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root/radiance/ray/src/util/rpiece.c
Revision: 2.28
Committed: Tue Oct 19 16:02:39 1993 UTC (30 years, 5 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.27: +5 -2 lines
Log Message:
fixed bug in opening non-existent sync file
added lock failure report

File Contents

# User Rev Content
1 greg 2.19 /* Copyright (c) 1993 Regents of the University of California */
2 greg 2.1
3     #ifndef lint
4     static char SCCSid[] = "$SunId$ LBL";
5     #endif
6    
7     /*
8     * Generate sections of a picture.
9     */
10    
11     #include "standard.h"
12 greg 2.16
13     #ifndef F_SETLKW
14    
15     main(argc, argv)
16     int argc;
17     char *argv[];
18     {
19     fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
20     exit(1);
21     }
22    
23     #else
24    
25 greg 2.6 #include <signal.h>
26 greg 2.1 #include "color.h"
27     #include "view.h"
28     #include "resolu.h"
29    
30 greg 2.12 #ifndef NFS
31     #define NFS 1
32     #endif
33 greg 2.9 /* set the following to 0 to forgo forking */
34     #ifndef MAXFORK
35 greg 2.12 #if NFS
36 greg 2.10 #define MAXFORK 3 /* allotment of duped processes */
37 greg 2.12 #else
38     #define MAXFORK 0
39 greg 2.9 #endif
40 greg 2.12 #endif
41 greg 2.18 /* protection from SYSV signals(!) */
42 greg 2.27 #if defined(sgi)
43 greg 2.18 #define guard_io() sighold(SIGALRM)
44     #define unguard() sigrelse(SIGALRM)
45     #endif
46     #ifndef guard_io
47     #define guard_io() 0
48     #define unguard() 0
49     #endif
50 greg 2.1 /* rpict command */
51 greg 2.23 char *rpargv[128] = {"rpict", "-S", "1"};
52     int rpargc = 3;
53 greg 2.1 int rpd[3];
54     FILE *torp, *fromrp;
55 greg 2.8 COLR *pbuf;
56 greg 2.1 /* our view parameters */
57     VIEW ourview = STDVIEW;
58 greg 2.4 double pixaspect = 1.0;
59 greg 2.23 int hres = 1024, vres = 1024, hmult = 4, vmult = 4;
60 greg 2.1 /* output file */
61     char *outfile = NULL;
62     int outfd;
63     long scanorig;
64 greg 2.25 FILE *syncfp = NULL; /* synchronization file pointer */
65     int synclst = F_UNLCK; /* synchronization file lock status */
66 greg 2.9 int nforked = 0;
67 greg 2.1
68 greg 2.25 #define sflock(t) if ((t)!=synclst) dolock(fileno(syncfp),synclst=t)
69    
70 greg 2.1 char *progname;
71     int verbose = 0;
72 greg 2.25 int rvrlim = -1;
73 greg 2.1
74     extern long lseek(), ftell();
75    
76 greg 2.6 int gotalrm = 0;
77     int onalrm() { gotalrm++; }
78 greg 2.1
79 greg 2.6
80 greg 2.1 main(argc, argv)
81     int argc;
82     char *argv[];
83     {
84     register int i, rval;
85    
86     progname = argv[0];
87     for (i = 1; i < argc; i++) {
88 greg 2.22 /* expand arguments */
89     while (rval = expandarg(&argc, &argv, i))
90     if (rval < 0) {
91     fprintf(stderr, "%s: cannot expand '%s'",
92     argv[0], argv[i]);
93     exit(1);
94     }
95 greg 2.1 if (argv[i][0] == '-')
96     switch (argv[i][1]) {
97     case 'v':
98     switch (argv[i][2]) {
99     case '\0': /* verbose option */
100     verbose = !verbose;
101     continue;
102     case 'f': /* view file */
103     if (viewfile(argv[++i], &ourview, NULL) <= 0) {
104     fprintf(stderr,
105     "%s: not a view file\n", argv[i]);
106     exit(1);
107     }
108     continue;
109     default: /* view option? */
110     rval = getviewopt(&ourview, argc-i, argv+i);
111     if (rval >= 0) {
112     i += rval;
113     continue;
114     }
115     break;
116     }
117     break;
118     case 'p': /* pixel aspect ratio? */
119 greg 2.23 if (argv[i][2] != 'a' || argv[i][3])
120     break;
121     pixaspect = atof(argv[i+1]);
122     continue;
123     case 'x': /* overall x resolution */
124     if (argv[i][2])
125     break;
126     hres = atoi(argv[++i]);
127     continue;
128     case 'y': /* overall y resolution */
129     if (argv[i][2])
130     break;
131     vres = atoi(argv[++i]);
132     continue;
133 greg 2.1 case 'X': /* horizontal multiplier */
134     if (argv[i][2])
135     break;
136     hmult = atoi(argv[++i]);
137     continue;
138     case 'Y': /* vertical multiplier */
139     if (argv[i][2])
140     break;
141     vmult = atoi(argv[++i]);
142     continue;
143 greg 2.25 case 'R': /* recover */
144     if (argv[i][2])
145     break;
146     rvrlim = 0;
147     /* fall through */
148 greg 2.5 case 'F': /* syncronization file */
149     if (argv[i][2])
150     break;
151 greg 2.28 if ((syncfp =
152     fdopen(open(argv[++i],O_RDWR|O_CREAT,0666),"r+")) == NULL) {
153 greg 2.5 fprintf(stderr, "%s: cannot open\n",
154     argv[i]);
155     exit(1);
156     }
157     continue;
158 greg 2.15 case 'z': /* z-file ist verbotten */
159     fprintf(stderr, "%s: -z option not allowed\n",
160     argv[0]);
161     exit(1);
162 greg 2.1 case 'o': /* output file */
163     if (argv[i][2])
164     break;
165     outfile = argv[++i];
166     continue;
167 greg 2.23 } else if (i >= argc-1)
168     break;
169 greg 2.1 rpargv[rpargc++] = argv[i];
170     }
171 greg 2.23 if (i >= argc) {
172     fprintf(stderr, "%s: missing octree argument\n", argv[0]);
173     exit(1);
174     }
175 greg 2.1 if (outfile == NULL) {
176     fprintf(stderr, "%s: missing output file\n", argv[0]);
177     exit(1);
178     }
179     init(argc, argv);
180     rpiece();
181 greg 2.15 exit(cleanup(0));
182 greg 2.1 }
183    
184    
185 greg 2.25 dolock(fd, ltyp) /* lock or unlock a file */
186     int fd;
187     int ltyp;
188     {
189     static struct flock fls; /* static so initialized to zeroes */
190 greg 2.28 extern char *sys_errlist[];
191 greg 2.25
192     fls.l_type = ltyp;
193     if (fcntl(fd, F_SETLKW, &fls) < 0) {
194 greg 2.28 fprintf(stderr, "%s: cannot lock/unlock file: %s\n",
195     progname, sys_errlist[errno]);
196 greg 2.25 exit(1);
197     }
198     }
199    
200    
201 greg 2.1 init(ac, av) /* set up output file and start rpict */
202     int ac;
203     char **av;
204     {
205 greg 2.23 static char hrbuf[16], vrbuf[16];
206 greg 2.2 extern char VersionID[];
207 greg 2.1 char *err;
208     FILE *fp;
209     int hr, vr;
210     /* set up view */
211     if ((err = setview(&ourview)) != NULL) {
212     fprintf(stderr, "%s: %s\n", progname, err);
213     exit(1);
214     }
215 greg 2.25 if (syncfp != NULL) {
216     sflock(F_RDLCK);
217     fscanf(syncfp, "%d %d", &hmult, &vmult);
218     sflock(F_UNLCK);
219 greg 2.5 }
220 greg 2.23 /* compute piece size */
221     hres /= hmult;
222     vres /= vmult;
223 greg 2.1 normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
224 greg 2.23 sprintf(hrbuf, "%d", hres);
225     rpargv[rpargc++] = "-x"; rpargv[rpargc++] = hrbuf;
226     sprintf(vrbuf, "%d", vres);
227     rpargv[rpargc++] = "-y"; rpargv[rpargc++] = vrbuf;
228     rpargv[rpargc++] = "-pa"; rpargv[rpargc++] = "0";
229     rpargv[rpargc++] = av[ac-1];
230     rpargv[rpargc] = NULL;
231 greg 2.1 /* open output file */
232     if ((outfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0666)) >= 0) {
233 greg 2.25 dolock(outfd, F_WRLCK);
234 greg 2.1 if ((fp = fdopen(dup(outfd), "w")) == NULL)
235     goto filerr;
236     printargs(ac, av, fp); /* write header */
237 greg 2.2 fprintf(fp, "SOFTWARE= %s\n", VersionID);
238 greg 2.1 fputs(VIEWSTR, fp);
239     fprintview(&ourview, fp);
240     putc('\n', fp);
241     if (pixaspect < .99 || pixaspect > 1.01)
242     fputaspect(pixaspect, fp);
243     fputformat(COLRFMT, fp);
244     putc('\n', fp);
245     fprtresolu(hres*hmult, vres*vmult, fp);
246     } else if ((outfd = open(outfile, O_RDWR)) >= 0) {
247 greg 2.25 dolock(outfd, F_RDLCK);
248 greg 2.1 if ((fp = fdopen(dup(outfd), "r+")) == NULL)
249     goto filerr;
250 greg 2.13 getheader(fp, NULL, NULL); /* skip header */
251 greg 2.15 if (!fscnresolu(&hr, &vr, fp) || /* check resolution */
252 greg 2.1 hr != hres*hmult || vr != vres*vmult) {
253 greg 2.8 fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
254     progname, outfile);
255 greg 2.1 exit(1);
256     }
257     } else {
258 greg 2.8 fprintf(stderr, "%s: cannot open file \"%s\"\n",
259     progname, outfile);
260 greg 2.1 exit(1);
261     }
262     scanorig = ftell(fp); /* record position of first scanline */
263     if (fclose(fp) == -1) /* done with stream i/o */
264     goto filerr;
265 greg 2.25 dolock(outfd, F_UNLCK);
266 greg 2.1 /* start rpict process */
267     if (open_process(rpd, rpargv) <= 0) {
268 greg 2.3 fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
269 greg 2.1 exit(1);
270     }
271     if ((fromrp = fdopen(rpd[0], "r")) == NULL ||
272     (torp = fdopen(rpd[1], "w")) == NULL) {
273     fprintf(stderr, "%s: cannot open stream to %s\n",
274     progname, rpargv[0]);
275     exit(1);
276     }
277 greg 2.23 if ((pbuf = (COLR *)bmalloc(hres*vres*sizeof(COLR))) == NULL) {
278 greg 2.1 fprintf(stderr, "%s: out of memory\n", progname);
279     exit(1);
280     }
281 greg 2.6 signal(SIGALRM, onalrm);
282 greg 2.1 return;
283     filerr:
284 greg 2.8 fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
285 greg 2.1 exit(1);
286     }
287    
288    
289     int
290 greg 2.5 nextpiece(xp, yp) /* get next piece assignment */
291     int *xp, *yp;
292     {
293 greg 2.6 if (gotalrm) /* someone wants us to quit */
294     return(0);
295 greg 2.25 if (syncfp != NULL) { /* use sync file */
296     /*
297     * So we don't necessarily have to lock and unlock the file
298     * multiple times (very slow), we establish an exclusive
299     * lock at the beginning on our synchronization file and
300     * maintain it in the subroutine rvrpiece().
301     */
302     sflock(F_WRLCK);
303     fseek(syncfp, 0L, 0); /* read position */
304     if (fscanf(syncfp, "%*d %*d %d %d", xp, yp) < 2) {
305 greg 2.8 *xp = hmult-1;
306     *yp = vmult;
307     }
308 greg 2.25 if (rvrlim == 0) /* initialize recovery limit */
309     rvrlim = *xp*vmult + *yp;
310     if (rvrpiece(xp, yp)) { /* do stragglers first */
311     sflock(F_UNLCK);
312     return(1);
313     }
314 greg 2.8 if (--(*yp) < 0) { /* decrement position */
315 greg 2.5 *yp = vmult-1;
316 greg 2.25 if (--(*xp) < 0) { /* all done */
317     sflock(F_UNLCK);
318 greg 2.5 return(0);
319     }
320     }
321 greg 2.25 fseek(syncfp, 0L, 0); /* write new position */
322     fprintf(syncfp, "%4d %4d\n%4d %4d\n\n", hmult, vmult, *xp, *yp);
323     fflush(syncfp);
324     sflock(F_UNLCK); /* release sync file */
325 greg 2.5 return(1);
326     }
327 greg 2.26 return(scanf("%d %d", xp, yp) == 2); /* use stdin */
328 greg 2.5 }
329    
330    
331     int
332 greg 2.25 rvrpiece(xp, yp) /* check for recoverable pieces */
333     register int *xp, *yp;
334     {
335     static char *pdone = NULL; /* which pieces are done */
336     static long readpos = -1; /* how far we've read */
337     register int i;
338     /*
339     * This routine is called by nextpiece() with an
340     * exclusive lock on syncfp and the file pointer at the
341     * appropriate position to read in the finished pieces.
342     */
343     if (rvrlim < 0)
344     return(0); /* only check if asked */
345     if (pdone == NULL) /* first call */
346     pdone = calloc(hmult*vmult, sizeof(char));
347     if (readpos != -1) /* mark what's been done */
348     fseek(syncfp, readpos, 0);
349     while (fscanf(syncfp, "%d %d", xp, yp) == 2)
350     pdone[*xp*vmult+*yp] = 1;
351     if (!feof(syncfp)) {
352     fprintf(stderr, "%s: format error in sync file\n", progname);
353     exit(1);
354     }
355     readpos = ftell(syncfp);
356     i = hmult*vmult; /* find an unaccounted for piece */
357     while (i-- > rvrlim)
358     if (!pdone[i]) {
359     *xp = i / vmult;
360     *yp = i % vmult;
361     pdone[i] = 1; /* consider it done */
362     return(1);
363     }
364     rvrlim = -1; /* nothing left to recover */
365     free(pdone);
366     pdone = NULL;
367     return(0);
368     }
369    
370    
371     int
372 greg 2.10 cleanup(rstat) /* close rpict process and clean up */
373     int rstat;
374 greg 2.1 {
375 greg 2.10 int status;
376 greg 2.1
377 greg 2.23 bfree((char *)pbuf, hres*vres*sizeof(COLR));
378 greg 2.1 fclose(torp);
379     fclose(fromrp);
380 greg 2.10 while (wait(&status) != -1)
381 greg 2.9 if (rstat == 0)
382     rstat = status>>8 & 0xff;
383     return(rstat);
384 greg 2.1 }
385    
386    
387     rpiece() /* render picture piece by piece */
388     {
389     VIEW pview;
390     int xorg, yorg;
391 greg 2.11 /* compute view parameters */
392     copystruct(&pview, &ourview);
393     switch (ourview.type) {
394     case VT_PER:
395     pview.horiz = 2.*180./PI*atan(
396     tan(PI/180./2.*ourview.horiz)/hmult );
397     pview.vert = 2.*180./PI*atan(
398     tan(PI/180./2.*ourview.vert)/vmult );
399     break;
400     case VT_PAR:
401     case VT_ANG:
402     pview.horiz = ourview.horiz / hmult;
403     pview.vert = ourview.vert / vmult;
404     break;
405     case VT_HEM:
406     pview.horiz = 2.*180./PI*asin(
407     sin(PI/180./2.*ourview.horiz)/hmult );
408     pview.vert = 2.*180./PI*asin(
409     sin(PI/180./2.*ourview.vert)/vmult );
410     break;
411     default:
412     fprintf(stderr, "%s: unknown view type '-vt%c'\n",
413     progname, ourview.type);
414     exit(cleanup(1));
415     }
416     /* render each piece */
417 greg 2.5 while (nextpiece(&xorg, &yorg)) {
418 greg 2.11 pview.hoff = ourview.hoff + xorg - 0.5*(hmult-1);
419     pview.voff = ourview.voff + yorg - 0.5*(vmult-1);
420 greg 2.1 fputs(VIEWSTR, torp);
421     fprintview(&pview, torp);
422     putc('\n', torp);
423 greg 2.11 fflush(torp); /* assigns piece to rpict */
424 greg 2.1 putpiece(xorg, yorg); /* place piece in output */
425     }
426     }
427    
428    
429 greg 2.9 int
430 greg 2.1 putpiece(xpos, ypos) /* get next piece from rpict */
431     int xpos, ypos;
432     {
433 greg 2.7 struct flock fls;
434 greg 2.9 int pid, status;
435 greg 2.1 int hr, vr;
436 greg 2.8 register int y;
437     /* check bounds */
438 greg 2.5 if (xpos < 0 | ypos < 0 | xpos >= hmult | ypos >= vmult) {
439     fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
440     progname, xpos, ypos);
441 greg 2.10 exit(cleanup(1));
442 greg 2.5 }
443 greg 2.8 /* check header from rpict */
444 greg 2.18 guard_io();
445 greg 2.13 getheader(fromrp, NULL, NULL);
446 greg 2.15 if (!fscnresolu(&hr, &vr, fromrp) || hr != hres | vr != vres) {
447 greg 2.3 fprintf(stderr, "%s: resolution mismatch from %s\n",
448     progname, rpargv[0]);
449 greg 2.10 exit(cleanup(1));
450 greg 2.1 }
451 greg 2.24 if (verbose) { /* notify caller */
452     printf("%d %d begun\n", xpos, ypos);
453     fflush(stdout);
454     }
455 greg 2.18 unguard();
456 greg 2.8 /* load new piece into buffer */
457 greg 2.18 for (y = 0; y < vr; y++) {
458     guard_io();
459 greg 2.8 if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
460 greg 2.3 fprintf(stderr, "%s: read error from %s\n",
461     progname, rpargv[0]);
462 greg 2.10 exit(cleanup(1));
463 greg 2.1 }
464 greg 2.18 unguard();
465     }
466 greg 2.9 #if MAXFORK
467     /* fork so we don't slow rpict down */
468     if ((pid = fork()) > 0) {
469 greg 2.10 if (++nforked >= MAXFORK) {
470 greg 2.9 wait(&status); /* reap a child */
471     if (status)
472 greg 2.10 exit(cleanup(status>>8 & 0xff));
473 greg 2.9 nforked--;
474     }
475     return(pid);
476     }
477     #else
478     pid = -1; /* no forking */
479     #endif
480 greg 2.19 fls.l_start = scanorig +
481     ((long)(vmult-1-ypos)*vres*hmult+xpos)*hres*sizeof(COLR);
482 greg 2.12 #if NFS
483 greg 2.19 fls.l_len = ((long)(vres-1)*hmult+1)*hres*sizeof(COLR);
484 greg 2.8 /* lock file section so NFS doesn't mess up */
485     fls.l_whence = 0;
486     fls.l_type = F_WRLCK;
487 greg 2.26 if (fcntl(outfd, F_SETLKW, &fls) < 0)
488     filerr("lock");
489 greg 2.12 #endif
490 greg 2.8 /* write new piece to file */
491 greg 2.19 if (lseek(outfd, fls.l_start, 0) == -1)
492 greg 2.26 filerr("seek");
493 greg 2.9 if (hmult == 1) {
494     if (writebuf(outfd, (char *)pbuf,
495     vr*hr*sizeof(COLR)) != vr*hr*sizeof(COLR))
496 greg 2.26 filerr("write");
497 greg 2.9 } else
498     for (y = 0; y < vr; y++) {
499     if (writebuf(outfd, (char *)(pbuf+y*hr),
500     hr*sizeof(COLR)) != hr*sizeof(COLR))
501 greg 2.26 filerr("write");
502 greg 2.9 if (y < vr-1 && lseek(outfd,
503     (long)(hmult-1)*hr*sizeof(COLR),
504     1) == -1)
505 greg 2.26 filerr("seek");
506 greg 2.1 }
507 greg 2.25 #if NFS
508     fls.l_type = F_UNLCK; /* release lock */
509 greg 2.26 if (fcntl(outfd, F_SETLKW, &fls) < 0)
510     filerr("lock");
511 greg 2.25 #endif
512     if (syncfp != NULL) { /* record what's been done */
513     sflock(F_WRLCK);
514     fseek(syncfp, 0L, 2); /* append index */
515     fprintf(syncfp, "%4d %4d\n", xpos, ypos);
516     fflush(syncfp);
517     /*** Unlock not necessary, since
518     sflock(F_UNLCK); _exit() or nextpiece() is next ***/
519     }
520 greg 2.20 if (verbose) { /* notify caller */
521     printf("%d %d done\n", xpos, ypos);
522     fflush(stdout);
523     }
524 greg 2.25 if (pid == -1) /* didn't fork or fork failed */
525 greg 2.9 return(0);
526 greg 2.25 _exit(0); /* else exit child process (releasing locks) */
527 greg 2.26 }
528    
529    
530     filerr(t) /* report file error and exit */
531     char *t;
532     {
533     extern char *sys_errlist[];
534    
535     fprintf(stderr, "%s: %s error on file \"%s\": %s\n",
536     progname, t, outfile, sys_errlist[errno]);
537 greg 2.9 _exit(1);
538 greg 2.1 }
539 greg 2.16
540     #endif