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 |
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 |
|
* |
131 |
|
* process should not be compromised. |
132 |
|
*/ |
133 |
|
|
131 |
– |
#include <stdio.h> |
132 |
– |
#include <sys/types.h> |
133 |
– |
#include <sys/wait.h> /* XXX platform */ |
134 |
– |
|
134 |
|
#include "rtprocess.h" |
135 |
|
#include "ray.h" |
136 |
|
#include "ambient.h" |
137 |
+ |
#include <sys/types.h> |
138 |
+ |
#include <sys/wait.h> |
139 |
|
#include "selcall.h" |
140 |
|
|
141 |
|
#ifndef RAYQLEN |
142 |
< |
#define RAYQLEN 16 /* # rays to send at once */ |
142 |
> |
#define RAYQLEN 12 /* # rays to send at once */ |
143 |
|
#endif |
144 |
|
|
145 |
|
#ifndef MAX_RPROCS |
171 |
|
#define sendq_full() (r_send_next >= RAYQLEN) |
172 |
|
|
173 |
|
static int ray_pflush(void); |
174 |
< |
static void ray_pchild(int fd_in, int fd_out); |
174 |
> |
static void ray_pchild(int fd_in, int fd_out); |
175 |
|
|
176 |
|
|
177 |
|
extern void |
244 |
|
if (sendq_full() && ray_pflush() <= 0) |
245 |
|
error(INTERNAL, "ray_pflush failed in ray_psend"); |
246 |
|
|
247 |
< |
r_queue[r_send_next] = *r; |
247 |
< |
r_send_next++; |
247 |
> |
r_queue[r_send_next++] = *r; |
248 |
|
} |
249 |
|
|
250 |
|
|
263 |
|
/* wait for a result */ |
264 |
|
rval = ray_presult(r, 0); |
265 |
|
/* put new ray in queue */ |
266 |
< |
r_queue[r_send_next] = mySend; |
267 |
< |
r_send_next++; |
266 |
> |
r_queue[r_send_next++] = mySend; |
267 |
|
return(rval); /* done */ |
268 |
|
} |
269 |
< |
/* add ray to send queue */ |
270 |
< |
r_queue[r_send_next] = *r; |
272 |
< |
r_send_next++; |
269 |
> |
/* else add ray to send queue */ |
270 |
> |
r_queue[r_send_next++] = *r; |
271 |
|
/* check for returned ray... */ |
272 |
|
if (r_recv_first >= r_recv_next) |
273 |
|
return(0); |
274 |
|
/* ...one is sitting in queue */ |
275 |
< |
*r = r_queue[r_recv_first]; |
278 |
< |
r_recv_first++; |
275 |
> |
*r = r_queue[r_recv_first++]; |
276 |
|
return(1); |
277 |
|
} |
278 |
|
|
292 |
|
return(0); |
293 |
|
/* check queued results first */ |
294 |
|
if (r_recv_first < r_recv_next) { |
295 |
< |
*r = r_queue[r_recv_first]; |
296 |
< |
r_recv_first++; |
295 |
> |
*r = r_queue[r_recv_first++]; |
296 |
> |
/* make sure send queue has room */ |
297 |
> |
if (sendq_full() && ray_pflush() <= 0) |
298 |
> |
return(-1); |
299 |
|
return(1); |
300 |
|
} |
301 |
|
n = ray_pnprocs - ray_pnidle; /* pending before flush? */ |
309 |
|
n = ray_pnprocs - ray_pnidle; |
310 |
|
if (n <= 0) /* return if nothing to await */ |
311 |
|
return(0); |
312 |
+ |
if (!poll && ray_pnprocs == 1) /* one process -> skip select() */ |
313 |
+ |
FD_SET(r_proc[0].fd_recv, &readset); |
314 |
+ |
|
315 |
|
getready: /* any children waiting for us? */ |
316 |
|
for (pn = ray_pnprocs; pn--; ) |
317 |
|
if (FD_ISSET(r_proc[pn].fd_recv, &readset) || |
372 |
|
rp->slights = NULL; |
373 |
|
} |
374 |
|
/* return first ray received */ |
375 |
< |
*r = r_queue[r_recv_first]; |
374 |
< |
r_recv_first++; |
375 |
> |
*r = r_queue[r_recv_first++]; |
376 |
|
return(1); |
377 |
|
} |
378 |
|
|
400 |
|
{ |
401 |
|
int n; |
402 |
|
register int i; |
403 |
+ |
/* flag child process for quit() */ |
404 |
+ |
ray_pnprocs = -1; |
405 |
|
/* read each ray request set */ |
406 |
|
while ((n = read(fd_in, (char *)r_queue, sizeof(r_queue))) > 0) { |
407 |
|
int n2; |
450 |
|
nadd = MAX_NPROCS - ray_pnprocs; |
451 |
|
if (nadd <= 0) |
452 |
|
return; |
453 |
< |
fflush(stderr); /* clear pending output */ |
454 |
< |
fflush(stdout); |
453 |
> |
ambsync(); /* load any new ambient values */ |
454 |
> |
fflush(NULL); /* clear pending output */ |
455 |
|
while (nadd--) { /* fork each new process */ |
456 |
|
int p0[2], p1[2]; |
457 |
|
if (pipe(p0) < 0 || pipe(p1) < 0) |
525 |
|
quit(ec) /* make sure exit is called */ |
526 |
|
int ec; |
527 |
|
{ |
528 |
+ |
if (ray_pnprocs > 0) /* close children if any */ |
529 |
+ |
ray_pclose(0); |
530 |
|
exit(ec); |
531 |
|
} |