |
|
|
174 |
|
static int ray_pflush(void); |
175 |
< |
static void ray_pchild(int fd_in, int fd_out); |
175 |
> |
static void ray_pchild(int fd_in, int fd_out); |
176 |
|
|
177 |
|
|
178 |
|
extern void |
269 |
|
r_send_next++; |
270 |
|
return(rval); /* done */ |
271 |
|
} |
272 |
< |
/* add ray to send queue */ |
272 |
> |
/* else add ray to send queue */ |
273 |
|
r_queue[r_send_next] = *r; |
274 |
|
r_send_next++; |
275 |
|
/* check for returned ray... */ |
372 |
|
rp->slights = NULL; |
373 |
|
} |
374 |
|
/* return first ray received */ |
375 |
< |
*r = r_queue[r_recv_first]; |
370 |
< |
r_recv_first++; |
375 |
> |
*r = r_queue[r_recv_first++]; |
376 |
|
return(1); |
377 |
|
} |
378 |
|
|
403 |
|
/* read each ray request set */ |
404 |
|
while ((n = read(fd_in, (char *)r_queue, sizeof(r_queue))) > 0) { |
405 |
|
int n2; |
406 |
< |
if (n % sizeof(RAY)) |
406 |
> |
if (n < sizeof(RAY)) |
407 |
|
break; |
403 |
– |
n /= sizeof(RAY); |
408 |
|
/* get smuggled set length */ |
409 |
< |
n2 = r_queue[0].crtype - n; |
409 |
> |
n2 = sizeof(RAY)*r_queue[0].crtype - n; |
410 |
|
if (n2 < 0) |
411 |
|
error(INTERNAL, "buffer over-read in ray_pchild"); |
412 |
|
if (n2 > 0) { /* read the rest of the set */ |
413 |
< |
i = readbuf(fd_in, (char *)(r_queue+n), |
414 |
< |
sizeof(RAY)*n2); |
411 |
< |
if (i != sizeof(RAY)*n2) |
413 |
> |
i = readbuf(fd_in, (char *)r_queue + n, n2); |
414 |
> |
if (i != n2) |
415 |
|
break; |
416 |
|
n += n2; |
417 |
|
} |
418 |
+ |
n /= sizeof(RAY); |
419 |
|
/* evaluate rays */ |
420 |
|
for (i = 0; i < n; i++) { |
421 |
|
r_queue[i].crtype = r_queue[i].rtype; |
422 |
|
r_queue[i].parent = NULL; |
423 |
|
r_queue[i].clipset = NULL; |
424 |
|
r_queue[i].slights = NULL; |
421 |
– |
r_queue[i].revf = raytrace; |
425 |
|
samplendx++; |
426 |
|
rayclear(&r_queue[i]); |
427 |
|
rayvalue(&r_queue[i]); |
448 |
|
nadd = MAX_NPROCS - ray_pnprocs; |
449 |
|
if (nadd <= 0) |
450 |
|
return; |
451 |
< |
fflush(stderr); /* clear pending output */ |
452 |
< |
fflush(stdout); |
451 |
> |
ambsync(); /* load any new ambient values */ |
452 |
> |
fflush(NULL); /* clear pending output */ |
453 |
|
while (nadd--) { /* fork each new process */ |
454 |
|
int p0[2], p1[2]; |
455 |
|
if (pipe(p0) < 0 || pipe(p1) < 0) |
467 |
|
if (r_proc[ray_pnprocs].pid < 0) |
468 |
|
error(SYSTEM, "cannot fork child process"); |
469 |
|
close(p1[0]); close(p0[1]); |
470 |
+ |
/* |
471 |
+ |
* Close write stream on exec to avoid multiprocessing deadlock. |
472 |
+ |
* No use in read stream without it, so set flag there as well. |
473 |
+ |
*/ |
474 |
+ |
fcntl(p1[1], F_SETFD, FD_CLOEXEC); |
475 |
+ |
fcntl(p0[0], F_SETFD, FD_CLOEXEC); |
476 |
|
r_proc[ray_pnprocs].fd_send = p1[1]; |
477 |
|
r_proc[ray_pnprocs].fd_recv = p0[0]; |
478 |
|
r_proc[ray_pnprocs].npending = 0; |
505 |
|
ray_pnprocs--; |
506 |
|
close(r_proc[ray_pnprocs].fd_recv); |
507 |
|
close(r_proc[ray_pnprocs].fd_send); |
508 |
< |
while (wait(&status) != r_proc[ray_pnprocs].pid) |
509 |
< |
; |
508 |
> |
if (waitpid(r_proc[ray_pnprocs].pid, &status, 0) < 0) |
509 |
> |
status = 127<<8; |
510 |
|
if (status) { |
511 |
|
sprintf(errmsg, |
512 |
|
"rendering process %d exited with code %d", |